Adding EVPN App code

Change-Id: Id3b2192f56f054cadcd8384092245b8757a781a9
diff --git a/apps/evpnopenflow/src/main/java/org/onosproject/evpnopenflow/rsc/DefaultVpnAfConfig.java b/apps/evpnopenflow/src/main/java/org/onosproject/evpnopenflow/rsc/DefaultVpnAfConfig.java
new file mode 100755
index 0000000..2481830
--- /dev/null
+++ b/apps/evpnopenflow/src/main/java/org/onosproject/evpnopenflow/rsc/DefaultVpnAfConfig.java
@@ -0,0 +1,87 @@
+/*
+ * 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 org.onosproject.incubator.net.routing.VpnRouteTarget;
+
+import static com.google.common.base.MoreObjects.toStringHelper;
+import static com.google.common.base.Preconditions.checkNotNull;
+import static org.onosproject.evpnopenflow.rsc.EvpnConstants.ID_CANNOT_BE_NULL;
+import static org.onosproject.evpnopenflow.rsc.EvpnConstants.RT_CANNOT_BE_NULL;
+import static org.onosproject.evpnopenflow.rsc.EvpnConstants.RT_TYPE_CANNOT_BE_NULL;
+
+/**
+ * Default implementation of VPN AF configuration.
+ */
+public class DefaultVpnAfConfig implements VpnAfConfig {
+
+    private final String exportRoutePolicy;
+    private final String importRoutePolicy;
+    private final VpnRouteTarget routeTarget;
+    private final String routeTargetType;
+
+    /**
+     * creates vpn af configuration object.
+     *
+     * @param exportRoutePolicy export route policy
+     * @param importRoutePolicy import route policy
+     * @param routeTarget       route target value
+     * @param routeTargetType   route target type
+     */
+    public DefaultVpnAfConfig(String exportRoutePolicy,
+                              String importRoutePolicy,
+                              VpnRouteTarget routeTarget,
+                              String routeTargetType) {
+        this.exportRoutePolicy = checkNotNull(exportRoutePolicy,
+                                              ID_CANNOT_BE_NULL);
+        this.importRoutePolicy = checkNotNull(importRoutePolicy,
+                                              ID_CANNOT_BE_NULL);
+        this.routeTarget = checkNotNull(routeTarget, RT_CANNOT_BE_NULL);
+        this.routeTargetType = checkNotNull(routeTargetType,
+                                            RT_TYPE_CANNOT_BE_NULL);
+    }
+
+    @Override
+    public String exportRoutePolicy() {
+        return exportRoutePolicy;
+    }
+
+    @Override
+    public String importRoutePolicy() {
+        return importRoutePolicy;
+    }
+
+    @Override
+    public VpnRouteTarget routeTarget() {
+        return routeTarget;
+    }
+
+    @Override
+    public String routeTargetType() {
+        return routeTargetType;
+    }
+
+    @Override
+    public String toString() {
+        return toStringHelper(this)
+                .add("exportRoutePolicy", exportRoutePolicy)
+                .add("importRoutePolicy", importRoutePolicy)
+                .add("routeTarget", routeTarget)
+                .add("routeTargetType", routeTargetType)
+                .toString();
+    }
+}