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 * Outputs the version number of the previous version of this page. 027 * 028 * @since 2.2 029 */ 030 public class PreviousVersionTag 031 extends WikiTagBase 032 { 033 private static final long serialVersionUID = 0L; 034 035 /** 036 * {@inheritDoc} 037 */ 038 @Override 039 public final int doWikiStartTag() 040 throws IOException 041 { 042 WikiPage page = m_wikiContext.getPage(); 043 044 int version = page.getVersion(); 045 046 version--; 047 048 if( version > 0 ) 049 pageContext.getOut().print( version ); 050 051 return SKIP_BODY; 052 } 053 }