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.WikiPage;
024    import org.apache.wiki.attachment.Attachment;
025    
026    /**
027     *  Writes a link to a parent of a Wiki page.
028     *
029     *  <P><B>Attributes</B></P>
030     *  <UL>
031     *    <LI>page - Page name to refer to.  Default is the current page.
032     *    <LI>format - either "anchor" or "url" to output either an <A>... or just the HREF part of one.
033     *  </UL>
034     *
035     *  @since 2.0
036     */
037    public class LinkToParentTag
038        extends LinkToTag
039    {
040        private static final long serialVersionUID = 0L;
041        
042        public int doWikiStartTag()
043            throws IOException
044        {
045            WikiPage p = m_wikiContext.getPage();
046    
047            //
048            //  We just simply set the page to be our parent page
049            //  and call the superclass.
050            //
051            if( p instanceof Attachment )
052            {
053                setPage( ((Attachment)p).getParentName() );
054            }
055            else
056            {
057                String name = p.getName();
058    
059                int entrystart = name.indexOf("_blogentry_");
060    
061                if( entrystart != -1 )
062                {
063                    setPage( name.substring( 0, entrystart ) );
064                }
065    
066                int commentstart = name.indexOf("_comments_");
067                    
068                if( commentstart != -1 )
069                {
070                    setPage( name.substring( 0, commentstart ) );
071                }
072            }
073    
074            return super.doWikiStartTag();
075        }
076    
077    }