923 lines
34 KiB
Java
923 lines
34 KiB
Java
/*
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* Copyright (c) 1996, 2013, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* (C) Copyright Taligent, Inc. 1996 - All Rights Reserved
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* (C) Copyright IBM Corp. 1996 - All Rights Reserved
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*
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* The original version of this source code and documentation is copyrighted
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* and owned by Taligent, Inc., a wholly-owned subsidiary of IBM. These
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* materials are provided under terms of a License Agreement between Taligent
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* and Sun. This technology is protected by multiple US and International
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* patents. This notice and attribution to Taligent may not be removed.
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* Taligent is a registered trademark of Taligent, Inc.
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*
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*/
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package java.util;
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import java.io.Serializable;
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import java.lang.ref.SoftReference;
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import java.security.AccessController;
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import java.security.PrivilegedAction;
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import java.util.concurrent.ConcurrentHashMap;
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import sun.misc.SharedSecrets;
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import sun.misc.JavaAWTAccess;
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import sun.security.action.GetPropertyAction;
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import sun.util.TimeZoneNameUtility;
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import sun.util.calendar.ZoneInfo;
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import sun.util.calendar.ZoneInfoFile;
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/**
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* <code>TimeZone</code> represents a time zone offset, and also figures out daylight
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* savings.
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*
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* <p>
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* Typically, you get a <code>TimeZone</code> using <code>getDefault</code>
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* which creates a <code>TimeZone</code> based on the time zone where the program
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* is running. For example, for a program running in Japan, <code>getDefault</code>
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* creates a <code>TimeZone</code> object based on Japanese Standard Time.
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*
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* <p>
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* You can also get a <code>TimeZone</code> using <code>getTimeZone</code>
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* along with a time zone ID. For instance, the time zone ID for the
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* U.S. Pacific Time zone is "America/Los_Angeles". So, you can get a
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* U.S. Pacific Time <code>TimeZone</code> object with:
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* <blockquote><pre>
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* TimeZone tz = TimeZone.getTimeZone("America/Los_Angeles");
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* </pre></blockquote>
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* You can use the <code>getAvailableIDs</code> method to iterate through
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* all the supported time zone IDs. You can then choose a
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* supported ID to get a <code>TimeZone</code>.
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* If the time zone you want is not represented by one of the
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* supported IDs, then a custom time zone ID can be specified to
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* produce a TimeZone. The syntax of a custom time zone ID is:
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*
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* <blockquote><pre>
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* <a name="CustomID"><i>CustomID:</i></a>
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* <code>GMT</code> <i>Sign</i> <i>Hours</i> <code>:</code> <i>Minutes</i>
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* <code>GMT</code> <i>Sign</i> <i>Hours</i> <i>Minutes</i>
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* <code>GMT</code> <i>Sign</i> <i>Hours</i>
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* <i>Sign:</i> one of
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* <code>+ -</code>
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* <i>Hours:</i>
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* <i>Digit</i>
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* <i>Digit</i> <i>Digit</i>
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* <i>Minutes:</i>
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* <i>Digit</i> <i>Digit</i>
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* <i>Digit:</i> one of
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* <code>0 1 2 3 4 5 6 7 8 9</code>
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* </pre></blockquote>
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*
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* <i>Hours</i> must be between 0 to 23 and <i>Minutes</i> must be
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* between 00 to 59. For example, "GMT+10" and "GMT+0010" mean ten
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* hours and ten minutes ahead of GMT, respectively.
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* <p>
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* The format is locale independent and digits must be taken from the
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* Basic Latin block of the Unicode standard. No daylight saving time
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* transition schedule can be specified with a custom time zone ID. If
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* the specified string doesn't match the syntax, <code>"GMT"</code>
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* is used.
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* <p>
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* When creating a <code>TimeZone</code>, the specified custom time
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* zone ID is normalized in the following syntax:
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* <blockquote><pre>
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* <a name="NormalizedCustomID"><i>NormalizedCustomID:</i></a>
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* <code>GMT</code> <i>Sign</i> <i>TwoDigitHours</i> <code>:</code> <i>Minutes</i>
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* <i>Sign:</i> one of
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* <code>+ -</code>
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* <i>TwoDigitHours:</i>
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* <i>Digit</i> <i>Digit</i>
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* <i>Minutes:</i>
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* <i>Digit</i> <i>Digit</i>
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* <i>Digit:</i> one of
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* <code>0 1 2 3 4 5 6 7 8 9</code>
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* </pre></blockquote>
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* For example, TimeZone.getTimeZone("GMT-8").getID() returns "GMT-08:00".
