ONOS 2360 Review comments fix on PCEP TE Report message.

Change-Id: I442d3d623e4bbf885a86ac91a5882de226537246

+/*
+ * Copyright 2015 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.pcepio.protocol.ver1;
+
+import java.util.LinkedList;
+import java.util.ListIterator;
+
+import org.jboss.netty.buffer.ChannelBuffer;
+import org.onosproject.pcepio.exceptions.PcepParseException;
+import org.onosproject.pcepio.protocol.PcepMessageReader;
+import org.onosproject.pcepio.protocol.PcepMessageWriter;
+import org.onosproject.pcepio.protocol.PcepTEObject;
+import org.onosproject.pcepio.protocol.PcepTEReportMsg;
+import org.onosproject.pcepio.protocol.PcepType;
+import org.onosproject.pcepio.protocol.PcepVersion;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import com.google.common.base.MoreObjects;
+
+/*
+ * Provides  PCEP TE Report Message.
+ */
+class PcepTEReportMsgVer1 implements PcepTEReportMsg {
+
+    /*
+     * Ref : draft-dhodylee-pce-pcep-te-data-extn-02, section 8.1
+
+        <TERpt Message>  ::=  <Common Header>
+                              <te-report-list>
+    Where:
+        <te-report-list> ::=  <TE>[<te-report-list>]
+     */
+
+    private static final Logger log = LoggerFactory.getLogger(PcepTEReportMsgVer1.class);
+    //PACKET_MINIMUM_LENGTH = CommonHeaderLen(4)+TEObjMinLen(12)
+    public static final int PACKET_MINIMUM_LENGTH = 16;
+    public static final PcepType MSG_TYPE = PcepType.TE_REPORT;
+    // <te-report-list>
+    private LinkedList<PcepTEObject> teReportList;
+
+    public static final PcepTEReportMsgVer1.Reader READER = new Reader();
+
+    static class Reader implements PcepMessageReader<PcepTEReportMsg> {
+
+        LinkedList<PcepTEObject> teReportList;
+
+        @Override
+        public PcepTEReportMsg readFrom(ChannelBuffer cb) throws PcepParseException {
+
+            if (cb.readableBytes() < PACKET_MINIMUM_LENGTH) {
+                return null;
+            }
+
+            teReportList = new LinkedList<PcepTEObject>();
+
+            byte version = cb.readByte();
+            version = (byte) (version >> PcepMessageVer1.SHIFT_FLAG);
+            if (version != PcepMessageVer1.PACKET_VERSION) {
+                throw new PcepParseException("Wrong version. Expected=PcepVersion.PCEP_1(1), got=" + version);
+            }
+
+            byte type = cb.readByte();
+            if (type != MSG_TYPE.getType()) {
+                throw new PcepParseException("Wrong type. Expected=PcepType.TE_REPORT(14), got=" + type);
+            }
+
+            short length = cb.readShort();
+            if (length < PACKET_MINIMUM_LENGTH) {
+                throw new PcepParseException(
+                        "Wrong length. Expected to be >= " + PACKET_MINIMUM_LENGTH + ", is: " + length);
+            }
+
+            // Parse state report list
+            parseTEReportList(cb);
+
+            return new PcepTEReportMsgVer1(teReportList);
+        }
+
+        /**
+         * Parse te-report-list.
+         *
+         * @param cb input Channel Buffer
+         * @throws PcepParseException when fails to parse TE Report list.
+         */
+        public void parseTEReportList(ChannelBuffer cb) throws PcepParseException {
+            // <te-report-list> ::= <TE>[<te-report-list>]
+
+            while (0 < cb.readableBytes()) {
+                //store TE objectS
+                if (!teReportList.add(PcepTEObjectVer1.read(cb))) {
+                    throw new PcepParseException("Failed to add TE object to TE report list");
+                }
+            }
+        }
+    }
+
+    /**
+     * Constructor to initialize TE Report List.
+     *
+     * @param teReportList list of PCEP TE Object
+     */
+    PcepTEReportMsgVer1(LinkedList<PcepTEObject> teReportList) {
+        this.teReportList = teReportList;
+    }
+
+    static class Builder implements PcepTEReportMsg.Builder {
+        // PCEP TE Report message fields
+        LinkedList<PcepTEObject> teReportList;
+
+        @Override
+        public PcepVersion getVersion() {
+            return PcepVersion.PCEP_1;
+        }
+
+        @Override
+        public PcepType getType() {
+            return PcepType.TE_REPORT;
+        }
+
+        @Override
+        public PcepTEReportMsg build() {
+            return new PcepTEReportMsgVer1(this.teReportList);
+        }
+
+        @Override
+        public LinkedList<PcepTEObject> getTEReportList() {
+            return this.teReportList;
+        }
+
+        @Override
+        public Builder setTEReportList(LinkedList<PcepTEObject> ll) {
+            this.teReportList = ll;
+            return this;
+        }
+    }
+
+    @Override
+    public void writeTo(ChannelBuffer bb) throws PcepParseException {
+        WRITER.write(bb, this);
+    }
+
+    static final Writer WRITER = new Writer();
+
+    static class Writer implements PcepMessageWriter<PcepTEReportMsgVer1> {
+
+        @Override
+        public void write(ChannelBuffer bb, PcepTEReportMsgVer1 message) throws PcepParseException {
+
+            int startIndex = bb.writerIndex();
+
+            // first 3 bits set to version
+            bb.writeByte((byte) (PcepMessageVer1.PACKET_VERSION << PcepMessageVer1.SHIFT_FLAG));
+
+            // message type
+            bb.writeByte(MSG_TYPE.getType());
+
+            // Length of the message will be updated at the end
+            // First write with 0s
+            int msgLenIndex = bb.writerIndex();
+            bb.writeShort((short) 0);
+
+            ListIterator<PcepTEObject> listIterator = message.teReportList.listIterator();
+
+            while (listIterator.hasNext()) {
+                PcepTEObject teObj = listIterator.next();
+                teObj.write(bb);
+            }
+
+            // update message length field
+            int length = bb.writerIndex() - startIndex;
+            bb.setShort(msgLenIndex, (short) length);
+        }
+    }
+
+    @Override
+    public PcepVersion getVersion() {
+        return PcepVersion.PCEP_1;
+    }
+
+    @Override
+    public PcepType getType() {
+        return MSG_TYPE;
+    }
+
+    @Override
+    public LinkedList<PcepTEObject> getTEReportList() {
+        return this.teReportList;
+    }
+
+    @Override
+    public void setTEReportList(LinkedList<PcepTEObject> ll) {
+        this.teReportList = ll;
+    }
+
+    @Override
+    public String toString() {
+        return MoreObjects.toStringHelper(getClass()).add("TeReportList", teReportList).toString();
+    }
+}