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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF 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.aws.ec2.xml;

import java.util.Set;

import javax.inject.Inject;

import org.jclouds.aws.ec2.domain.SpotInstanceRequest;
import org.jclouds.http.HttpRequest;
import org.jclouds.http.functions.ParseSax;
import org.jclouds.http.functions.ParseSax.HandlerWithResult;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;

import shaded.com.google.common.collect.ImmutableSet;
import shaded.com.google.common.collect.ImmutableSet.Builder;

public class SpotInstancesHandler extends ParseSax.HandlerWithResult> {

   private final Builder spotRequests = ImmutableSet.builder();
   private final SpotInstanceHandler spotRequestHandler;
   private int itemDepth;

   @Inject
   public SpotInstancesHandler(SpotInstanceHandler spotRequestHandler) {
      this.spotRequestHandler = spotRequestHandler;
   }

   public Set getResult() {
      return spotRequests.build();
   }

   @Override
   public HandlerWithResult> setContext(HttpRequest request) {
      spotRequestHandler.setContext(request);
      return super.setContext(request);
   }

   @Override
   public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {
      if (qName.equals("item"))
         itemDepth++;
      if (itemDepth >= 1)
         spotRequestHandler.startElement(uri, localName, qName, attributes);
   }

   @Override
   public void endElement(String uri, String localName, String qName) throws SAXException {
      if (qName.equals("item") && itemDepth == 1) {
         spotRequests.add(spotRequestHandler.getResult());
      }
      if (qName.equals("item"))
         itemDepth--;
      if (itemDepth >= 1)
         spotRequestHandler.endElement(uri, localName, qName);
   }

   public void characters(char[] ch, int start, int length) {
      if (itemDepth >= 1)
         spotRequestHandler.characters(ch, start, length);
   }

}