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*
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* <h4>Three-letter time zone IDs</h4>
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*
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* For compatibility with JDK 1.1.x, some other three-letter time zone IDs
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* (such as "PST", "CTT", "AST") are also supported. However, <strong>their
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* use is deprecated</strong> because the same abbreviation is often used
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* for multiple time zones (for example, "CST" could be U.S. "Central Standard
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* Time" and "China Standard Time"), and the Java platform can then only
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* recognize one of them.
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*
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*
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* @see Calendar
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* @see GregorianCalendar
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* @see SimpleTimeZone
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* @author Mark Davis, David Goldsmith, Chen-Lieh Huang, Alan Liu
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* @since JDK1.1
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*/
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abstract public class TimeZone implements Serializable, Cloneable {
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/**
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* Sole constructor. (For invocation by subclass constructors, typically
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* implicit.)
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*/
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public TimeZone() {
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}
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/**
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* A style specifier for <code>getDisplayName()</code> indicating
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* a short name, such as "PST."
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* @see #LONG
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* @since 1.2
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*/
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public static final int SHORT = 0;
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/**
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* A style specifier for <code>getDisplayName()</code> indicating
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* a long name, such as "Pacific Standard Time."
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* @see #SHORT
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* @since 1.2
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*/
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public static final int LONG = 1;
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// Constants used internally; unit is milliseconds
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private static final int ONE_MINUTE = 60*1000;
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private static final int ONE_HOUR = 60*ONE_MINUTE;
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private static final int ONE_DAY = 24*ONE_HOUR;
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// Proclaim serialization compatibility with JDK 1.1
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static final long serialVersionUID = 3581463369166924961L;
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/**
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* Gets the time zone offset, for current date, modified in case of
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* daylight savings. This is the offset to add to UTC to get local time.
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* <p>
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* This method returns a historically correct offset if an
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* underlying <code>TimeZone</code> implementation subclass
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* supports historical Daylight Saving Time schedule and GMT
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* offset changes.
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*
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* @param era the era of the given date.
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* @param year the year in the given date.
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* @param month the month in the given date.
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* Month is 0-based. e.g., 0 for January.
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* @param day the day-in-month of the given date.
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* @param dayOfWeek the day-of-week of the given date.
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* @param milliseconds the milliseconds in day in <em>standard</em>
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* local time.
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*
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* @return the offset in milliseconds to add to GMT to get local time.
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*
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* @see Calendar#ZONE_OFFSET
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* @see Calendar#DST_OFFSET
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*/
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public abstract int getOffset(int era, int year, int month, int day,
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int dayOfWeek, int milliseconds);
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/**
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* Returns the offset of this time zone from UTC at the specified
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* date. If Daylight Saving Time is in effect at the specified
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* date, the offset value is adjusted with the amount of daylight
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* saving.
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* <p>
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* This method returns a historically correct offset value if an
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* underlying TimeZone implementation subclass supports historical
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* Daylight Saving Time schedule and GMT offset changes.
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*
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* @param date the date represented in milliseconds since January 1, 1970 00:00:00 GMT
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* @return the amount of time in milliseconds to add to UTC to get local time.
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*
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* @see Calendar#ZONE_OFFSET
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* @see Calendar#DST_OFFSET
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* @since 1.4
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*/
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public int getOffset(long date) {
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if (inDaylightTime(new Date(date))) {
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return getRawOffset() + getDSTSavings();
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}
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return getRawOffset();
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}
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/**
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* Gets the raw GMT offset and the amount of daylight saving of this
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* time zone at the given time.
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* @param date the milliseconds (since January 1, 1970,
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* 00:00:00.000 GMT) at which the time zone offset and daylight
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* saving amount are found
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* @param offset an array of int where the raw GMT offset
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* (offset[0]) and daylight saving amount (offset[1]) are stored,
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* or null if those values are not needed. The method assumes that
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* the length of the given array is two or larger.
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* @return the total amount of the raw GMT offset and daylight
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* saving at the specified date.
