/*
JSPWiki - a JSP-based WikiWiki clone.
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 com.ecyrd.jspwiki.rss;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Iterator;
import org.apache.ecs.xml.XML;
import com.ecyrd.jspwiki.WikiContext;
import com.ecyrd.jspwiki.WikiEngine;
import com.ecyrd.jspwiki.WikiPage;
/**
* Provides an implementation of an RSS 1.0 feed. In addition, this class is
* capable of adding RSS 1.0 Wiki Extensions to the Feed, as defined in
* <A HREF="http://usemod.com/cgi-bin/mb.pl?ModWiki">UseMod:ModWiki</A>.
*/
public class RSS10Feed extends Feed
{
/**
* Create an RSS 1.0 feed for a given context.
*
* @param context {@inheritDoc}
*/
public RSS10Feed( WikiContext context )
{
super(context);
}
private XML getRDFItems()
{
XML items = new XML( "items" );
XML rdfseq = new XML( "rdf:Seq" );
for( Iterator i = m_entries.iterator(); i.hasNext(); )
{
Entry e = (Entry)i.next();
String url = e.getURL();
rdfseq.addElement( new XML("rdf:li").addAttribute( "rdf:resource", url ) );
}
items.addElement( rdfseq );
return items;
}
private void addItemList( XML root )
{
SimpleDateFormat iso8601fmt = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'");
WikiEngine engine = m_wikiContext.getEngine();
for( Iterator i = m_entries.iterator(); i.hasNext(); )
{
Entry e = (Entry)i.next();
String url = e.getURL();
XML item = new XML( "item" );
item.addAttribute( "rdf:about", url );
item.addElement( new XML("title").addElement( format(e.getTitle()) ) );
item.addElement( new XML("link").addElement( url ) );
XML content = new XML("description");
// TODO: Add a size limiter here
content.addElement( format(e.getContent()) );
item.addElement( content );
WikiPage p = e.getPage();
if( p.getVersion() != -1 )
{
item.addElement( new XML("wiki:version").addElement( Integer.toString(p.getVersion()) ) );
}
if( p.getVersion() > 1 )
{
item.addElement( new XML("wiki:diff").addElement( engine.getURL( WikiContext.DIFF,
p.getName(),
"r1=-1",
true) ) );
}
//
// Modification date.
//
Calendar cal = Calendar.getInstance();
cal.setTime( p.getLastModified() );
cal.add( Calendar.MILLISECOND,
- (cal.get( Calendar.ZONE_OFFSET ) +
(cal.getTimeZone().inDaylightTime( p.getLastModified() ) ? cal.get( Calendar.DST_OFFSET ) : 0 )) );
item.addElement( new XML("dc:date").addElement( iso8601fmt.format( cal.getTime() )));
//
// Author
String author = e.getAuthor();
if( author == null ) author = "unknown";
XML contributor = new XML("dc:creator");
item.addElement( contributor );
/*
XML description = new XML("rdf:Description");
if( m_wikiContext.getEngine().pageExists(author) )
{
description.addAttribute( "link", engine.getURL( WikiContext.VIEW,
author,
null,
true ) );
}
description.addElement( new XML("value").addElement( format(author) ) );
contributor.addElement( description );
*/
// Not too many aggregators seem to like this. Therefore we're
// just adding the name here.
contributor.addElement( format(author) );
// PageHistory
item.addElement( new XML("wiki:history").addElement( engine.getURL( WikiContext.INFO,
p.getName(),
null,
true ) ) );
//
// Add to root
//
root.addElement( item );
}
}
private XML getChannelElement()
{
XML channel = new XML( "channel" );
channel.addAttribute("rdf:about", m_feedURL );
channel.addElement( new XML("link").addElement( m_feedURL ) );
if( m_channelTitle != null )
channel.addElement( new XML("title").addElement( format(m_channelTitle)) );
if( m_channelDescription != null )
channel.addElement( new XML("description").addElement( format(m_channelDescription)) );
if( m_channelLanguage != null )
channel.addElement( new XML("dc:language").addElement(m_channelLanguage) );
channel.setPrettyPrint( true );
channel.addElement( getRDFItems() );
return channel;
}
/**
* {@inheritDoc}
*/
@Override
public String getString()
{
XML root = new XML("rdf:RDF");
root.addAttribute( "xmlns:rdf", "http://www.w3.org/1999/02/22-rdf-syntax-ns#" );
root.addAttribute( "xmlns", "http://purl.org/rss/1.0/" );
root.addAttribute( "xmlns:dc", "http://purl.org/dc/elements/1.1/" );
root.addAttribute( "xmlns:wiki", "http://purl.org/rss/1.0/modules/wiki/" );
root.addElement( getChannelElement() );
addItemList( root );
root.setPrettyPrint( true );
return root.toString();
}
}