[ONOS-4350] Inter file linking implementation and inter-jar linking framework

Change-Id: I71a26ba3e0b9d17261e78a9313fe7f047195932e

-/*
- * Copyright 2016-present Open Networking Laboratory
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package org.onosproject.yangutils.datamodel;
-
-/**
- * Represents ENUM to identify the YANG resolution type.
- */
-public enum ResolutionType {
-    /**
-     * Identifies that resolution is for typedef.
-     */
-    TYPEDEF_RESOLUTION,
-
-    /**
-     * Identifies that resolution is for grouping.
-     */
-    GROUPING_RESOLUTION
-}

@@ -15,10 +15,14 @@
  */
 package org.onosproject.yangutils.datamodel;
 
+import java.util.Set;
 import org.onosproject.yangutils.datamodel.exceptions.DataModelException;
 import org.onosproject.yangutils.parser.Parsable;
+import org.onosproject.yangutils.plugin.manager.YangFileInfo;
 import org.onosproject.yangutils.utils.YangConstructType;
 
+import static org.onosproject.yangutils.datamodel.utils.DataModelUtils.findReferredNode;
+
 /*-
  *   Reference 6020.
  *
@@ -46,7 +50,7 @@ import org.onosproject.yangutils.utils.YangConstructType;
 /**
  * Represents the belongs-to data type information.
  */
-public class YangBelongsTo implements Parsable {
+public class YangBelongsTo implements Parsable, LocationInfo {
 
     /**
      * Reference RFC 6020.
@@ -70,6 +74,12 @@ public class YangBelongsTo implements Parsable {
      */
     private String prefix;
 
+    // Error Line number.
+    private int lineNumber;
+
+    // Error character position.
+    private int charPosition;
+
     /**
      * Create a belongs to object.
      */
@@ -90,7 +100,6 @@ public class YangBelongsTo implements Parsable {
      * Sets the belongs to module name.
      *
      * @param belongsToModuleName the belongs to module name to set
-     *
      */
     public void setBelongsToModuleName(String belongsToModuleName) {
         this.belongsToModuleName = belongsToModuleName;
@@ -161,4 +170,47 @@ public class YangBelongsTo implements Parsable {
     public void validateDataOnExit() throws DataModelException {
         // TODO auto-generated method stub, to be implemented by parser
     }
+
+    @Override
+    public int getLineNumber() {
+        return lineNumber;
+    }
+
+    @Override
+    public int getCharPosition() {
+        return charPosition;
+    }
+
+    @Override
+    public void setLineNumber(int lineNumber) {
+        this.lineNumber = lineNumber;
+    }
+
+    @Override
+    public void setCharPosition(int charPositionInLine) {
+        this.charPosition = charPositionInLine;
+    }
+
+    /**
+     * Links the belongs to with a module.
+     *
+     * @param yangFileInfoSet YANG file information set
+     * @throws DataModelException a violation in data model rule
+     */
+    public void linkWithModule(Set<YangFileInfo> yangFileInfoSet)
+            throws DataModelException {
+        String belongsToModuleName = getBelongsToModuleName();
+        YangNode moduleNode = findReferredNode(yangFileInfoSet, belongsToModuleName);
+        if (moduleNode != null) {
+            if (moduleNode instanceof YangModule) {
+                setModuleNode(moduleNode);
+                return;
+            }
+        }
+        DataModelException exception = new DataModelException("YANG file error : Module " + belongsToModuleName +
+                "to which sub-module belongs to is not found.");
+        exception.setLine(getLineNumber());
+        exception.setCharPosition(getCharPosition());
+        throw exception;
+    }
 }

@@ -17,10 +17,10 @@
 package org.onosproject.yangutils.datamodel;
 
 import org.onosproject.yangutils.datamodel.exceptions.DataModelException;
+import org.onosproject.yangutils.linker.impl.ResolvableStatus;
 import com.google.common.base.Strings;
 
-import static org.onosproject.yangutils.datamodel.ResolvableStatus.INTRA_FILE_RESOLVED;
-import static org.onosproject.yangutils.datamodel.ResolvableStatus.RESOLVED;
+import static org.onosproject.yangutils.datamodel.YangDataTypes.BINARY;
 import static org.onosproject.yangutils.datamodel.YangDataTypes.BITS;
 import static org.onosproject.yangutils.datamodel.YangDataTypes.BOOLEAN;
 import static org.onosproject.yangutils.datamodel.YangDataTypes.DERIVED;
@@ -30,6 +30,8 @@ import static org.onosproject.yangutils.datamodel.YangDataTypes.IDENTITYREF;
 import static org.onosproject.yangutils.datamodel.YangDataTypes.LEAFREF;
 import static org.onosproject.yangutils.datamodel.YangDataTypes.STRING;
 import static org.onosproject.yangutils.datamodel.YangDataTypes.UNION;
+import static org.onosproject.yangutils.linker.impl.ResolvableStatus.INTRA_FILE_RESOLVED;
+import static org.onosproject.yangutils.linker.impl.ResolvableStatus.RESOLVED;
 import static org.onosproject.yangutils.utils.RestrictionResolver.isOfRangeRestrictedType;
 import static org.onosproject.yangutils.utils.RestrictionResolver.processLengthRestriction;
 import static org.onosproject.yangutils.utils.RestrictionResolver.processRangeRestriction;
@@ -236,7 +238,7 @@ public class YangDerivedInfo<T> implements LocationInfo {
              * Check whether the referred typedef is resolved.
              */
             if (baseType.getResolvableStatus() != INTRA_FILE_RESOLVED && baseType.getResolvableStatus() != RESOLVED) {
-                throw new DataModelException("Linker Error: Referred typedef is not resolved.");
+                throw new DataModelException("Linker Error: Referred typedef is not resolved for type.");
             }
 
             /*
@@ -301,6 +303,28 @@ public class YangDerivedInfo<T> implements LocationInfo {
                      */
                     return RESOLVED;
                 }
+            } else if (getEffectiveBuiltInType() == BINARY) {
+                if (refDerivedInfo.getResolvedExtendedInfo() == null) {
+                    resolveLengthRestriction(null);
+                    /*
+                     * Return the resolution status as resolved, if it's not
+                     * resolve length restriction will throw exception
+                     * in previous function.
+                     */
+                    return RESOLVED;
+                } else {
+                    if (!(refDerivedInfo.getResolvedExtendedInfo() instanceof YangRangeRestriction)) {
+                        throw new DataModelException("Linker error: Referred typedef restriction info is of invalid " +
+                                "type.");
+                    }
+                    resolveLengthRestriction((YangRangeRestriction) refDerivedInfo.getResolvedExtendedInfo());
+                    /*
+                     * Return the resolution status as resolved, if it's not
+                     * resolve length restriction will throw exception
+                     * in previous function.
+                     */
+                    return RESOLVED;
+                }
             }
         } else {
             setEffectiveBuiltInType((baseType.getDataType()));
@@ -356,6 +380,28 @@ public class YangDerivedInfo<T> implements LocationInfo {
                      */
                     return RESOLVED;
                 }
+            } else if (getEffectiveBuiltInType() == BINARY) {
+                if (baseType.getDataTypeExtendedInfo() == null) {
+                    resolveLengthRestriction(null);
+                    /*
+                     * Return the resolution status as resolved, if it's not
+                     * resolve length restriction will throw exception
+                     * in previous function.
+                     */
+                    return RESOLVED;
+                } else {
+                    if (!(baseType.getDataTypeExtendedInfo() instanceof YangRangeRestriction)) {
+                        throw new DataModelException("Linker error: Referred typedef restriction info is of invalid " +
+                                "type.");
+                    }
+                    resolveLengthRestriction((YangRangeRestriction) baseType.getDataTypeExtendedInfo());
+                    /*
+                     * Return the resolution status as resolved, if it's not
+                     * resolve length restriction will throw exception
+                     * in previous function.
+                     */
+                    return RESOLVED;
+                }
             }
         }
 

@@ -15,10 +15,14 @@
  */
 package org.onosproject.yangutils.datamodel;
 
+import java.util.Set;
 import org.onosproject.yangutils.datamodel.exceptions.DataModelException;
 import org.onosproject.yangutils.parser.Parsable;
+import org.onosproject.yangutils.plugin.manager.YangFileInfo;
 import org.onosproject.yangutils.utils.YangConstructType;
 
+import static org.onosproject.yangutils.datamodel.utils.DataModelUtils.findReferredNode;
+
 /*
  *  Reference:RFC 6020.
  *  The "import" statement makes definitions from one module available
@@ -64,7 +68,7 @@ import org.onosproject.yangutils.utils.YangConstructType;
  * Represents the information about the imported modules.
  */
 public class YangImport
-        implements Parsable {
+        implements Parsable, LocationInfo {
 
     /**
      * Name of the module that is being imported.
@@ -78,7 +82,7 @@ public class YangImport
 
     /**
      * Reference:RFC 6020.
-     *
+     * <p>
      * The import's "revision-date" statement is used to specify the exact
      * version of the module to import. The "revision-date" statement MUST match
      * the most recent "revision" statement in the imported module. organization
@@ -87,10 +91,20 @@ public class YangImport
     private String revision;
 
     /**
+     * Reference to node which is imported.
+     */
+    private YangNode importedNode;
+
+    // Error Line number.
+    private int lineNumber;
+
+    // Error character position.
+    private int charPosition;
+
+    /**
      * Creates a YANG import.
      */
     public YangImport() {
-
     }
 
     /**
@@ -181,4 +195,91 @@ public class YangImport
         // TODO auto-generated method stub, to be implemented by parser
 
     }
+
+    /**
+     * Returns imported node.
+     *
+     * @return imported node
+     */
+    public YangNode getImportedNode() {
+        return importedNode;
+    }
+
+    /**
+     * Sets imported node.
+     *
+     * @param importedNode imported node
+     */
+    public void setImportedNode(YangNode importedNode) {
+        this.importedNode = importedNode;
+    }
+
+    @Override
+    public int getLineNumber() {
+        return lineNumber;
+    }
+
+    @Override
+    public int getCharPosition() {
+        return charPosition;
+    }
+
+    @Override
+    public void setLineNumber(int lineNumber) {
+        this.lineNumber = lineNumber;
+    }
+
+    @Override
+    public void setCharPosition(int charPositionInLine) {
+        this.charPosition = charPositionInLine;
+    }
+
+    /**
+     * Adds reference to an import.
+     *
+     * @param yangFileInfoSet YANG file info set
+     * @throws DataModelException a violation of data model rules
+     */
+    public void addReferenceToImport(Set<YangFileInfo> yangFileInfoSet) throws DataModelException {
+        String importedModuleName = getModuleName();
+        String importedModuleRevision = getRevision();
+        YangNode moduleNode = null;
+        /*
+         * Find the imported module node for a given module name
+         * with a specified revision if revision is not null.
+         */
+        if (importedModuleRevision != null) {
+            String importedModuleNameWithRevision = importedModuleName + "@" + importedModuleRevision;
+            moduleNode = findReferredNode(yangFileInfoSet, importedModuleNameWithRevision);
+        }
+
+        /*
+         * Find the imported module node for a given module name
+         * without revision if can't find with revision.
+         */
+        if (moduleNode == null) {
+            moduleNode = findReferredNode(yangFileInfoSet, importedModuleName);
+        }
+
+        if (moduleNode != null) {
+            if (moduleNode instanceof YangModule) {
+                if (getRevision() == null || getRevision().isEmpty()) {
+                    setImportedNode(moduleNode);
+                    return;
+                }
+                // Match revision if import is with revision.
+                if (((YangModule) moduleNode).getRevision().getRevDate().equals(importedModuleRevision)) {
+                    setImportedNode(moduleNode);
+                    return;
+                }
+            }
+        }
+
+        // Exception if there is no match.
+        DataModelException exception = new DataModelException("YANG file error : Imported module "
+                + importedModuleName + " with revision " + importedModuleRevision + " is not found.");
+        exception.setLine(getLineNumber());
+        exception.setCharPosition(getCharPosition());
+        throw exception;
+    }
 }

@@ -15,10 +15,14 @@
  */
 package org.onosproject.yangutils.datamodel;
 
+import java.util.Set;
 import org.onosproject.yangutils.datamodel.exceptions.DataModelException;
 import org.onosproject.yangutils.parser.Parsable;
+import org.onosproject.yangutils.plugin.manager.YangFileInfo;
 import org.onosproject.yangutils.utils.YangConstructType;
 
+import static org.onosproject.yangutils.datamodel.utils.DataModelUtils.findReferredNode;
+
 /*
  * Reference:RFC 6020.
  * The "include" statement is used to make content from a submodule
@@ -38,7 +42,7 @@ import org.onosproject.yangutils.utils.YangConstructType;
  * Represents the information about the included sub-modules.
  */
 public class YangInclude
-        implements Parsable {
+        implements Parsable, LocationInfo {
 
     /**
      * Name of the sub-module that is being included.
@@ -52,6 +56,17 @@ public class YangInclude
     private String revision;
 
     /**
+     * Reference to node which is included.
+     */
+    private YangNode includedNode;
+
+    // Error Line number.
+    private int lineNumber;
+
+    // Error character position.
+    private int charPosition;
+
+    /**
      * Creates a YANG include.
      */
     public YangInclude() {
@@ -127,4 +142,98 @@ public class YangInclude
 
     }
 
+    public YangNode getIncludedNode() {
+        return includedNode;
+    }
+
+    public void setIncludedNode(YangNode includedNode) {
+        this.includedNode = includedNode;
+    }
+
+    @Override
+    public int getLineNumber() {
+        return lineNumber;
+    }
+
+    @Override
+    public int getCharPosition() {
+        return charPosition;
+    }
+
+    @Override
+    public void setLineNumber(int lineNumber) {
+        this.lineNumber = lineNumber;
+    }
+
+    @Override
+    public void setCharPosition(int charPositionInLine) {
+        this.charPosition = charPositionInLine;
+    }
+
+    /**
+     * Adds reference to an include.
+     *
+     * @param yangFileInfoSet YANG file info set
+     * @return YANG sub module node
+     * @throws DataModelException a violation of data model rules
+     */
+    public YangSubModule addReferenceToInclude(Set<YangFileInfo> yangFileInfoSet) throws DataModelException {
+        String includedSubModuleName = getSubModuleName();
+        String includedSubModuleRevision = getRevision();
+        YangNode subModuleNode = null;
+
+        /*
+         * Find the included sub-module node for a given module name
+         * with a specified revision if revision is not null.
+         */
+        if (includedSubModuleRevision != null) {
+            String includedSubModuleNameWithRevision = includedSubModuleName + "@" + includedSubModuleRevision;
+            subModuleNode = findReferredNode(yangFileInfoSet, includedSubModuleNameWithRevision);
+        }
+
+        /*
+         * Find the imported sub module node for a given module name
+         * without revision if can't find with revision.
+         */
+        if (subModuleNode == null) {
+            subModuleNode = findReferredNode(yangFileInfoSet, includedSubModuleName);
+        }
+
+        if (subModuleNode != null) {
+            if (subModuleNode instanceof YangSubModule) {
+                if (getRevision() == null || getRevision().isEmpty()) {
+                    setIncludedNode(subModuleNode);
+                    return (YangSubModule) subModuleNode;
+                }
+                // Match revision if inclusion is with revision.
+                if (((YangSubModule) subModuleNode).getRevision().getRevDate().equals(includedSubModuleRevision)) {
+                    setIncludedNode(subModuleNode);
+                    return (YangSubModule) subModuleNode;
+                }
+            }
+        }
+        // Exception if there is no match.
+        DataModelException exception = new DataModelException("YANG file error : Included sub module " +
+                includedSubModuleName + "with a given revision is not found.");
+        exception.setLine(getLineNumber());
+        exception.setCharPosition(getCharPosition());
+        throw exception;
+    }
+
+    /**
+     * Reports an error when included sub-module doesn't meet condition that
+     * "included sub-modules should belong module, as defined by the
+     * "belongs-to" statement or sub-modules are only allowed to include other
+     * sub-modules belonging to the same module.
+     *
+     * @throws DataModelException a violation in data model rule
+     */
+    public void reportIncludeError() throws DataModelException {
+        DataModelException exception = new DataModelException("YANG file error : Included sub-module " +
+                getSubModuleName() + "doesn't belongs to parent module also it doesn't belongs" +
+                "to sub-module belonging to the same parent module.");
+        exception.setLine(getLineNumber());
+        exception.setCharPosition(getCharPosition());
+        throw exception;
+    }
 }

+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.datamodel;
+
+/*-
+ * Reference RFC 6020.
+ *
+ * Binary can be restricted with "length" statements alone.
+ *
+ */
+
+import org.onosproject.yangutils.datamodel.exceptions.DataModelException;
+import org.onosproject.yangutils.parser.Parsable;
+import org.onosproject.yangutils.utils.YangConstructType;
+import org.onosproject.yangutils.utils.builtindatatype.YangUint64;
+
+/**
+ * Represents the restriction for length data type.
+ */
+public class YangLengthRestriction implements YangDesc, YangReference, YangAppErrorInfo, Parsable {
+
+    /*-
+     * Reference RFC 6020.
+     * The length Statement
+     *
+     * The "length" statement, which is an optional sub-statement to the
+     * "type" statement, takes as an argument a length expression string.
+     * It is used to restrict the built-in type "string", or types derived
+     * from "string".
+     * A "length" statement restricts the number of unicode characters in
+     * the string.
+     * A length range consists of an explicit value, or a lower bound, two
+     * consecutive dots "..", and an upper bound.  Multiple values or ranges
+     * can be given, separated by "|".  Length-restricting values MUST NOT
+     * be negative.  If multiple values or ranges are given, they all MUST
+     * be disjoint and MUST be in ascending order.  If a length restriction
+     * is applied to an already length-restricted type, the new restriction
+     * MUST be equal or more limiting, that is, raising the lower bounds,
+     * reducing the upper bounds, removing explicit length values or ranges,
+     * or splitting ranges into multiple ranges with intermediate gaps.  A
+     * length value is a non-negative integer, or one of the special values
+     * "min" or "max". "min" and "max" mean the minimum and maximum length
+     * accepted for the type being restricted, respectively.  An
+     * implementation is not required to support a length value larger than
+     * 18446744073709551615.
+     * The length's sub-statements
+     *
+     *  +---------------+---------+-------------+-----------------+
+     *  | substatement  | section | cardinality | mapped data type|
+     *  +---------------+---------+-------------+-----------------+
+     *  | description   | 7.19.3  | 0..1        | string          |
+     *  | error-app-tag | 7.5.4.2 | 0..1        | string          |
+     *  | error-message | 7.5.4.1 | 0..1        | string          |
+     *  | reference     | 7.19.4  | 0..1        | string          |
+     *  +---------------+---------+-------------+-----------------+
+     */
+
+    /**
+     * Length restriction information.
+     */
+    private YangRangeRestriction<YangUint64> lengthRestriction;
+
+    /**
+     * Textual reference.
+     */
+    private String reference;
+
+    /**
+     * Application's error message, to be used for data error.
+     */
+    private String errorMessage;
+
+    /**
+     * Application's error tag, to be filled in data validation error response.
+     */
+    private String errorAppTag;
+
+    /**
+     * Textual description.
+     */
+    private String description;
+
+    /**
+     * Creates a YANG length restriction object.
+     */
+    public YangLengthRestriction() {
+    }
+
+    /**
+     * Returns the length restriction on the string data.
+     *
+     * @return length restriction on the string data
+     */
+    public YangRangeRestriction<YangUint64> getLengthRestriction() {
+        return lengthRestriction;
+    }
+
+    /**
+     * Sets the length restriction on the string data.
+     *
+     * @param lengthRestriction length restriction on the string data
+     */
+    public void setLengthRestriction(YangRangeRestriction<YangUint64> lengthRestriction) {
+        this.lengthRestriction = lengthRestriction;
+    }
+
+    /**
+     * Returns the textual reference of the length restriction.
+     *
+     * @return textual reference of the length restriction
+     */
+    @Override
+    public String getReference() {
+        return reference;
+    }
+
+    /**
+     * Sets the textual reference of the length restriction.
+     *
+     * @param ref textual reference of the length restriction
+     */
+    @Override
+    public void setReference(String ref) {
+        reference = ref;
+    }
+
+    /**
+     * Returns the description of the length restriction.
+     *
+     * @return description of the length restriction
+     */
+    @Override
+    public String getDescription() {
+        return description;
+    }
+
+    /**
+     * Sets the description of the length restriction.
+     *
+     * @param desc description of the length restriction
+     */
+    @Override
+    public void setDescription(String desc) {
+        description = desc;
+
+    }
+
+    /**
+     * Returns application's error message, to be used for data error.
+     *
+     * @return Application's error message, to be used for data error
+     */
+    @Override
+    public String getGetErrorMessage() {
+        return errorMessage;
+    }
+
+    /**
+     * Sets Application's error message, to be used for data error.
+     *
+     * @param errMsg Application's error message, to be used for data error
+     */
+    @Override
+    public void setErrorMessage(String errMsg) {
+        errorMessage = errMsg;
+
+    }
+
+    /**
+     * Returns application's error tag, to be used for data error.
+     *
+     * @return application's error tag, to be used for data error
+     */
+    @Override
+    public String getGetErrorAppTag() {
+        return errorAppTag;
+    }
+
+    /**
+     * Sets application's error tag, to be used for data error.
+     *
+     * @param errTag application's error tag, to be used for data error.
+     */
+    @Override
+    public void setErrorAppTag(String errTag) {
+        errorAppTag = errTag;
+    }
+
+    @Override
+    public YangConstructType getYangConstructType() {
+        return YangConstructType.PATTERN_DATA;
+    }
+
+    @Override
+    public void validateDataOnEntry() throws DataModelException {
+        //TODO: implement the method.
+    }
+
+    @Override
+    public void validateDataOnExit() throws DataModelException {
+        //TODO: implement the method.
+    }
+}

