package org.apache.archiva.rss;

 /*

  * 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.

  */

 import java.util.ArrayList;

 import java.util.List;

 import org.slf4j.Logger;

 import org.slf4j.LoggerFactory;

 import com.sun.syndication.feed.synd.SyndContent;

 import com.sun.syndication.feed.synd.SyndContentImpl;

 import com.sun.syndication.feed.synd.SyndEntry;

 import com.sun.syndication.feed.synd.SyndEntryImpl;

 import com.sun.syndication.feed.synd.SyndFeed;

 import com.sun.syndication.feed.synd.SyndFeedImpl;

 /**

  * Generates RSS feeds.

  * 

  * @plexus.component role="org.apache.archiva.rss.RssFeedGenerator" 

  *      instantiation-strategy="per-lookup"

  * 

  * @version

  */

 public class RssFeedGenerator

 {

     private Logger log = LoggerFactory.getLogger( RssFeedGenerator.class );

     // TODO: make configurable

     public static String DEFAULT_FEEDTYPE = "rss_2.0";

     public static String DEFAULT_LANGUAGE = "en-us";

     public SyndFeed generateFeed( String title, String description, List<RssFeedEntry> dataEntries )

     {

         if( dataEntries.size() ==  0 )

         {

             log.debug( "No updates found, feed not generated." );

             return null;

         }

         SyndFeed feed = new SyndFeedImpl();

         feed.setTitle( title );        

         feed.setDescription( description );

         feed.setLanguage( DEFAULT_LANGUAGE );

         feed.setPublishedDate( dataEntries.get( dataEntries.size() - 1 ).getPublishedDate() );

         feed.setFeedType( DEFAULT_FEEDTYPE );

         feed.setEntries( getEntries( dataEntries ) );

         log.debug( "Finished generating the feed \'" + title + "\'." );

         return feed;

     }

     private List<SyndEntry> getEntries( List<RssFeedEntry> dataEntries )

     {

         List<SyndEntry> entries = new ArrayList<SyndEntry>();

         SyndEntry entry;

         SyndContent description;

         for ( RssFeedEntry dataEntry : dataEntries )

         {

             entry = new SyndEntryImpl();

             entry.setTitle( dataEntry.getTitle() );

             entry.setPublishedDate( dataEntry.getPublishedDate() );

             description = new SyndContentImpl();

             description.setType( "text/plain" );

             description.setValue( dataEntry.getDescription() );

             entry.setDescription( description );

             entries.add( entry );

         }

         return entries;

     }

 }