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/*
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* Copyright 2000-2005 Sun Microsystems, Inc. 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. Sun designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*/
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package sun.util.calendar;
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import java.io.IOException;
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import java.io.ObjectInputStream;
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import java.lang.ref.SoftReference;
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import java.util.ArrayList;
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import java.util.Date;
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import java.util.HashMap;
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import java.util.List;
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import java.util.Map;
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import java.util.SimpleTimeZone;
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import java.util.TimeZone;
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/**
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* <code>ZoneInfo</code> is an implementation subclass of {@link
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* java.util.TimeZone TimeZone} that represents GMT offsets and
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* daylight saving time transitions of a time zone.
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* <p>
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* The daylight saving time transitions are described in the {@link
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* #transitions transitions} table consisting of a chronological
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* sequence of transitions of GMT offset and/or daylight saving time
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* changes. Since all transitions are represented in UTC, in theory,
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* <code>ZoneInfo</code> can be used with any calendar systems except
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* for the {@link #getOffset(int,int,int,int,int,int) getOffset}
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* method that takes Gregorian calendar date fields.
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* <p>
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* This table covers transitions from 1900 until 2037 (as of version
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* 1.4), Before 1900, it assumes that there was no daylight saving
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* time and the <code>getOffset</code> methods always return the
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* {@link #getRawOffset} value. No Local Mean Time is supported. If a
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* specified date is beyond the transition table and this time zone is
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* supposed to observe daylight saving time in 2037, it delegates
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* operations to a {@link java.util.SimpleTimeZone SimpleTimeZone}
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* object created using the daylight saving time schedule as of 2037.
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* <p>
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* The date items, transitions, GMT offset(s), etc. are read from a database
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* file. See {@link ZoneInfoFile} for details.
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* @see java.util.SimpleTimeZone
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* @since 1.4
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*/
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public class ZoneInfo extends TimeZone {
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private static final int UTC_TIME = 0;
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private static final int STANDARD_TIME = 1;
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private static final int WALL_TIME = 2;
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private static final long OFFSET_MASK = 0x0fL;
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private static final long DST_MASK = 0xf0L;
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private static final int DST_NSHIFT = 4;
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// this bit field is reserved for abbreviation support
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private static final long ABBR_MASK = 0xf00L;
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private static final int TRANSITION_NSHIFT = 12;
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private static final CalendarSystem gcal = CalendarSystem.getGregorianCalendar();
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/**
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* The raw GMT offset in milliseconds between this zone and GMT.
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* Negative offsets are to the west of Greenwich. To obtain local
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* <em>standard</em> time, add the offset to GMT time.
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* @serial
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*/
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private int rawOffset;
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/**
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* Difference in milliseconds from the original GMT offset in case
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* the raw offset value has been modified by calling {@link
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* #setRawOffset}. The initial value is 0.
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* @serial
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*/
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private int rawOffsetDiff = 0;
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/**
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* A CRC32 value of all pairs of transition time (in milliseconds
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* in <code>long</code>) in local time and its GMT offset (in
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* seconds in <code>int</code>) in the chronological order. Byte
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* values of each <code>long</code> and <code>int</code> are taken
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* in the big endian order (i.e., MSB to LSB).
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* @serial
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*/
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private int checksum;
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/**
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* The amount of time in milliseconds saved during daylight saving
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* time. If <code>useDaylight</code> is false, this value is 0.
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* @serial
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*/
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private int dstSavings;
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/**
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* This array describes transitions of GMT offsets of this time
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* zone, including both raw offset changes and daylight saving
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* time changes.
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* A long integer consists of four bit fields.
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* <ul>
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* <li>The most significant 52-bit field represents transition
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* time in milliseconds from Gregorian January 1 1970, 00:00:00
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* GMT.</li>
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* <li>The next 4-bit field is reserved and must be 0.</li>
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* <li>The next 4-bit field is an index value to {@link #offsets
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* offsets[]} for the amount of daylight saving at the
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* transition. If this value is zero, it means that no daylight
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* saving, not the index value zero.</li>
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* <li>The least significant 4-bit field is an index value to
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* {@link #offsets offsets[]} for <em>total</em> GMT offset at the
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* transition.</li>
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* </ul>
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* If this time zone doesn't observe daylight saving time and has
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* never changed any GMT offsets in the past, this value is null.
