1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/net/fortuna/ical4j/util/TimeZones.java Tue Feb 10 18:12:00 2015 +0100
1.3 @@ -0,0 +1,109 @@
1.4 +/**
1.5 + * Copyright (c) 2012, Ben Fortuna
1.6 + * All rights reserved.
1.7 + *
1.8 + * Redistribution and use in source and binary forms, with or without
1.9 + * modification, are permitted provided that the following conditions
1.10 + * are met:
1.11 + *
1.12 + * o Redistributions of source code must retain the above copyright
1.13 + * notice, this list of conditions and the following disclaimer.
1.14 + *
1.15 + * o Redistributions in binary form must reproduce the above copyright
1.16 + * notice, this list of conditions and the following disclaimer in the
1.17 + * documentation and/or other materials provided with the distribution.
1.18 + *
1.19 + * o Neither the name of Ben Fortuna nor the names of any other contributors
1.20 + * may be used to endorse or promote products derived from this software
1.21 + * without specific prior written permission.
1.22 + *
1.23 + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
1.24 + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
1.25 + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
1.26 + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
1.27 + * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
1.28 + * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
1.29 + * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
1.30 + * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
1.31 + * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
1.32 + * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
1.33 + * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.34 + */
1.35 +package net.fortuna.ical4j.util;
1.36 +
1.37 +import java.util.TimeZone;
1.38 +
1.39 +/**
1.40 + * $Id$ [5/07/2004]
1.41 + *
1.42 + * Utility methods relevant to Java timezones.
1.43 + *
1.44 + * @author Ben Fortuna
1.45 + */
1.46 +public final class TimeZones {
1.47 +
1.48 + /**
1.49 + * The timezone identifier for UTC time.
1.50 + */
1.51 + public static final String UTC_ID = "Etc/UTC";
1.52 +
1.53 + /**
1.54 + * The timezone identifier for UTC time in the IBM JVM.
1.55 + */
1.56 + public static final String IBM_UTC_ID = "GMT";
1.57 +
1.58 + /**
1.59 + * The timezone identifier for GMT time.
1.60 + */
1.61 + public static final String GMT_ID = "Etc/GMT";
1.62 +
1.63 + private static final TimeZone UTC_TIMEZONE;
1.64 + static {
1.65 + UTC_TIMEZONE = TimeZone.getTimeZone(UTC_ID);
1.66 + }
1.67 +
1.68 + /**
1.69 + * Constructor made private to enforce static nature.
1.70 + */
1.71 + private TimeZones() {
1.72 + }
1.73 +
1.74 + /**
1.75 + * Indicates whether the specified timezone is equivalent to
1.76 + * UTC time.
1.77 + * @param timezone a timezone instance
1.78 + * @return true if the timezone is UTC time, otherwise false
1.79 + */
1.80 + public static boolean isUtc(final TimeZone timezone) {
1.81 +// return timezone.hasSameRules(TimeZone.getTimeZone(UTC_ID));
1.82 +// return timezone.getRawOffset() == 0;
1.83 + return UTC_ID.equals(timezone.getID())
1.84 + || IBM_UTC_ID.equals(timezone.getID());
1.85 + }
1.86 +
1.87 + /**
1.88 + * Although timezones are not really applicable to DATE instances in iCalendar, the implementation
1.89 + * in iCal4j requires the use of a timezone. Dates in iCal4j may be either "floating", in that they
1.90 + * use the default Java timezone, or alternatively will use UTC (this is the default).
1.91 + *
1.92 + * The use of floating dates may be configured by specifying the following as a system property or in
1.93 + * a file called "ical4j.properties" in the classpath:
1.94 + *
1.95 + * <pre>net.fortuna.ical4j.timezone.date.floating=true</pre>
1.96 + *
1.97 + * @return the timezone used for date instances
1.98 + */
1.99 + public static TimeZone getDateTimeZone() {
1.100 + if ("true".equals(Configurator.getProperty("net.fortuna.ical4j.timezone.date.floating"))) {
1.101 + return TimeZone.getDefault();
1.102 + }
1.103 + return getUtcTimeZone();
1.104 + }
1.105 +
1.106 + /**
1.107 + * Get the UTC Timezone.
1.108 + */
1.109 + public static TimeZone getUtcTimeZone() {
1.110 + return UTC_TIMEZONE;
1.111 + }
1.112 +}
