[ONOS-4612]Update SFC flows inline with the Official OVS NSH patch

Change-Id: If58517841096a939860d88aa78eca7cae46b9935
diff --git a/apps/vtn/vtnweb/src/main/java/org/onosproject/vtnweb/resources/PortChainSfMapWebResource.java b/apps/vtn/vtnweb/src/main/java/org/onosproject/vtnweb/resources/PortChainSfMapWebResource.java
new file mode 100644
index 0000000..b644786
--- /dev/null
+++ b/apps/vtn/vtnweb/src/main/java/org/onosproject/vtnweb/resources/PortChainSfMapWebResource.java
@@ -0,0 +1,71 @@
+/*
+ * Copyright 2016-present 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.vtnweb.resources;
+
+import static org.onlab.util.Tools.nullIsNotFound;
+
+import javax.ws.rs.Consumes;
+import javax.ws.rs.GET;
+import javax.ws.rs.Path;
+import javax.ws.rs.PathParam;
+import javax.ws.rs.Produces;
+import javax.ws.rs.core.MediaType;
+import javax.ws.rs.core.Response;
+
+import org.onosproject.rest.AbstractWebResource;
+import org.onosproject.vtnrsc.PortChainId;
+import org.onosproject.vtnrsc.ServiceFunctionGroup;
+import org.onosproject.vtnrsc.portchainsfmap.PortChainSfMapService;
+
+import com.fasterxml.jackson.databind.node.ArrayNode;
+import com.fasterxml.jackson.databind.node.ObjectNode;
+
+/**
+ * Query service function and load details by port chain.
+ */
+
+@Path("portChainSfMap")
+public class PortChainSfMapWebResource extends AbstractWebResource {
+
+    public static final String PORT_CHAIN_NOT_FOUND = "Port chain not found";
+    public static final String PORT_CHAIN_ID_EXIST = "Port chain exists";
+    public static final String PORT_CHAIN_ID_NOT_EXIST = "Port chain does not exist with identifier";
+
+    /**
+     * Get service function details of a specified port chain id.
+     *
+     * @param id port chain id
+     * @return 200 OK, 404 if given identifier does not exist
+     */
+    @GET
+    @Path("{chainId}")
+    @Produces(MediaType.APPLICATION_JSON)
+    @Consumes(MediaType.APPLICATION_JSON)
+    public Response getPortChainSfMap(@PathParam("chainId") String id) {
+
+        Iterable<ServiceFunctionGroup> serviceFunctionGroups = nullIsNotFound(get(PortChainSfMapService.class)
+                .getServiceFunctions(PortChainId.of(id)),
+                                                                              PORT_CHAIN_NOT_FOUND);
+        ObjectNode result = mapper().createObjectNode();
+        ArrayNode portChainSfMap = result.putArray("portChainSfMap");
+        if (serviceFunctionGroups != null) {
+            for (final ServiceFunctionGroup serviceFunctionGroup : serviceFunctionGroups) {
+                portChainSfMap.add(codec(ServiceFunctionGroup.class).encode(serviceFunctionGroup, this));
+            }
+        }
+        return ok(result.toString()).build();
+    }
+}