/**
    * 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<Network> {
  
     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<String, String> 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.<String, String> 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);
     }
  }