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.WikiEngine;
024import org.apache.wiki.WikiPage;
025import org.apache.wiki.api.exceptions.ProviderException;
026
027/**
028 *  Includes the body in case there is no such page available.
029 *
030 *  @since 2.0
031 */
032public class NoSuchPageTag
033    extends WikiTagBase
034{
035    private static final long serialVersionUID = 0L;
036    
037    private String m_pageName;
038
039    public void initTag()
040    {
041        super.initTag();
042        m_pageName = null;
043    }
044
045    public void setPage( String name )
046    {
047        m_pageName = name;
048    }
049
050    public String getPage()
051    {
052        return m_pageName;
053    }
054
055    public int doWikiStartTag()
056        throws IOException,
057               ProviderException
058    {
059        WikiEngine engine = m_wikiContext.getEngine();
060        WikiPage   page;
061
062        if( m_pageName == null )
063        {
064            page = m_wikiContext.getPage();
065        }
066        else
067        {
068            page = engine.getPage( m_pageName );
069        }
070
071        // System.out.println("Checking "+page);
072
073        if( page != null && engine.pageExists( page.getName(), page.getVersion() ) )
074        {
075            return SKIP_BODY;
076        }
077
078        return EVAL_BODY_INCLUDE;
079    }
080}