    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 org.apache.wiki.api.core.Page;
    022import org.apache.wiki.preferences.Preferences;
    023import org.apache.wiki.preferences.Preferences.TimeFormat;
    024
    025import java.io.IOException;
    026import java.text.SimpleDateFormat;
    027import java.util.Date;
    028
    029
    030/**
    031 * Writes the modification date of the page, formatted
    032 * as specified in the attribute "format".
    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 extends WikiTagBase {
    044
    045    private static final long serialVersionUID = 0L;
    046
    047    public static final String DEFAULT_FORMAT = "dd-MMM-yyyy HH:mm:ss zzz";
    048
    049    private String m_format;
    050
    051    @Override
    052    public void initTag() {
    053        super.initTag();
    054        m_format = null;
    055    }
    056
    057    public String getFormat() {
    058        return m_format;
    059    }
    060
    061    public void setFormat( final String arg ) {
    062        m_format = arg;
    063    }
    064
    065    @Override
    066    public final int doWikiStartTag() throws IOException {
    067        final Page page = m_wikiContext.getPage();
    068        if( page != null ) {
    069            final Date d = page.getLastModified();
    070            //  Date may be null if the page does not exist.
    071            if( d != null ) {
    072                final SimpleDateFormat fmt;
    073                if( m_format == null ) {
    074                    fmt = Preferences.getDateFormat( m_wikiContext, TimeFormat.DATETIME );
    075                } else {
    076                    fmt = new SimpleDateFormat( m_format );
    077                }
    078
    079                pageContext.getOut().write( fmt.format( d ) );
    080            } else {
    081                pageContext.getOut().write( "&lt;never&gt;" );
    082            }
    083        }
    084        return SKIP_BODY;
    085    }
    086
    087}