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* @serial
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*/
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private long[] transitions;
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/**
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* This array holds all unique offset values in
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* milliseconds. Index values to this array are stored in the
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* transitions array elements.
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* @serial
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*/
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private int[] offsets;
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/**
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* SimpleTimeZone parameter values. It has to have either 8 for
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* {@link java.util.SimpleTimeZone#SimpleTimeZone(int, String,
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* int, int , int , int , int , int , int , int , int) the
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* 11-argument SimpleTimeZone constructor} or 10 for {@link
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* java.util.SimpleTimeZone#SimpleTimeZone(int, String, int, int,
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* int , int , int , int , int , int , int, int, int) the
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* 13-argument SimpleTimeZone constructor} parameters.
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* @serial
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*/
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private int[] simpleTimeZoneParams;
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/**
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* True if the raw GMT offset value would change after the time
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* zone data has been generated; false, otherwise. The default
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* value is false.
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* @serial
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*/
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private boolean willGMTOffsetChange = false;
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/**
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* True if the object has been modified after its instantiation.
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*/
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transient private boolean dirty = false;
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private static final long serialVersionUID = 2653134537216586139L;
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/**
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* A constructor.
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*/
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public ZoneInfo() {
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}
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/**
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* A Constructor for CustomID.
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*/
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public ZoneInfo(String ID, int rawOffset) {
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this(ID, rawOffset, 0, 0, null, null, null, false);
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}
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/**
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* Constructs a ZoneInfo instance.
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*
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* @param ID time zone name
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* @param rawOffset GMT offset in milliseconds
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* @param dstSavings daylight saving value in milliseconds or 0
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* (zero) if this time zone doesn't observe Daylight Saving Time.
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* @param checksum CRC32 value with all transitions table entry
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* values
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* @param transitions transition table
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* @param offsets offset value table
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* @param simpleTimeZoneParams parameter values for constructing
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* SimpleTimeZone
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* @param willGMTOffsetChange the value of willGMTOffsetChange
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*/
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ZoneInfo(String ID,
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int rawOffset,
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int dstSavings,
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int checksum,
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long[] transitions,
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int[] offsets,
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int[] simpleTimeZoneParams,
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boolean willGMTOffsetChange) {
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setID(ID);
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this.rawOffset = rawOffset;
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this.dstSavings = dstSavings;
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this.checksum = checksum;
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this.transitions = transitions;
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this.offsets = offsets;
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this.simpleTimeZoneParams = simpleTimeZoneParams;
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this.willGMTOffsetChange = willGMTOffsetChange;
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}
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/**
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* Returns the difference in milliseconds between local time and UTC
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* of given time, taking into account both the raw offset and the
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* effect of daylight savings.
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*
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* @param date the milliseconds in UTC
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* @return the milliseconds to add to UTC to get local wall time
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*/
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public int getOffset(long date) {
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return getOffsets(date, null, UTC_TIME);
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}
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public int getOffsets(long utc, int[] offsets) {
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return getOffsets(utc, offsets, UTC_TIME);
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}
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public int getOffsetsByStandard(long standard, int[] offsets) {
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return getOffsets(standard, offsets, STANDARD_TIME);
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}
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public int getOffsetsByWall(long wall, int[] offsets) {
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return getOffsets(wall, offsets, WALL_TIME);
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}
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private int getOffsets(long date, int[] offsets, int type) {
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// if dst is never observed, there is no transition.
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if (transitions == null) {
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int offset = getLastRawOffset();
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if (offsets != null) {
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offsets[0] = offset;
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offsets[1] = 0;
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}
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return offset;
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}
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date -= rawOffsetDiff;
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int index = getTransitionIndex(date, type);
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// prior to the transition table, returns the raw offset.
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// should support LMT.
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if (index < 0) {
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int offset = getLastRawOffset();
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if (offsets != null) {
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offsets[0] = offset;
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offsets[1] = 0;
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}
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return offset;
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}
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if (index < transitions.length) {
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long val = transitions[index];
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int offset = this.offsets[(int)(val & OFFSET_MASK)] + rawOffsetDiff;
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if (offsets != null) {
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int dst = (int)((val >>> DST_NSHIFT) & 0xfL);
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int save = (dst == 0) ? 0 : this.offsets[dst];
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offsets[0] = offset - save;
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offsets[1] = save;
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}
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return offset;
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}
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// beyond the transitions, delegate to SimpleTimeZone if there
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// is a rule; otherwise, return rawOffset.
