/*

  * 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.apache.shindig.social.core.util.atom;

 import com.thoughtworks.xstream.converters.Converter;

 import com.thoughtworks.xstream.converters.MarshallingContext;

 import com.thoughtworks.xstream.converters.UnmarshallingContext;

 import com.thoughtworks.xstream.io.HierarchicalStreamReader;

 import com.thoughtworks.xstream.io.HierarchicalStreamWriter;

 /**

  * Serializes links for atom, taking account of attributes.

  */

 public class AtomLinkConverter implements Converter {

   /**

    * {@inheritDoc}

    *

    * @see com.thoughtworks.xstream.converters.Converter#marshal(java.lang.Object,

    *      com.thoughtworks.xstream.io.HierarchicalStreamWriter,

    *      com.thoughtworks.xstream.converters.MarshallingContext)

    */

   public void marshal(Object object, HierarchicalStreamWriter writer,

       MarshallingContext context) {

     AtomLink link = (AtomLink) object;

     if (link.getRel() != null) {

       writer.addAttribute("rel", link.getRel());

     }

     if (link.getHref() != null) {

       writer.setValue(link.getHref());

     }

   }

   /**

    * {@inheritDoc}

    *

    * @see com.thoughtworks.xstream.converters.Converter#unmarshal(com.thoughtworks.xstream.io.HierarchicalStreamReader,

    *      com.thoughtworks.xstream.converters.UnmarshallingContext)

    */

   public Object unmarshal(HierarchicalStreamReader reader,

       UnmarshallingContext context) {

     reader.moveDown();

     AtomLink al = new AtomLink(reader.getAttribute("rel"), reader.getValue());

     reader.moveUp();

     return al;

   }

   /**

    * {@inheritDoc}

    *

    * @see com.thoughtworks.xstream.converters.ConverterMatcher#canConvert(java.lang.Class)

    */

   public boolean canConvert(Class clazz) {

     return AtomLink.class.equals(clazz);

   }

 }