    001/*
    002 * Licensed to the Apache Software Foundation (ASF) under one or more
    003 * contributor license agreements.  See the NOTICE file distributed with
    004 * this work for additional information regarding copyright ownership.
    005 * The ASF licenses this file to You under the Apache License, Version 2.0
    006 * (the "License"); you may not use this file except in compliance with
    007 * the License.  You may obtain a copy of the License at
    008 *
    009 *      http://www.apache.org/licenses/LICENSE-2.0
    010 *
    011 * Unless required by applicable law or agreed to in writing, software
    012 * distributed under the License is distributed on an "AS IS" BASIS,
    013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    014 * See the License for the specific language governing permissions and
    015 * limitations under the License.
    016 */
    017
    018package org.apache.commons.lang3.time;
    019
    020import java.util.TimeZone;
    021
    022import org.apache.commons.lang3.ObjectUtils;
    023
    024/**
    025 * Helps to deal with {@link java.util.TimeZone}s.
    026 *
    027 * @since 3.7
    028 */
    029public class TimeZones {
    030
    031    /**
    032     * A public version of {@link java.util.TimeZone}'s package private {@code GMT_ID} field.
    033     */
    034    public static final String GMT_ID = "GMT";
    035
    036    /**
    037     * The GMT time zone.
    038     *
    039     * @since 3.13.0
    040     */
    041    public static final TimeZone GMT = TimeZone.getTimeZone(GMT_ID);
    042
    043    /**
    044     * Returns the given TimeZone if non-{@code null}, otherwise {@link TimeZone#getDefault()}.
    045     *
    046     * @param timeZone a locale or {@code null}.
    047     * @return the given locale if non-{@code null}, otherwise {@link TimeZone#getDefault()}.
    048     * @since 3.13.0
    049     */
    050    public static TimeZone toTimeZone(final TimeZone timeZone) {
    051        return ObjectUtils.getIfNull(timeZone, TimeZone::getDefault);
    052    }
    053
    054    /** Do not instantiate. */
    055    private TimeZones() {
    056    }
    057
    058}