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SimpleTimeZone tz = getLastRule();
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if (tz != null) {
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int rawoffset = tz.getRawOffset();
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long msec = date;
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if (type != UTC_TIME) {
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msec -= rawOffset;
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}
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int dstoffset = tz.inDaylightTime(new Date(msec)) ? tz.getDSTSavings() : 0;
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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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int offset = getLastRawOffset();
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if (offsets != null) {
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offsets[0] = offset;
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offsets[1] = 0;
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}
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return offset;
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}
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private final int getTransitionIndex(long date, int type) {
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int low = 0;
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int high = transitions.length - 1;
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while (low <= high) {
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int mid = (low + high) / 2;
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long val = transitions[mid];
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long midVal = val >> TRANSITION_NSHIFT; // sign extended
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if (type != UTC_TIME) {
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midVal += offsets[(int)(val & OFFSET_MASK)]; // wall time
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}
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if (type == STANDARD_TIME) {
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int dstIndex = (int)((val >>> DST_NSHIFT) & 0xfL);
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if (dstIndex != 0) {
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midVal -= offsets[dstIndex]; // make it standard time
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}
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}
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if (midVal < date) {
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low = mid + 1;
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} else if (midVal > date) {
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high = mid - 1;
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} else {
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return mid;
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}
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}
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// if beyond the transitions, returns that index.
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if (low >= transitions.length) {
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return low;
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}
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return low - 1;
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}
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/**
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* Returns the difference in milliseconds between local time and
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* UTC, taking into account both the raw offset and the effect of
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* daylight savings, for the specified date and time. This method
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* assumes that the start and end month are distinct. This method
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* assumes a Gregorian calendar for calculations.
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* <p>
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* <em>Note: In general, clients should use
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* {@link Calendar#ZONE_OFFSET Calendar.get(ZONE_OFFSET)} +
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* {@link Calendar#DST_OFFSET Calendar.get(DST_OFFSET)}
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* instead of calling this method.</em>
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*
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* @param era The era of the given date. The value must be either
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* GregorianCalendar.AD or GregorianCalendar.BC.
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* @param year The year in the given date.
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* @param month The month in the given date. Month is 0-based. e.g.,
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* 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 millis The milliseconds in day in <em>standard</em> local time.
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* @return The milliseconds to add to UTC to get local time.
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*/
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public int getOffset(int era, int year, int month, int day,
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int dayOfWeek, int milliseconds) {
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if (milliseconds < 0 || milliseconds >= AbstractCalendar.DAY_IN_MILLIS) {
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throw new IllegalArgumentException();
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}
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if (era == java.util.GregorianCalendar.BC) { // BC
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year = 1 - year;
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} else if (era != java.util.GregorianCalendar.AD) {
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throw new IllegalArgumentException();
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}
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CalendarDate date = gcal.newCalendarDate(null);
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date.setDate(year, month + 1, day);
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if (gcal.validate(date) == false) {
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throw new IllegalArgumentException();
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}
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// bug-for-bug compatible argument checking
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if (dayOfWeek < java.util.GregorianCalendar.SUNDAY
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|| dayOfWeek > java.util.GregorianCalendar.SATURDAY) {
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throw new IllegalArgumentException();
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}
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if (transitions == null) {
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return getLastRawOffset();
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}
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long dateInMillis = gcal.getTime(date) + milliseconds;
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dateInMillis -= (long) rawOffset; // make it UTC
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return getOffsets(dateInMillis, null, UTC_TIME);
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}
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/**
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* Sets the base time zone offset from GMT. This operation
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* modifies all the transitions of this ZoneInfo object, including
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* historical ones, if applicable.
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*
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* @param offsetMillis the base time zone offset to GMT.