@@ -15,14 +15,20 @@
  */
 package org.onosproject.yangutils.datamodel;
 
+import java.util.Iterator;
 import java.util.LinkedList;
 import java.util.List;
-
+import java.util.Set;
 import org.onosproject.yangutils.datamodel.exceptions.DataModelException;
+import org.onosproject.yangutils.linker.exceptions.LinkerException;
+import org.onosproject.yangutils.linker.impl.YangReferenceResolver;
+import org.onosproject.yangutils.linker.impl.YangResolutionInfo;
 import org.onosproject.yangutils.parser.Parsable;
+import org.onosproject.yangutils.plugin.manager.YangFileInfo;
 import org.onosproject.yangutils.utils.YangConstructType;
 
 import static org.onosproject.yangutils.datamodel.utils.DataModelUtils.detectCollidingChildUtil;
+import static org.onosproject.yangutils.datamodel.utils.DataModelUtils.linkInterFileReferences;
 import static org.onosproject.yangutils.datamodel.utils.DataModelUtils.resolveLinkingForResolutionList;
 
 /*-
@@ -79,7 +85,7 @@ public class YangModule extends YangNode
 
     /**
      * Reference:RFC 6020.
-     *
+     * <p>
      * The "contact" statement provides contact information for the module. The
      * argument is a string that is used to specify contact information for the
      * person or persons to whom technical queries concerning this module should
@@ -90,7 +96,7 @@ public class YangModule extends YangNode
 
     /**
      * Reference:RFC 6020.
-     *
+     * <p>
      * The "description" statement takes as an argument a string that contains a
      * human-readable textual description of this definition. The text is
      * provided in a language (or languages) chosen by the module developer; for
@@ -125,7 +131,7 @@ public class YangModule extends YangNode
 
     /**
      * Reference:RFC 6020.
-     *
+     * <p>
      * The "organization" statement defines the party responsible for this
      * module. The argument is a string that is used to specify a textual
      * description of the organization(s) under whose auspices this module was
@@ -408,6 +414,14 @@ public class YangModule extends YangNode
         resolveLinkingForResolutionList(resolutionList, this);
     }
 
+    @Override
+    public void resolveInterFileLinking() throws DataModelException {
+        // Get the list to be resolved.
+        List<YangResolutionInfo> resolutionList = getUnresolvedResolutionList();
+        // Resolve linking for a resolution list.
+        linkInterFileReferences(resolutionList, this);
+    }
+
     /**
      * Returns the textual reference.
      *
@@ -525,4 +539,43 @@ public class YangModule extends YangNode
     public void setResolutionList(List<YangResolutionInfo> resolutionList) {
         unresolvedResolutionList = resolutionList;
     }
+
+    @Override
+    public void addReferencesToImportList(Set<YangFileInfo> yangFileInfoSet)
+            throws LinkerException {
+        Iterator<YangImport> importInfoIterator = getImportList().iterator();
+        // Run through the imported list to add references.
+        while (importInfoIterator.hasNext()) {
+            YangImport yangImport = importInfoIterator.next();
+            try {
+                yangImport.addReferenceToImport(yangFileInfoSet);
+            } catch (DataModelException e) {
+                throw new LinkerException(e.getMessage());
+            }
+        }
+    }
+
+    @Override
+    public void addReferencesToIncludeList(Set<YangFileInfo> yangFileInfoSet)
+            throws LinkerException {
+        Iterator<YangInclude> includeInfoIterator = getIncludeList().iterator();
+        // Run through the included list to add references.
+        while (includeInfoIterator.hasNext()) {
+            YangInclude yangInclude = includeInfoIterator.next();
+            YangSubModule subModule = null;
+            try {
+                subModule = yangInclude.addReferenceToInclude(yangFileInfoSet);
+            } catch (DataModelException e) {
+                throw new LinkerException(e.getMessage());
+            }
+            // Check if the referred sub-modules parent is self
+            if (!(subModule.getBelongsTo().getModuleNode() == this)) {
+                try {
+                    yangInclude.reportIncludeError();
+                } catch (DataModelException e) {
+                    throw new LinkerException(e.getMessage());
+                }
+            }
+        }
+    }
 }

@@ -15,14 +15,20 @@
  */
 package org.onosproject.yangutils.datamodel;
 
+import java.util.Iterator;
 import java.util.LinkedList;
 import java.util.List;
-
+import java.util.Set;
 import org.onosproject.yangutils.datamodel.exceptions.DataModelException;
+import org.onosproject.yangutils.linker.exceptions.LinkerException;
+import org.onosproject.yangutils.linker.impl.YangReferenceResolver;
+import org.onosproject.yangutils.linker.impl.YangResolutionInfo;
 import org.onosproject.yangutils.parser.Parsable;
+import org.onosproject.yangutils.plugin.manager.YangFileInfo;
 import org.onosproject.yangutils.utils.YangConstructType;
 
 import static org.onosproject.yangutils.datamodel.utils.DataModelUtils.detectCollidingChildUtil;
+import static org.onosproject.yangutils.datamodel.utils.DataModelUtils.linkInterFileReferences;
 import static org.onosproject.yangutils.datamodel.utils.DataModelUtils.resolveLinkingForResolutionList;
 
 /*
@@ -92,7 +98,7 @@ public class YangSubModule extends YangNode
 
     /**
      * Reference RFC 6020.
-     *
+     * <p>
      * The "contact" statement provides contact information for the module. The
      * argument is a string that is used to specify contact information for the
      * person or persons to whom technical queries concerning this module should
@@ -338,6 +344,14 @@ public class YangSubModule extends YangNode
         resolveLinkingForResolutionList(resolutionList, this);
     }
 
+    @Override
+    public void resolveInterFileLinking() throws DataModelException {
+        // Get the list to be resolved.
+        List<YangResolutionInfo> resolutionList = getUnresolvedResolutionList();
+        // Resolve linking for a resolution list.
+        linkInterFileReferences(resolutionList, this);
+    }
+
     /**
      * Returns the list of leaves.
      *
@@ -507,4 +521,54 @@ public class YangSubModule extends YangNode
     public void setResolutionList(List<YangResolutionInfo> resolutionList) {
         this.unresolvedResolutionList = resolutionList;
     }
+
+    /**
+     * Links the sub-module with module.
+     *
+     * @param yangFileInfoSet YANG file information set
+     * @throws DataModelException a violation in data model rule
+     */
+    public void linkWithModule(Set<YangFileInfo> yangFileInfoSet)
+            throws DataModelException {
+        getBelongsTo().linkWithModule(yangFileInfoSet);
+    }
+
+    @Override
+    public void addReferencesToIncludeList(Set<YangFileInfo> yangFileInfoSet)
+            throws LinkerException {
+        Iterator<YangInclude> includeInfoIterator = getIncludeList().iterator();
+        // Run through the included list to add references.
+        while (includeInfoIterator.hasNext()) {
+            YangInclude yangInclude = includeInfoIterator.next();
+            YangSubModule subModule = null;
+            try {
+                subModule = yangInclude.addReferenceToInclude(yangFileInfoSet);
+            } catch (DataModelException e) {
+                throw new LinkerException(e.getMessage());
+            }
+            // Check if the referred sub-modules parent is self
+            if (!(subModule.getBelongsTo().getModuleNode() == getBelongsTo().getModuleNode())) {
+                try {
+                    yangInclude.reportIncludeError();
+                } catch (DataModelException e) {
+                    throw new LinkerException(e.getMessage());
+                }
+            }
+        }
+    }
+
+    @Override
+    public void addReferencesToImportList(Set<YangFileInfo> yangFileInfoSet)
+            throws LinkerException {
+        Iterator<YangImport> importInfoIterator = getImportList().iterator();
+        // Run through the imported list to add references.
+        while (importInfoIterator.hasNext()) {
+            YangImport yangImport = importInfoIterator.next();
+            try {
+                yangImport.addReferenceToImport(yangFileInfoSet);
+            } catch (DataModelException e) {
+                throw new LinkerException(e.getMessage());
+            }
+        }
+    }
 }

@@ -17,6 +17,9 @@
 package org.onosproject.yangutils.datamodel;
 
 import org.onosproject.yangutils.datamodel.exceptions.DataModelException;
+import org.onosproject.yangutils.linker.exceptions.LinkerException;
+import org.onosproject.yangutils.linker.impl.Resolvable;
+import org.onosproject.yangutils.linker.impl.ResolvableStatus;
 import org.onosproject.yangutils.parser.Parsable;
 import org.onosproject.yangutils.utils.YangConstructType;
 
@@ -244,21 +247,25 @@ public class YangType<T>
     }
 
     @Override
-    public void resolve() throws DataModelException {
+    public void resolve() throws LinkerException {
        /*
         * Check whether the data type is derived.
         */
         if (getDataType() != DERIVED) {
-            throw new DataModelException("Linker Error: Resolve should only be called for derived data types.");
+            throw new LinkerException("Linker Error: Resolve should only be called for derived data types.");
         }
 
         // Check if the derived info is present.
         YangDerivedInfo<?> derivedInfo = (YangDerivedInfo<?>) getDataTypeExtendedInfo();
         if (derivedInfo == null) {
-            throw new DataModelException("Linker Error: Derived information is missing.");
+            throw new LinkerException("Linker Error: Derived information is missing.");
         }
 
         // Initiate the resolution
-        setResolvableStatus(derivedInfo.resolve());
+        try {
+            setResolvableStatus(derivedInfo.resolve());
+        } catch (DataModelException e) {
+            throw new LinkerException(e.getMessage());
+        }
     }
 }

@@ -16,6 +16,9 @@
 package org.onosproject.yangutils.datamodel;
 
 import org.onosproject.yangutils.datamodel.exceptions.DataModelException;
+import org.onosproject.yangutils.linker.exceptions.LinkerException;
+import org.onosproject.yangutils.linker.impl.Resolvable;
+import org.onosproject.yangutils.linker.impl.ResolvableStatus;
 import org.onosproject.yangutils.parser.Parsable;
 import org.onosproject.yangutils.utils.YangConstructType;
 
@@ -259,37 +262,49 @@ public class YangUses
 
     @Override
     public void resolve()
-            throws DataModelException {
+            throws LinkerException {
 
         YangGrouping referredGrouping = getRefGroup();
 
         if (referredGrouping == null) {
-            throw new DataModelException("YANG uses linker error, cannot resolve uses");
+            throw new LinkerException("Linker Exception: YANG uses linker error, cannot resolve uses");
         }
 
         YangNode usesParentNode = getParentNodeInGenCode(this);
         if ((!(usesParentNode instanceof YangLeavesHolder))
                 || (!(usesParentNode instanceof CollisionDetector))) {
-            throw new DataModelException("YANG uses holder construct is wrong");
+            throw new LinkerException("Linker Exception: YANG uses holder construct is wrong");
         }
 
         YangLeavesHolder usesParentLeavesHolder = (YangLeavesHolder) usesParentNode;
         if (referredGrouping.getListOfLeaf() != null) {
             for (YangLeaf leaf : referredGrouping.getListOfLeaf()) {
-                ((CollisionDetector) usesParentLeavesHolder).detectCollidingChild(leaf.getName(),
-                        YangConstructType.LEAF_DATA);
+                try {
+                    ((CollisionDetector) usesParentLeavesHolder).detectCollidingChild(leaf.getName(),
+                            YangConstructType.LEAF_DATA);
+                } catch (DataModelException e) {
+                    throw new LinkerException(e.getMessage());
+                }
                 usesParentLeavesHolder.addLeaf(leaf);
             }
         }
         if (referredGrouping.getListOfLeafList() != null) {
             for (YangLeafList leafList : referredGrouping.getListOfLeafList()) {
-                ((CollisionDetector) usesParentLeavesHolder).detectCollidingChild(leafList.getName(),
-                        YangConstructType.LEAF_LIST_DATA);
+                try {
+                    ((CollisionDetector) usesParentLeavesHolder).detectCollidingChild(leafList.getName(),
+                            YangConstructType.LEAF_LIST_DATA);
+                } catch (DataModelException e) {
+                    throw new LinkerException(e.getMessage());
+                }
                 usesParentLeavesHolder.addLeafList(leafList);
             }
         }
 
-        YangNode.cloneSubTree(getRefGroup(), usesParentNode);
+        try {
+            YangNode.cloneSubTree(getRefGroup(), usesParentNode);
+        } catch (DataModelException e) {
+            throw new LinkerException(e.getMessage());
+        }
     }
 
     @Override

@@ -16,17 +16,15 @@
 
 package org.onosproject.yangutils.datamodel.utils;
 
-import java.util.Iterator;
 import java.util.List;
-
+import java.util.Set;
 import org.onosproject.yangutils.datamodel.CollisionDetector;
-import org.onosproject.yangutils.datamodel.YangImport;
 import org.onosproject.yangutils.datamodel.YangLeaf;
 import org.onosproject.yangutils.datamodel.YangLeafList;
 import org.onosproject.yangutils.datamodel.YangLeavesHolder;
 import org.onosproject.yangutils.datamodel.YangNode;
-import org.onosproject.yangutils.datamodel.YangReferenceResolver;
-import org.onosproject.yangutils.datamodel.YangResolutionInfo;
+import org.onosproject.yangutils.linker.impl.YangReferenceResolver;
+import org.onosproject.yangutils.linker.impl.YangResolutionInfo;
 import org.onosproject.yangutils.datamodel.YangRpc;
 import org.onosproject.yangutils.datamodel.exceptions.DataModelException;
 import org.onosproject.yangutils.parser.Parsable;
@@ -48,14 +46,13 @@ public final class DataModelUtils {
      * Detects the colliding identifier name in a given YANG node and its child.
      *
      * @param identifierName name for which collision detection is to be
-     * checked
-     * @param dataType type of YANG node asking for detecting collision
-     * @param node instance of calling node
+     *                       checked
+     * @param dataType       type of YANG node asking for detecting collision
+     * @param node           instance of calling node
      * @throws DataModelException a violation of data model rules
      */
     public static void detectCollidingChildUtil(String identifierName, YangConstructType dataType, YangNode node)
             throws DataModelException {
-
         if (dataType == YangConstructType.USES_DATA || dataType == YangConstructType.GROUPING_DATA) {
             detectCollidingForUsesGrouping(identifierName, dataType, node);
         } else {
@@ -81,9 +78,9 @@ public final class DataModelUtils {
      * Detects colliding of uses and grouping only with uses and grouping respectively.
      *
      * @param identifierName name for which collision detection is to be
-     * checked
-     * @param dataType type of YANG node asking for detecting collision
-     * @param node node instance of calling node
+     *                       checked
+     * @param dataType       type of YANG node asking for detecting collision
+     * @param node           node instance of calling node
      * @throws DataModelException a violation of data model rules
      */
     public static void detectCollidingForUsesGrouping(String identifierName, YangConstructType dataType, YangNode node)
@@ -103,9 +100,9 @@ public final class DataModelUtils {
     /**
      * Detects the colliding identifier name in a given leaf node.
      *
-     * @param listOfLeaf List of leaves to detect collision
+     * @param listOfLeaf     List of leaves to detect collision
      * @param identifierName name for which collision detection is to be
-     * checked
+     *                       checked
      * @throws DataModelException a violation of data model rules
      */
     private static void detectCollidingLeaf(List<YangLeaf> listOfLeaf, String identifierName)
@@ -127,7 +124,7 @@ public final class DataModelUtils {
      *
      * @param listOfLeafList list of leaf-lists to detect collision
      * @param identifierName name for which collision detection is to be
-     * checked
+     *                       checked
      * @throws DataModelException a violation of data model rules
      */
     private static void detectCollidingLeafList(List<YangLeafList> listOfLeafList, String identifierName)
@@ -148,7 +145,7 @@ public final class DataModelUtils {
      * Add a resolution information.
      *
      * @param resolutionInfo information about the YANG construct which has to
-     * be resolved
+     *                       be resolved
      * @throws DataModelException a violation of data model rules
      */
     public static void addResolutionInfo(YangResolutionInfo resolutionInfo)
@@ -165,64 +162,41 @@ public final class DataModelUtils {
         }
         YangReferenceResolver resolutionNode = (YangReferenceResolver) curNode;
 
-        if (!isPrefixValid(resolutionInfo.getEntityToResolveInfo().getEntityPrefix(),
-                resolutionNode)) {
-            throw new DataModelException("The prefix used is not valid");
-        }
         resolutionNode.addToResolutionList(resolutionInfo);
     }
 
     /**
-     * Evaluates whether the prefix in uses/type is valid.
+     * Resolve linking for a resolution list.
      *
-     * @param entityPrefix prefix in the current module/sub-module
-     * @param resolutionNode uses/type node which has the prefix with it
-     * @return whether prefix is valid or not
+     * @param resolutionList    resolution list for which linking to be done
+     * @param dataModelRootNode module/sub-module node
+     * @throws DataModelException a violation of data model rules
      */
-    private static boolean isPrefixValid(String entityPrefix, YangReferenceResolver resolutionNode) {
-        if (entityPrefix == null) {
-            return true;
-        }
-
-        if (resolutionNode.getPrefix().contentEquals(entityPrefix)) {
-            return true;
-        }
-
-        if (resolutionNode.getImportList() != null) {
-            for (YangImport importedInfo : resolutionNode.getImportList()) {
-                if (importedInfo.getPrefixId().contentEquals(entityPrefix)) {
-                    return true;
-                }
-            }
-        }
-
-        if (resolutionNode.getIncludeList() != null) {
-            /**
-             * TODO: check if the prefix matches with the imported data
+    public static void resolveLinkingForResolutionList(List<YangResolutionInfo> resolutionList,
+                                                       YangReferenceResolver dataModelRootNode)
+            throws DataModelException {
 
-             for (YangInclude includedInfo : resolutionNode.getIncludeList()) {
-             if (includedInfo.contentEquals(prefix)) {
-             return true;
-             }
-             }*/
+        for (YangResolutionInfo resolutionInfo : resolutionList) {
+            resolutionInfo.resolveLinkingForResolutionInfo(dataModelRootNode);
         }
-
-        return false;
     }
 
