[ONOS-3112] Web resource for Port Chain in SFC

Change-Id: Idc3bc7e2789923459b58fa400a1e97a1f7b78a88

+/*
+ * Copyright 2014-2015 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.vtnweb.resources;
+
+import static javax.ws.rs.core.Response.Status.NOT_FOUND;
+import static javax.ws.rs.core.Response.Status.OK;
+import static org.onlab.util.Tools.nullIsNotFound;
+
+import java.io.IOException;
+import java.io.InputStream;
+
+import javax.ws.rs.Consumes;
+import javax.ws.rs.DELETE;
+import javax.ws.rs.GET;
+import javax.ws.rs.POST;
+import javax.ws.rs.PUT;
+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.PortChain;
+import org.onosproject.vtnrsc.PortChainId;
+import org.onosproject.vtnrsc.portchain.PortChainService;
+import org.onosproject.vtnweb.web.PortChainCodec;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.databind.node.ObjectNode;
+
+/**
+ * Query and program port chain.
+ */
+
+@Path("port_chains")
+public class PortChainWebResource extends AbstractWebResource {
+
+    private final Logger log = LoggerFactory.getLogger(PortChainWebResource.class);
+    private final PortChainService service = get(PortChainService.class);
+    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 details of all port chains created.
+     *
+     * @return 200 OK
+     */
+    @GET
+    @Produces(MediaType.APPLICATION_JSON)
+    public Response getPortChains() {
+        Iterable<PortChain> portChains = service.getPortChains();
+        ObjectNode result = new ObjectMapper().createObjectNode();
+        result.set("port_chains", new PortChainCodec().encode(portChains, this));
+        return ok(result).build();
+    }
+
+    /**
+     * Get details of a specified port chain id.
+     *
+     * @param id port chain id
+     * @return 200 OK, 404 if given identifier does not exist
+     */
+    @GET
+    @Path("{chain_id}")
+    @Produces(MediaType.APPLICATION_JSON)
+    public Response getPortPain(@PathParam("chain_id") String id) {
+
+        if (!service.exists(PortChainId.portChainId(id))) {
+            return Response.status(NOT_FOUND).entity(PORT_CHAIN_NOT_FOUND).build();
+        }
+        PortChain portChain = nullIsNotFound(service.getPortChain(PortChainId.portChainId(id)),
+                                             PORT_CHAIN_NOT_FOUND);
+        ObjectNode result = new ObjectMapper().createObjectNode();
+        result.set("port_chain", new PortChainCodec().encode(portChain, this));
+        return ok(result).build();
+    }
+
+    /**
+     * Creates a new port chain.
+     *
+     * @param stream port chain from JSON
+     * @return status of the request - CREATED if the JSON is correct,
+     * BAD_REQUEST if the JSON is invalid
+     */
+    @POST
+    @Consumes(MediaType.APPLICATION_JSON)
+    @Produces(MediaType.APPLICATION_JSON)
+    public Response createPortChain(InputStream stream) {
+        try {
+            ObjectNode jsonTree = (ObjectNode) mapper().readTree(stream);
+            PortChain portChain = codec(PortChain.class).decode(jsonTree, this);
+            Boolean issuccess = nullIsNotFound(service.createPortChain(portChain), PORT_CHAIN_NOT_FOUND);
+            return Response.status(OK).entity(issuccess.toString()).build();
+        } catch (IOException e) {
+            log.error("Exception while creating port chain {}.", e.toString());
+            throw new IllegalArgumentException(e);
+        }
+    }
+
+    /**
+     * Update details of a specified port chain id.
+     *
+     * @param id port chain id
+     * @param stream port chain json
+     * @return 200 OK, 404 if given identifier does not exist
+     */
+    @PUT
+    @Path("{chain_id}")
+    @Produces(MediaType.APPLICATION_JSON)
+    @Consumes(MediaType.APPLICATION_JSON)
+    public Response updatePortPain(@PathParam("chain_id") String id,
+                                   final InputStream stream) {
+        try {
+            ObjectNode jsonTree = (ObjectNode) mapper().readTree(stream);
+            PortChain portChain = codec(PortChain.class).decode(jsonTree, this);
+            Boolean result = nullIsNotFound(service.updatePortChain(portChain), PORT_CHAIN_NOT_FOUND);
+            return Response.status(OK).entity(result.toString()).build();
+        } catch (IOException e) {
+            log.error("Update port chain failed because of exception {}.", e.toString());
+            throw new IllegalArgumentException(e);
+        }
+    }
+
+    /**
+     * Delete details of a specified port chain id.
+     *
+     * @param id port chain id
+     */
+    @Path("{chain_id}")
+    @DELETE
+    public void deletePortPain(@PathParam("chain_id") String id) {
+        log.debug("Deletes port chain by identifier {}.", id);
+        PortChainId portChainId = PortChainId.portChainId(id);
+
+        Boolean issuccess = nullIsNotFound(service.removePortChain(portChainId), PORT_CHAIN_NOT_FOUND);
+        if (!issuccess) {
+            log.debug("Port Chain identifier {} does not exist", id);
+        }
+    }
+}