    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    @Override
    042    public int doWikiStartTag() throws IOException {
    043        final Page p = m_wikiContext.getPage();
    044
    045        //  We just simply set the page to be our parent page and call the superclass.
    046        if( p instanceof Attachment ) {
    047            setPage( ((Attachment)p).getParentName() );
    048        } else {
    049            final String name = p.getName();
    050            final int entrystart = name.indexOf( "_blogentry_" );
    051            if( entrystart != -1 ) {
    052                setPage( name.substring( 0, entrystart ) );
    053            }
    054
    055            final int commentstart = name.indexOf( "_comments_" );
    056            if( commentstart != -1 ) {
    057                setPage( name.substring( 0, commentstart ) );
    058            }
    059        }
    060
    061        return super.doWikiStartTag();
    062    }
    063
    064}