/**
    *
    * Copyright (C) 2011 Cloud Conscious, LLC. <info@cloudconscious.com>
    *
    * ====================================================================
    * 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.jclouds.vcloud.util;
  
  import javax.annotation.Resource;
  import javax.inject.Inject;
  import javax.inject.Provider;
  import javax.inject.Singleton;
  
  import org.jclouds.http.HttpRequest;
  import org.jclouds.http.HttpResponse;
  import org.jclouds.http.functions.ParseSax;
  import org.jclouds.http.functions.ParseSax.Factory;
  import org.jclouds.logging.Logger;
  import org.jclouds.vcloud.VCloudMediaType;
  import org.jclouds.vcloud.domain.VCloudError;
  import org.jclouds.vcloud.xml.ErrorHandler;
  
  /**
   * Needed to sign and verify requests and responses.
   * 
   * @author Adrian Cole
   */
  @Singleton
  public class VCloudUtils {
     private final ParseSax.Factory factory;
     private final Provider<ErrorHandler> errorHandlerProvider;
     @Resource
     protected Logger logger = Logger.NULL;
  
     @Inject
     VCloudUtils(Factory factory, Provider<ErrorHandler> errorHandlerProvider) {
        this.factory = factory;
        this.errorHandlerProvider = errorHandlerProvider;
     }
  
     public VCloudError parseErrorFromContent(HttpRequest request, HttpResponse response) {
        // HEAD has no content
        if (response.getPayload() == null)
           return null;
        if (VCloudMediaType.ERROR_XML.equals(response.getPayload().getContentMetadata().getContentType())) {
           try {
              return (VCloudError) factory.create(errorHandlerProvider.get()).setContext(request).apply(response);
           } catch (RuntimeException e) {
              logger.warn(e, "error parsing error");
           }
        }
        return null;
     }
  }