Adding EVPN App code

Change-Id: Id3b2192f56f054cadcd8384092245b8757a781a9
diff --git a/apps/evpnopenflow/src/main/java/org/onosproject/evpnopenflow/rsc/DefaultVpnPort.java b/apps/evpnopenflow/src/main/java/org/onosproject/evpnopenflow/rsc/DefaultVpnPort.java
new file mode 100755
index 0000000..c036a5f
--- /dev/null
+++ b/apps/evpnopenflow/src/main/java/org/onosproject/evpnopenflow/rsc/DefaultVpnPort.java
@@ -0,0 +1,81 @@
+/*
+ * Copyright 2017-present Open Networking Foundation
+ *
+ * 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.evpnopenflow.rsc;
+
+import java.util.Objects;
+
+import static com.google.common.base.MoreObjects.toStringHelper;
+import static com.google.common.base.Preconditions.checkNotNull;
+import static org.onosproject.evpnopenflow.rsc.EvpnConstants.ID;
+import static org.onosproject.evpnopenflow.rsc.EvpnConstants.ID_CANNOT_BE_NULL;
+import static org.onosproject.evpnopenflow.rsc.EvpnConstants.VPN_INSTANCE_ID;
+import static org.onosproject.evpnopenflow.rsc.EvpnConstants.VPN_INSTANCE_ID_CANNOT_BE_NULL;
+
+/**
+ * Default implementation of VPN port.
+ */
+public class DefaultVpnPort implements VpnPort {
+
+    private final VpnPortId id;
+    private final VpnInstanceId vpnInstanceId;
+
+    /**
+     * creates vpn port object.
+     *
+     * @param id            vpn port id
+     * @param vpnInstanceId vpn instance id
+     */
+    public DefaultVpnPort(VpnPortId id, VpnInstanceId vpnInstanceId) {
+        this.id = checkNotNull(id, ID_CANNOT_BE_NULL);
+        this.vpnInstanceId = checkNotNull(vpnInstanceId,
+                                          VPN_INSTANCE_ID_CANNOT_BE_NULL);
+    }
+
+    @Override
+    public VpnPortId id() {
+        return id;
+    }
+
+    @Override
+    public VpnInstanceId vpnInstanceId() {
+        return vpnInstanceId;
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(id, vpnInstanceId);
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj instanceof DefaultVpnPort) {
+            final DefaultVpnPort that = (DefaultVpnPort) obj;
+            return Objects.equals(this.id, that.id)
+                    && Objects.equals(this.vpnInstanceId, that.vpnInstanceId);
+        }
+        return false;
+    }
+
+    @Override
+    public String toString() {
+        return toStringHelper(this).add(ID, id)
+                .add(VPN_INSTANCE_ID, vpnInstanceId).toString();
+    }
+}