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.WikiEngine;
024    import org.apache.wiki.WikiPage;
025    import org.apache.wiki.attachment.Attachment;
026    
027    /**
028     *  Returns the parent of the currently requested page.  Weblog entries are recognized
029     *  as subpages of the weblog page.
030     *
031     *  @since 2.0
032     */
033    public class ParentPageNameTag
034        extends WikiTagBase
035    {
036        private static final long serialVersionUID = 0L;
037        
038        /**
039         * {@inheritDoc}
040         */
041        @Override
042        public final int doWikiStartTag()
043            throws IOException
044        {
045            WikiEngine engine = m_wikiContext.getEngine();
046            WikiPage   page   = m_wikiContext.getPage();
047    
048            if( page != null )
049            {
050                if( page instanceof Attachment )
051                {
052                    pageContext.getOut().print( engine.beautifyTitle( ((Attachment)page).getParentName()) );
053                }
054                else
055                {
056                    String name = page.getName();
057    
058                    int entrystart = name.indexOf("_blogentry_");
059    
060                    if( entrystart != -1 )
061                    {
062                        name = name.substring( 0, entrystart );
063                    }
064    
065                    int commentstart = name.indexOf("_comments_");
066    
067                    if( commentstart != -1 )
068                    {
069                        name = name.substring( 0, commentstart );
070                    }
071    
072                    pageContext.getOut().print( engine.beautifyTitle(name) );
073                }
074            }
075    
076            return SKIP_BODY;
077        }
078    }