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*
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* @see Calendar#ZONE_OFFSET
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* @see Calendar#DST_OFFSET
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*/
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int getOffsets(long date, int[] offsets) {
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int rawoffset = getRawOffset();
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int dstoffset = 0;
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if (inDaylightTime(new Date(date))) {
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dstoffset = getDSTSavings();
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}
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if (offsets != null) {
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offsets[0] = rawoffset;
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offsets[1] = dstoffset;
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}
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return rawoffset + dstoffset;
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}
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/**
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* Sets the base time zone offset to GMT.
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* This is the offset to add to UTC to get local time.
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* <p>
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* If an underlying <code>TimeZone</code> implementation subclass
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* supports historical GMT offset changes, the specified GMT
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* offset is set as the latest GMT offset and the difference from
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* the known latest GMT offset value is used to adjust all
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* historical GMT offset values.
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*
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* @param offsetMillis the given base time zone offset to GMT.
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*/
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abstract public void setRawOffset(int offsetMillis);
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/**
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* Returns the amount of time in milliseconds to add to UTC to get
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* standard time in this time zone. Because this value is not
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* affected by daylight saving time, it is called <I>raw
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* offset</I>.
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* <p>
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* If an underlying <code>TimeZone</code> implementation subclass
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* supports historical GMT offset changes, the method returns the
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* raw offset value of the current date. In Honolulu, for example,
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* its raw offset changed from GMT-10:30 to GMT-10:00 in 1947, and
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* this method always returns -36000000 milliseconds (i.e., -10
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* hours).
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*
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* @return the amount of raw offset time in milliseconds to add to UTC.
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* @see Calendar#ZONE_OFFSET
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*/
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public abstract int getRawOffset();
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/**
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* Gets the ID of this time zone.
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* @return the ID of this time zone.
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*/
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public String getID()
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{
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return ID;
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}
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/**
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* Sets the time zone ID. This does not change any other data in
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* the time zone object.
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* @param ID the new time zone ID.
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*/
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public void setID(String ID)
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{
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if (ID == null) {
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throw new NullPointerException();
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}
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this.ID = ID;
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}
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/**
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* Returns a long standard time name of this {@code TimeZone} suitable for
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* presentation to the user in the default locale.
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*
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* <p>This method is equivalent to:
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* <pre><blockquote>
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* getDisplayName(false, {@link #LONG},
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* Locale.getDefault({@link Locale.Category#DISPLAY}))
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* </blockquote></pre>
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*
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* @return the human-readable name of this time zone in the default locale.
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* @since 1.2
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* @see #getDisplayName(boolean, int, Locale)
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* @see Locale#getDefault(Locale.Category)
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* @see Locale.Category
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*/
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public final String getDisplayName() {
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return getDisplayName(false, LONG,
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Locale.getDefault(Locale.Category.DISPLAY));
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}
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/**
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* Returns a long standard time name of this {@code TimeZone} suitable for
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* presentation to the user in the specified {@code locale}.
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*
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* <p>This method is equivalent to:
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* <pre><blockquote>
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* getDisplayName(false, {@link #LONG}, locale)
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* </blockquote></pre>
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*
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* @param locale the locale in which to supply the display name.
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* @return the human-readable name of this time zone in the given locale.
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* @exception NullPointerException if {@code locale} is {@code null}.
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* @since 1.2
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* @see #getDisplayName(boolean, int, Locale)
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*/
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public final String getDisplayName(Locale locale) {
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return getDisplayName(false, LONG, locale);
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}
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/**
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* Returns a name in the specified {@code style} of this {@code TimeZone}
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* suitable for presentation to the user in the default locale. If the
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* specified {@code daylight} is {@code true}, a Daylight Saving Time name
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* is returned (even if this {@code TimeZone} doesn't observe Daylight Saving
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* Time). Otherwise, a Standard Time name is returned.
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*
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* <p>This method is equivalent to:
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* <pre><blockquote>
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* getDisplayName(daylight, style,
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* Locale.getDefault({@link Locale.Category#DISPLAY}))
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* </blockquote></pre>
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*
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* @param daylight {@code true} specifying a Daylight Saving Time name, or
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* {@code false} specifying a Standard Time name
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* @param style either {@link #LONG} or {@link #SHORT}
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* @return the human-readable name of this time zone in the default locale.
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* @exception IllegalArgumentException if {@code style} is invalid.