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* @see getRawOffset
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*/
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public synchronized void setRawOffset(int offsetMillis) {
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if (offsetMillis == rawOffset + rawOffsetDiff) {
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return;
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}
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rawOffsetDiff = offsetMillis - rawOffset;
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if (lastRule != null) {
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lastRule.setRawOffset(offsetMillis);
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}
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dirty = true;
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}
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/**
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|
414 |
* Returns the GMT offset of the current date. This GMT offset
|
|
415 |
* value is not modified during Daylight Saving Time.
|
|
416 |
*
|
|
417 |
* @return the GMT offset value in milliseconds to add to UTC time
|
|
418 |
* to get local standard time
|
|
419 |
*/
|
|
420 |
public int getRawOffset() {
|
|
421 |
if (!willGMTOffsetChange) {
|
|
422 |
return rawOffset + rawOffsetDiff;
|
|
423 |
}
|
|
424 |
|
|
425 |
int[] offsets = new int[2];
|
|
426 |
getOffsets(System.currentTimeMillis(), offsets, UTC_TIME);
|
|
427 |
return offsets[0];
|
|
428 |
}
|
|
429 |
|
|
430 |
public boolean isDirty() {
|
|
431 |
return dirty;
|
|
432 |
}
|
|
433 |
|
|
434 |
private int getLastRawOffset() {
|
|
435 |
return rawOffset + rawOffsetDiff;
|
|
436 |
}
|
|
437 |
|
|
438 |
/**
|
|
439 |
* Queries if this time zone uses Daylight Saving Time in the last known rule.
|
|
440 |
*/
|
|
441 |
public boolean useDaylightTime() {
|
|
442 |
return (simpleTimeZoneParams != null);
|
|
443 |
}
|
|
444 |
|
|
445 |
/**
|
|
446 |
* Queries if the specified date is in Daylight Saving Time.
|
|
447 |
*/
|
|
448 |
public boolean inDaylightTime(Date date) {
|
|
449 |
if (date == null) {
|
|
450 |
throw new NullPointerException();
|
|
451 |
}
|
|
452 |
|
|
453 |
if (transitions == null) {
|
|
454 |
return false;
|
|
455 |
}
|
|
456 |
|
|
457 |
long utc = date.getTime() - rawOffsetDiff;
|
|
458 |
int index = getTransitionIndex(utc, UTC_TIME);
|
|
459 |
|
|
460 |
// before transitions in the transition table
|
|
461 |
if (index < 0) {
|
|
462 |
return false;
|
|
463 |
}
|
|
464 |
|
|
465 |
// the time is in the table range.
|
|
466 |
if (index < transitions.length) {
|
|
467 |
return (transitions[index] & DST_MASK) != 0;
|
|
468 |
}
|
|
469 |
|
|
470 |
// beyond the transition table
|
|
471 |
SimpleTimeZone tz = getLastRule();
|
|
472 |
if (tz != null) {
|
|
473 |
return tz.inDaylightTime(date);
|
|
474 |
}
|
|
475 |
return false;
|
|
476 |
}
|
|
477 |
|
|
478 |
/**
|
|
479 |
* Returns the amount of time in milliseconds that the clock is advanced
|
|
480 |
* during daylight saving time is in effect in its last daylight saving time rule.
|
|
481 |
*
|
|
482 |
* @return the number of milliseconds the time is advanced with respect to
|
|
483 |
* standard time when daylight saving time is in effect.
|
|
484 |
*/
|
|
485 |
public int getDSTSavings() {
|
|
486 |
return dstSavings;
|
|
487 |
}
|
|
488 |
|
|
489 |
// /**
|
|
490 |
// * @return the last year in the transition table or -1 if this
|
|
491 |
// * time zone doesn't observe any daylight saving time.
|
|
492 |
// */
|
|
493 |
// public int getMaxTransitionYear() {
|
|
494 |
// if (transitions == null) {
|
|
495 |
// return -1;
|
|
496 |
// }
|
|
497 |
// long val = transitions[transitions.length - 1];
|
|
498 |
// int offset = this.offsets[(int)(val & OFFSET_MASK)] + rawOffsetDiff;
|
|
499 |
// val = (val >> TRANSITION_NSHIFT) + offset;
|
|
500 |
// CalendarDate lastDate = Gregorian.getCalendarDate(val);
|
|
501 |
// return lastDate.getYear();
|
|
502 |
// }
|
|
503 |
|
|
504 |
/**
|
|
505 |
* Returns a string representation of this time zone.
|
|
506 |
* @return the string
|
|
507 |
*/
|
|
508 |
public String toString() {
|
|
509 |
return getClass().getName() +
|
|
510 |
"[id=\"" + getID() + "\"" +
|
|
511 |
",offset=" + getLastRawOffset() +
|
|
512 |
",dstSavings=" + dstSavings +
|
|
513 |
",useDaylight=" + useDaylightTime() +
|
|
514 |
",transitions=" + ((transitions != null) ? transitions.length : 0) +
|
|
515 |
",lastRule=" + (lastRule == null ? getLastRuleInstance() : lastRule) +
|
|
516 |
"]";
|
|
517 |
}
|
|
518 |
|
|
519 |
/**
|
|
520 |
* Gets all available IDs supported in the Java run-time.