     /**
-     * Resolve linking for a resolution list.
+     * Links type/uses referring to typedef/uses of inter YANG file.
      *
-     * @param resolutionList resolution list for which linking to be done
+     * @param resolutionList    resolution list for which linking to be done
      * @param dataModelRootNode module/sub-module node
      * @throws DataModelException a violation of data model rules
      */
-    public static void resolveLinkingForResolutionList(List<YangResolutionInfo> resolutionList,
-            YangReferenceResolver dataModelRootNode)
+    public static void linkInterFileReferences(List<YangResolutionInfo> resolutionList,
+                                               YangReferenceResolver dataModelRootNode)
             throws DataModelException {
-
+        /*
+         * Run through the resolution list, find type/uses referring to
+         * inter file typedef/grouping, ask for linking.
+         */
         for (YangResolutionInfo resolutionInfo : resolutionList) {
-            resolutionInfo.resolveLinkingForResolutionInfo(dataModelRootNode.getPrefix());
+            resolutionInfo.linkInterFile(dataModelRootNode);
         }
     }
 
@@ -244,24 +218,23 @@ public final class DataModelUtils {
     }
 
     /**
-     * Returns module's data model node to which sub-module belongs to.
+     * Returns referred node in a given set.
      *
-     * @param yangFileInfo YANG file information
-     * @param belongsToModuleName name of the module to which sub-module belongs to
-     * @return module node to which sub-module belongs to
-     * @throws DataModelException when belongs to module node is not found
+     * @param yangFileInfoSet YANG file info set
+     * @param refNodeName     name of the node which is referred
+     * @return referred node's reference
      */
-    public static YangNode findBelongsToModuleNode(List<YangFileInfo> yangFileInfo,
-                String belongsToModuleName) throws DataModelException {
-        Iterator<YangFileInfo> yangFileIterator = yangFileInfo.iterator();
-        while (yangFileIterator.hasNext()) {
-            YangFileInfo yangFile = yangFileIterator.next();
-            YangNode yangNode = yangFile.getRootNode();
-            if (yangNode.getName().equals(belongsToModuleName)) {
-                return yangNode;
+    public static YangNode findReferredNode(Set<YangFileInfo> yangFileInfoSet, String refNodeName) {
+        /*
+         * Run through the YANG files to see which YANG file matches the
+         * referred node name.
+         */
+        for (YangFileInfo yangFileInfo : yangFileInfoSet) {
+            YangNode yangNode = yangFileInfo.getRootNode();
+            if (yangNode.getName().equals(refNodeName)) {
+                return yangFileInfo.getRootNode();
             }
         }
-        throw new DataModelException("YANG file error : Module " + belongsToModuleName + " to which sub-module " +
-                "belongs to is not found.");
+        return null;
     }
 }

@@ -16,8 +16,8 @@
 
 package org.onosproject.yangutils.linker;
 
-import java.util.Map;
-import org.onosproject.yangutils.datamodel.YangReferenceResolver;
+import java.util.Set;
+import org.onosproject.yangutils.plugin.manager.YangFileInfo;
 
 /**
  * Abstraction of entity which provides linking service of YANG files.
@@ -28,8 +28,7 @@ public interface YangLinker {
      * Resolve the import and include dependencies for a given resolution
      * information.
      *
-     * @param fileMapEntry map entry for which resolution is to be done
-     * @param yangFilesMap map of dependent file and resolution information*/
-    void resolveDependencies(Map.Entry<String, YangReferenceResolver> fileMapEntry, Map<String,
-            YangReferenceResolver> yangFilesMap);
+     * @param yangFileInfoSet set of all dependent YANG files
+     */
+    void resolveDependencies(Set<YangFileInfo> yangFileInfoSet);
 }

+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.linker.exceptions;
+
+/**
+ * Represents base class for exceptions in linker operations.
+ */
+public class LinkerException extends RuntimeException {
+
+    private static final long serialVersionUID = 20160211L;
+    private int lineNumber;
+    private int charPositionInLine;
+    private String fileName;
+
+    /**
+     * Creates a new linker exception.
+     */
+    public LinkerException() {
+        super();
+    }
+
+    /**
+     * Creates a new linker exception with given message.
+     *
+     * @param message the detail of exception in string
+     */
+    public LinkerException(String message) {
+        super(message);
+    }
+
+    /**
+     * Creates a new linker exception from given message and cause.
+     *
+     * @param message the detail of exception in string
+     * @param cause   underlying cause of the error
+     */
+    public LinkerException(final String message, final Throwable cause) {
+        super(message, cause);
+    }
+
+    /**
+     * Creates a new linker exception from cause.
+     *
+     * @param cause underlying cause of the error
+     */
+    public LinkerException(final Throwable cause) {
+        super(cause);
+    }
+
+    /**
+     * Returns line number of the exception.
+     *
+     * @return line number of the exception
+     */
+    public int getLineNumber() {
+        return this.lineNumber;
+    }
+
+    /**
+     * Returns YANG file name of the exception.
+     *
+     * @return YANG file name of the exception
+     */
+    public String getFileName() {
+        return this.fileName;
+    }
+
+    /**
+     * Returns position of the exception.
+     *
+     * @return position of the exception
+     */
+    public int getCharPositionInLine() {
+        return this.charPositionInLine;
+    }
+
+    /**
+     * Sets line number of YANG file.
+     *
+     * @param line line number of YANG file
+     */
+    public void setLine(int line) {
+        this.lineNumber = line;
+    }
+
+    /**
+     * Sets position of exception.
+     *
+     * @param charPosition position of exception
+     */
+    public void setCharPosition(int charPosition) {
+        this.charPositionInLine = charPosition;
+    }
+
+    /**
+     * Sets file name in parser exception.
+     *
+     * @param fileName YANG file name
+     */
+    public void setFileName(String fileName) {
+        this.fileName = fileName;
+    }
+}

+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+
+/**
+ * Custom linker exceptions.
+ */
+package org.onosproject.yangutils.linker.exceptions;

@@ -14,9 +14,9 @@
  * limitations under the License.
  */
 
-package org.onosproject.yangutils.datamodel;
+package org.onosproject.yangutils.linker.impl;
 
-import org.onosproject.yangutils.datamodel.exceptions.DataModelException;
+import org.onosproject.yangutils.linker.exceptions.LinkerException;
 
 /**
  * Abstraction of YANG resolvable information. Abstracted to obtain the
@@ -47,8 +47,8 @@ public interface Resolvable {
     /**
      * Resolves the linking.
      *
-     * @throws DataModelException data model error
+     * @throws LinkerException linker error
      */
     void resolve()
-            throws DataModelException;
+            throws LinkerException;
 }

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package org.onosproject.yangutils.datamodel;
+package org.onosproject.yangutils.linker.impl;
 
 /**
  * Represents the status of resolvable entity.
@@ -40,6 +40,12 @@ public enum ResolvableStatus {
     /**
      * Identifies that resolvable entity is resolved.
      */
-    RESOLVED
+    RESOLVED,
+
+    /**
+     * Identifies that resolvable entity is inter file linked (i.e. complete
+     * linking with external files).
+     */
+    INTER_FILE_LINKED
 
 }

@@ -13,9 +13,12 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.onosproject.yangutils.datamodel;
+package org.onosproject.yangutils.linker.impl;
 
-import org.onosproject.yangutils.datamodel.exceptions.DataModelException;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.datamodel.YangType;
+import org.onosproject.yangutils.datamodel.YangUses;
+import org.onosproject.yangutils.linker.exceptions.LinkerException;
 
 /**
  * Represents information about entity being resolved.
@@ -61,7 +64,7 @@ public class YangEntityToResolveInfo<T> {
      * Sets parent node which contains the entity to be resolved.
      *
      * @param holderOfEntityToResolve parent node which contains the entity to
-     * be resolved
+     *                                be resolved
      */
     public void setHolderOfEntityToResolve(YangNode holderOfEntityToResolve) {
         this.holderOfEntityToResolve = holderOfEntityToResolve;
@@ -71,10 +74,10 @@ public class YangEntityToResolveInfo<T> {
      * Retrieves the prefix of the entity.
      *
      * @return entities prefix
-     * @throws DataModelException data model error
+     * @throws LinkerException linker error
      */
     public String getEntityPrefix()
-            throws DataModelException {
+            throws LinkerException {
         if (getEntityToResolve() == null) {
             return null;
         }
@@ -86,7 +89,7 @@ public class YangEntityToResolveInfo<T> {
         } else if (entityToBeResolved instanceof YangUses) {
             prefix = ((YangUses) entityToBeResolved).getPrefix();
         } else {
-            throw new DataModelException("Data Model Exception: Entity to resolved is other than type/uses");
+            throw new LinkerException("Linker Exception: Entity to resolved is other than type/uses");
         }
         return prefix;
     }

+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+
+package org.onosproject.yangutils.linker.impl;
+
+import java.util.Set;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.datamodel.YangSubModule;
+import org.onosproject.yangutils.datamodel.exceptions.DataModelException;
+import org.onosproject.yangutils.linker.YangLinker;
+import org.onosproject.yangutils.linker.exceptions.LinkerException;
+import org.onosproject.yangutils.plugin.manager.YangFileInfo;
+
+import static org.onosproject.yangutils.utils.UtilConstants.NEW_LINE;
+
+/**
+ * Representation of entity which provides linking service of YANG files.
+ */
+public class YangLinkerManager implements YangLinker {
+    @Override
+    public void resolveDependencies(Set<YangFileInfo> yangFileInfoSet) {
+
+        // Carry out linking of sub module with module.
+        linkSubModulesToParentModule(yangFileInfoSet);
+
+        // Add references to import list.
+        addRefToYangFilesImportList(yangFileInfoSet);
+
+        // Add reference to include list.
+        addRefToYangFilesIncludeList(yangFileInfoSet);
+
+        // TODO check for circular import/include.
+
+        // Carry out inter-file linking.
+        processInterFileLinking(yangFileInfoSet);
+    }
+
+    /**
+     * Resolves sub-module linking by linking sub module with parent module.
+     *
+     * @param yangFileInfoSet set of YANG files info
+     * @throws LinkerException fails to link sub-module to parent module
+     */
+    public void linkSubModulesToParentModule(Set<YangFileInfo> yangFileInfoSet) throws LinkerException {
+        for (YangFileInfo yangFileInfo : yangFileInfoSet) {
+            YangNode yangNode = yangFileInfo.getRootNode();
+            if (yangNode instanceof YangSubModule) {
+                try {
+                    ((YangSubModule) yangNode).linkWithModule(yangFileInfoSet);
+                } catch (DataModelException e) {
+                    String errorInfo = "YANG file error: " + yangFileInfo.getYangFileName() + " at line: "
+                            + e.getLineNumber() + " at position: " + e.getCharPositionInLine() + NEW_LINE
+                            + e.getMessage();
+                    throw new LinkerException(errorInfo);
+                }
+            }
+        }
+    }
+
+    /**
+     * Adds imported node information to the import list.
+     *
+     * @param yangFileInfoSet set of YANG files info
+     * @throws LinkerException fails to find imported module
+     */
+    public void addRefToYangFilesImportList(Set<YangFileInfo> yangFileInfoSet) throws LinkerException {
+        for (YangFileInfo yangFileInfo : yangFileInfoSet) {
+            YangNode yangNode = yangFileInfo.getRootNode();
+            if (yangNode instanceof YangReferenceResolver) {
+                ((YangReferenceResolver) yangNode).addReferencesToImportList(yangFileInfoSet);
+            }
+        }
+    }
+
+    /**
+     * Adds included node information to the include list.
+     *
+     * @param yangFileInfoSet set of YANG files info
+     * @throws LinkerException fails to find included sub-module
+     */
+    public void addRefToYangFilesIncludeList(Set<YangFileInfo> yangFileInfoSet) throws LinkerException {
+        for (YangFileInfo yangFileInfo : yangFileInfoSet) {
+            YangNode yangNode = yangFileInfo.getRootNode();
+            if (yangNode instanceof YangReferenceResolver) {
+                ((YangReferenceResolver) yangNode).addReferencesToIncludeList(yangFileInfoSet);
+            }
+        }
+    }
+
+    /**
+     * Processes inter file linking for type and uses.
+     *
+     * @param yangFileInfoSet set of YANG files info
+     * @throws LinkerException a violation in linker execution
+     */
+    public void processInterFileLinking(Set<YangFileInfo> yangFileInfoSet) throws LinkerException {
+        for (YangFileInfo yangFileInfo : yangFileInfoSet) {
+            try {
+                ((YangReferenceResolver) yangFileInfo.getRootNode()).resolveInterFileLinking();
+            } catch (DataModelException e) {
+                String errorInfo = "Error in file: " + yangFileInfo.getYangFileName() + " at line: "
+                        + e.getLineNumber() + " at position: " + e.getCharPositionInLine() + NEW_LINE + e.getMessage();
+                throw new LinkerException(errorInfo);
+            }
+        }
+    }
+}

@@ -14,10 +14,15 @@
  * limitations under the License.
  */
 
-package org.onosproject.yangutils.datamodel;
+package org.onosproject.yangutils.linker.impl;
 
 import java.util.List;
+import java.util.Set;
+import org.onosproject.yangutils.datamodel.YangImport;
+import org.onosproject.yangutils.datamodel.YangInclude;
 import org.onosproject.yangutils.datamodel.exceptions.DataModelException;
+import org.onosproject.yangutils.linker.exceptions.LinkerException;
+import org.onosproject.yangutils.plugin.manager.YangFileInfo;
 
 /**
  * Abstraction of YANG dependency resolution information. Abstracted to obtain the
@@ -33,7 +38,7 @@ public interface YangReferenceResolver {
     List<YangResolutionInfo> getUnresolvedResolutionList();
 
     /**
-     * Add to the resolution list.
+     * Adds to the resolution list.
      *
      * @param resolutionInfo resolution information
      */
@@ -54,7 +59,7 @@ public interface YangReferenceResolver {
     List<YangImport> getImportList();
 
     /**
-     * Add to the import list.
+     * Adds to the import list.
      *
      * @param yangImport import to be added
      */
@@ -75,14 +80,14 @@ public interface YangReferenceResolver {
     List<YangInclude> getIncludeList();
 
     /**
-     * Add to the include list.
+     * Adds to the include list.
      *
      * @param yangInclude include to be added
      */
     void addToIncludeList(YangInclude yangInclude);
 
     /**
-     * Create include list.
+     * Creates include list.
      *
      * @param includeList include list
      */
@@ -96,16 +101,39 @@ public interface YangReferenceResolver {
     String getPrefix();
 
     /**
-     * Set prefix of resolution list root node.
+     * Sets prefix of resolution list root node.
      *
      * @param prefix resolution root node prefix
      */
     void setPrefix(String prefix);
 
     /**
-     * Resolve self file linking.
+     * Resolves self file linking.
      *
      * @throws DataModelException a violation in data model rule
      */
     void resolveSelfFileLinking() throws DataModelException;
+
+    /**
+     * Resolves inter file linking.
+     *
+     * @throws DataModelException a violation in data model rule
+     */
+    void resolveInterFileLinking() throws DataModelException;
+
+    /**
+     * Adds references to include.
+     *
+     * @param yangFileInfoSet YANG file info set
+     * @throws LinkerException a violation of linker rules
+     */
+    void addReferencesToIncludeList(Set<YangFileInfo> yangFileInfoSet) throws LinkerException;
+
+    /**
+     * Adds references to import.
+     *
+     * @param yangFileInfoSet YANG file info set
+     * @throws LinkerException a violation of linker rules
+     */
+    void addReferencesToImportList(Set<YangFileInfo> yangFileInfoSet) throws LinkerException;
 }

@@ -14,15 +14,26 @@
  * limitations under the License.
  */
 
-package org.onosproject.yangutils.datamodel;
+package org.onosproject.yangutils.linker.impl;
 
 import java.util.Stack;
+import org.onosproject.yangutils.datamodel.LocationInfo;
+import org.onosproject.yangutils.datamodel.YangDataTypes;
+import org.onosproject.yangutils.datamodel.YangDerivedInfo;
+import org.onosproject.yangutils.datamodel.YangGrouping;
+import org.onosproject.yangutils.datamodel.YangImport;
+import org.onosproject.yangutils.datamodel.YangInclude;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.datamodel.YangType;
+import org.onosproject.yangutils.datamodel.YangTypeDef;
+import org.onosproject.yangutils.datamodel.YangUses;
 import org.onosproject.yangutils.datamodel.exceptions.DataModelException;
 
-import static org.onosproject.yangutils.datamodel.ResolvableStatus.INTRA_FILE_RESOLVED;
-import static org.onosproject.yangutils.datamodel.ResolvableStatus.LINKED;
-import static org.onosproject.yangutils.datamodel.ResolvableStatus.RESOLVED;
-import static org.onosproject.yangutils.datamodel.ResolvableStatus.UNRESOLVED;
+import static org.onosproject.yangutils.linker.impl.ResolvableStatus.INTER_FILE_LINKED;
+import static org.onosproject.yangutils.linker.impl.ResolvableStatus.INTRA_FILE_RESOLVED;
+import static org.onosproject.yangutils.linker.impl.ResolvableStatus.LINKED;
+import static org.onosproject.yangutils.linker.impl.ResolvableStatus.RESOLVED;
+import static org.onosproject.yangutils.linker.impl.ResolvableStatus.UNRESOLVED;
 
 /**
  * Represents resolution object which will be resolved by linker.
@@ -36,21 +47,28 @@ public class YangResolutionInfo<T> implements LocationInfo {
      */
     private YangEntityToResolveInfo<T> entityToResolveInfo;
 
-    // Error Line number.
+    /**
+     * Error line number.
+     */
     private int lineNumber;
 
-    // Error character position.
+    /**
+     * Error character position in number.
+     */
     private int charPosition;
 
-    /*
+    /**
+     * Current module/sub-module reference, will be used in inter-file/
+     * inter-jar scenario to get the import/include list.
+     */
+    private YangReferenceResolver curReferenceResolver;
+
+    /**
      * Stack for type/uses is maintained for hierarchical references, this is
      * used during resolution.
      */
     private Stack<YangEntityToResolveInfo<T>> partialResolvedStack;
 
-    // Module/Sub-module prefix.
-    private String resolutionInfoRootNodePrefix;
-
     /**
      * It is private to ensure the overloaded method be invoked to create an
      * object.
@@ -69,25 +87,25 @@ public class YangResolutionInfo<T> implements LocationInfo {
      * @param charPositionInLine error character position in line
      */
     public YangResolutionInfo(T dataNode, YangNode holderNode, int lineNumber, int charPositionInLine) {
-        setEntityToResolveInfo(new YangEntityToResolveInfo<T>());
+        setEntityToResolveInfo(new YangEntityToResolveInfo<>());
         getEntityToResolveInfo().setEntityToResolve(dataNode);
         getEntityToResolveInfo().setHolderOfEntityToResolve(holderNode);
         this.setLineNumber(lineNumber);
         this.setCharPosition(charPositionInLine);
-        setPartialResolvedStack(new Stack<YangEntityToResolveInfo<T>>());
+        setPartialResolvedStack(new Stack<>());
     }
 
     /**
-     * Resolve linking with all the ancestors node for a resolution info.
+     * Resolves linking with all the ancestors node for a resolution info.
      *
-     * @param resolutionInfoNodePrefix module/sub-module prefix
+     * @param dataModelRootNode module/sub-module node
      * @throws DataModelException DataModelException a violation of data model
      *                            rules
      */
-    public void resolveLinkingForResolutionInfo(String resolutionInfoNodePrefix)
+    public void resolveLinkingForResolutionInfo(YangReferenceResolver dataModelRootNode)
             throws DataModelException {
 
-        this.resolutionInfoRootNodePrefix = resolutionInfoNodePrefix;
+        setCurReferenceResolver(dataModelRootNode);
 
         // Current node to resolve, it can be a YANG type or YANG uses.
         T entityToResolve = getEntityToResolveInfo().getEntityToResolve();
@@ -142,7 +160,7 @@ public class YangResolutionInfo<T> implements LocationInfo {
                         /*
                          * If the top of the stack is already linked then
                          * resolve the references and pop the entity and
-                         * continue with remaining stack elements to resolve
+                         * continue with remaining stack elements to resolve.
                          */
                         resolveTopOfStack();
                         getPartialResolvedStack().pop();
@@ -151,8 +169,7 @@ public class YangResolutionInfo<T> implements LocationInfo {
 
                     case INTRA_FILE_RESOLVED: {
                         /*
-                         * TODO: this needs to be deleted, when inter-file
-                         * resolution is implmeneted
+                         * Pop the top of the stack.
                          */
                         getPartialResolvedStack().pop();
                         break;
@@ -187,7 +204,7 @@ public class YangResolutionInfo<T> implements LocationInfo {
     }
 
