[ONOS-3116] Implementation of Flow classifier Id for service function chain.

Change-Id: Ia696b8042281050e50d8ba5c34b2f1d6db5cc856

+/*
+ * 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.vtnrsc;
+
+import java.util.Objects;
+import java.util.UUID;
+
+import com.google.common.base.MoreObjects;
+
+/**
+ * Flow classification identifier.
+ */
+public final class FlowClassifierId {
+
+    private final UUID flowClassifierId;
+
+    /**
+     * Constructor to create flow classifier id.
+     *
+     * @param flowClassifierId flow classifier id.
+     */
+    private FlowClassifierId(final UUID flowClassifierId) {
+        this.flowClassifierId = flowClassifierId;
+    }
+
+    /**
+     * Returns new flow classifier id.
+     *
+     * @param flowClassifierId flow classifier id
+     * @return new flow classifier id
+     */
+    public static FlowClassifierId flowClassifierId(final UUID flowClassifierId) {
+        return new FlowClassifierId(flowClassifierId);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hashCode(this.flowClassifierId);
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj instanceof FlowClassifierId) {
+            final FlowClassifierId other = (FlowClassifierId) obj;
+            return Objects.equals(this.flowClassifierId, other.flowClassifierId);
+        }
+        return false;
+    }
+
+    @Override
+    public String toString() {
+        return MoreObjects.toStringHelper(getClass())
+                .add("FlowClassifierId", flowClassifierId)
+                .toString();
+    }
+}