ONOS-688 (ONOS-1835,1836,1837) :
 - Implements features to create and remove tunnels and tunnel flow policies.
 - Implements REST API to create/show/delete tunnels and policies.
 - Supports only single instance for now.
 - Fix "apply" actions to "write" actions of all flow rules
Change-Id: I3740ed82fed8eab4ab8b03839192da72d3e223f1
diff --git a/src/main/java/org/onosproject/segmentrouting/Policy.java b/src/main/java/org/onosproject/segmentrouting/Policy.java
new file mode 100644
index 0000000..d47bc2e
--- /dev/null
+++ b/src/main/java/org/onosproject/segmentrouting/Policy.java
@@ -0,0 +1,83 @@
+/*
+ * 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.segmentrouting;
+
+import org.onosproject.net.flow.TrafficSelector;
+
+/**
+ * Interface for Segment Routing Policy.
+ */
+public interface Policy {
+    /**
+     * Enums for policy type.
+     */
+    enum Type {
+        // Tunnel flow policy type
+        TUNNEL_FLOW,
+
+        // Load balancing policy type
+        LOADBALANCE,
+
+        // policy to avoid specific routers or links
+        AVOID,
+
+        // Access Control policy type
+        DENY
+    }
+
+    /**
+     * Returns the policy ID.
+     *
+     * @return policy ID
+     */
+    String id();
+
+    /**
+     * Returns the traffic selector object.
+     *
+     * @return TrafficSelector object
+     */
+    TrafficSelector selector();
+
+    /**
+     * Returns the priority of the policy.
+     *
+     * @return priority
+     */
+    int priority();
+
+    /**
+     * Returns the policy type.
+     *
+     * @return policy type
+     */
+    Type type();
+
+    /**
+     * Creates a policy.
+     *
+     * @return true if succeeds, false otherwise
+     */
+    boolean create();
+
+    /**
+     * Removes the policy.
+     *
+     * @return true if succeeds, false otherwise
+     */
+    boolean remove();
+}