Adding EVPN App code

Change-Id: Id3b2192f56f054cadcd8384092245b8757a781a9
diff --git a/apps/evpnopenflow/src/main/java/org/onosproject/evpnopenflow/rsc/vpnport/VpnPortEvent.java b/apps/evpnopenflow/src/main/java/org/onosproject/evpnopenflow/rsc/vpnport/VpnPortEvent.java
new file mode 100755
index 0000000..acc28db
--- /dev/null
+++ b/apps/evpnopenflow/src/main/java/org/onosproject/evpnopenflow/rsc/vpnport/VpnPortEvent.java
@@ -0,0 +1,65 @@
+/*
+ * 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.vpnport;
+
+import org.onosproject.event.AbstractEvent;
+import org.onosproject.evpnopenflow.rsc.VpnPort;
+
+/**
+ * Describes network VPN port event.
+ */
+public class VpnPortEvent extends AbstractEvent<VpnPortEvent.Type, VpnPort> {
+
+    /**
+     * Type of VPN port events.
+     */
+    public enum Type {
+        /**
+         * Signifies that VPN port has been set.
+         */
+        VPN_PORT_SET,
+        /**
+         * Signifies that VPN port has been deleted.
+         */
+        VPN_PORT_DELETE,
+        /**
+         * Signifies that VPN port has been updated.
+         */
+        VPN_PORT_UPDATE
+    }
+
+    /**
+     * Creates an event of a given type and for the specified VPN port.
+     *
+     * @param type    VPN port type
+     * @param vpnPort VPN port subject
+     */
+    public VpnPortEvent(Type type, VpnPort vpnPort) {
+        super(type, vpnPort);
+    }
+
+    /**
+     * Creates an event of a given type and for the specified VPN port.
+     *
+     * @param type    VPN port type
+     * @param vpnPort VPN port subject
+     * @param time    occurrence time
+     */
+    public VpnPortEvent(Type type, VpnPort vpnPort, long time) {
+        super(type, vpnPort, time);
+    }
+}