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/**
 *
 * Copyright (C) 2011 Cloud Conscious, LLC. 
 *
 * ====================================================================
 * 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 errorHandlerProvider;
   @Resource
   protected Logger logger = Logger.NULL;

   @Inject
   VCloudUtils(Factory factory, Provider 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;
   }
}