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.WikiPage;
024    
025    /**
026     *  Writes the version of the current page.  If this is
027     *  marked as the current version, then includes body as text instead of
028     *  version number.
029     *
030     *  @since 2.0
031     */
032    public class PageVersionTag
033        extends WikiTagBase
034    {
035        private static final long serialVersionUID = 0L;
036        
037        public final int doWikiStartTag()
038            throws IOException
039        {
040            WikiPage   page   = m_wikiContext.getPage();
041    
042            if( page != null )
043            {
044                int version = page.getVersion();
045    
046                if( version > 0 )
047                {
048                    pageContext.getOut().print( Integer.toString(version) );
049                    return SKIP_BODY;
050                }
051            }
052    
053            return EVAL_BODY_INCLUDE;
054        }
055    }