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.WikiPage;
024
025/**
026 *  Writes the version number of the next version of the page.
027 *
028 *  @since 2.2
029 */
030public class NextVersionTag
031    extends WikiTagBase
032{
033    private static final long serialVersionUID = 0L;
034    
035    public final int doWikiStartTag()
036        throws IOException
037    {
038        WikiPage   page   = m_wikiContext.getPage();
039
040        int version = page.getVersion();
041
042        if( version == -1 )
043            version = -1;
044        else
045            version++;
046
047        pageContext.getOut().print( version );
048
049        return SKIP_BODY;
050    }
051}