     /**
-     * Resolve the current entity in the stack.
+     * Resolves the current entity in the stack.
      */
     private void resolveTopOfStack()
             throws DataModelException {
@@ -207,12 +224,12 @@ public class YangResolutionInfo<T> implements LocationInfo {
     private void linkTopOfStackReferenceUpdateStack()
             throws DataModelException {
 
-        if (!isSelfFileReference()) {
-            /*
-             * TODO: use mojo utilities to load the referred module/sub-module
-             * and get the reference to the corresponding referred entity
-             */
-
+        /*
+         * Check if self file reference is there, this will not check for the
+         * scenario when prefix is not present and type/uses is present in
+         * sub-module from include list.
+         */
+        if (!isCandidateForSelfFileReference()) {
             ((Resolvable) getCurrentEntityToResolveFromStack()).setResolvableStatus(INTRA_FILE_RESOLVED);
             return;
         }
@@ -240,34 +257,29 @@ public class YangResolutionInfo<T> implements LocationInfo {
 
             potentialAncestorWithReferredNode = potentialAncestorWithReferredNode.getParent();
         }
+
+        /*
+         * In case prefix is not present it's a candidate for inter-file
+         * resolution via include list.
+         */
+        if (getRefPrefix() == null) {
+            ((Resolvable) getCurrentEntityToResolveFromStack()).setResolvableStatus(INTRA_FILE_RESOLVED);
+        }
     }
 
     /**
-     * Check if the reference in self file or in external file.
+     * Checks if the reference in self file or in external file.
      *
      * @return true if self file reference, false otherwise
      * @throws DataModelException a violation of data model rules
      */
-    private boolean isSelfFileReference()
-            throws DataModelException {
-        String prefix;
-        if (getCurrentEntityToResolveFromStack() instanceof YangType) {
-            prefix = ((YangType<?>) getCurrentEntityToResolveFromStack()).getPrefix();
-        } else if (getCurrentEntityToResolveFromStack() instanceof YangUses) {
-            prefix = ((YangUses) getCurrentEntityToResolveFromStack()).getPrefix();
-        } else {
-            throw new DataModelException("Data Model Exception: Entity to resolved is other than type/uses");
-        }
-
-        if (prefix == null) {
-            return true;
-        }
-        return prefix.contentEquals(resolutionInfoRootNodePrefix);
-
+    private boolean isCandidateForSelfFileReference() throws DataModelException {
+        String prefix = getRefPrefix();
+        return prefix == null || prefix.contentEquals(getCurReferenceResolver().getPrefix());
     }
 
     /**
-     * Check for the referred node defined in a ancestor scope.
+     * Checks for the referred node defined in a ancestor scope.
      *
      * @param potentialReferredNode potential referred node
      * @return status of resolution and updating the partial resolved stack with
@@ -282,7 +294,7 @@ public class YangResolutionInfo<T> implements LocationInfo {
             if (isReferredNode(potentialReferredNode)) {
 
                 // Adds reference link of entity to the node under resolution.
-                addReferredEntityLink(potentialReferredNode);
+                addReferredEntityLink(potentialReferredNode, LINKED);
 
                 /**
                  * resolve the reference and update the partial resolution stack
@@ -303,7 +315,7 @@ public class YangResolutionInfo<T> implements LocationInfo {
     }
 
     /**
-     * Check if the potential referred node is the actual referred node.
+     * Checks if the potential referred node is the actual referred node.
      *
      * @param potentialReferredNode typedef/grouping node
      * @return true if node is of resolve type otherwise false
@@ -334,7 +346,7 @@ public class YangResolutionInfo<T> implements LocationInfo {
     }
 
     /**
-     * Check if node name is same as name in resolution info, i.e. name of
+     * Checks if node name is same as name in resolution info, i.e. name of
      * typedef/grouping is same as name of type/uses.
      *
      * @param node typedef/grouping node
@@ -366,9 +378,10 @@ public class YangResolutionInfo<T> implements LocationInfo {
      * Adds reference of grouping/typedef in uses/type.
      *
      * @param referredNode grouping/typedef node being referred
+     * @param linkedStatus linked status if success.
      * @throws DataModelException a violation of data model rules
      */
-    private void addReferredEntityLink(YangNode referredNode)
+    private void addReferredEntityLink(YangNode referredNode, ResolvableStatus linkedStatus)
             throws DataModelException {
         if (getCurrentEntityToResolveFromStack() instanceof YangType) {
             YangDerivedInfo<?> derivedInfo = (YangDerivedInfo<?>)
@@ -382,7 +395,7 @@ public class YangResolutionInfo<T> implements LocationInfo {
         }
 
         // Sets the resolution status in inside the type/uses.
-        ((Resolvable) getCurrentEntityToResolveFromStack()).setResolvableStatus(LINKED);
+        ((Resolvable) getCurrentEntityToResolveFromStack()).setResolvableStatus(linkedStatus);
     }
 
     /**
@@ -402,7 +415,7 @@ public class YangResolutionInfo<T> implements LocationInfo {
             if (((YangTypeDef) referredNode).getTypeDefBaseType().getDataType()
                     == YangDataTypes.DERIVED) {
 
-                YangEntityToResolveInfo<YangType<?>> unResolvedEntityInfo = new YangEntityToResolveInfo<YangType<?>>();
+                YangEntityToResolveInfo<YangType<?>> unResolvedEntityInfo = new YangEntityToResolveInfo<>();
                 unResolvedEntityInfo.setEntityToResolve(((YangTypeDef) referredNode)
                         .getTypeDefBaseType());
                 unResolvedEntityInfo.setHolderOfEntityToResolve(referredNode);
@@ -421,7 +434,7 @@ public class YangResolutionInfo<T> implements LocationInfo {
     }
 
     /**
-     * Return if there is any unresolved uses in grouping.
+     * Returns if there is any unresolved uses in grouping.
      *
      * @param node grouping/typedef node
      */
@@ -433,18 +446,11 @@ public class YangResolutionInfo<T> implements LocationInfo {
         YangNode curNode = node.getChild();
         while (curNode != null) {
             if (curNode instanceof YangUses) {
-                ResolvableStatus curResolveStatus = ((Resolvable) curNode).getResolvableStatus();
-                if (curResolveStatus == UNRESOLVED) {
-                    /**
-                     * The current uses is not resolved, add it to partial
-                     * resolved stack
-                     */
-                    YangEntityToResolveInfo<YangUses> unResolvedEntityInfo = new YangEntityToResolveInfo<YangUses>();
-                    unResolvedEntityInfo.setEntityToResolve((YangUses) curNode);
-                    unResolvedEntityInfo.setHolderOfEntityToResolve(node);
-                    addInPartialResolvedStack((YangEntityToResolveInfo<T>) unResolvedEntityInfo);
+                YangEntityToResolveInfo<YangUses> unResolvedEntityInfo = new YangEntityToResolveInfo<>();
+                unResolvedEntityInfo.setEntityToResolve((YangUses) curNode);
+                unResolvedEntityInfo.setHolderOfEntityToResolve(node);
+                addInPartialResolvedStack((YangEntityToResolveInfo<T>) unResolvedEntityInfo);
 
-                }
             }
             curNode = curNode.getNextSibling();
         }
@@ -503,7 +509,7 @@ public class YangResolutionInfo<T> implements LocationInfo {
      * @param entityToResolveInfo information about the entity that needs to be
      *                            resolved
      */
-    public void setEntityToResolveInfo(YangEntityToResolveInfo<T> entityToResolveInfo) {
+    private void setEntityToResolveInfo(YangEntityToResolveInfo<T> entityToResolveInfo) {
         this.entityToResolveInfo = entityToResolveInfo;
     }
 
@@ -526,4 +532,324 @@ public class YangResolutionInfo<T> implements LocationInfo {
     public void setCharPosition(int charPositionInLine) {
         this.charPosition = charPositionInLine;
     }
+
+    /**
+     * Returns current module/sub-module reference, will be used in inter-file/
+     * inter-jar scenario to get the import/include list.
+     *
+     * @return current module/sub-module reference
+     */
+    private YangReferenceResolver getCurReferenceResolver() {
+        return curReferenceResolver;
+    }
+
+    /**
+     * Sets current module/sub-module reference, will be used in inter-file/
+     * inter-jar scenario to get the import/include list.
+     *
+     * @param curReferenceResolver current module/sub-module reference
+     */
+    private void setCurReferenceResolver(YangReferenceResolver curReferenceResolver) {
+        this.curReferenceResolver = curReferenceResolver;
+    }
+
+    /**
+     * Performs inter file linking of uses/type referring to typedef/grouping
+     * of other YANG file.
+     *
+     * @param dataModelRootNode module/sub-module node
+     * @throws DataModelException a violation in data model rule
+     */
+    public void linkInterFile(YangReferenceResolver dataModelRootNode)
+            throws DataModelException {
+
+        setCurReferenceResolver(dataModelRootNode);
+
+        // Current node to resolve, it can be a YANG type or YANG uses.
+        T entityToResolve = getEntityToResolveInfo().getEntityToResolve();
+
+        // Check if linking is already done
+        if (entityToResolve instanceof Resolvable) {
+            Resolvable resolvable = (Resolvable) entityToResolve;
+            if (resolvable.getResolvableStatus() == RESOLVED) {
+                return;
+            }
+        } else {
+            throw new DataModelException("Data Model Exception: Entity to resolved is not Resolvable");
+        }
+
+        // Push the initial entity to resolve in stack.
+        addInPartialResolvedStack(getEntityToResolveInfo());
+
+        // Inter file linking and resolution.
+        linkInterFileAndResolve();
+    }
+
+    /**
+     * Returns the referenced prefix of entity under resolution.
+     *
+     * @return referenced prefix of entity under resolution
+     * @throws DataModelException a violation in data model rule
+     */
+    private String getRefPrefix() throws DataModelException {
+        String refPrefix;
+        if (getCurrentEntityToResolveFromStack() instanceof YangType) {
+            refPrefix = ((YangType<?>) getCurrentEntityToResolveFromStack()).getPrefix();
+        } else if (getCurrentEntityToResolveFromStack() instanceof YangUses) {
+            refPrefix = ((YangUses) getCurrentEntityToResolveFromStack()).getPrefix();
+        } else {
+            throw new DataModelException("Data Model Exception: Entity to resolved is other than type/uses");
+        }
+        return refPrefix;
+    }
+
+    /**
+     * Performs inter file linking and resolution.
+     *
+     * @throws DataModelException a violation in data model rule
+     */
+    private void linkInterFileAndResolve()
+            throws DataModelException {
+
+        while (getPartialResolvedStack().size() != 0) {
+
+            // Current node to resolve, it can be a YANG type or YANG uses.
+            T entityToResolve = getCurrentEntityToResolveFromStack();
+            // Check if linking is already done
+            if (entityToResolve instanceof Resolvable) {
+
+                Resolvable resolvable = (Resolvable) entityToResolve;
+                switch (resolvable.getResolvableStatus()) {
+                    case RESOLVED: {
+                        /*
+                         * If the entity is already resolved in the stack, then
+                         * pop it and continue with the remaining stack elements
+                         * to resolve
+                         */
+                        getPartialResolvedStack().pop();
+                        break;
+                    }
+
+                    case INTER_FILE_LINKED: {
+                        /*
+                         * If the top of the stack is already linked then
+                         * resolve the references and pop the entity and
+                         * continue with remaining stack elements to resolve
+                         */
+                        resolveTopOfStack();
+                        getPartialResolvedStack().pop();
+                        break;
+                    }
+
+                    case INTRA_FILE_RESOLVED: {
+                        /*
+                         * If the top of the stack is intra file resolved
+                         * then check if top of stack is linked, if not
+                         * link it using import/include list and push the
+                         * linked referred entity to the stack, otherwise
+                         * only push it to the stack.
+                         */
+                        linkInterFileTopOfStackRefUpdateStack();
+                        break;
+                    }
+
+                    default: {
+                        throw new DataModelException("Data Model Exception: Unsupported, linker state");
+                    }
+
+                }
+
+            } else {
+                throw new DataModelException("Data Model Exception: Entity to resolved is other than type/uses");
+            }
+
+        }
+
+    }
+
+    /**
+     * Links the top of the stack if it's inter-file and update stack.
+     *
+     * @throws DataModelException data model error
+     */
+    private void linkInterFileTopOfStackRefUpdateStack() throws DataModelException {
+
+        /*
+         * Obtain the referred node of top of stack entity under resolution
+         */
+        T referredNode = getRefNode();
+
+        /*
+         * Check for null for scenario when it's not linked and inter-file
+         * linking is required.
+         */
+        if (referredNode == null) {
+
+            /*
+             * Check if prefix is null or not, to identify whether to search
+             * in import list or include list.
+             */
+            if (getRefPrefix() != null && !(getRefPrefix().contentEquals(getCurReferenceResolver().getPrefix()))) {
+                if (resolveWithImport()) {
+                    return;
+                }
+            } else {
+                if (resolveWithInclude()) {
+                    return;
+                }
+            }
+            // Exception when referred typedef/grouping is not found.
+            DataModelException dataModelException = new DataModelException("YANG file error: Referred " +
+                    "typedef/grouping for a given type/uses can't be found.");
+            dataModelException.setLine(getLineNumber());
+            dataModelException.setCharPosition(getCharPosition());
+            throw dataModelException;
+        } else {
+            /*
+             * If referred node is already linked, then just change the status
+             * and push to the stack.
+             */
+            ((Resolvable) getCurrentEntityToResolveFromStack()).setResolvableStatus(INTER_FILE_LINKED);
+            addUnresolvedRecursiveReferenceToStack((YangNode) referredNode);
+        }
+    }
+
+    /**
+     * Finds and resolves with include list.
+     *
+     * @return true if resolved, false otherwise
+     * @throws DataModelException a violation in data model rule
+     */
+    private boolean resolveWithInclude() throws DataModelException {
+        /*
+         * Run through all the nodes in include list and search for referred
+         * typedef/grouping at the root level.
+         */
+        for (YangInclude yangInclude : getCurReferenceResolver().getIncludeList()) {
+            YangNode linkedNode = null;
+            if (getCurrentEntityToResolveFromStack() instanceof YangType) {
+                linkedNode = findRefTypedef(yangInclude.getIncludedNode());
+            } else if (getCurrentEntityToResolveFromStack() instanceof YangUses) {
+                linkedNode = findRefGrouping(yangInclude.getIncludedNode());
+            }
+            if (linkedNode != null) {
+                // Add the link to external entity.
+                addReferredEntityLink(linkedNode, INTER_FILE_LINKED);
+                /*
+                 * Update the current reference resolver to external
+                 * module/sub-module containing the referred typedef/grouping.
+                 */
+                setCurReferenceResolver((YangReferenceResolver) yangInclude.getIncludedNode());
+                // Add the type/uses of referred typedef/grouping to the stack.
+                addUnresolvedRecursiveReferenceToStack(linkedNode);
+                return true;
+            }
+        }
+        // If referred node can't be found return false.
+        return false;
+    }
+
+    /**
+     * Finds and resolves with import list.
+     *
+     * @return true if resolved, false otherwise
+     * @throws DataModelException a violation in data model rule
+     */
+    private boolean resolveWithImport() throws DataModelException {
+        /*
+         * Run through import list to find the referred typedef/grouping.
+         */
+        for (YangImport yangImport : getCurReferenceResolver().getImportList()) {
+            /*
+             * Match the prefix attached to entity under resolution with the
+             * imported/included module/sub-module's prefix. If found, search
+             * for the referred typedef/grouping at the root level.
+             */
+            if (yangImport.getPrefixId().contentEquals(getRefPrefix())) {
+                YangNode linkedNode = null;
+                if (getCurrentEntityToResolveFromStack() instanceof YangType) {
+                    linkedNode = findRefTypedef(yangImport.getImportedNode());
+                } else if (getCurrentEntityToResolveFromStack() instanceof YangUses) {
+                    linkedNode = findRefGrouping(yangImport.getImportedNode());
+                }
+                if (linkedNode != null) {
+                    // Add the link to external entity.
+                    addReferredEntityLink(linkedNode, INTER_FILE_LINKED);
+                    /*
+                     * Update the current reference resolver to external
+                     * module/sub-module containing the referred typedef/grouping.
+                     */
+                    setCurReferenceResolver((YangReferenceResolver) yangImport.getImportedNode());
+                    // Add the type/uses of referred typedef/grouping to the stack.
+                    addUnresolvedRecursiveReferenceToStack(linkedNode);
+                    return true;
+                }
+                /*
+                 * If referred node can't be found at root level break for loop,
+                 * and return false.
+                 */
+                break;
+            }
+        }
+        // If referred node can't be found return false.
+        return false;
+    }
+
+    /**
+     * Returns referred typedef/grouping node.
+     *
+     * @return referred typedef/grouping node
+     * @throws DataModelException a violation in data model rule
+     */
+    private T getRefNode() throws DataModelException {
+        if (getCurrentEntityToResolveFromStack() instanceof YangType) {
+            YangDerivedInfo<?> derivedInfo = (YangDerivedInfo<?>)
+                    ((YangType<?>) getCurrentEntityToResolveFromStack()).getDataTypeExtendedInfo();
+            return (T) derivedInfo.getReferredTypeDef();
+        } else if (getCurrentEntityToResolveFromStack() instanceof YangUses) {
+            return (T) ((YangUses) getCurrentEntityToResolveFromStack()).getRefGroup();
+        } else {
+            throw new DataModelException("Data Model Exception: Entity to resolved is other than type/uses");
+        }
+    }
+
+    /**
+     * Finds the referred grouping node at the root level of imported/included node.
+     *
+     * @param refNode module/sub-module node
+     * @return referred grouping
+     */
+    private YangNode findRefGrouping(YangNode refNode) {
+        YangNode tmpNode = refNode.getChild();
+        while (tmpNode != null) {
+            if (tmpNode instanceof YangGrouping) {
+                if (tmpNode.getName()
+                        .equals(((YangUses) getCurrentEntityToResolveFromStack()).getName())) {
+                    return tmpNode;
+                }
+            }
+            tmpNode = tmpNode.getNextSibling();
+        }
+        return null;
+    }
+
+    /**
+     * Finds the referred typedef node at the root level of imported/included node.
+     *
+     * @param refNode module/sub-module node
+     * @return referred typedef
+     */
+    private YangNode findRefTypedef(YangNode refNode) {
+        YangNode tmpNode = refNode.getChild();
+        while (tmpNode != null) {
+            if (tmpNode instanceof YangTypeDef) {
+                if (tmpNode.getName()
+                        .equals(((YangType) getCurrentEntityToResolveFromStack()).getDataTypeName())) {
+                    return tmpNode;
+                }
+            }
+            tmpNode = tmpNode.getNextSibling();
+        }
+        return null;
+    }
 }

@@ -15,6 +15,6 @@
  */
 
 /**
- * Provide inter file and inter jar linking implementation.
+ * Provide intra/inter file and inter jar linking implementation.
  */
-package org.onosproject.yangutils.linker.impl;
\ No newline at end of file
+package org.onosproject.yangutils.linker.impl;

@@ -74,20 +74,26 @@ public final class BelongsToListener {
      * (belongsto), perform validations and update the data model tree.
      *
      * @param listener Listener's object
-     * @param ctx context object of the grammar rule
+     * @param ctx      context object of the grammar rule
      */
     public static void processBelongsToEntry(TreeWalkListener listener,
                                              GeneratedYangParser.BelongstoStatementContext ctx) {
 
         // Check for stack to be non empty.
         checkStackIsNotEmpty(listener, MISSING_HOLDER, BELONGS_TO_DATA, ctx.identifier().getText(),
-                             ENTRY);
+                ENTRY);
 
