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    import java.text.MessageFormat;
023    import java.util.ResourceBundle;
024    
025    import javax.servlet.jsp.JspWriter;
026    
027    import org.apache.wiki.WikiContext;
028    import org.apache.wiki.WikiEngine;
029    import org.apache.wiki.i18n.InternationalizationManager;
030    import org.apache.wiki.preferences.Preferences;
031    import org.apache.wiki.rss.RSSGenerator;
032    
033    /**
034     *  Writes an image link to a JSPWiki RSS file.  If RSS generation has
035     *  been turned off in jspwiki.properties, returns an empty string.
036     *
037     *  @since 2.0
038     */
039    public class RSSImageLinkTag
040        extends WikiTagBase
041    {
042        private static final long serialVersionUID = 0L;
043        
044        protected String m_title;
045        private   String m_mode;
046        private   String m_pageName;
047        
048        /**
049         *  {@inheritDoc}
050         */
051        @Override
052        public void initTag()
053        {
054            super.initTag();
055            m_title = null;
056            m_mode  = RSSGenerator.MODE_FULL;
057            m_pageName = null;
058        }
059    
060        /**
061         *  Sets the title for the link.  If not defined, no title is shown.
062         *  
063         *  @param title A string for the title.
064         */
065        public void setTitle( String title )
066        {
067            m_title = title;
068        }
069    
070        public void setMode( String mode )
071        {
072            m_mode = mode;
073        }
074      
075        
076        /**
077         *  Returns the title.
078         *  
079         *  @return The title.
080         */
081        public String getTitle()
082        {
083            return m_title;
084        }
085    
086        /**
087         *  {@inheritDoc}
088         */
089        @Override
090        public final int doWikiStartTag()
091            throws IOException
092        {
093            WikiEngine engine = m_wikiContext.getEngine();
094            JspWriter out = pageContext.getOut();
095            ResourceBundle rb = Preferences.getBundle( m_wikiContext, InternationalizationManager.CORE_BUNDLE );
096    
097            if( engine.getRSSGenerator() != null && engine.getRSSGenerator().isEnabled() )
098            {
099                if( RSSGenerator.MODE_FULL.equals(m_mode) )
100                {
101                    String rssURL = engine.getGlobalRSSURL();
102    
103                    if( rssURL != null )
104                    {
105                        out.print("<a class=\"feed\" href=\""+rssURL+"\">&nbsp;</a>");
106                    }
107                }
108                else
109                {
110                    String page = m_pageName != null ? m_pageName : m_wikiContext.getPage().getName();
111                
112                    String params = "page="+page+"&mode="+m_mode;
113                    out.print( "<a href='"+m_wikiContext.getURL( WikiContext.NONE, "rss.jsp", params ));
114                    out.print( "' class='feed'" );
115                    out.print( " title='"+MessageFormat.format( rb.getString( "rss.title" ), page )+"'>" );
116                    out.print( "&nbsp;</a> ");
117                }
118            }
119            
120            return SKIP_BODY;
121        }
122    }