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* @since 1.2
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* @see #getDisplayName(boolean, int, Locale)
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* @see Locale#getDefault(Locale.Category)
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* @see Locale.Category
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* @see java.text.DateFormatSymbols#getZoneStrings()
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*/
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public final String getDisplayName(boolean daylight, int style) {
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return getDisplayName(daylight, style,
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Locale.getDefault(Locale.Category.DISPLAY));
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}
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/**
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* Returns a name in the specified {@code style} of this {@code TimeZone}
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* suitable for presentation to the user in the specified {@code
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* locale}. If the specified {@code daylight} is {@code true}, a Daylight
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* Saving Time name is returned (even if this {@code TimeZone} doesn't
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* observe Daylight Saving Time). Otherwise, a Standard Time name is
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* returned.
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*
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* <p>When looking up a time zone name, the {@linkplain
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* ResourceBundle.Control#getCandidateLocales(String,Locale) default
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* <code>Locale</code> search path of <code>ResourceBundle</code>} derived
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* from the specified {@code locale} is used. (No {@linkplain
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* ResourceBundle.Control#getFallbackLocale(String,Locale) fallback
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* <code>Locale</code>} search is performed.) If a time zone name in any
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* {@code Locale} of the search path, including {@link Locale#ROOT}, is
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* found, the name is returned. Otherwise, a string in the
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* <a href="#NormalizedCustomID">normalized custom ID format</a> is returned.
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*
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* @param daylight {@code true} specifying a Daylight Saving Time name, or
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* {@code false} specifying a Standard Time name
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* @param style either {@link #LONG} or {@link #SHORT}
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* @param locale the locale in which to supply the display name.
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* @return the human-readable name of this time zone in the given locale.
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* @exception IllegalArgumentException if {@code style} is invalid.
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* @exception NullPointerException if {@code locale} is {@code null}.
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* @since 1.2
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* @see java.text.DateFormatSymbols#getZoneStrings()
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*/
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public String getDisplayName(boolean daylight, int style, Locale locale) {
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if (style != SHORT && style != LONG) {
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throw new IllegalArgumentException("Illegal style: " + style);
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}
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String id = getID();
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String[] names = getDisplayNames(id, locale);
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if (names == null) {
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if (id.startsWith("GMT")) {
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char sign = id.charAt(3);
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if (sign == '+' || sign == '-') {
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return id;
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}
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}
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int offset = getRawOffset();
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if (daylight) {
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offset += getDSTSavings();
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}
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return ZoneInfoFile.toCustomID(offset);
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}
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int index = daylight ? 3 : 1;
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if (style == SHORT) {
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index++;
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}
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return names[index];
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}
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private static class DisplayNames {
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// Cache for managing display names per timezone per locale
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// The structure is:
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// Map(key=id, value=SoftReference(Map(key=locale, value=displaynames)))
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private static final Map<String, SoftReference<Map<Locale, String[]>>> CACHE =
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new ConcurrentHashMap<String, SoftReference<Map<Locale, String[]>>>();
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}
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private static final String[] getDisplayNames(String id, Locale locale) {
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Map<String, SoftReference<Map<Locale, String[]>>> displayNames = DisplayNames.CACHE;
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SoftReference<Map<Locale, String[]>> ref = displayNames.get(id);
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if (ref != null) {
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Map<Locale, String[]> perLocale = ref.get();
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if (perLocale != null) {
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String[] names = perLocale.get(locale);
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if (names != null) {
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return names;
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}
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names = TimeZoneNameUtility.retrieveDisplayNames(id, locale);
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if (names != null) {
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perLocale.put(locale, names);
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}
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return names;
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}
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}
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String[] names = TimeZoneNameUtility.retrieveDisplayNames(id, locale);
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if (names != null) {
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Map<Locale, String[]> perLocale = new ConcurrentHashMap<Locale, String[]>();
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perLocale.put(locale, names);
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ref = new SoftReference<Map<Locale, String[]>>(perLocale);
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displayNames.put(id, ref);
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}
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return names;
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}
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|
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/**
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* Returns the amount of time to be added to local standard time
|
|
* to get local wall clock time.
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|
*
|
|
* <p>The default implementation returns 3600000 milliseconds
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|
* (i.e., one hour) if a call to {@link #useDaylightTime()}
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* returns {@code true}. Otherwise, 0 (zero) is returned.
