encapsulation constraint related to ONOS-3445

Change-Id: I5f7d912e34c343703108e0cb95c4ea94290663a8

+/*
+ * Copyright 2014-2015 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.net;
+
+public enum EncapsulationType {
+    /**
+     * Indicates an MPLS encapsulation.
+     */
+    MPLS,
+    /**
+     * Indicates a VLAN encapsulation.
+     */
+    VLAN,
+};
+
+

+/*
+ * Copyright 2014-2015 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.net.intent.constraint;
+
+
+import org.onosproject.net.EncapsulationType;
+import org.onosproject.net.Link;
+import org.onosproject.net.resource.link.LinkResourceService;
+
+import static com.google.common.base.MoreObjects.toStringHelper;
+import static com.google.common.base.Preconditions.checkNotNull;
+
+/**
+ * Encapsulation to manage core transportation.
+ */
+public class EncapsulationConstraint extends BooleanConstraint {
+
+    private EncapsulationType encapType;
+
+    /**
+     * Creates a new encapsulation constraint.
+     *
+     * @param encapType the encapsulation type {@link EncapsulationType}
+     */
+    public EncapsulationConstraint(EncapsulationType encapType) {
+        checkNotNull(encapType, "EncapsulationType cannot be null");
+        this.encapType = encapType;
+    }
+
+
+    @Override
+    public boolean isValid(Link link, LinkResourceService resourceService) {
+        //TODO: validate the availability of the resources for each link in the path.
+        //e.g., availability of MPLSlabels, VLANID
+
+        return true;
+    }
+
+    /**
+     * Returns the encapsulation type required by this constraint.
+     *
+     * @return encapType
+     */
+    public EncapsulationType encapType() {
+        return encapType;
+    }
+
+    @Override
+    public int hashCode() {
+        return encapType.hashCode();
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj == null || getClass() != obj.getClass()) {
+            return false;
+        }
+        final EncapsulationConstraint other = (EncapsulationConstraint) obj;
+        return this.encapType() == other.encapType();
+    }
+
+    @Override
+    public String toString() {
+        return toStringHelper(this).add("encapType", encapType).toString();
+    }
+}