[ONOS-3110] PortPairWebResource for SFC

Change-Id: I58c6d915c0c07312632e9fdba9c2daeae4e0e6e4

+/*
+ * 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.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.PortPair;
+import org.onosproject.vtnrsc.PortPairId;
+import org.onosproject.vtnrsc.portpair.PortPairService;
+import org.onosproject.vtnweb.web.PortPairCodec;
+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 pair.
+ */
+@Path("port_pairs")
+public class PortPairWebResource extends AbstractWebResource {
+
+    private final Logger log = LoggerFactory.getLogger(PortPairWebResource.class);
+    private final PortPairService service = get(PortPairService.class);
+    public static final String PORT_PAIR_NOT_FOUND = "Port pair not found";
+    public static final String PORT_PAIR_ID_EXIST = "Port pair exists";
+    public static final String PORT_PAIR_ID_NOT_EXIST = "Port pair does not exist with identifier";
+
+    /**
+     * Get details of all port pairs created.
+     *
+     * @return 200 OK
+     */
+    @GET
+    @Produces(MediaType.APPLICATION_JSON)
+    public Response getPortPairs() {
+        Iterable<PortPair> portPairs = service.getPortPairs();
+        ObjectNode result = new ObjectMapper().createObjectNode();
+        result.set("port_pairs", new PortPairCodec().encode(portPairs, this));
+        return ok(result).build();
+    }
+
+    /**
+     * Get details of a specified port pair id.
+     *
+     * @param id port pair id
+     * @return 200 OK, 404 if given identifier does not exist
+     */
+    @GET
+    @Path("{pair_id}")
+    @Produces(MediaType.APPLICATION_JSON)
+    public Response getPortPair(@PathParam("portPairId") String id) {
+
+        if (!service.exists(PortPairId.portPairId(id))) {
+            return Response.status(NOT_FOUND)
+                    .entity(PORT_PAIR_NOT_FOUND).build();
+        }
+        PortPair portPair = nullIsNotFound(service.getPortPair(PortPairId.portPairId(id)),
+                                           PORT_PAIR_NOT_FOUND);
+
+        ObjectNode result = new ObjectMapper().createObjectNode();
+        result.set("port_pair", new PortPairCodec().encode(portPair, this));
+        return ok(result).build();
+    }
+
+    /**
+     * Creates a new port pair.
+     *
+     * @param stream port pair 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 createPortPair(InputStream stream) {
+        try {
+            ObjectNode jsonTree = (ObjectNode) mapper().readTree(stream);
+
+            PortPair portPair = codec(PortPair.class).decode(jsonTree, this);
+            Boolean isSuccess = nullIsNotFound(service.createPortPair(portPair),
+                                               PORT_PAIR_NOT_FOUND);
+            return Response.status(OK).entity(isSuccess.toString()).build();
+        } catch (IOException e) {
+            log.error("Exception while creating port pair {}.", e.toString());
+            throw new IllegalArgumentException(e);
+        }
+    }
+
+    /**
+     * Update details of a specified port pair id.
+     *
+     * @param id port pair id
+     * @param stream port pair from json
+     * @return 200 OK, 404 if the given identifier does not exist
+     */
+    @PUT
+    @Path("{pair_id}")
+    @Produces(MediaType.APPLICATION_JSON)
+    @Consumes(MediaType.APPLICATION_JSON)
+    public Response updatePortPair(@PathParam("pair_id") String id,
+                                   final InputStream stream) {
+        try {
+            ObjectNode jsonTree = (ObjectNode) mapper().readTree(stream);
+            PortPair portPair = codec(PortPair.class).decode(jsonTree, this);
+            Boolean isSuccess = nullIsNotFound(service.updatePortPair(portPair), PORT_PAIR_NOT_FOUND);
+            return Response.status(OK).entity(isSuccess.toString()).build();
+        } catch (IOException e) {
+            log.error("Update port pair failed because of exception {}.", e.toString());
+            throw new IllegalArgumentException(e);
+        }
+    }
+
+    /**
+     * Delete details of a specified port pair id.
+     *
+     * @param id port pair id
+     */
+    @Path("{pair_id}")
+    @DELETE
+    public void deletePortPair(@PathParam("pair_id") String id) {
+
+        PortPairId portPairId = PortPairId.portPairId(id);
+        Boolean isSuccess = nullIsNotFound(service.removePortPair(portPairId),
+                                           PORT_PAIR_NOT_FOUND);
+        if (!isSuccess) {
+            log.debug("Port pair identifier {} does not exist", id);
+        }
+    }
+}