001 /*
002 Licensed to the Apache Software Foundation (ASF) under one
003 or more contributor license agreements. See the NOTICE file
004 distributed with this work for additional information
005 regarding copyright ownership. The ASF licenses this file
006 to you under the Apache License, Version 2.0 (the
007 "License"); you may not use this file except in compliance
008 with the License. You may obtain a copy of the License at
009
010 http://www.apache.org/licenses/LICENSE-2.0
011
012 Unless required by applicable law or agreed to in writing,
013 software distributed under the License is distributed on an
014 "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015 KIND, either express or implied. See the License for the
016 specific language governing permissions and limitations
017 under the License.
018 */
019 package org.apache.wiki.tags;
020
021 import java.io.IOException;
022
023 import org.apache.wiki.WikiContext;
024 import org.apache.wiki.WikiEngine;
025 import org.apache.wiki.WikiPage;
026 import org.apache.wiki.plugin.WeblogPlugin;
027 import org.apache.wiki.rss.Feed;
028 import org.apache.wiki.util.TextUtil;
029
030 /**
031 * Outputs links to all the site feeds and APIs this Wiki/blog supports.
032 *
033 * @since 2.2
034 */
035 public class FeedDiscoveryTag
036 extends WikiTagBase
037 {
038 private static final long serialVersionUID = 0L;
039
040 public final int doWikiStartTag()
041 throws IOException
042 {
043 WikiEngine engine = m_wikiContext.getEngine();
044 WikiPage page = m_wikiContext.getPage();
045
046 String encodedName = engine.encodeName( page.getName() );
047
048 String rssURL = engine.getGlobalRSSURL();
049 String rssFeedURL = engine.getURL(WikiContext.NONE, "rss.jsp",
050 "page="+encodedName+"&mode=wiki",
051 true );
052
053 if( rssURL != null )
054 {
055 String siteName = Feed.getSiteName(m_wikiContext);
056 siteName = TextUtil.replaceEntities( siteName );
057
058 pageContext.getOut().print("<link rel=\"alternate\" type=\"application/rss+xml\" title=\"RSS wiki feed for the entire site.\" href=\""+rssURL+"\" />\n");
059 pageContext.getOut().print("<link rel=\"alternate\" type=\"application/rss+xml\" title=\"RSS wiki feed for page "+siteName+".\" href=\""+rssFeedURL+"\" />\n");
060
061 // TODO: Enable this
062 /*
063 pageContext.getOut().print("<link rel=\"service.post\" type=\"application/atom+xml\" title=\""+
064 siteName+"\" href=\""+atomPostURL+"\" />\n");
065 */
066 // FIXME: This does not work always, as plugins are not initialized until the first fetch
067 if( "true".equals(page.getAttribute(WeblogPlugin.ATTR_ISWEBLOG)) )
068 {
069 String blogFeedURL = engine.getURL(WikiContext.NONE,"rss.jsp","page="+encodedName,true);
070 String atomFeedURL = engine.getURL(WikiContext.NONE,"rss.jsp","page="+encodedName+"&type=atom",true);
071
072 pageContext.getOut().print("<link rel=\"alternate\" type=\"application/rss+xml\" title=\"RSS feed for weblog "+
073 siteName+".\" href=\""+blogFeedURL+"\" />\n");
074
075 pageContext.getOut().print("<link rel=\"service.feed\" type=\"application/atom+xml\" title=\"Atom 1.0 weblog feed for "+
076 siteName+"\" href=\""+atomFeedURL+"\" />\n");
077 }
078 }
079
080 return SKIP_BODY;
081 }
082 }