         String identifier = getValidIdentifier(ctx.identifier().getText(), BELONGS_TO_DATA, ctx);
 
         YangBelongsTo belongstoNode = new YangBelongsTo();
         belongstoNode.setBelongsToModuleName(identifier);
 
+        // Set the line number and character position in line for the belongs to.
+        int errorLine = ctx.getStart().getLine();
+        int errorPosition = ctx.getStart().getCharPositionInLine();
+        belongstoNode.setLineNumber(errorLine);
+        belongstoNode.setCharPosition(errorPosition);
+
         // Push belongsto into the stack.
         listener.getParsedDataStack().push(belongstoNode);
     }
@@ -97,14 +103,14 @@ public final class BelongsToListener {
      * validations and update the data model tree.
      *
      * @param listener Listener's object
-     * @param ctx context object of the grammar rule
+     * @param ctx      context object of the grammar rule
      */
     public static void processBelongsToExit(TreeWalkListener listener,
                                             GeneratedYangParser.BelongstoStatementContext ctx) {
 
         // Check for stack to be non empty.
         checkStackIsNotEmpty(listener, MISSING_HOLDER, BELONGS_TO_DATA, ctx.identifier().getText(),
-                             EXIT);
+                EXIT);
 
         Parsable tmpBelongstoNode = listener.getParsedDataStack().peek();
         if (tmpBelongstoNode instanceof YangBelongsTo) {
@@ -112,7 +118,7 @@ public final class BelongsToListener {
 
             // Check for stack to be empty.
             checkStackIsNotEmpty(listener, MISSING_HOLDER, BELONGS_TO_DATA,
-                                 ctx.identifier().getText(), EXIT);
+                    ctx.identifier().getText(), EXIT);
 
             Parsable tmpNode = listener.getParsedDataStack().peek();
             switch (tmpNode.getYangConstructType()) {
@@ -129,7 +135,7 @@ public final class BelongsToListener {
             }
         } else {
             throw new ParserException(constructListenerErrorMessage(MISSING_CURRENT_HOLDER, BELONGS_TO_DATA,
-                                                                    ctx.identifier().getText(), EXIT));
+                    ctx.identifier().getText(), EXIT));
         }
     }
 }

@@ -73,7 +73,7 @@ public final class ImportListener {
      * (import), perform validations and update the data model tree.
      *
      * @param listener Listener's object
-     * @param ctx context object of the grammar rule
+     * @param ctx      context object of the grammar rule
      */
     public static void processImportEntry(TreeWalkListener listener, GeneratedYangParser.ImportStatementContext ctx) {
 
@@ -85,6 +85,12 @@ public final class ImportListener {
         YangImport importNode = new YangImport();
         importNode.setModuleName(identifier);
 
+        // Set the line number and character position in line for the belongs to.
+        int errorLine = ctx.getStart().getLine();
+        int errorPosition = ctx.getStart().getCharPositionInLine();
+        importNode.setLineNumber(errorLine);
+        importNode.setCharPosition(errorPosition);
+
         // Push import node to the stack.
         listener.getParsedDataStack().push(importNode);
     }
@@ -94,7 +100,7 @@ public final class ImportListener {
      * validations and update the data model tree.
      *
      * @param listener Listener's object
-     * @param ctx context object of the grammar rule
+     * @param ctx      context object of the grammar rule
      */
     public static void processImportExit(TreeWalkListener listener, GeneratedYangParser.ImportStatementContext ctx) {
 
@@ -107,7 +113,7 @@ public final class ImportListener {
 
             // Check for stack to be non empty.
             checkStackIsNotEmpty(listener, MISSING_HOLDER, IMPORT_DATA, ctx.identifier().getText(),
-                                 EXIT);
+                    EXIT);
 
             Parsable tmpNode = listener.getParsedDataStack().peek();
             switch (tmpNode.getYangConstructType()) {
@@ -128,7 +134,7 @@ public final class ImportListener {
             }
         } else {
             throw new ParserException(constructListenerErrorMessage(MISSING_CURRENT_HOLDER, IMPORT_DATA,
-                                                                    ctx.identifier().getText(), EXIT));
+                    ctx.identifier().getText(), EXIT));
         }
     }
 }

@@ -72,19 +72,25 @@ public final class IncludeListener {
      * (include), perform validations and update the data model tree.
      *
      * @param listener Listener's object
-     * @param ctx context object of the grammar rule
+     * @param ctx      context object of the grammar rule
      */
     public static void processIncludeEntry(TreeWalkListener listener, GeneratedYangParser.IncludeStatementContext ctx) {
 
         // Check for stack to be non empty.
         checkStackIsNotEmpty(listener, MISSING_HOLDER, INCLUDE_DATA, ctx.identifier().getText(),
-                             ENTRY);
+                ENTRY);
 
         String identifier = getValidIdentifier(ctx.identifier().getText(), INCLUDE_DATA, ctx);
 
         YangInclude includeNode = new YangInclude();
         includeNode.setSubModuleName(identifier);
 
+        // Set the line number and character position in line for the belongs to.
+        int errorLine = ctx.getStart().getLine();
+        int errorPosition = ctx.getStart().getCharPositionInLine();
+        includeNode.setLineNumber(errorLine);
+        includeNode.setCharPosition(errorPosition);
+
         listener.getParsedDataStack().push(includeNode);
     }
 
@@ -93,7 +99,7 @@ public final class IncludeListener {
      * validations and update the data model tree.
      *
      * @param listener Listener's object
-     * @param ctx context object of the grammar rule
+     * @param ctx      context object of the grammar rule
      */
     public static void processIncludeExit(TreeWalkListener listener, GeneratedYangParser.IncludeStatementContext ctx) {
 
@@ -106,7 +112,7 @@ public final class IncludeListener {
 
             // Check for stack to be non empty.
             checkStackIsNotEmpty(listener, MISSING_HOLDER, INCLUDE_DATA, ctx.identifier().getText(),
-                                 EXIT);
+                    EXIT);
 
             Parsable tmpNode = listener.getParsedDataStack().peek();
             switch (tmpNode.getYangConstructType()) {
@@ -127,7 +133,7 @@ public final class IncludeListener {
             }
         } else {
             throw new ParserException(constructListenerErrorMessage(MISSING_CURRENT_HOLDER, INCLUDE_DATA,
-                                                                    ctx.identifier().getText(), EXIT));
+                    ctx.identifier().getText(), EXIT));
         }
     }
 }

@@ -16,7 +16,6 @@
 
 package org.onosproject.yangutils.parser.impl.listeners;
 
-import org.onosproject.yangutils.datamodel.YangDataTypes;
 import org.onosproject.yangutils.datamodel.YangDerivedInfo;
 import org.onosproject.yangutils.datamodel.YangRangeRestriction;
 import org.onosproject.yangutils.datamodel.YangStringRestriction;
@@ -27,7 +26,9 @@ import org.onosproject.yangutils.parser.exceptions.ParserException;
 import org.onosproject.yangutils.parser.impl.TreeWalkListener;
 import org.onosproject.yangutils.utils.YangConstructType;
 
+import static org.onosproject.yangutils.datamodel.YangDataTypes.BINARY;
 import static org.onosproject.yangutils.datamodel.YangDataTypes.DERIVED;
+import static org.onosproject.yangutils.datamodel.YangDataTypes.STRING;
 import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.ENTRY;
 import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.EXIT;
 import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction.constructListenerErrorMessage;
@@ -99,8 +100,8 @@ public final class LengthRestrictionListener {
      * Sets the length restriction to type.
      *
      * @param listener listener's object
-     * @param type Yang type for which length restriction to be set
-     * @param ctx  context object of the grammar rule
+     * @param type     Yang type for which length restriction to be set
+     * @param ctx      context object of the grammar rule
      */
     private static void setLengthRestriction(TreeWalkListener listener, YangType type,
                                              GeneratedYangParser.LengthStatementContext ctx) {
@@ -115,10 +116,10 @@ public final class LengthRestrictionListener {
             return;
         }
 
-        if (type.getDataType() != YangDataTypes.STRING) {
+        if (type.getDataType() != STRING && type.getDataType() != BINARY) {
             ParserException parserException = new ParserException("YANG file error : " +
                     YangConstructType.getYangConstructType(LENGTH_DATA) + " name " + ctx.length().getText() +
-                    " can be used to restrict the built-in type string or types derived from string.");
+                    " can be used to restrict the built-in type string/binary or types derived from string/binary.");
             parserException.setLine(ctx.getStart().getLine());
             parserException.setCharPosition(ctx.getStart().getCharPositionInLine());
             throw parserException;
@@ -127,14 +128,18 @@ public final class LengthRestrictionListener {
         YangRangeRestriction lengthRestriction = processLengthRestriction(null, ctx.getStart().getLine(),
                 ctx.getStart().getCharPositionInLine(), false, ctx.length().getText());
 
-        YangStringRestriction stringRestriction = (YangStringRestriction) type.getDataTypeExtendedInfo();
+        if (type.getDataType() == STRING) {
+            YangStringRestriction stringRestriction = (YangStringRestriction) type.getDataTypeExtendedInfo();
+            if (stringRestriction == null) {
+                stringRestriction = new YangStringRestriction();
+                type.setDataTypeExtendedInfo(stringRestriction);
+            }
 
-        if (stringRestriction == null) {
-            stringRestriction = new YangStringRestriction();
-            type.setDataTypeExtendedInfo(stringRestriction);
+            stringRestriction.setLengthRestriction(lengthRestriction);
+        } else {
+            type.setDataTypeExtendedInfo(lengthRestriction);
         }
 
-        stringRestriction.setLengthRestriction(lengthRestriction);
         listener.getParsedDataStack().push(lengthRestriction);
     }
 
@@ -143,7 +148,7 @@ public final class LengthRestrictionListener {
      * It is called when parser exits from grammar rule (length).
      *
      * @param listener listener's object
-     * @param ctx context object of the grammar rule
+     * @param ctx      context object of the grammar rule
      */
     public static void processLengthRestrictionExit(TreeWalkListener listener,
                                                    GeneratedYangParser.LengthStatementContext ctx) {

@@ -16,7 +16,7 @@
 
 package org.onosproject.yangutils.parser.impl.listeners;
 
-import org.onosproject.yangutils.datamodel.YangReferenceResolver;
+import org.onosproject.yangutils.linker.impl.YangReferenceResolver;
 import org.onosproject.yangutils.datamodel.YangModule;
 import org.onosproject.yangutils.datamodel.YangRevision;
 import org.onosproject.yangutils.datamodel.exceptions.DataModelException;

@@ -16,7 +16,7 @@
 
 package org.onosproject.yangutils.parser.impl.listeners;
 
-import org.onosproject.yangutils.datamodel.YangReferenceResolver;
+import org.onosproject.yangutils.linker.impl.YangReferenceResolver;
 import org.onosproject.yangutils.datamodel.YangRevision;
 import org.onosproject.yangutils.datamodel.YangSubModule;
 import org.onosproject.yangutils.datamodel.exceptions.DataModelException;

@@ -22,26 +22,24 @@ import org.onosproject.yangutils.datamodel.YangLeaf;
 import org.onosproject.yangutils.datamodel.YangLeafList;
 import org.onosproject.yangutils.datamodel.YangNode;
 import org.onosproject.yangutils.datamodel.YangNodeIdentifier;
-import org.onosproject.yangutils.datamodel.YangResolutionInfo;
 import org.onosproject.yangutils.datamodel.YangType;
 import org.onosproject.yangutils.datamodel.YangTypeDef;
 import org.onosproject.yangutils.datamodel.YangUnion;
 import org.onosproject.yangutils.datamodel.exceptions.DataModelException;
+import org.onosproject.yangutils.linker.impl.YangResolutionInfo;
 import org.onosproject.yangutils.parser.Parsable;
 import org.onosproject.yangutils.parser.antlrgencode.GeneratedYangParser;
 import org.onosproject.yangutils.parser.exceptions.ParserException;
 import org.onosproject.yangutils.parser.impl.TreeWalkListener;
 
-import static org.onosproject.yangutils.datamodel.ResolvableStatus.UNRESOLVED;
 import static org.onosproject.yangutils.datamodel.utils.DataModelUtils.addResolutionInfo;
 import static org.onosproject.yangutils.datamodel.utils.GeneratedLanguage.JAVA_GENERATION;
 import static org.onosproject.yangutils.datamodel.utils.YangDataModelFactory.getYangType;
+import static org.onosproject.yangutils.linker.impl.ResolvableStatus.UNRESOLVED;
 import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.ENTRY;
 import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.EXIT;
-import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction
-        .constructExtendedListenerErrorMessage;
-import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction
-        .constructListenerErrorMessage;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction.constructExtendedListenerErrorMessage;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction.constructListenerErrorMessage;
 import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.INVALID_HOLDER;
 import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.MISSING_CURRENT_HOLDER;
 import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.MISSING_HOLDER;
@@ -81,10 +79,10 @@ public final class TypeListener {
      * (type), performs validation and updates the data model tree.
      *
      * @param listener listener's object
-     * @param ctx context object of the grammar rule
+     * @param ctx      context object of the grammar rule
      */
     public static void processTypeEntry(TreeWalkListener listener,
-            GeneratedYangParser.TypeStatementContext ctx) {
+                                        GeneratedYangParser.TypeStatementContext ctx) {
 
         // Check for stack to be non empty.
         checkStackIsNotEmpty(listener, MISSING_HOLDER, TYPE_DATA, ctx.string().getText(), ENTRY);
@@ -190,6 +188,8 @@ public final class TypeListener {
                     YangDerivedInfo<?> yangDerivedInfo = new YangDerivedInfo<>();
                     ((YangType<YangDerivedInfo>) type).setDataTypeExtendedInfo(yangDerivedInfo);
 
+                    type.setResolvableStatus(UNRESOLVED);
+
                     // Add resolution information to the list
                     YangResolutionInfo resolutionInfo =
                             new YangResolutionInfo<YangType>(type, unionNode, errorLine, errorPosition);
@@ -211,13 +211,15 @@ public final class TypeListener {
                     YangDerivedInfo<?> yangDerivedInfo = new YangDerivedInfo<>();
                     ((YangType<YangDerivedInfo>) type).setDataTypeExtendedInfo(yangDerivedInfo);
 
+                    type.setResolvableStatus(UNRESOLVED);
+
                     // Add resolution information to the list
                     YangResolutionInfo resolutionInfo =
                             new YangResolutionInfo<YangType>(type, typeDef, errorLine, errorPosition);
                     addToResolutionList(resolutionInfo, ctx);
                 }
                 break;
-            //TODO: deviate replacement statement.case TYPEDEF_DATA: //TODO
+            //TODO: deviate replacement statement.
 
             default:
                 throw new ParserException(constructListenerErrorMessage(INVALID_HOLDER, TYPE_DATA,
@@ -233,10 +235,10 @@ public final class TypeListener {
      * validations and update the data model tree.
      *
      * @param listener Listener's object
-     * @param ctx context object of the grammar rule
+     * @param ctx      context object of the grammar rule
      */
     public static void processTypeExit(TreeWalkListener listener,
-            GeneratedYangParser.TypeStatementContext ctx) {
+                                       GeneratedYangParser.TypeStatementContext ctx) {
 
         // Check for stack to be non empty.
         checkStackIsNotEmpty(listener, MISSING_CURRENT_HOLDER, TYPE_DATA, ctx.string().getText(), EXIT);
@@ -252,15 +254,15 @@ public final class TypeListener {
      * Adds to resolution list.
      *
      * @param resolutionInfo resolution information
-     * @param ctx context object of the grammar rule
+     * @param ctx            context object of the grammar rule
      */
     private static void addToResolutionList(YangResolutionInfo<YangType> resolutionInfo,
-            GeneratedYangParser.TypeStatementContext ctx) {
+                                            GeneratedYangParser.TypeStatementContext ctx) {
         try {
             addResolutionInfo(resolutionInfo);
         } catch (DataModelException e) {
             throw new ParserException(constructExtendedListenerErrorMessage(UNHANDLED_PARSED_DATA,
-                    TYPE_DATA, ctx.string().getText(), EXIT, e.getMessage()));
+                    TYPE_DATA, ctx.string().getText(), ENTRY, e.getMessage()));
         }
     }
 }

@@ -26,7 +26,7 @@ import org.onosproject.yangutils.datamodel.YangNode;
 import org.onosproject.yangutils.datamodel.YangNodeIdentifier;
 import org.onosproject.yangutils.datamodel.YangNotification;
 import org.onosproject.yangutils.datamodel.YangOutput;
-import org.onosproject.yangutils.datamodel.YangResolutionInfo;
+import org.onosproject.yangutils.linker.impl.YangResolutionInfo;
 import org.onosproject.yangutils.datamodel.YangSubModule;
 import org.onosproject.yangutils.datamodel.YangUses;
 import org.onosproject.yangutils.datamodel.exceptions.DataModelException;

@@ -16,6 +16,8 @@
 
 package org.onosproject.yangutils.plugin.manager;
 
+import java.util.Objects;
+import org.onosproject.yangutils.linker.impl.ResolvableStatus;
 import org.onosproject.yangutils.datamodel.YangNode;
 
 /**
@@ -29,11 +31,21 @@ public class YangFileInfo {
     private String yangFileName;
 
     /**
+     * YANG file revision.
+     */
+    private String revision;
+
+    /**
      * Data model node after parsing YANG file.
      */
     private YangNode rootNode;
 
     /**
+     * Resolution status of YANG file.
+     */
+    private ResolvableStatus resolvableStatus;
+
+    /**
      * Returns data model node for YANG file.
      *
      * @return data model node for YANG file
@@ -68,4 +80,58 @@ public class YangFileInfo {
     public void setYangFileName(String yangFileName) {
         this.yangFileName = yangFileName;
     }
+
+    /**
+     * Returns the revision of YANG file.
+     *
+     * @return revision of YANG file
+     */
+    public String getRevision() {
+        return revision;
+    }
+
+    /**
+     * Sets the revision of YANG file.
+     *
+     * @param revision revision of YANG file
+     */
+    public void setRevision(String revision) {
+        this.revision = revision;
+    }
+
+    /**
+     * Returns the resolution status of YANG file.
+     *
+     * @return resolution status of YANG file
+     */
+    public ResolvableStatus getResolvableStatus() {
+        return resolvableStatus;
+    }
+
+    /**
+     * Sets the resolution status of YANG file.
+     *
+     * @param resolvableStatus resolution status of YANG file
+     */
+    public void setResolvableStatus(ResolvableStatus resolvableStatus) {
+        this.resolvableStatus = resolvableStatus;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+
+        if (this == obj) {
+            return true;
+        }
+        if (obj instanceof YangFileInfo) {
+            final YangFileInfo other = (YangFileInfo) obj;
+            return Objects.equals(this.yangFileName, other.yangFileName);
+        }
+        return false;
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hashCode(this.yangFileName);
+    }
 }

@@ -17,9 +17,10 @@
 package org.onosproject.yangutils.plugin.manager;
 
 import java.io.IOException;
+import java.util.HashSet;
 import java.util.Iterator;
 import java.util.List;
-
+import java.util.Set;
 import org.apache.maven.plugin.AbstractMojo;
 import org.apache.maven.plugin.MojoExecutionException;
 import org.apache.maven.plugin.MojoFailureException;
@@ -28,8 +29,9 @@ import org.apache.maven.plugins.annotations.Mojo;
 import org.apache.maven.plugins.annotations.Parameter;
 import org.apache.maven.project.MavenProject;
 import org.onosproject.yangutils.datamodel.YangNode;
-import org.onosproject.yangutils.datamodel.YangSubModule;
-import org.onosproject.yangutils.datamodel.exceptions.DataModelException;
+import org.onosproject.yangutils.linker.YangLinker;
+import org.onosproject.yangutils.linker.exceptions.LinkerException;
+import org.onosproject.yangutils.linker.impl.YangLinkerManager;
 import org.onosproject.yangutils.parser.YangUtilsParser;
 import org.onosproject.yangutils.parser.exceptions.ParserException;
 import org.onosproject.yangutils.parser.impl.YangUtilsParserManager;
@@ -48,10 +50,9 @@ import static org.onosproject.yangutils.utils.UtilConstants.DEFAULT_BASE_PKG;
 import static org.onosproject.yangutils.utils.UtilConstants.NEW_LINE;
 import static org.onosproject.yangutils.utils.UtilConstants.SLASH;
 import static org.onosproject.yangutils.utils.io.impl.YangIoUtils.addToSource;
-import static org.onosproject.yangutils.utils.io.impl.YangIoUtils.deleteDirectory;
 import static org.onosproject.yangutils.utils.io.impl.YangIoUtils.copyYangFilesToTarget;
+import static org.onosproject.yangutils.utils.io.impl.YangIoUtils.deleteDirectory;
 import static org.onosproject.yangutils.utils.io.impl.YangIoUtils.getDirectory;
-import static org.onosproject.yangutils.datamodel.utils.DataModelUtils.findBelongsToModuleNode;
 