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|
*
|
|
* <p>If an underlying {@code TimeZone} implementation subclass
|
|
* supports historical and future Daylight Saving Time schedule
|
|
* changes, this method returns the amount of saving time of the
|
|
* last known Daylight Saving Time rule that can be a future
|
|
* prediction.
|
|
*
|
|
* <p>If the amount of saving time at any given time stamp is
|
|
* required, construct a {@link Calendar} with this {@code
|
|
* TimeZone} and the time stamp, and call {@link Calendar#get(int)
|
|
* Calendar.get}{@code (}{@link Calendar#DST_OFFSET}{@code )}.
|
|
*
|
|
* @return the amount of saving time in milliseconds
|
|
* @since 1.4
|
|
* @see #inDaylightTime(Date)
|
|
* @see #getOffset(long)
|
|
* @see #getOffset(int,int,int,int,int,int)
|
|
* @see Calendar#ZONE_OFFSET
|
|
*/
|
|
public int getDSTSavings() {
|
|
if (useDaylightTime()) {
|
|
return 3600000;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Queries if this {@code TimeZone} uses Daylight Saving Time.
|
|
*
|
|
* <p>If an underlying {@code TimeZone} implementation subclass
|
|
* supports historical and future Daylight Saving Time schedule
|
|
* changes, this method refers to the last known Daylight Saving Time
|
|
* rule that can be a future prediction and may not be the same as
|
|
* the current rule. Consider calling {@link #observesDaylightTime()}
|
|
* if the current rule should also be taken into account.
|
|
*
|
|
* @return {@code true} if this {@code TimeZone} uses Daylight Saving Time,
|
|
* {@code false}, otherwise.
|
|
* @see #inDaylightTime(Date)
|
|
* @see Calendar#DST_OFFSET
|
|
*/
|
|
public abstract boolean useDaylightTime();
|
|
|
|
/**
|
|
* Returns {@code true} if this {@code TimeZone} is currently in
|
|
* Daylight Saving Time, or if a transition from Standard Time to
|
|
* Daylight Saving Time occurs at any future time.
|
|
*
|
|
* <p>The default implementation returns {@code true} if
|
|
* {@code useDaylightTime()} or {@code inDaylightTime(new Date())}
|
|
* returns {@code true}.
|
|
*
|
|
* @return {@code true} if this {@code TimeZone} is currently in
|
|
* Daylight Saving Time, or if a transition from Standard Time to
|
|
* Daylight Saving Time occurs at any future time; {@code false}
|
|
* otherwise.
|
|
* @since 1.7
|
|
* @see #useDaylightTime()
|
|
* @see #inDaylightTime(Date)
|
|
* @see Calendar#DST_OFFSET
|
|
*/
|
|
public boolean observesDaylightTime() {
|
|
return useDaylightTime() || inDaylightTime(new Date());
|
|
}
|
|
|
|
/**
|
|
* Queries if the given {@code date} is in Daylight Saving Time in
|
|
* this time zone.
|
|
*
|
|
* @param date the given Date.
|
|
* @return {@code true} if the given date is in Daylight Saving Time,
|
|
* {@code false}, otherwise.
|
|
*/
|
|
abstract public boolean inDaylightTime(Date date);
|
|
|
|
/**
|
|
* Gets the <code>TimeZone</code> for the given ID.
|
|
*
|
|
* @param ID the ID for a <code>TimeZone</code>, either an abbreviation
|
|
* such as "PST", a full name such as "America/Los_Angeles", or a custom
|
|
* ID such as "GMT-8:00". Note that the support of abbreviations is
|
|
* for JDK 1.1.x compatibility only and full names should be used.
|
|
*
|
|
* @return the specified <code>TimeZone</code>, or the GMT zone if the given ID
|
|
* cannot be understood.
|
|
*/
|
|
public static synchronized TimeZone getTimeZone(String ID) {
|
|
return getTimeZone(ID, true);
|
|
}
|
|
|
|
private static TimeZone getTimeZone(String ID, boolean fallback) {
|
|
TimeZone tz = ZoneInfo.getTimeZone(ID);
|
|
if (tz == null) {
|
|
tz = parseCustomTimeZone(ID);
|
|
if (tz == null && fallback) {
|
|
tz = new ZoneInfo(GMT_ID, 0);
|
|
}
|
|
}
|
|
return tz;
|
|
}
|
|
|
|
/**
|
|
* Gets the available IDs according to the given time zone offset in milliseconds.
