com.liferay.portal.kernel.util.TimeZoneUtil.java Source code

Introduction

Here is the source code for com.liferay.portal.kernel.util.TimeZoneUtil.java

Source

/**
 * Copyright (c) 2000-present Liferay, Inc. All rights reserved.
 *
 * 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.
 */

package com.liferay.portal.kernel.util;

import com.liferay.petra.string.StringPool;

import java.util.Map;
import java.util.TimeZone;
import java.util.concurrent.ConcurrentHashMap;

/**
 * @author Brian Wing Shun Chan
 * @author Raymond Aug
 */
public class TimeZoneUtil {

    public static final TimeZone GMT = TimeZone.getTimeZone("GMT");

    public static TimeZone getDefault() {
        TimeZone timeZone = TimeZoneThreadLocal.getDefaultTimeZone();

        if (timeZone != null) {
            return timeZone;
        }

        return _timeZone;
    }

    public static TimeZoneUtil getInstance() {
        return new TimeZoneUtil();
    }

    public static TimeZone getTimeZone(String timeZoneId) {
        TimeZone timeZone = _timeZones.get(timeZoneId);

        if (timeZone == null) {
            timeZone = TimeZone.getTimeZone(timeZoneId);

            _timeZones.put(timeZoneId, timeZone);
        }

        return timeZone;
    }

    public static void setDefault(String timeZoneId) {
        if (Validator.isNotNull(timeZoneId)) {
            _timeZone = TimeZone.getTimeZone(timeZoneId);
        }
    }

    private TimeZoneUtil() {
    }

    private static volatile TimeZone _timeZone = TimeZone.getTimeZone(StringPool.UTC);
    private static final Map<String, TimeZone> _timeZones = new ConcurrentHashMap<>();

}