 /**
  * Represents ONOS YANG utility maven plugin.
@@ -63,6 +64,14 @@ import static org.onosproject.yangutils.datamodel.utils.DataModelUtils.findBelon
         requiresProject = true)
 public class YangUtilManager extends AbstractMojo {
 
+    private YangNode rootNode;
+    // YANG file information set.
+    private Set<YangFileInfo> yangFileInfoSet = new HashSet<>();
+    private YangUtilsParser yangUtilsParser = new YangUtilsParserManager();
+    private YangLinker yangLinker = new YangLinkerManager();
+
+    private static final String DEFAULT_PKG = SLASH + getPackageDirPathFromJavaJPackage(DEFAULT_BASE_PKG);
+
     /**
      * Source directory for YANG files.
      */
@@ -117,12 +126,6 @@ public class YangUtilManager extends AbstractMojo {
     @Component
     private BuildContext context;
 
-    private static final String DEFAULT_PKG = SLASH
-            + getPackageDirPathFromJavaJPackage(DEFAULT_BASE_PKG);
-
-    private YangUtilsParser yangUtilsParser = new YangUtilsParserManager();
-    private YangNode rootNode;
-
     @Override
     public void execute() throws MojoExecutionException, MojoFailureException {
 
@@ -136,47 +139,40 @@ public class YangUtilManager extends AbstractMojo {
 
             String searchDir = getDirectory(baseDir, yangFilesDir);
             String codeGenDir = getDirectory(baseDir, genFilesDir) + SLASH;
+
+            // Creates conflict resolver and set values to it.
             YangToJavaNamingConflictUtil conflictResolver = new YangToJavaNamingConflictUtil();
             conflictResolver.setReplacementForPeriod(replacementForPeriod);
             conflictResolver.setReplacementForHyphen(replacementForHyphen);
             conflictResolver.setReplacementForUnderscore(replacementForUnderscore);
-            List<YangFileInfo> yangFileInfo = YangFileScanner.getYangFiles(searchDir);
-            if (yangFileInfo == null || yangFileInfo.isEmpty()) {
-                // no files to translate
-                return;
-            }
             YangPluginConfig yangPlugin = new YangPluginConfig();
             yangPlugin.setCodeGenDir(codeGenDir);
             yangPlugin.setConflictResolver(conflictResolver);
 
-            Iterator<YangFileInfo> yangFileIterator = yangFileInfo.iterator();
-            while (yangFileIterator.hasNext()) {
-                YangFileInfo yangFile = yangFileIterator.next();
-                try {
-                    YangNode yangNode = yangUtilsParser.getDataModel(yangFile.getYangFileName());
-                    yangFile.setRootNode(yangNode);
-                    setRootNode(yangNode);
-                } catch (ParserException e) {
-                    String logInfo = "Error in file: " + e.getFileName();
-                    if (e.getLineNumber() != 0) {
-                        logInfo = logInfo + " at line: " + e.getLineNumber() + " at position: "
-                                + e.getCharPositionInLine();
-
-                    }
-                    if (e.getMessage() != null) {
-                        logInfo = logInfo + NEW_LINE + e.getMessage();
-                    }
-                    getLog().info(logInfo);
-                    throw e;
-                }
+            /*
+             * Obtain the YANG files at a path mentioned in plugin and creates
+             * YANG file information set.
+             */
+            createYangFileInfoSet(YangFileScanner.getYangFiles(searchDir));
+
+            // Check if there are any file to translate, if not return.
+            if (getYangFileInfoSet() == null || getYangFileInfoSet().isEmpty()) {
+                // No files to translate
+                return;
             }
 
-            resolveLinkingForSubModule(yangFileInfo);
+            //Carry out the parsing for all the YANG files.
+            parseYangFileInfoSet();
+
+            // Resolve dependencies using linker.
+            resolveDependenciesUsingLinker();
 
-            translateToJava(yangFileInfo, yangPlugin);
+            // Perform translation to JAVA.
+            translateToJava(getYangFileInfoSet(), yangPlugin);
 
             addToSource(getDirectory(baseDir, genFilesDir) + DEFAULT_PKG, project, context);
-            copyYangFilesToTarget(yangFileInfo, getDirectory(baseDir, outputDirectory), project);
+
+            copyYangFilesToTarget(getYangFileInfoSet(), getDirectory(baseDir, outputDirectory), project);
         } catch (Exception e) {
             String fileName = "";
             if (e instanceof TranslatorException) {
@@ -196,22 +192,45 @@ public class YangUtilManager extends AbstractMojo {
     }
 
     /**
-     * Set current project.
+     * Links all the provided with the YANG file info set.
      *
-     * @param curProject maven project
+     * @throws MojoExecutionException a violation in mojo excecution
      */
-    public void setCurrentProject(MavenProject curProject) {
-        project = curProject;
-
+    public void resolveDependenciesUsingLinker() throws MojoExecutionException {
+        for (YangFileInfo yangFileInfo : getYangFileInfoSet()) {
+            try {
+                yangLinker.resolveDependencies(getYangFileInfoSet());
+            } catch (LinkerException e) {
+                throw new MojoExecutionException(e.getMessage());
+            }
+        }
     }
 
     /**
-     * Returns current project.
+     * Parses all the provided YANG files and generates YANG data model tree.
      *
-     * @return current project
+     * @throws IOException a violation in IO
      */
-    public MavenProject getCurrentProject() {
-        return project;
+    public void parseYangFileInfoSet() throws IOException {
+        for (YangFileInfo yangFileInfo : getYangFileInfoSet()) {
+            try {
+                YangNode yangNode = yangUtilsParser.getDataModel(yangFileInfo.getYangFileName());
+                yangFileInfo.setRootNode(yangNode);
+                setRootNode(yangNode);
+            } catch (ParserException e) {
+                String logInfo = "Error in file: " + e.getFileName();
+                if (e.getLineNumber() != 0) {
+                    logInfo = logInfo + " at line: " + e.getLineNumber() + " at position: "
+                            + e.getCharPositionInLine();
+
+                }
+                if (e.getMessage() != null) {
+                    logInfo = logInfo + NEW_LINE + e.getMessage();
+                }
+                getLog().info(logInfo);
+                throw e;
+            }
+        }
     }
 
     /**
@@ -219,7 +238,7 @@ public class YangUtilManager extends AbstractMojo {
      *
      * @return current root YANG node of data-model tree
      */
-    public YangNode getRootNode() {
+    private YangNode getRootNode() {
         return rootNode;
     }
 
@@ -228,44 +247,55 @@ public class YangUtilManager extends AbstractMojo {
      *
      * @param rootNode current root YANG node of data-model tree
      */
-    public void setRootNode(YangNode rootNode) {
+    private void setRootNode(YangNode rootNode) {
         this.rootNode = rootNode;
     }
 
     /**
      * Translates to java code corresponding to the YANG schema.
      *
-     * @param yangFileInfo YANG file information
-     * @param yangPlugin YANG plugin config
+     * @param yangFileInfoSet YANG file information
+     * @param yangPlugin      YANG plugin config
      * @throws IOException when fails to generate java code file the current
-     *             node
+     *                     node
      */
-    public static void translateToJava(List<YangFileInfo> yangFileInfo, YangPluginConfig yangPlugin)
+    public void translateToJava(Set<YangFileInfo> yangFileInfoSet, YangPluginConfig yangPlugin)
             throws IOException {
-        Iterator<YangFileInfo> yangFileIterator = yangFileInfo.iterator();
+        Iterator<YangFileInfo> yangFileIterator = yangFileInfoSet.iterator();
         while (yangFileIterator.hasNext()) {
-            YangFileInfo yangFile = yangFileIterator.next();
-            generateJavaCode(yangFile.getRootNode(), yangPlugin, yangFile.getYangFileName());
+            YangFileInfo yangFileInfo = yangFileIterator.next();
+            generateJavaCode(yangFileInfo.getRootNode(), yangPlugin, yangFileInfo.getYangFileName());
         }
     }
 
     /**
-     * Resolves sub-module linking.
+     * Creates a YANG file info set.
      *
-     * @param yangFileInfo YANG file information
-     * @throws DataModelException when belongs-to module node is not found
+     * @param yangFileList YANG files list
      */
-    public static void resolveLinkingForSubModule(List<YangFileInfo> yangFileInfo) throws DataModelException {
-        Iterator<YangFileInfo> yangFileIterator = yangFileInfo.iterator();
-        while (yangFileIterator.hasNext()) {
-            YangFileInfo yangFile = yangFileIterator.next();
-            YangNode yangNode = yangFile.getRootNode();
-            if (yangNode instanceof YangSubModule) {
-                String belongsToModuleName = ((YangSubModule) yangNode).getBelongsTo()
-                        .getBelongsToModuleName();
-                YangNode moduleNode = findBelongsToModuleNode(yangFileInfo, belongsToModuleName);
-                ((YangSubModule) yangNode).getBelongsTo().setModuleNode(moduleNode);
-            }
+    public void createYangFileInfoSet(List<String> yangFileList) {
+        for (String yangFile : yangFileList) {
+            YangFileInfo yangFileInfo = new YangFileInfo();
+            yangFileInfo.setYangFileName(yangFile);
+            getYangFileInfoSet().add(yangFileInfo);
         }
     }
+
+    /**
+     * Returns the YANG file info set.
+     *
+     * @return the YANG file info set
+     */
+    public Set<YangFileInfo> getYangFileInfoSet() {
+        return yangFileInfoSet;
+    }
+
+    /**
+     * Sets the YANG file info set.
+     *
+     * @param yangFileInfoSet the YANG file info set
+     */
+    public void setYangFileInfoSet(Set<YangFileInfo> yangFileInfoSet) {
+        this.yangFileInfoSet = yangFileInfoSet;
+    }
 }

@@ -16,7 +16,6 @@
 package org.onosproject.yangutils.translator.tojava.javamodel;
 
 import java.io.IOException;
-
 import org.onosproject.yangutils.datamodel.YangBelongsTo;
 import org.onosproject.yangutils.datamodel.YangModule;
 import org.onosproject.yangutils.datamodel.YangSubModule;
@@ -105,10 +104,10 @@ public class YangJavaSubModule
      * Returns the name space of the module to which the sub module belongs to.
      *
      * @param belongsToInfo Information of the module to which the sub module
-     * belongs
+     *                      belongs
      * @return the name space string of the module.
      */
-    private String getNameSpaceFromModule(YangBelongsTo belongsToInfo) {
+    public String getNameSpaceFromModule(YangBelongsTo belongsToInfo) {
         return ((YangModule) belongsToInfo.getModuleNode()).getNameSpace().getUri();
     }
 

@@ -24,14 +24,17 @@ import org.onosproject.yangutils.datamodel.YangType;
 import org.onosproject.yangutils.datamodel.YangTypeDef;
 import org.onosproject.yangutils.datamodel.YangUnion;
 import org.onosproject.yangutils.translator.exception.TranslatorException;
-import org.onosproject.yangutils.translator.tojava.JavaFileInfoContainer;
 import org.onosproject.yangutils.translator.tojava.JavaFileInfo;
+import org.onosproject.yangutils.translator.tojava.JavaFileInfoContainer;
 import org.onosproject.yangutils.translator.tojava.javamodel.YangJavaEnumeration;
+import org.onosproject.yangutils.translator.tojava.javamodel.YangJavaModule;
+import org.onosproject.yangutils.translator.tojava.javamodel.YangJavaSubModule;
 import org.onosproject.yangutils.translator.tojava.javamodel.YangJavaTypeDef;
 import org.onosproject.yangutils.translator.tojava.javamodel.YangJavaUnion;
 
 import static org.onosproject.yangutils.translator.tojava.utils.JavaIdentifierSyntax.getCamelCase;
 import static org.onosproject.yangutils.translator.tojava.utils.JavaIdentifierSyntax.getCapitalCase;
+import static org.onosproject.yangutils.translator.tojava.utils.JavaIdentifierSyntax.getRootPackage;
 import static org.onosproject.yangutils.utils.UtilConstants.BIG_INTEGER;
 import static org.onosproject.yangutils.utils.UtilConstants.BOOLEAN_DATA_TYPE;
 import static org.onosproject.yangutils.utils.UtilConstants.BOOLEAN_WRAPPER;
@@ -109,7 +112,7 @@ public final class AttributesJavaDataType {
      * Returns from string method parsed string.
      *
      * @param targetDataType target data type
-     * @param yangType YANG type
+     * @param yangType       YANG type
      * @return parsed string
      */
     public static String getParseFromStringMethod(String targetDataType, YangType<?> yangType) {
@@ -155,7 +158,7 @@ public final class AttributesJavaDataType {
     /**
      * Returns java import class.
      *
-     * @param yangType YANG type
+     * @param yangType   YANG type
      * @param isListAttr if the attribute need to be a list
      * @return java import class
      */
@@ -260,9 +263,9 @@ public final class AttributesJavaDataType {
     /**
      * Returns java import package.
      *
-     * @param yangType YANG type
+     * @param yangType   YANG type
      * @param isListAttr if the attribute is of list type
-     * @param classInfo java import class info
+     * @param classInfo  java import class info
      * @return java import package
      */
     public static String getJavaImportPackage(YangType<?> yangType, boolean isListAttr, String classInfo) {
@@ -424,6 +427,20 @@ public final class AttributesJavaDataType {
             throw new TranslatorException("invalid child node is being processed.");
         }
         JavaFileInfo parentInfo = ((JavaFileInfoContainer) parent).getJavaFileInfo();
+        if (parentInfo.getPackage() == null) {
+            if (parent instanceof YangJavaModule) {
+                YangJavaModule module = (YangJavaModule) parent;
+                String modulePkg = getRootPackage(module.getVersion(), module.getNameSpace().getUri(), module
+                        .getRevision().getRevDate());
+                return modulePkg + PERIOD + getCamelCase(module.getName(), null).toLowerCase();
+            } else if (parent instanceof YangJavaSubModule) {
+                YangJavaSubModule submodule = (YangJavaSubModule) parent;
+                String subModulePkg = getRootPackage(submodule.getVersion(),
+                        submodule.getNameSpaceFromModule(submodule.getBelongsTo()),
+                        submodule.getRevision().getRevDate());
+                return subModulePkg + PERIOD + getCamelCase(submodule.getName(), null).toLowerCase();
+            }
+        }
         return parentInfo.getPackage() + PERIOD + parentInfo.getJavaName().toLowerCase();
     }
 }

@@ -21,7 +21,6 @@ import java.io.IOException;
 import java.util.LinkedList;
 import java.util.List;
 import java.util.Stack;
-import org.onosproject.yangutils.plugin.manager.YangFileInfo;
 
 /**
  * Represents utility for searching the files in a directory.
@@ -43,8 +42,8 @@ public final class YangFileScanner {
      * @param root specified directory
      * @return list of java files
      * @throws NullPointerException when no files are there.
-     * @throws IOException when files get deleted while performing the
-     *             operations
+     * @throws IOException          when files get deleted while performing the
+     *                              operations
      */
     public static List<String> getJavaFiles(String root) throws IOException {
 
@@ -52,33 +51,27 @@ public final class YangFileScanner {
     }
 
     /**
-     * Returns the list of YANG file information.
+     * Returns the list of YANG file.
      *
      * @param root specified directory
      * @return list of YANG file information
      * @throws NullPointerException when no files are there
-     * @throws IOException when files get deleted while performing the
-     *             operations
+     * @throws IOException          when files get deleted while performing the
+     *                              operations
      */
-    public static List<YangFileInfo> getYangFiles(String root) throws IOException {
+    public static List<String> getYangFiles(String root) throws IOException {
         List<String> yangFiles = getFiles(root, YANG_FILE_EXTENTION);
-        List<YangFileInfo> fileInfo = new LinkedList<>();
-        for (String yangFile : yangFiles) {
-            YangFileInfo yangFileInfo = new YangFileInfo();
-            yangFileInfo.setYangFileName(yangFile);
-            fileInfo.add(yangFileInfo);
-        }
-        return fileInfo;
+        return yangFiles;
     }
 
     /**
      * Returns the list of required files.
      *
-     * @param root specified directory
+     * @param root      specified directory
      * @param extension file extension
      * @return list of required files
      * @throws NullPointerException when no file is there
-     * @throws IOException when files get deleted while performing the operations
+     * @throws IOException          when files get deleted while performing the operations
      */
     public static List<String> getFiles(String root, String extension) throws IOException {
 

@@ -23,18 +23,20 @@ import java.io.IOException;
 import java.nio.file.Files;
 import java.nio.file.StandardCopyOption;
 import java.util.ArrayList;
-import java.util.LinkedList;
 import java.util.Iterator;
 import java.util.List;
+import java.util.LinkedList;
 import java.util.Stack;
+import java.util.Set;
 
 import org.apache.commons.io.FileUtils;
 import org.apache.maven.model.Resource;
 import org.apache.maven.project.MavenProject;
+import org.onosproject.yangutils.plugin.manager.YangFileInfo;
+
 import org.slf4j.Logger;
 import org.sonatype.plexus.build.incremental.BuildContext;
 
-import org.onosproject.yangutils.plugin.manager.YangFileInfo;
 import static org.onosproject.yangutils.utils.UtilConstants.COMMA;
 import static org.onosproject.yangutils.utils.UtilConstants.EMPTY_STRING;
 import static org.onosproject.yangutils.utils.UtilConstants.NEW_LINE;
@@ -81,9 +83,9 @@ public final class YangIoUtils {
     /**
      * Adds package info file for the created directory.
      *
-     * @param path directory path
-     * @param classInfo class info for the package
-     * @param pack package of the directory
+     * @param path        directory path
+     * @param classInfo   class info for the package
+     * @param pack        package of the directory
      * @param isChildNode is it a child node
      * @throws IOException when fails to create package info file
      */
@@ -167,7 +169,7 @@ public final class YangIoUtils {
     /**
      * Adds generated source directory to the compilation root.
      *
-     * @param source directory
+     * @param source  directory
      * @param project current maven project
      * @param context current build context
      */
@@ -180,7 +182,7 @@ public final class YangIoUtils {
     /**
      * Removes extra char from the string.
      *
-     * @param valueString string to be trimmed
+     * @param valueString    string to be trimmed
      * @param removealStirng extra chars
      * @return new string
      */
@@ -215,8 +217,8 @@ public final class YangIoUtils {
      * Returns the directory path of the package in canonical form.
      *
      * @param baseCodeGenPath base path where the generated files needs to be
-     *            put
-     * @param pathOfJavaPkg java package of the file being generated
+     *                        put
+     * @param pathOfJavaPkg   java package of the file being generated
      * @return absolute path of the package in canonical form
      */
     public static String getDirectory(String baseCodeGenPath, String pathOfJavaPkg) {
@@ -236,8 +238,8 @@ public final class YangIoUtils {
      * Returns the absolute path of the package in canonical form.
      *
      * @param baseCodeGenPath base path where the generated files needs to be
-     *            put
-     * @param pathOfJavaPkg java package of the file being generated
+     *                        put
+     * @param pathOfJavaPkg   java package of the file being generated
      * @return absolute path of the package in canonical form
      */
     public static String getAbsolutePackagePath(String baseCodeGenPath, String pathOfJavaPkg) {
@@ -247,12 +249,12 @@ public final class YangIoUtils {
     /**
      * Copies YANG files to the current project's output directory.
      *
-     * @param yangFileInfo list of YANG files
-     * @param outputDir project's output directory
-     * @param project maven project
+     * @param yangFileInfo set of YANG files
+     * @param outputDir    project's output directory
+     * @param project      maven project
      * @throws IOException when fails to copy files to destination resource directory
      */
-    public static void copyYangFilesToTarget(List<YangFileInfo> yangFileInfo, String outputDir, MavenProject project)
+    public static void copyYangFilesToTarget(Set<YangFileInfo> yangFileInfo, String outputDir, MavenProject project)
             throws IOException {
 