|
|
*
|
|
* @param rawOffset the given time zone GMT offset in milliseconds.
|
|
* @return an array of IDs, where the time zone for that ID has
|
|
* the specified GMT offset. For example, "America/Phoenix" and "America/Denver"
|
|
* both have GMT-07:00, but differ in daylight saving behavior.
|
|
* @see #getRawOffset()
|
|
*/
|
|
public static synchronized String[] getAvailableIDs(int rawOffset) {
|
|
return ZoneInfo.getAvailableIDs(rawOffset);
|
|
}
|
|
|
|
/**
|
|
* Gets all the available IDs supported.
|
|
* @return an array of IDs.
|
|
*/
|
|
public static synchronized String[] getAvailableIDs() {
|
|
return ZoneInfo.getAvailableIDs();
|
|
}
|
|
|
|
/**
|
|
* Gets the platform defined TimeZone ID.
|
|
**/
|
|
private static native String getSystemTimeZoneID(String javaHome,
|
|
String country);
|
|
|
|
/**
|
|
* Gets the custom time zone ID based on the GMT offset of the
|
|
* platform. (e.g., "GMT+08:00")
|
|
*/
|
|
private static native String getSystemGMTOffsetID();
|
|
|
|
/**
|
|
* Gets the default <code>TimeZone</code> for this host.
|
|
* The source of the default <code>TimeZone</code>
|
|
* may vary with implementation.
|
|
* @return a default <code>TimeZone</code>.
|
|
* @see #setDefault
|
|
*/
|
|
public static TimeZone getDefault() {
|
|
return (TimeZone) getDefaultRef().clone();
|
|
}
|
|
|
|
/**
|
|
* Returns the reference to the default TimeZone object. This
|
|
* method doesn't create a clone.
|
|
*/
|
|
static TimeZone getDefaultRef() {
|
|
TimeZone defaultZone = getDefaultInAppContext();
|
|
if (defaultZone == null) {
|
|
defaultZone = defaultTimeZone;
|
|
if (defaultZone == null) {
|
|
// Need to initialize the default time zone.
|
|
defaultZone = setDefaultZone();
|
|
assert defaultZone != null;
|
|
}
|
|
}
|
|
// Don't clone here.
|
|
return defaultZone;
|
|
}
|
|
|
|
private static synchronized TimeZone setDefaultZone() {
|
|
TimeZone tz = null;
|
|
// get the time zone ID from the system properties
|
|
String zoneID = AccessController.doPrivileged(
|
|
new GetPropertyAction("user.timezone"));
|
|
|
|
// if the time zone ID is not set (yet), perform the
|
|
// platform to Java time zone ID mapping.
|
|
if (zoneID == null || zoneID.equals("")) {
|
|
String country = AccessController.doPrivileged(
|
|
new GetPropertyAction("user.country"));
|
|
String javaHome = AccessController.doPrivileged(
|
|
new GetPropertyAction("java.home"));
|
|
try {
|
|
zoneID = getSystemTimeZoneID(javaHome, country);
|
|
if (zoneID == null) {
|
|
zoneID = GMT_ID;
|
|
}
|
|
} catch (NullPointerException e) {
|
|
zoneID = GMT_ID;
|
|
}
|
|
}
|
|
|
|
// Get the time zone for zoneID. But not fall back to
|
|
// "GMT" here.
|
|
tz = getTimeZone(zoneID, false);
|
|
|
|
if (tz == null) {
|
|
// If the given zone ID is unknown in Java, try to
|
|
// get the GMT-offset-based time zone ID,
|
|
// a.k.a. custom time zone ID (e.g., "GMT-08:00").
