Java tutorial
/** * Licensed to jclouds, Inc. (jclouds) under one or more * contributor license agreements. See the NOTICE file * distributed with this work for additional information * regarding copyright ownership. jclouds licenses this file * to you 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.jclouds.openstack.nova.v1_1.handlers; import java.io.IOException; import javax.inject.Singleton; import org.jclouds.http.HttpCommand; import org.jclouds.http.HttpErrorHandler; import org.jclouds.http.HttpResponse; import org.jclouds.http.HttpResponseException; import org.jclouds.rest.AuthorizationException; import org.jclouds.rest.ResourceNotFoundException; import org.jclouds.util.Strings2; import com.google.common.base.Throwables; import com.google.common.io.Closeables; /** * This will parse and set an appropriate exception on the command object. * * @author Adrian Cole * */ @Singleton public class NovaErrorHandler implements HttpErrorHandler { public void handleError(HttpCommand command, HttpResponse response) { // it is important to always read fully and close streams String message = parseMessage(response); Exception exception = message != null ? new HttpResponseException(command, response, message) : new HttpResponseException(command, response); try { message = message != null ? message : String.format("%s -> %s", command.getCurrentRequest().getRequestLine(), response.getStatusLine()); switch (response.getStatusCode()) { case 401: case 403: exception = new AuthorizationException(message, exception); break; case 404: if (!command.getCurrentRequest().getMethod().equals("DELETE")) { exception = new ResourceNotFoundException(message, exception); } break; case 500: if (message != null && message.indexOf("Unable to determine package for") != -1) { exception = new ResourceNotFoundException(message, exception); } } } finally { if (response.getPayload() != null) Closeables.closeQuietly(response.getPayload().getInput()); command.setException(exception); } } public String parseMessage(HttpResponse response) { if (response.getPayload() == null) return null; try { return Strings2.toStringAndClose(response.getPayload().getInput()); } catch (IOException e) { throw new RuntimeException(e); } finally { try { response.getPayload().getInput().close(); } catch (IOException e) { Throwables.propagate(e); } } } }