Fix for ONOS-1595 - return proper status (405) when using an unsupported method

Change-Id: I66fe2d4783364d5a5b8cccba15115c818ed3a3b3

+/*
+ * 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.rest.exceptions;
+
+import javax.ws.rs.WebApplicationException;
+import javax.ws.rs.core.Response;
+
+/**
+ * Exception mapper for WebApplicationExceptions.
+ */
+public class WebApplicationExceptionMapper extends AbstractMapper<WebApplicationException> {
+
+    /**
+     * Extracts and returns the response from a WebApplicationException.
+     *
+     * @param e WebApplicationException that was thrown
+     * @return precomputed Response from the exception
+     */
+    @Override
+    public Response toResponse(WebApplicationException e) {
+        return e.getResponse();
+    }
+
+    @Override
+    public Response.Status responseStatus() {
+        // This should never be called because this class overrides toResponse()
+        throw new UnsupportedOperationException(
+                "responseStatus() for a WebApplicationException should never be called");
+    }
+}

@@ -60,6 +60,7 @@
                 org.onosproject.rest.exceptions.NotFoundMapper,
                 org.onosproject.rest.exceptions.ServerErrorMapper,
                 org.onosproject.rest.exceptions.BadRequestMapper,
+                org.onosproject.rest.exceptions.WebApplicationExceptionMapper,
                 org.onosproject.rest.JsonBodyWriter,
 
                 org.onosproject.rest.ApplicationsWebResource,

@@ -28,6 +28,10 @@ import static org.junit.Assert.fail;
  * Unit tests for bad REST requests.
  */
 public class BadRequestTest extends ResourceTest {
+
+    /**
+     * Tests the response for an invalid URL.
+     */
     @Test
     public void badUrl() {
         WebResource rs = resource();
@@ -39,4 +43,19 @@ public class BadRequestTest extends ResourceTest {
                     containsString("returned a response status of 404 Not Found"));
         }
     }
+
+    /**
+     * Tests the response for a request with a bad method.
+     */
+    @Test
+    public void badMethod() {
+        WebResource rs = resource();
+        try {
+            rs.path("hosts").delete();
+            fail("Fetch of non-existent URL did not throw an exception");
+        } catch (UniformInterfaceException ex) {
+            assertThat(ex.getMessage(),
+                    containsString("returned a response status of 405 Method Not Allowed"));
+        }
+    }
 }