/*

  * Copyright 1999,2004 The Apache Software Foundation.

  * 

  * Licensed 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.commons.feedparser;

 import java.util.Iterator;

 import java.util.List;

 import org.jaxen.jdom.JDOMXPath;

 import org.jdom.Element;

 /**

  * Handles parsing Blogger.com changes.xml files.

  *

  * @author <a href="mailto:burton@apache.org">Kevin A. Burton (burtonator)</a>

  * @version $Id: ChangesFeedParser.java 373614 2006-01-30 22:31:21Z mvdb $

  */

 public class ChangesFeedParser {

     /**

      * Parse this feed.

      *

      * 

      */

     public static void parse( FeedParserListener listener,

                               org.jdom.Document doc ) throws FeedParserException {

         try {

             FeedParserState state = new FeedParserState();

             FeedVersion v = new FeedVersion();

             v.isChanges = true;

             listener.onFeedVersion( v );

             listener.init();

             FeedDirectoryParserListener fdpl = (FeedDirectoryParserListener)listener;

             //this should be the root directory.

             JDOMXPath xpath = new JDOMXPath( "/weblogUpdates/weblog" );

             List list = xpath.selectNodes( doc );

             Iterator i = list.iterator();

             while ( i.hasNext() ) {

                 Element child = (Element)i.next();

                 onWeblog( fdpl, state, child );

             }

             listener.finished();

         } catch ( Throwable t ) { throw new FeedParserException( t ); }

     }

     private static void onWeblog( FeedDirectoryParserListener listener,

                                   FeedParserState state,

                                   Element current ) throws Exception {

         String weblog = current.getAttributeValue( "url" );

         String description = current.getAttributeValue( "name" );

         String title = description;

         String feed = null;

         if ( weblog == null )

             weblog = feed;

         listener.onItem( state, title, weblog, description, feed );

     }

 }