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.util.Date; 022import java.text.SimpleDateFormat; 023import java.io.IOException; 024 025import org.apache.wiki.WikiPage; 026import org.apache.wiki.preferences.Preferences; 027import org.apache.wiki.preferences.Preferences.TimeFormat; 028 029/** 030 * Writes the modification date of the page, formatted 031 * as specified in the attribute "format". 032 * 033 * <UL> 034 * <LI>format = A string describing which format you want to use. 035 * This is exactly like in "java.text.SimpleDateFormat". 036 * </UL> 037 * 038 * @since 2.0 039 */ 040 041// FIXME: Should also take the current user TimeZone into account. 042 043public class PageDateTag 044 extends WikiTagBase 045{ 046 private static final long serialVersionUID = 0L; 047 048 public static final String DEFAULT_FORMAT = "dd-MMM-yyyy HH:mm:ss zzz"; 049 050 private String m_format = null; 051 052 public void initTag() 053 { 054 super.initTag(); 055 m_format = null; 056 } 057 058 public String getFormat() 059 { 060 return m_format; 061 } 062 063 public void setFormat( String arg ) 064 { 065 m_format = arg; 066 } 067 068 public final int doWikiStartTag() 069 throws IOException 070 { 071 WikiPage page = m_wikiContext.getPage(); 072 073 if( page != null ) 074 { 075 Date d = page.getLastModified(); 076 077 // 078 // Date may be null if the page does not exist. 079 // 080 if( d != null ) 081 { 082 SimpleDateFormat fmt; 083 084 if( m_format == null ) 085 fmt = Preferences.getDateFormat( m_wikiContext, TimeFormat.DATETIME ); 086 else 087 fmt = new SimpleDateFormat( m_format ); 088 089 pageContext.getOut().write( fmt.format( d ) ); 090 } 091 else 092 { 093 pageContext.getOut().write( "<never>" ); 094 } 095 } 096 097 return SKIP_BODY; 098 } 099}