|
|
String gmtOffsetID = getSystemGMTOffsetID();
|
|
if (gmtOffsetID != null) {
|
|
zoneID = gmtOffsetID;
|
|
}
|
|
tz = getTimeZone(zoneID, true);
|
|
}
|
|
assert tz != null;
|
|
|
|
final String id = zoneID;
|
|
AccessController.doPrivileged(new PrivilegedAction<Object>() {
|
|
public Object run() {
|
|
System.setProperty("user.timezone", id);
|
|
return null;
|
|
}
|
|
});
|
|
|
|
defaultTimeZone = tz;
|
|
return tz;
|
|
}
|
|
|
|
private static boolean hasPermission() {
|
|
boolean hasPermission = true;
|
|
SecurityManager sm = System.getSecurityManager();
|
|
if (sm != null) {
|
|
try {
|
|
sm.checkPermission(new PropertyPermission
|
|
("user.timezone", "write"));
|
|
} catch (SecurityException e) {
|
|
hasPermission = false;
|
|
}
|
|
}
|
|
return hasPermission;
|
|
}
|
|
|
|
/**
|
|
* Sets the <code>TimeZone</code> that is
|
|
* returned by the <code>getDefault</code> method. If <code>zone</code>
|
|
* is null, reset the default to the value it had originally when the
|
|
* VM first started.
|
|
* @param zone the new default time zone
|
|
* @see #getDefault
|
|
*/
|
|
public static void setDefault(TimeZone zone)
|
|
{
|
|
if (hasPermission()) {
|
|
synchronized (TimeZone.class) {
|
|
defaultTimeZone = zone;
|
|
setDefaultInAppContext(null);
|
|
}
|
|
} else {
|
|
setDefaultInAppContext(zone);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Returns the default TimeZone in an AppContext if any AppContext
|
|
* has ever used. null is returned if any AppContext hasn't been
|
|
* used or if the AppContext doesn't have the default TimeZone.
|
|
*
|
|
* Note that javaAWTAccess may be null if sun.awt.AppContext class hasn't
|
|
* been loaded. If so, it implies that AWTSecurityManager is not our
|
|
* SecurityManager and we can use a local static variable.
|
|
* This works around a build time issue.
|
|
*/
|
|
private static TimeZone getDefaultInAppContext() {
|
|
// JavaAWTAccess provides access implementation-private methods without using reflection.
|
|
JavaAWTAccess javaAWTAccess = SharedSecrets.getJavaAWTAccess();
|
|
if (javaAWTAccess == null) {
|
|
return mainAppContextDefault;
|
|
} else {
|
|
if (!javaAWTAccess.isDisposed()) {
|
|
TimeZone tz = (TimeZone)
|
|
javaAWTAccess.get(TimeZone.class);
|
|
if (tz == null && javaAWTAccess.isMainAppContext()) {
|
|
return mainAppContextDefault;
|
|
} else {
|
|
return tz;
|
|
}
|
|
}
|
|
}
|
|
return null;
|
|
}
|
|
|
|
/**
|
|
* Sets the default TimeZone in the AppContext to the given
|
|
* tz. null is handled special: do nothing if any AppContext
|
|
* hasn't been used, remove the default TimeZone in the
|
|
* AppContext otherwise.
|
|
*
|
|
* Note that javaAWTAccess may be null if sun.awt.AppContext class hasn't
|
|
* been loaded. If so, it implies that AWTSecurityManager is not our
|
|
* SecurityManager and we can use a local static variable.
|
|
* This works around a build time issue.
|
|
*/
|
|
private static void setDefaultInAppContext(TimeZone tz) {
|
|
// JavaAWTAccess provides access implementation-private methods without using reflection.
|
|
JavaAWTAccess javaAWTAccess = SharedSecrets.getJavaAWTAccess();
|
|
if (javaAWTAccess == null) {
|
|
mainAppContextDefault = tz;
|
|
} else {
|
|
if (!javaAWTAccess.isDisposed()) {
|
|
javaAWTAccess.put(TimeZone.class, tz);
|
|
if (javaAWTAccess.isMainAppContext()) {
|
|
mainAppContextDefault = null;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Returns true if this zone has the same rule and offset as another zone.
|
|
* That is, if this zone differs only in ID, if at all. Returns false
|
|
* if the other zone is null.
|
|
* @param other the <code>TimeZone</code> object to be compared with
|
|
* @return true if the other zone is not null and is the same as this one,
|
|
* with the possible exception of the ID
|
|
* @since 1.2
|
|
*/
|
|
public boolean hasSameRules(TimeZone other) {
|
|
return other != null && getRawOffset() == other.getRawOffset() &&
|
|
useDaylightTime() == other.useDaylightTime();
|
|
}
|
|
|
|
/**
|
|
* Creates a copy of this <code>TimeZone</code>.
