001    /**
002     * Copyright (c) 2000-2013 Liferay, Inc. All rights reserved.
003     *
004     * This library is free software; you can redistribute it and/or modify it under
005     * the terms of the GNU Lesser General Public License as published by the Free
006     * Software Foundation; either version 2.1 of the License, or (at your option)
007     * any later version.
008     *
009     * This library is distributed in the hope that it will be useful, but WITHOUT
010     * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
011     * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
012     * details.
013     */
014    
015    package com.liferay.portal.kernel.util;
016    
017    import java.util.Comparator;
018    import java.util.Locale;
019    import java.util.TimeZone;
020    
021    /**
022     * @author Brian Wing Shun Chan
023     */
024    public class TimeZoneComparator implements Comparator<TimeZone> {
025    
026            public TimeZoneComparator() {
027            }
028    
029            /**
030             * @deprecated As of 7.0.0, replaced by {@link #TimeZoneComparator()}
031             */
032            public TimeZoneComparator(Locale locale) {
033                    _locale = locale;
034            }
035    
036            @Override
037            public int compare(TimeZone timeZone1, TimeZone timeZone2) {
038                    Integer totalOffset1 =
039                            timeZone1.getRawOffset() + timeZone1.getDSTSavings();
040                    Integer totalOffset2 =
041                            timeZone2.getRawOffset() + timeZone2.getDSTSavings();
042    
043                    int value = totalOffset1.compareTo(totalOffset2);
044    
045                    if (value == 0) {
046                            String timeZoneId1 = timeZone1.getID();
047                            String timeZoneId2 = timeZone2.getID();
048    
049                            value = timeZoneId1.compareTo(timeZoneId2);
050                    }
051    
052                    return value;
053            }
054    
055            private Locale _locale;
056    
057    }