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 */
019package org.apache.wiki.tags;
020
021import java.io.IOException;
022
023import org.apache.wiki.WikiPage;
024import 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 */
037public 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}