[ONOS-3113] Web Resource for Flow classifier in SFC

Change-Id: Id5e3a85883e8fb682bb43c45400860a3b07d05fe

+/*
+ * 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.INTERNAL_SERVER_ERROR;
+import static org.onlab.util.Tools.nullIsNotFound;
+import static javax.ws.rs.core.Response.Status.NOT_FOUND;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.net.URI;
+import java.net.URISyntaxException;
+import java.util.UUID;
+
+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.vtnrsc.FlowClassifier;
+import org.onosproject.vtnrsc.FlowClassifierId;
+import org.onosproject.rest.AbstractWebResource;
+import org.onosproject.vtnrsc.flowClassifier.FlowClassifierService;
+import org.onosproject.vtnrsc.web.FlowClassifierCodec;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.databind.node.ObjectNode;
+
+/**
+ * Query and program flow classifier.
+ */
+@Path("flow_classifiers")
+public class FlowClassifierWebResource extends AbstractWebResource {
+
+    final FlowClassifierService service = get(FlowClassifierService.class);
+    final ObjectNode root = mapper().createObjectNode();
+    public static final String FLOW_CLASSIFIER_NOT_FOUND = "Flow classifier not found";
+
+    /**
+     * Get all flow classifiers created. Returns list of all flow classifiers
+     * created.
+     *
+     * @return 200 OK
+     */
+    @GET
+    @Produces(MediaType.APPLICATION_JSON)
+    public Response getFlowClassifiers() {
+        Iterable<FlowClassifier> flowClassifiers = service.getFlowClassifiers();
+        ObjectNode result = new ObjectMapper().createObjectNode();
+        result.set("flow_classifiers", new FlowClassifierCodec().encode(flowClassifiers, this));
+        return ok(result.toString()).build();
+    }
+
+    /**
+     * Get details of a flow classifier. Returns details of a specified flow
+     * classifier id.
+     *
+     * @param id flow classifier id
+     * @return 200 OK
+     */
+    @GET
+    @Path("{flow_id}")
+    @Produces(MediaType.APPLICATION_JSON)
+    public Response getFlowClassifier(@PathParam("flow_id") String id) {
+
+        if (!service.hasFlowClassifier(FlowClassifierId.flowClassifierId(UUID.fromString(id)))) {
+            return Response.status(NOT_FOUND).entity(FLOW_CLASSIFIER_NOT_FOUND).build();
+        }
+        FlowClassifier flowClassifier = nullIsNotFound(
+                service.getFlowClassifier(FlowClassifierId.flowClassifierId(UUID.fromString(id))),
+                FLOW_CLASSIFIER_NOT_FOUND);
+
+        ObjectNode result = new ObjectMapper().createObjectNode();
+        result.set("flow_classifier", new FlowClassifierCodec().encode(flowClassifier, this));
+        return ok(result.toString()).build();
+    }
+
+    /**
+     * Creates and stores a new flow classifier.
+     *
+     * @param flowClassifierId flow classifier identifier
+     * @param stream flow classifier from JSON
+     * @return status of the request - CREATED if the JSON is correct,
+     *         BAD_REQUEST if the JSON is invalid
+     */
+    @POST
+    @Path("{flow_id}")
+    @Consumes(MediaType.APPLICATION_JSON)
+    @Produces(MediaType.APPLICATION_JSON)
+    public Response createFlowClassifier(@PathParam("flow_id") String flowClassifierId, InputStream stream) {
+        URI location;
+        try {
+            ObjectNode jsonTree = (ObjectNode) mapper().readTree(stream);
+
+            FlowClassifier flowClassifier = codec(FlowClassifier.class).decode(jsonTree, this);
+            service.createFlowClassifier(flowClassifier);
+            location = new URI(flowClassifierId);
+        } catch (IOException | URISyntaxException ex) {
+            throw new IllegalArgumentException(ex);
+        }
+        return Response.created(location).build();
+    }
+
+    /**
+     * Creates and stores a new flow classifier.
+     *
+     * @param stream flow classifier 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 createFlowClassifier(InputStream stream) {
+        URI location;
+        try {
+            ObjectNode jsonTree = (ObjectNode) mapper().readTree(stream);
+
+            FlowClassifier flowClassifier = codec(FlowClassifier.class).decode(jsonTree, this);
+            service.createFlowClassifier(flowClassifier);
+            location = new URI(flowClassifier.flowClassifierId().toString());
+        } catch (IOException | URISyntaxException ex) {
+            throw new IllegalArgumentException(ex);
+        }
+        return Response.created(location).build();
+    }
+
+    /**
+     * Update details of a flow classifier. Update details of a specified flow
+     * classifier id.
+     *
+     * @param id flow classifier id
+     * @param stream InputStream
+     * @return 200 OK
+     */
+    @PUT
+    @Path("{flow_id}")
+    @Produces(MediaType.APPLICATION_JSON)
+    @Consumes(MediaType.APPLICATION_JSON)
+    public Response updateFlowClassifier(@PathParam("flow_id") String id, final InputStream stream) {
+        try {
+            ObjectNode jsonTree = (ObjectNode) mapper().readTree(stream);
+            FlowClassifier flowClassifier = codec(FlowClassifier.class).decode(jsonTree, this);
+            Boolean result = nullIsNotFound(service.updateFlowClassifier(flowClassifier), FLOW_CLASSIFIER_NOT_FOUND);
+            if (!result) {
+                return Response.status(204).entity(FLOW_CLASSIFIER_NOT_FOUND).build();
+            }
+            return Response.status(203).entity(result.toString()).build();
+        } catch (Exception e) {
+            return Response.status(INTERNAL_SERVER_ERROR).entity(e.toString()).build();
+        }
+    }
+
+    /**
+     * Delete details of a flow classifier. Delete details of a specified flow
+     * classifier id.
+     *
+     * @param id flow classifier id
+     * @return 200 OK
+     * @throws IOException when input doesn't match.
+     */
+    @Path("{flow_id}")
+    @DELETE
+    public Response deleteFlowClassifier(@PathParam("flow_id") String id) throws IOException {
+        try {
+            FlowClassifierId flowClassifierId = FlowClassifierId.flowClassifierId(UUID.fromString(id));
+            service.removeFlowClassifier(flowClassifierId);
+            return Response.status(201).entity("SUCCESS").build();
+        } catch (Exception e) {
+            return Response.status(INTERNAL_SERVER_ERROR).entity(e.toString()).build();
+        }
+    }
+}