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comparison: src/net/fortuna/ical4j/util/TimeZones.java
src/net/fortuna/ical4j/util/TimeZones.java
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| 1 /** | |
| 2 * Copyright (c) 2012, Ben Fortuna | |
| 3 * All rights reserved. | |
| 4 * | |
| 5 * Redistribution and use in source and binary forms, with or without | |
| 6 * modification, are permitted provided that the following conditions | |
| 7 * are met: | |
| 8 * | |
| 9 * o Redistributions of source code must retain the above copyright | |
| 10 * notice, this list of conditions and the following disclaimer. | |
| 11 * | |
| 12 * o Redistributions in binary form must reproduce the above copyright | |
| 13 * notice, this list of conditions and the following disclaimer in the | |
| 14 * documentation and/or other materials provided with the distribution. | |
| 15 * | |
| 16 * o Neither the name of Ben Fortuna nor the names of any other contributors | |
| 17 * may be used to endorse or promote products derived from this software | |
| 18 * without specific prior written permission. | |
| 19 * | |
| 20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
| 21 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
| 22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |
| 23 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR | |
| 24 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, | |
| 25 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, | |
| 26 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR | |
| 27 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF | |
| 28 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING | |
| 29 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS | |
| 30 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 31 */ | |
| 32 package net.fortuna.ical4j.util; | |
| 33 | |
| 34 import java.util.TimeZone; | |
| 35 | |
| 36 /** | |
| 37 * $Id$ [5/07/2004] | |
| 38 * | |
| 39 * Utility methods relevant to Java timezones. | |
| 40 * | |
| 41 * @author Ben Fortuna | |
| 42 */ | |
| 43 public final class TimeZones { | |
| 44 | |
| 45 /** | |
| 46 * The timezone identifier for UTC time. | |
| 47 */ | |
| 48 public static final String UTC_ID = "Etc/UTC"; | |
| 49 | |
| 50 /** | |
| 51 * The timezone identifier for UTC time in the IBM JVM. | |
| 52 */ | |
| 53 public static final String IBM_UTC_ID = "GMT"; | |
| 54 | |
| 55 /** | |
| 56 * The timezone identifier for GMT time. | |
| 57 */ | |
| 58 public static final String GMT_ID = "Etc/GMT"; | |
| 59 | |
| 60 private static final TimeZone UTC_TIMEZONE; | |
| 61 static { | |
| 62 UTC_TIMEZONE = TimeZone.getTimeZone(UTC_ID); | |
| 63 } | |
| 64 | |
| 65 /** | |
| 66 * Constructor made private to enforce static nature. | |
| 67 */ | |
| 68 private TimeZones() { | |
| 69 } | |
| 70 | |
| 71 /** | |
| 72 * Indicates whether the specified timezone is equivalent to | |
| 73 * UTC time. | |
| 74 * @param timezone a timezone instance | |
| 75 * @return true if the timezone is UTC time, otherwise false | |
| 76 */ | |
| 77 public static boolean isUtc(final TimeZone timezone) { | |
| 78 // return timezone.hasSameRules(TimeZone.getTimeZone(UTC_ID)); | |
| 79 // return timezone.getRawOffset() == 0; | |
| 80 return UTC_ID.equals(timezone.getID()) | |
| 81 || IBM_UTC_ID.equals(timezone.getID()); | |
| 82 } | |
| 83 | |
| 84 /** | |
| 85 * Although timezones are not really applicable to DATE instances in iCalendar, the implementation | |
| 86 * in iCal4j requires the use of a timezone. Dates in iCal4j may be either "floating", in that they | |
| 87 * use the default Java timezone, or alternatively will use UTC (this is the default). | |
| 88 * | |
| 89 * The use of floating dates may be configured by specifying the following as a system property or in | |
| 90 * a file called "ical4j.properties" in the classpath: | |
| 91 * | |
| 92 * <pre>net.fortuna.ical4j.timezone.date.floating=true</pre> | |
| 93 * | |
| 94 * @return the timezone used for date instances | |
| 95 */ | |
| 96 public static TimeZone getDateTimeZone() { | |
| 97 if ("true".equals(Configurator.getProperty("net.fortuna.ical4j.timezone.date.floating"))) { | |
| 98 return TimeZone.getDefault(); | |
| 99 } | |
| 100 return getUtcTimeZone(); | |
| 101 } | |
| 102 | |
| 103 /** | |
| 104 * Get the UTC Timezone. | |
| 105 */ | |
| 106 public static TimeZone getUtcTimeZone() { | |
| 107 return UTC_TIMEZONE; | |
| 108 } | |
| 109 } |
