/**
 * 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.sqs.xml;

import java.net.URI;
import java.util.Map;

import javax.inject.Inject;
import javax.inject.Provider;
import javax.ws.rs.core.UriBuilder;

import org.jclouds.sqs.domain.Queue;
import org.jclouds.http.functions.ParseSax;
import org.jclouds.location.Region;

import com.google.common.collect.ImmutableBiMap;

/**
 * 
 * @see <a href=
 *      "http://docs.amazonwebservices.com/AWSSimpleQueueService/latest/APIReference/Query_QueryListQueues.html"
 *      />
 * @author Adrian Cole
 */
public class QueueHandler extends ParseSax.HandlerWithResult<Queue> {

   private StringBuilder currentText = new StringBuilder();
   Queue queue;

   private final ImmutableBiMap<URI, String> regionBiMap;
   private final Provider<UriBuilder> uriBuilderProvider;

   @Inject
   QueueHandler(Provider<UriBuilder> uriBuilderProvider, @Region Map<String, URI> regionMap) {
      this.uriBuilderProvider = uriBuilderProvider;
      this.regionBiMap = ImmutableBiMap.<String, URI> copyOf(regionMap).inverse();
   }

   public Queue getResult() {
      return queue;
   }

   public void endElement(String uri, String name, String qName) {

      if (qName.equals("QueueUrl")) {
         String uriText = currentText.toString().trim();
         String queueName = uriText.substring(uriText.lastIndexOf('/') + 1);
         URI location = URI.create(uriText);
         URI regionURI = uriBuilderProvider.get().uri(location).replacePath("").build();
         String region = regionBiMap.get(regionURI);
         this.queue = new Queue(region, queueName, location);
      }
      currentText = new StringBuilder();
   }

   public void characters(char ch[], int start, int length) {
      currentText.append(ch, start, length);
   }
}