         List<File> files = getListOfFile(yangFileInfo);
@@ -274,10 +276,10 @@ public final class YangIoUtils {
     /**
      * Provides a list of files from list of strings.
      *
-     * @param yangFileInfo list of yang file information
+     * @param yangFileInfo set of yang file information
      * @return list of files
      */
-    private static List<File> getListOfFile(List<YangFileInfo> yangFileInfo) {
+    private static List<File> getListOfFile(Set<YangFileInfo> yangFileInfo) {
         List<File> files = new ArrayList<>();
         Iterator<YangFileInfo> yangFileIterator = yangFileInfo.iterator();
         while (yangFileIterator.hasNext()) {
@@ -291,7 +293,7 @@ public final class YangIoUtils {
      * Merges the temp java files to main java files.
      *
      * @param appendFile temp file
-     * @param srcFile main file
+     * @param srcFile    main file
      * @throws IOException when fails to append contents
      */
     public static void mergeJavaFiles(File appendFile, File srcFile) throws IOException {

+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.linker;
+
+import java.io.IOException;
+import java.util.Iterator;
+import java.util.ListIterator;
+import org.apache.maven.plugin.MojoExecutionException;
+import org.junit.Test;
+import org.onosproject.yangutils.datamodel.YangDataTypes;
+import org.onosproject.yangutils.datamodel.YangDerivedInfo;
+import org.onosproject.yangutils.datamodel.YangGrouping;
+import org.onosproject.yangutils.datamodel.YangLeaf;
+import org.onosproject.yangutils.datamodel.YangModule;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.datamodel.YangNodeType;
+import org.onosproject.yangutils.datamodel.YangTypeDef;
+import org.onosproject.yangutils.datamodel.YangUses;
+import org.onosproject.yangutils.linker.impl.ResolvableStatus;
+import org.onosproject.yangutils.linker.impl.YangLinkerManager;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.YangUtilsParserManager;
+import org.onosproject.yangutils.plugin.manager.YangFileInfo;
+import org.onosproject.yangutils.plugin.manager.YangUtilManager;
+import org.onosproject.yangutils.utils.io.impl.YangFileScanner;
+
+import static org.hamcrest.CoreMatchers.nullValue;
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.core.Is.is;
+import static org.onosproject.yangutils.datamodel.YangDataTypes.DERIVED;
+import static org.onosproject.yangutils.datamodel.YangDataTypes.STRING;
+import static org.onosproject.yangutils.datamodel.YangNodeType.MODULE_NODE;
+import static org.onosproject.yangutils.linker.impl.ResolvableStatus.RESOLVED;
+
+/**
+ * Test cases for testing inter file linking.
+ */
+public class InterFileLinkingTest {
+
+    private final YangUtilsParserManager manager = new YangUtilsParserManager();
+    private final YangUtilManager utilManager = new YangUtilManager();
+    private final YangLinkerManager yangLinkerManager = new YangLinkerManager();
+
+    /**
+     * Checks inter file type linking.
+     */
+    @Test
+    public void processInterFileTypeLinking()
+            throws IOException, ParserException, MojoExecutionException {
+
+        String searchDir = "src/test/resources/interfiletype";
+        utilManager.createYangFileInfoSet(YangFileScanner.getYangFiles(searchDir));
+        utilManager.parseYangFileInfoSet();
+
+        YangNode refNode = null;
+        YangNode selfNode = null;
+
+        // Add references to import list.
+        yangLinkerManager.addRefToYangFilesImportList(utilManager.getYangFileInfoSet());
+
+        // Carry out inter-file linking.
+        yangLinkerManager.processInterFileLinking(utilManager.getYangFileInfoSet());
+
+        Iterator<YangFileInfo> yangFileInfoIterator = utilManager.getYangFileInfoSet().iterator();
+
+        YangFileInfo yangFileInfo = yangFileInfoIterator.next();
+
+        if (yangFileInfo.getRootNode().getName().equals("module1")) {
+            selfNode = yangFileInfo.getRootNode();
+            refNode = yangFileInfoIterator.next().getRootNode();
+        } else {
+            refNode = yangFileInfo.getRootNode();
+            selfNode = yangFileInfoIterator.next().getRootNode();
+        }
+
+        // Check whether the data model tree returned is of type module.
+        assertThat(selfNode instanceof YangModule, is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(selfNode.getNodeType(), is(MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) selfNode;
+        assertThat(yangNode.getName(), is("module1"));
+
+        ListIterator<YangLeaf> leafIterator = yangNode.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        assertThat(leafInfo.getName(), is("invalid-interval"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("hello"));
+        assertThat(leafInfo.getDataType().getDataType(), is(DERIVED));
+
+        assertThat(((YangDerivedInfo<?>) leafInfo.getDataType().getDataTypeExtendedInfo()).getReferredTypeDef(),
+                is((YangTypeDef) refNode.getChild()));
+
+        assertThat(leafInfo.getDataType().getResolvableStatus(), is(RESOLVED));
+
+        YangDerivedInfo<?> derivedInfo = (YangDerivedInfo<?>) leafInfo.getDataType().getDataTypeExtendedInfo();
+
+        // Check for the effective built-in type.
+        assertThat(derivedInfo.getEffectiveBuiltInType(), is(STRING));
+
+        // Check for the restriction.
+        assertThat(derivedInfo.getLengthRestrictionString(), is(nullValue()));
+        assertThat(derivedInfo.getRangeRestrictionString(), is(nullValue()));
+        assertThat(derivedInfo.getPatternRestriction(), is(nullValue()));
+        assertThat(derivedInfo.getResolvedExtendedInfo(), is(nullValue()));
+    }
+
+    /**
+     * Checks inter file uses linking.
+     */
+    @Test
+    public void processInterFileUsesLinking()
+            throws IOException, ParserException, MojoExecutionException {
+
+        String searchDir = "src/test/resources/interfileuses";
+        utilManager.createYangFileInfoSet(YangFileScanner.getYangFiles(searchDir));
+        utilManager.parseYangFileInfoSet();
+
+        YangNode refNode = null;
+        YangNode selfNode = null;
+
+        // Add references to import list.
+        yangLinkerManager.addRefToYangFilesImportList(utilManager.getYangFileInfoSet());
+
+        // Carry out inter-file linking.
+        yangLinkerManager.processInterFileLinking(utilManager.getYangFileInfoSet());
+
+        Iterator<YangFileInfo> yangFileInfoIterator = utilManager.getYangFileInfoSet().iterator();
+
+        YangFileInfo yangFileInfo = yangFileInfoIterator.next();
+
+        if (yangFileInfo.getRootNode().getName().equals("module1")) {
+            selfNode = yangFileInfo.getRootNode();
+            refNode = yangFileInfoIterator.next().getRootNode();
+        } else {
+            refNode = yangFileInfo.getRootNode();
+            selfNode = yangFileInfoIterator.next().getRootNode();
+        }
+
+        // Check whether the data model tree returned is of type module.
+        assertThat((selfNode instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(selfNode.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) selfNode;
+        assertThat(yangNode.getName(), is("module1"));
+
+        ListIterator<YangLeaf> leafIterator;
+        YangLeaf leafInfo;
+
+        // Check whether grouping is the sibling of module's child.
+        assertThat((refNode.getChild() instanceof YangGrouping), is(true));
+
+        YangGrouping grouping = (YangGrouping) refNode.getChild();
+        leafIterator = grouping.getListOfLeaf().listIterator();
+        leafInfo = leafIterator.next();
+
+        // Check whether the information in the leaf is correct under grouping.
+        assertThat(leafInfo.getName(), is("hello"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("string"));
+        assertThat(leafInfo.getDataType().getDataType(), is(YangDataTypes.STRING));
+
+        // Check whether uses is module's child.
+        assertThat((yangNode.getChild() instanceof YangUses), is(true));
+        YangUses uses = (YangUses) yangNode.getChild();
+
+        // Check whether uses get resolved.
+        assertThat(uses.getResolvableStatus(),
+                is(ResolvableStatus.RESOLVED));
+
+        leafIterator = yangNode.getListOfLeaf().listIterator();
+        leafInfo = leafIterator.next();
+
+        // Check whether the information in the leaf is correct under module.
+        assertThat(leafInfo.getName(), is("hello"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("string"));
+        assertThat(leafInfo.getDataType().getDataType(), is(YangDataTypes.STRING));
+    }
+
+    /**
+     * Checks inter file type linking with include list.
+     */
+    @Test
+    public void processInterFileTypeLinkingWithIncludeList()
+            throws IOException, ParserException, MojoExecutionException {
+
+        String searchDir = "src/test/resources/interfiletypewithinclude";
+        utilManager.createYangFileInfoSet(YangFileScanner.getYangFiles(searchDir));
+        utilManager.parseYangFileInfoSet();
+
+        YangNode refNode = null;
+        YangNode selfNode = null;
+
+        // Carry out linking of sub module with module.
+        yangLinkerManager.linkSubModulesToParentModule(utilManager.getYangFileInfoSet());
+
+        // Add reference to include list.
+        yangLinkerManager.addRefToYangFilesIncludeList(utilManager.getYangFileInfoSet());
+
+        // Carry out inter-file linking.
+        yangLinkerManager.processInterFileLinking(utilManager.getYangFileInfoSet());
+
+        Iterator<YangFileInfo> yangFileInfoIterator = utilManager.getYangFileInfoSet().iterator();
+
+        YangFileInfo yangFileInfo = yangFileInfoIterator.next();
+
+        if (yangFileInfo.getRootNode().getName().equals("module1")) {
+            selfNode = yangFileInfo.getRootNode();
+            refNode = yangFileInfoIterator.next().getRootNode();
+        } else {
+            refNode = yangFileInfo.getRootNode();
+            selfNode = yangFileInfoIterator.next().getRootNode();
+        }
+
+        // Check whether the data model tree returned is of type module.
+        assertThat(selfNode instanceof YangModule, is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(selfNode.getNodeType(), is(MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) selfNode;
+        assertThat(yangNode.getName(), is("module1"));
+
+        ListIterator<YangLeaf> leafIterator = yangNode.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        assertThat(leafInfo.getName(), is("invalid-interval"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("hello"));
+        assertThat(leafInfo.getDataType().getDataType(), is(DERIVED));
+
+        assertThat(((YangDerivedInfo<?>) leafInfo.getDataType().getDataTypeExtendedInfo()).getReferredTypeDef(),
+                is((YangTypeDef) refNode.getChild()));
+
+        assertThat(leafInfo.getDataType().getResolvableStatus(), is(RESOLVED));
+
+        YangDerivedInfo<?> derivedInfo = (YangDerivedInfo<?>) leafInfo.getDataType().getDataTypeExtendedInfo();
+
+        // Check for the effective built-in type.
+        assertThat(derivedInfo.getEffectiveBuiltInType(), is(STRING));
+
+        // Check for the restriction.
+        assertThat(derivedInfo.getLengthRestrictionString(), is(nullValue()));
+        assertThat(derivedInfo.getRangeRestrictionString(), is(nullValue()));
+        assertThat(derivedInfo.getPatternRestriction(), is(nullValue()));
+        assertThat(derivedInfo.getResolvedExtendedInfo(), is(nullValue()));
+    }
+
+    /**
+     * Checks inter file uses linking with include list.
+     */
+    @Test
+    public void processInterFileUsesLinkingWithInclude()
+            throws IOException, ParserException, MojoExecutionException {
+
+        String searchDir = "src/test/resources/interfileuseswithinclude";
+        utilManager.createYangFileInfoSet(YangFileScanner.getYangFiles(searchDir));
+        utilManager.parseYangFileInfoSet();
+
+        YangNode refNode = null;
+        YangNode selfNode = null;
+
+        // Carry out linking of sub module with module.
+        yangLinkerManager.linkSubModulesToParentModule(utilManager.getYangFileInfoSet());
+
+        // Add reference to include list.
+        yangLinkerManager.addRefToYangFilesIncludeList(utilManager.getYangFileInfoSet());
+
+        // Carry out inter-file linking.
+        yangLinkerManager.processInterFileLinking(utilManager.getYangFileInfoSet());
+
+        Iterator<YangFileInfo> yangFileInfoIterator = utilManager.getYangFileInfoSet().iterator();
+
+        YangFileInfo yangFileInfo = yangFileInfoIterator.next();
+
+        if (yangFileInfo.getRootNode().getName().equals("module1")) {
+            selfNode = yangFileInfo.getRootNode();
+            refNode = yangFileInfoIterator.next().getRootNode();
+        } else {
+            refNode = yangFileInfo.getRootNode();
+            selfNode = yangFileInfoIterator.next().getRootNode();
+        }
+
+        // Check whether the data model tree returned is of type module.
+        assertThat((selfNode instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(selfNode.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) selfNode;
+        assertThat(yangNode.getName(), is("module1"));
+
+        ListIterator<YangLeaf> leafIterator;
+        YangLeaf leafInfo;
+
+        // Check whether grouping is the sibling of module's child.
+        assertThat((refNode.getChild() instanceof YangGrouping), is(true));
+
+        YangGrouping grouping = (YangGrouping) refNode.getChild();
+        leafIterator = grouping.getListOfLeaf().listIterator();
+        leafInfo = leafIterator.next();
+
+        // Check whether the information in the leaf is correct under grouping.
+        assertThat(leafInfo.getName(), is("hello"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("string"));
+        assertThat(leafInfo.getDataType().getDataType(), is(YangDataTypes.STRING));
+
+        // Check whether uses is module's child.
+        assertThat((yangNode.getChild() instanceof YangUses), is(true));
+        YangUses uses = (YangUses) yangNode.getChild();
+
+        // Check whether uses get resolved.
+        assertThat(uses.getResolvableStatus(),
+                is(ResolvableStatus.RESOLVED));
+
+        leafIterator = yangNode.getListOfLeaf().listIterator();
+        leafInfo = leafIterator.next();
+
+        // Check whether the information in the leaf is correct under module.
+        assertThat(leafInfo.getName(), is("hello"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("string"));
+        assertThat(leafInfo.getDataType().getDataType(), is(YangDataTypes.STRING));
+    }
+
+    /**
+     * Checks inter file type linking with revision.
+     */
+    @Test
+    public void processInterFileTypeLinkingWithRevision()
+            throws IOException, ParserException, MojoExecutionException {
+
+        String searchDir = "src/test/resources/interfiletypewithrevision";
+        utilManager.createYangFileInfoSet(YangFileScanner.getYangFiles(searchDir));
+        utilManager.parseYangFileInfoSet();
+
+        YangNode refNode = null;
+        YangNode selfNode = null;
+
+        // Add references to import list.
+        yangLinkerManager.addRefToYangFilesImportList(utilManager.getYangFileInfoSet());
+
+        // Carry out inter-file linking.
+        yangLinkerManager.processInterFileLinking(utilManager.getYangFileInfoSet());
+
+        Iterator<YangFileInfo> yangFileInfoIterator = utilManager.getYangFileInfoSet().iterator();
+
+        YangFileInfo yangFileInfo = yangFileInfoIterator.next();
+
+        if (yangFileInfo.getRootNode().getName().equals("module1")) {
+            selfNode = yangFileInfo.getRootNode();
+            refNode = yangFileInfoIterator.next().getRootNode();
+        } else {
+            refNode = yangFileInfo.getRootNode();
+            selfNode = yangFileInfoIterator.next().getRootNode();
+        }
+
+        // Check whether the data model tree returned is of type module.
+        assertThat(selfNode instanceof YangModule, is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(selfNode.getNodeType(), is(MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) selfNode;
+        assertThat(yangNode.getName(), is("module1"));
+
+        ListIterator<YangLeaf> leafIterator = yangNode.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        assertThat(leafInfo.getName(), is("invalid-interval"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("hello"));
+        assertThat(leafInfo.getDataType().getDataType(), is(DERIVED));
+
+        assertThat(((YangDerivedInfo<?>) leafInfo.getDataType().getDataTypeExtendedInfo()).getReferredTypeDef(),
+                is((YangTypeDef) refNode.getChild()));
+
+        assertThat(leafInfo.getDataType().getResolvableStatus(), is(RESOLVED));
+
+        YangDerivedInfo<?> derivedInfo = (YangDerivedInfo<?>) leafInfo.getDataType().getDataTypeExtendedInfo();
+
+        // Check for the effective built-in type.
+        assertThat(derivedInfo.getEffectiveBuiltInType(), is(STRING));
+
+        // Check for the restriction.
+        assertThat(derivedInfo.getLengthRestrictionString(), is(nullValue()));
+        assertThat(derivedInfo.getRangeRestrictionString(), is(nullValue()));
+        assertThat(derivedInfo.getPatternRestriction(), is(nullValue()));
+        assertThat(derivedInfo.getResolvedExtendedInfo(), is(nullValue()));
+    }
+
+    /**
+     * Checks inter file type linking with revision in name.
+     */
+    @Test
+    public void processInterFileTypeLinkingWithRevisionInName()
+            throws IOException, ParserException, MojoExecutionException {
+
+        String searchDir = "src/test/resources/interfiletypewithrevisioninname";
+        utilManager.createYangFileInfoSet(YangFileScanner.getYangFiles(searchDir));
+        utilManager.parseYangFileInfoSet();
+
+        YangNode refNode = null;
+        YangNode selfNode = null;
+
+        // Add references to import list.
+        yangLinkerManager.addRefToYangFilesImportList(utilManager.getYangFileInfoSet());
+
+        // Carry out inter-file linking.
+        yangLinkerManager.processInterFileLinking(utilManager.getYangFileInfoSet());
+
+        Iterator<YangFileInfo> yangFileInfoIterator = utilManager.getYangFileInfoSet().iterator();
+
+        YangFileInfo yangFileInfo = yangFileInfoIterator.next();
+
+        if (yangFileInfo.getRootNode().getName().equals("module1")) {
+            selfNode = yangFileInfo.getRootNode();
+            refNode = yangFileInfoIterator.next().getRootNode();
+        } else {
+            refNode = yangFileInfo.getRootNode();
+            selfNode = yangFileInfoIterator.next().getRootNode();
+        }
+
+        // Check whether the data model tree returned is of type module.
+        assertThat(selfNode instanceof YangModule, is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(selfNode.getNodeType(), is(MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) selfNode;
+        assertThat(yangNode.getName(), is("module1"));
+
+        ListIterator<YangLeaf> leafIterator = yangNode.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        assertThat(leafInfo.getName(), is("invalid-interval"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("hello"));
+        assertThat(leafInfo.getDataType().getDataType(), is(DERIVED));
+
+        assertThat(((YangDerivedInfo<?>) leafInfo.getDataType().getDataTypeExtendedInfo()).getReferredTypeDef(),
+                is((YangTypeDef) refNode.getChild()));
+
+        assertThat(leafInfo.getDataType().getResolvableStatus(), is(RESOLVED));
+
+        YangDerivedInfo<?> derivedInfo = (YangDerivedInfo<?>) leafInfo.getDataType().getDataTypeExtendedInfo();
+
+        // Check for the effective built-in type.
+        assertThat(derivedInfo.getEffectiveBuiltInType(), is(STRING));
+
+        // Check for the restriction.
+        assertThat(derivedInfo.getLengthRestrictionString(), is(nullValue()));
+        assertThat(derivedInfo.getRangeRestrictionString(), is(nullValue()));
+        assertThat(derivedInfo.getPatternRestriction(), is(nullValue()));
+        assertThat(derivedInfo.getResolvedExtendedInfo(), is(nullValue()));
+    }
+
+    /**
+     * Checks hierarchical inter file type linking.
+     */
+    @Test
+    public void processHierarchicalInterFileTypeLinking()
+            throws IOException, ParserException, MojoExecutionException {
+
+        String searchDir = "src/test/resources/hierarchicalinterfiletype";
+        utilManager.createYangFileInfoSet(YangFileScanner.getYangFiles(searchDir));
+        utilManager.parseYangFileInfoSet();
+
+        YangNode refNode1 = null;
+        YangNode refNode2 = null;
+        YangNode selfNode = null;
+
+        // Add references to import list.
+        yangLinkerManager.addRefToYangFilesImportList(utilManager.getYangFileInfoSet());
+
+        // Carry out inter-file linking.
+        yangLinkerManager.processInterFileLinking(utilManager.getYangFileInfoSet());
+
+        for (YangFileInfo yangFile : utilManager.getYangFileInfoSet()) {
+            if (yangFile.getRootNode().getName().equals("ietf-network-topology")) {
+                selfNode = yangFile.getRootNode();
+            } else if (yangFile.getRootNode().getName().equals("ietf-network")) {
+                refNode1 = yangFile.getRootNode();
+            } else {
+                refNode2 = yangFile.getRootNode();
+            }
+        }
+
+        // Check whether the data model tree returned is of type module.
+        assertThat(selfNode instanceof YangModule, is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(selfNode.getNodeType(), is(MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) selfNode;
+        assertThat(yangNode.getName(), is("ietf-network-topology"));
+
+        ListIterator<YangLeaf> leafIterator = yangNode.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        assertThat(leafInfo.getName(), is("source-node"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("node-id"));
+        assertThat(leafInfo.getDataType().getDataType(), is(DERIVED));
+
+        assertThat(((YangDerivedInfo<?>) leafInfo.getDataType().getDataTypeExtendedInfo()).getReferredTypeDef(),
+                is((YangTypeDef) refNode1.getChild()));
+
+        assertThat(leafInfo.getDataType().getResolvableStatus(), is(RESOLVED));
+
+        YangDerivedInfo<?> derivedInfo = (YangDerivedInfo<?>) leafInfo.getDataType().getDataTypeExtendedInfo();
+
+        // Check for the effective built-in type.
+        assertThat(derivedInfo.getEffectiveBuiltInType(), is(STRING));
+
+        // Check for the restriction.
+        assertThat(derivedInfo.getLengthRestrictionString(), is(nullValue()));
+        assertThat(derivedInfo.getRangeRestrictionString(), is(nullValue()));
+        assertThat(derivedInfo.getPatternRestriction(), is(nullValue()));
+        assertThat(derivedInfo.getResolvedExtendedInfo(), is(nullValue()));
+    }
+
+    /**
+     * Checks hierarchical intra with inter file type linking.
+     */
+    @Test
+    public void processHierarchicalIntraWithInterFileTypeLinking()
+            throws IOException, ParserException, MojoExecutionException {
+
+        String searchDir = "src/test/resources/hierarchicalintrawithinterfiletype";
+        utilManager.createYangFileInfoSet(YangFileScanner.getYangFiles(searchDir));
+        utilManager.parseYangFileInfoSet();
+
+        YangNode refNode1 = null;
+        YangNode selfNode = null;
+
+        // Add references to import list.
+        yangLinkerManager.addRefToYangFilesImportList(utilManager.getYangFileInfoSet());
+
+        // Carry out inter-file linking.
+        yangLinkerManager.processInterFileLinking(utilManager.getYangFileInfoSet());
+
+        for (YangFileInfo yangFile : utilManager.getYangFileInfoSet()) {
+            if (yangFile.getRootNode().getName().equals("ietf-network")) {
+                selfNode = yangFile.getRootNode();
+            } else if (yangFile.getRootNode().getName().equals("ietf-inet-types")) {
+                refNode1 = yangFile.getRootNode();
+            }
+        }
+
+        // Check whether the data model tree returned is of type module.
+        assertThat(selfNode instanceof YangModule, is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(selfNode.getNodeType(), is(MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) selfNode;
+        assertThat(yangNode.getName(), is("ietf-network"));
+
+        ListIterator<YangLeaf> leafIterator = yangNode.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        assertThat(leafInfo.getName(), is("node-ref"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("node-id"));
+        assertThat(leafInfo.getDataType().getDataType(), is(DERIVED));
+
+        assertThat(((YangDerivedInfo<?>) leafInfo.getDataType().getDataTypeExtendedInfo()).getReferredTypeDef(),
+                is((YangTypeDef) selfNode.getChild()));
+
+        assertThat(leafInfo.getDataType().getResolvableStatus(), is(RESOLVED));
+
+        YangDerivedInfo<?> derivedInfo = (YangDerivedInfo<?>) leafInfo.getDataType().getDataTypeExtendedInfo();
+
+        // Check for the effective built-in type.
+        assertThat(derivedInfo.getEffectiveBuiltInType(), is(STRING));
+
+        // Check for the restriction.
+        assertThat(derivedInfo.getLengthRestrictionString(), is(nullValue()));
+        assertThat(derivedInfo.getRangeRestrictionString(), is(nullValue()));
+        assertThat(derivedInfo.getPatternRestriction(), is(nullValue()));
+        assertThat(derivedInfo.getResolvedExtendedInfo(), is(nullValue()));
+    }
+}

