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/**
 * 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.savvis.vpdc.xml;

import static org.jclouds.savvis.vpdc.util.Utils.cleanseAttributes;
import static org.jclouds.savvis.vpdc.util.Utils.currentOrNull;
import static org.jclouds.savvis.vpdc.util.Utils.newResource;
import static org.jclouds.util.SaxUtils.equalsOrSuffix;

import java.util.Map;

import org.jclouds.http.functions.ParseSax;
import org.jclouds.savvis.vpdc.domain.Network;
import org.jclouds.savvis.vpdc.domain.Resource;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;

import com.google.common.collect.ImmutableMap;

/**
 * @author Adrian Cole
 */
public class NetworkHandler extends ParseSax.HandlerWithResult {

   protected StringBuilder currentText = new StringBuilder();

   protected Network.Builder builder = Network.builder();

   public Network getResult() {
      try {
         return builder.build();
      } finally {
         builder = Network.builder();
      }
   }

   @Override
   public void startElement(String uri, String localName, String qName, Attributes attrs) throws SAXException {
      Map attributes = cleanseAttributes(attrs);
      if (equalsOrSuffix(qName, "Network")) {
         // savvis doesn't add href in the header for some reason
         if (!attributes.containsKey("href") && getRequest() != null)
            attributes = ImmutableMap. builder().putAll(attributes)
                  .put("href", getRequest().getEndpoint().toASCIIString()).build();
         Resource org = newResource(attributes);
         builder.name(org.getName()).type(org.getType()).id(org.getId()).href(org.getHref());
      } else if (equalsOrSuffix(qName, "NatRule")) {
         builder.internalToExternalNATRule(attributes.get("internalIP"), attributes.get("externalIP"));
      }
   }

   public void endElement(String uri, String name, String qName) {
      if (equalsOrSuffix(qName, "Gateway")) {
         builder.gateway(currentOrNull(currentText));
      } else if (equalsOrSuffix(qName, "Netmask")) {
         builder.netmask(currentOrNull(currentText));
      }
      currentText = new StringBuilder();
   }

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