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.WikiEngine;
024    import org.apache.wiki.WikiPage;
025    import 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     */
032    public 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    }