@@ -32,12 +32,13 @@ import org.onosproject.yangutils.parser.impl.YangUtilsParserManager;
 import static org.hamcrest.CoreMatchers.nullValue;
 import static org.hamcrest.MatcherAssert.assertThat;
 import static org.hamcrest.core.Is.is;
-import static org.onosproject.yangutils.datamodel.ResolvableStatus.INTRA_FILE_RESOLVED;
-import static org.onosproject.yangutils.datamodel.ResolvableStatus.RESOLVED;
+import static org.onosproject.yangutils.datamodel.YangDataTypes.BINARY;
 import static org.onosproject.yangutils.datamodel.YangDataTypes.DERIVED;
 import static org.onosproject.yangutils.datamodel.YangDataTypes.INT32;
 import static org.onosproject.yangutils.datamodel.YangDataTypes.STRING;
 import static org.onosproject.yangutils.datamodel.YangNodeType.MODULE_NODE;
+import static org.onosproject.yangutils.linker.impl.ResolvableStatus.INTRA_FILE_RESOLVED;
+import static org.onosproject.yangutils.linker.impl.ResolvableStatus.RESOLVED;
 
 /**
  * Test cases for testing "type" intra file linking.
@@ -516,4 +517,48 @@ public class IntraFileTypeLinkingTest {
         YangNode node =
                 manager.getDataModel("src/test/resources/SelfFileLinkingWithHierarchicalTypeFailureScenario.yang");
     }
+
+    /**
+     * Checks self resolution when typedef and leaf using type are siblings for binary type.
+     */
+    @Test
+    public void processSelfResolutionWhenTypeAndTypedefAtRootLevelForBinary()
+            throws IOException, ParserException {
+
+        YangNode node
+                = manager.getDataModel("src/test/resources/SelfResolutionWhenTypeAndTypedefAtRootLevelForBinary.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat(node instanceof YangModule, is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("ospf"));
+
+        ListIterator<YangLeaf> leafIterator = yangNode.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        assertThat(leafInfo.getName(), is("typedef14"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("type14"));
+        assertThat(leafInfo.getDataType().getDataType(), is(DERIVED));
+
+        assertThat(((YangDerivedInfo<?>) leafInfo.getDataType().getDataTypeExtendedInfo()).getReferredTypeDef(),
+                is((YangTypeDef) node.getChild()));
+
+        assertThat(leafInfo.getDataType().getResolvableStatus(), is(RESOLVED));
+
+        YangDerivedInfo<?> derivedInfo = (YangDerivedInfo<?>) leafInfo.getDataType().getDataTypeExtendedInfo();
+
+        // Check for the effective built-in type.
+        assertThat(derivedInfo.getEffectiveBuiltInType(), is(BINARY));
+
+        // Check for the restriction.
+        assertThat(derivedInfo.getLengthRestrictionString(), is(nullValue()));
+        assertThat(derivedInfo.getRangeRestrictionString(), is(nullValue()));
+        assertThat(derivedInfo.getPatternRestriction(), is(nullValue()));
+        assertThat(derivedInfo.getResolvedExtendedInfo(), is(nullValue()));
+    }
 }

@@ -21,7 +21,6 @@ import java.util.ListIterator;
 import org.junit.Rule;
 import org.junit.Test;
 import org.junit.rules.ExpectedException;
-import org.onosproject.yangutils.datamodel.ResolvableStatus;
 import org.onosproject.yangutils.datamodel.YangContainer;
 import org.onosproject.yangutils.datamodel.YangDataTypes;
 import org.onosproject.yangutils.datamodel.YangGrouping;
@@ -32,6 +31,8 @@ import org.onosproject.yangutils.datamodel.YangNode;
 import org.onosproject.yangutils.datamodel.YangNodeType;
 import org.onosproject.yangutils.datamodel.YangTypeDef;
 import org.onosproject.yangutils.datamodel.YangUses;
+import org.onosproject.yangutils.linker.exceptions.LinkerException;
+import org.onosproject.yangutils.linker.impl.ResolvableStatus;
 import org.onosproject.yangutils.parser.exceptions.ParserException;
 import org.onosproject.yangutils.parser.impl.YangUtilsParserManager;
 
@@ -293,9 +294,9 @@ public class IntraFileUsesLinkingTest {
      */
     @Test
     public void processSelfResolutionGroupingReferencingItselfFailureScenerio()
-            throws IOException, ParserException {
+            throws IOException {
 
-        thrown.expect(ParserException.class);
+        thrown.expect(LinkerException.class);
         thrown.expectMessage(
                 "YANG file error: Duplicate input identifier detected, same as leaf \"zip-code\"");
         YangNode node = manager

@@ -30,6 +30,7 @@ import org.onosproject.yangutils.datamodel.YangRangeRestriction;
 import org.onosproject.yangutils.datamodel.YangStringRestriction;
 import org.onosproject.yangutils.datamodel.YangTypeDef;
 import org.onosproject.yangutils.datamodel.exceptions.DataModelException;
+import org.onosproject.yangutils.linker.exceptions.LinkerException;
 import org.onosproject.yangutils.parser.exceptions.ParserException;
 import org.onosproject.yangutils.parser.impl.YangUtilsParserManager;
 import org.onosproject.yangutils.utils.builtindatatype.YangInt32;
@@ -39,11 +40,11 @@ import static org.hamcrest.CoreMatchers.nullValue;
 import static org.hamcrest.MatcherAssert.assertThat;
 import static org.hamcrest.core.Is.is;
 import static org.hamcrest.core.IsNull.notNullValue;
-import static org.onosproject.yangutils.datamodel.ResolvableStatus.RESOLVED;
 import static org.onosproject.yangutils.datamodel.YangDataTypes.DERIVED;
 import static org.onosproject.yangutils.datamodel.YangDataTypes.INT32;
 import static org.onosproject.yangutils.datamodel.YangDataTypes.STRING;
 import static org.onosproject.yangutils.datamodel.YangNodeType.MODULE_NODE;
+import static org.onosproject.yangutils.linker.impl.ResolvableStatus.RESOLVED;
 
 /**
  * Test cases for testing restriction resolution.
@@ -225,9 +226,9 @@ public final class RestrictionResolutionTest {
     /**
      * Checks length restriction in typedef and in type with not stricter value.
      */
-    @Test(expected = ParserException.class)
+    @Test(expected = LinkerException.class)
     public void processLengthRestrictionInTypedefAndTypeInValid()
-            throws IOException, ParserException, DataModelException {
+            throws IOException, DataModelException {
         YangNode node = manager.getDataModel("src/test/resources/LengthRestrictionInTypedefAndTypeInValid.yang");
     }
 
@@ -429,9 +430,9 @@ public final class RestrictionResolutionTest {
     /**
      * Checks range restriction for string in referred type.
      */
-    @Test(expected = ParserException.class)
+    @Test(expected = LinkerException.class)
     public void processRangeRestrictionInStringInRefType()
-            throws IOException, ParserException, DataModelException {
+            throws IOException, DataModelException {
         YangNode node = manager.getDataModel("src/test/resources/RangeRestrictionInStringInRefType.yang");
     }
 
@@ -826,9 +827,9 @@ public final class RestrictionResolutionTest {
      * Checks multiple pattern and length restriction in referred type and
      * typedef invalid scenario.
      */
-    @Test(expected = ParserException.class)
+    @Test(expected = LinkerException.class)
     public void processMultiplePatternAndLengthRestrictionInValid()
-            throws IOException, ParserException, DataModelException {
+            throws IOException, DataModelException {
         YangNode node = manager.getDataModel("src/test/resources/MultiplePatternAndLengthRestrictionInValid.yang");
     }
 }

@@ -144,7 +144,7 @@ public class LengthRestrictionListenerTest {
     public void processLengthWithInvalidType() throws IOException, ParserException {
         thrown.expect(ParserException.class);
         thrown.expectMessage("YANG file error : length name \"1..100\" can be used to restrict the built-in type" +
-                " string or types derived from string.");
+                " string/binary or types derived from string/binary.");
         YangNode node = manager.getDataModel("src/test/resources/LengthWithInvalidType.yang");
     }
 

@@ -26,7 +26,6 @@ import java.util.List;
 import org.junit.Rule;
 import org.junit.Test;
 import org.junit.rules.ExpectedException;
-import org.onosproject.yangutils.plugin.manager.YangFileInfo;
 
 import static org.hamcrest.core.Is.is;
 import static org.hamcrest.core.IsNot.not;
@@ -49,11 +48,11 @@ public final class YangFileScannerTest {
     /**
      * A private constructor is tested.
      *
-     * @throws SecurityException if any security violation is observed
-     * @throws NoSuchMethodException if when the method is not found
-     * @throws IllegalArgumentException if there is illegal argument found
-     * @throws InstantiationException if instantiation is provoked for the private constructor
-     * @throws IllegalAccessException if instance is provoked or a method is provoked
+     * @throws SecurityException         if any security violation is observed
+     * @throws NoSuchMethodException     if when the method is not found
+     * @throws IllegalArgumentException  if there is illegal argument found
+     * @throws InstantiationException    if instantiation is provoked for the private constructor
+     * @throws IllegalAccessException    if instance is provoked or a method is provoked
      * @throws InvocationTargetException when an exception occurs by the method or constructor
      */
     @Test
@@ -101,7 +100,7 @@ public final class YangFileScannerTest {
     /**
      * Method used for creating file inside the specified directory.
      *
-     * @param myDir the path where file has to be created inside
+     * @param myDir    the path where file has to be created inside
      * @param fileName the name of the file to be created
      */
     private void createFile(File myDir, String fileName) throws IOException {
@@ -136,7 +135,7 @@ public final class YangFileScannerTest {
 
         String emptyYangDir = baseDir + separator + "scanner1";
         File path = createDirectory(emptyYangDir);
-        List<YangFileInfo> emptyDirContents = getYangFiles(path.toString());
+        List<String> emptyDirContents = getYangFiles(path.toString());
         List<String> expectedContents = new LinkedList<>();
         assertThat(true, is(emptyDirContents.equals(expectedContents)));
     }

@@ -6,13 +6,13 @@ module Test {
         list valid {
             key "invalid-interval";
             leaf invalid-interval {
-                type hello;
+                type Ant:hello;
             }
         }
     }
     container isis {
         typedef hello {
-            type String;
+            type string;
         }
     }
 }

@@ -3,7 +3,7 @@ module Test {
     namespace http://huawei.com;
     prefix Ant;
     typedef Percentage {
-    type INT;
+        type Ant:INT;
     }
     container ospf {
         list valid {

@@ -2,9 +2,9 @@ module Test {
     yang-version 1;
     namespace http://huawei.com;
     prefix Ant;
-    container test{
-        leaf leaf2{
-            type String;
+    container test {
+        leaf leaf2 {
+            type string;
         }
     	grouping treat {
             grouping create {
@@ -13,5 +13,5 @@ module Test {
             }
         }
     }
-    uses treat;
+    uses Ant:treat;
 }

+module ospf {
+     namespace "urn:cisco:params:xml:ns:yang:ospf";
+     // replace with IANA namespace when assigned
+     prefix ospf;
+      revision 2020-10-20 {
+       description
+         "Initial revision.";
+     }
+
+    typedef type14 {
+        type binary;
+    }
+
+    leaf typedef14 {
+       type type14;
+     }
+}

@@ -3,9 +3,9 @@ module Test {
     namespace http://huawei.com;
     prefix Ant;
     leaf invalid-interval {
-        type hello;
+        type Ant:hello;
     }
     typedef hi {
-        type String;
+        type string;
     }
 }

+  module ietf-inet-types {
+
+    yang-version 1;
+
+    namespace
+      "urn:ietf:params:xml:ns:yang:ietf-inet-types";
+
+    prefix inet;
+
+
+
+    typedef uri {
+      type string;
+    }
+  }

+ module ietf-network-topology {
+   yang-version 1;
+   namespace "urn:ietf:params:xml:ns:yang:ietf-network-topology";
+   prefix nt;
+
+   import ietf-inet-types {
+     prefix inet;
+   }
+   import ietf-network {
+     prefix nd;
+   }
+         leaf source-node {
+           type nd:node-id;
+           description
+             "Source node identifier, must be in same topology.";
+         }
+ }

+   module ietf-network {
+     yang-version 1;
+     namespace "urn:ietf:params:xml:ns:yang:ietf-network";
+     prefix nd;
+
+     import ietf-inet-types {
+       prefix inet;
+     }
+
+    typedef node-id {
+       type inet:uri;
+       description
+         "Identifier for a node.";
+     }
+
+   }

+  module ietf-inet-types {
+
+    yang-version 1;
+
+    namespace
+      "urn:ietf:params:xml:ns:yang:ietf-inet-types";
+
+    prefix inet;
+
+    typedef uri {
+      type string;
+    }
+  }

+   module ietf-network {
+     yang-version 1;
+     namespace "urn:ietf:params:xml:ns:yang:ietf-network";
+     prefix nd;
+
+     import ietf-inet-types {
+       prefix inet;
+     }
+       leaf node-ref {
+         type node-id;
+         description
+           "Used to reference a node.
+            Nodes are identified relative to the network they are
+            contained in.";
+       }
+
+    typedef node-id {
+       type inet:uri;
+       description
+         "Identifier for a node.";
+     }
+   }

+module module1 {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    import module2 {
+        prefix p;
+    }
+    leaf invalid-interval {
+        type p:hello;
+    }
+    typedef hello {
+        type string;
+    }
+}

+module module2 {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant2;
+    typedef hello {
+        type string;
+    }
+}

+module module1 {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    include module2;
+    leaf invalid-interval {
+        type hello;
+    }
+}

+submodule module2 {
+    yang-version 1;
+    belongs-to module1 {
+        prefix "module1";
+    }
+    typedef hello {
+        type string;
+    }
+}

+module module1 {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    import module2 {
+        prefix p;
+        revision-date 2007-06-09;
+    }
+    leaf invalid-interval {
+        type p:hello;
+    }
+    typedef hello {
+        type string;
+    }
+}

+module module2 {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant2;
+    revision 2007-06-09 {
+        description "Initial revision.";
+    }
+    typedef hello {
+        type string;
+    }
+}

+module module1 {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    import module2 {
+        prefix p;
+        revision-date 2007-06-09;
+    }
+    leaf invalid-interval {
+        type p:hello;
+    }
+    typedef hello {
+        type string;
+    }
+}

+module module2 {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant2;
+    revision 2007-06-09 {
+        description "Initial revision.";
+    }
+    typedef hello {
+        type string;
+    }
+}

+module module1 {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    import module2 {
+        prefix p;
+    }
+    uses p:hello;
+}

+module module2 {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    grouping hello {
+        leaf hello {
+            type string;
+        }
+    }
+}

+module module1 {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    include module2;
+    uses hello;
+}

+submodule module2 {
+    yang-version 1;
+    belongs-to module1 {
+        prefix "module1";
+    }
+    grouping hello {
+        leaf hello {
+            type string;
+        }
+    }
+}