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 org.apache.wiki.api.core.Attachment;
022import org.apache.wiki.api.core.Page;
023
024import java.io.IOException;
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 extends LinkToTag {
038
039    private static final long serialVersionUID = 0L;
040    
041    public int doWikiStartTag() throws IOException {
042        final Page p = m_wikiContext.getPage();
043
044        //  We just simply set the page to be our parent page and call the superclass.
045        if( p instanceof Attachment ) {
046            setPage( ((Attachment)p).getParentName() );
047        } else {
048            final String name = p.getName();
049            final int entrystart = name.indexOf( "_blogentry_" );
050            if( entrystart != -1 ) {
051                setPage( name.substring( 0, entrystart ) );
052            }
053
054            final int commentstart = name.indexOf( "_comments_" );
055            if( commentstart != -1 ) {
056                setPage( name.substring( 0, commentstart ) );
057            }
058        }
059
060        return super.doWikiStartTag();
061    }
062
063}