|
|
*
|
|
* @return a clone of this <code>TimeZone</code>
|
|
*/
|
|
public Object clone()
|
|
{
|
|
try {
|
|
TimeZone other = (TimeZone) super.clone();
|
|
other.ID = ID;
|
|
return other;
|
|
} catch (CloneNotSupportedException e) {
|
|
throw new InternalError();
|
|
}
|
|
}
|
|
|
|
/**
|
|
* The null constant as a TimeZone.
|
|
*/
|
|
static final TimeZone NO_TIMEZONE = null;
|
|
|
|
// =======================privates===============================
|
|
|
|
/**
|
|
* The string identifier of this <code>TimeZone</code>. This is a
|
|
* programmatic identifier used internally to look up <code>TimeZone</code>
|
|
* objects from the system table and also to map them to their localized
|
|
* display names. <code>ID</code> values are unique in the system
|
|
* table but may not be for dynamically created zones.
|
|
* @serial
|
|
*/
|
|
private String ID;
|
|
private static volatile TimeZone defaultTimeZone;
|
|
|
|
static final String GMT_ID = "GMT";
|
|
private static final int GMT_ID_LENGTH = 3;
|
|
|
|
// a static TimeZone we can reference if no AppContext is in place
|
|
private static volatile TimeZone mainAppContextDefault;
|
|
|
|
/**
|
|
* Parses a custom time zone identifier and returns a corresponding zone.
|
|
* This method doesn't support the RFC 822 time zone format. (e.g., +hhmm)
|
|
*
|
|
* @param id a string of the <a href="#CustomID">custom ID form</a>.
|
|
* @return a newly created TimeZone with the given offset and
|
|
* no daylight saving time, or null if the id cannot be parsed.
|
|
*/
|
|
private static final TimeZone parseCustomTimeZone(String id) {
|
|
int length;
|
|
|
|
// Error if the length of id isn't long enough or id doesn't
|
|
// start with "GMT".
|
|
if ((length = id.length()) < (GMT_ID_LENGTH + 2) ||
|
|
id.indexOf(GMT_ID) != 0) {
|
|
return null;
|
|
}
|
|
|
|
ZoneInfo zi;
|
|
|
|
// First, we try to find it in the cache with the given
|
|
// id. Even the id is not normalized, the returned ZoneInfo
|
|
// should have its normalized id.
|
|
zi = ZoneInfoFile.getZoneInfo(id);
|
|
if (zi != null) {
|
|
return zi;
|
|
}
|
|
|
|
int index = GMT_ID_LENGTH;
|
|
boolean negative = false;
|
|
char c = id.charAt(index++);
|
|
if (c == '-') {
|
|
negative = true;
|
|
} else if (c != '+') {
|
|
return null;
|
|
}
|
|
|
|
int hours = 0;
|
|
int num = 0;
|
|
int countDelim = 0;
|
|
int len = 0;
|
|
while (index < length) {
|
|
c = id.charAt(index++);
|
|
if (c == ':') {
|
|
if (countDelim > 0) {
|
|
return null;
|
|
}
|
|
if (len > 2) {
|
|
return null;
|
|
}
|
|
hours = num;
|
|
countDelim++;
|
|
num = 0;
|
|
len = 0;
|
|
continue;
|
|
}
|
|
if (c < '0' || c > '9') {
|
|
return null;
|
|
}
|
|
num = num * 10 + (c - '0');
|
|
len++;
|
|
}
|
|
if (index != length) {
|
|
return null;
|
|
}
|
|
if (countDelim == 0) {
|
|
if (len <= 2) {
|
|
hours = num;
|
|
num = 0;
|
|
} else {
|
|
hours = num / 100;
|
|
num %= 100;
|
|
}
|
|
} else {
|
|
if (len != 2) {
|
|
return null;
|
|
}
|
|
}
|
|
if (hours > 23 || num > 59) {
|
|
return null;
|
|
}
|
|
int gmtOffset = (hours * 60 + num) * 60 * 1000;
|
|
|
|
if (gmtOffset == 0) {
|
|
zi = ZoneInfoFile.getZoneInfo(GMT_ID);
|
|
if (negative) {
|
|
zi.setID("GMT-00:00");
|
|
} else {
|
|
zi.setID("GMT+00:00");
|
|
}
|
|
} else {
|
|
zi = ZoneInfoFile.getCustomTimeZone(id, negative ? -gmtOffset : gmtOffset);
|
|
}
|
|
return zi;
|
|
}
|
|
}
|