Caldavsync Sources: src/net/fortuna/ical4j/util/TimeZones.java@fb9019fb1bf7

Import initial revisions of existing project AndroidCaldavSyncAdapater,
forked from upstream repository at 27e8a0f8495c92e0780d450bdf0c7cec77a03a55.

     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;

    34 import java.util.TimeZone;

    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 {

    45     /**

    46      * The timezone identifier for UTC time.

    47      */

    48     public static final String UTC_ID = "Etc/UTC";

    50     /**

    51      * The timezone identifier for UTC time in the IBM JVM.

    52      */

    53     public static final String IBM_UTC_ID = "GMT";

    55     /**

    56      * The timezone identifier for GMT time.

    57      */

    58     public static final String GMT_ID = "Etc/GMT";

    60     private static final TimeZone UTC_TIMEZONE;

    61     static {

    62         UTC_TIMEZONE = TimeZone.getTimeZone(UTC_ID);

    63     }

    65     /**

    66      * Constructor made private to enforce static nature.

    67      */

    68     private TimeZones() {

    69     }

    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     }

    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     }

   103     /**

   104      * Get the UTC Timezone.

   105      */

   106     public static TimeZone getUtcTimeZone() {

   107         return UTC_TIMEZONE;

   108     }

   109 }

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