org.vosao.utils.DateUtil.java Source code

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Here is the source code for org.vosao.utils.DateUtil.java

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/**
 * Vosao CMS. Simple CMS for Google App Engine.
 * 
 * Copyright (C) 2009-2010 Vosao development team.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * email: vosao.dev@gmail.com
 */

package org.vosao.utils;

import java.text.DateFormat;
import java.text.Format;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.TimeZone;

import org.apache.commons.lang.StringUtils;
import org.vosao.common.VosaoContext;

public class DateUtil {

    private static final Format formatter = new SimpleDateFormat("dd.MM.yyyy");
    private static final DateFormat dateTimeFormatter = new SimpleDateFormat("dd.MM.yyyy HH:mm:ss");
    private static final DateFormat timeFormatter = new SimpleDateFormat("HH:mm");
    private static final Format headerFormatter = new SimpleDateFormat("EEE, d MMM yyyy HH:mm:ss z");

    public static String toString(final Date date) {
        if (date == null)
            return "";
        return formatter.format(date);
    }

    public static TimeZone getTimeZone() {
        return VosaoContext.getInstance().getBusiness().getTimeZone();
    }

    public static String dateTimeToString(final Date date) {
        if (date == null) {
            return "";
        }
        TimeZone tz = getTimeZone();
        if (!tz.equals(dateTimeFormatter.getTimeZone())) {
            dateTimeFormatter.setTimeZone(tz);
        }
        return dateTimeFormatter.format(date);
    }

    public static String timeToString(final Date date) {
        if (date == null) {
            return "";
        }
        TimeZone tz = getTimeZone();
        if (!tz.equals(timeFormatter.getTimeZone())) {
            timeFormatter.setTimeZone(tz);
        }
        return timeFormatter.format(date);
    }

    public static Date dateTimeToDate(final String str) throws ParseException {
        TimeZone tz = getTimeZone();
        if (!tz.equals(dateTimeFormatter.getTimeZone())) {
            dateTimeFormatter.setTimeZone(tz);
        }
        return (Date) dateTimeFormatter.parseObject(str);
    }

    public static Date toDate(final String str) throws ParseException {
        return (Date) formatter.parseObject(str);
    }

    public static String toHeaderString(final Date date) {
        if (date == null) {
            return "";
        }
        return headerFormatter.format(date);
    }

}