|
|
521 |
*
|
|
522 |
* @return an array of time zone IDs.
|
|
523 |
*/
|
|
524 |
public static String[] getAvailableIDs() {
|
|
525 |
List<String> idList = ZoneInfoFile.getZoneIDs();
|
|
526 |
List<String> excluded = ZoneInfoFile.getExcludedZones();
|
|
527 |
if (excluded != null) {
|
|
528 |
// List all zones from the idList and excluded lists
|
|
529 |
List<String> list = new ArrayList<String>(idList.size() + excluded.size());
|
|
530 |
list.addAll(idList);
|
|
531 |
list.addAll(excluded);
|
|
532 |
idList = list;
|
|
533 |
}
|
|
534 |
String[] ids = new String[idList.size()];
|
|
535 |
return idList.toArray(ids);
|
|
536 |
}
|
|
537 |
|
|
538 |
/**
|
|
539 |
* Gets all available IDs that have the same value as the
|
|
540 |
* specified raw GMT offset.
|
|
541 |
*
|
|
542 |
* @param rawOffset the GMT offset in milliseconds. This
|
|
543 |
* value should not include any daylight saving time.
|
|
544 |
*
|
|
545 |
* @return an array of time zone IDs.
|
|
546 |
*/
|
|
547 |
public static String[] getAvailableIDs(int rawOffset) {
|
|
548 |
String[] result;
|
|
549 |
List<String> matched = new ArrayList<String>();
|
|
550 |
List<String> IDs = ZoneInfoFile.getZoneIDs();
|
|
551 |
int[] rawOffsets = ZoneInfoFile.getRawOffsets();
|
|
552 |
|
|
553 |
loop:
|
|
554 |
for (int index = 0; index < rawOffsets.length; index++) {
|
|
555 |
if (rawOffsets[index] == rawOffset) {
|
|
556 |
byte[] indices = ZoneInfoFile.getRawOffsetIndices();
|
|
557 |
for (int i = 0; i < indices.length; i++) {
|
|
558 |
if (indices[i] == index) {
|
|
559 |
matched.add(IDs.get(i++));
|
|
560 |
while (i < indices.length && indices[i] == index) {
|
|
561 |
matched.add(IDs.get(i++));
|
|
562 |
}
|
|
563 |
break loop;
|
|
564 |
}
|
|
565 |
}
|
|
566 |
}
|
|
567 |
}
|
|
568 |
|
|
569 |
// We need to add any zones from the excluded zone list that
|
|
570 |
// currently have the same GMT offset as the specified
|
|
571 |
// rawOffset. The zones returned by this method may not be
|
|
572 |
// correct as of return to the caller if any GMT offset
|
|
573 |
// transition is happening during this GMT offset checking...
|
|
574 |
List<String> excluded = ZoneInfoFile.getExcludedZones();
|
|
575 |
if (excluded != null) {
|
|
576 |
for (String id : excluded) {
|
|
577 |
TimeZone zi = getTimeZone(id);
|
|
578 |
if (zi != null && zi.getRawOffset() == rawOffset) {
|
|
579 |
matched.add(id);
|
|
580 |
}
|
|
581 |
}
|
|
582 |
}
|
|
583 |
|
|
584 |
result = new String[matched.size()];
|
|
585 |
matched.toArray(result);
|
|
586 |
return result;
|
|
587 |
}
|
|
588 |
|
|
589 |
/**
|
|
590 |
* Gets the ZoneInfo for the given ID.
|
|
591 |
*
|
|
592 |
* @param ID the ID for a ZoneInfo. See TimeZone for detail.
|
|
593 |
*
|
|
594 |
* @return the specified ZoneInfo object, or null if there is no
|
|
595 |
* time zone of the ID.
|
|
596 |
*/
|
|
597 |
public static TimeZone getTimeZone(String ID) {
|
|
598 |
ZoneInfo zi = null;
|
|
599 |
|
|
600 |
zi = ZoneInfoFile.getZoneInfo(ID);
|
|
601 |
if (zi == null) {
|
|
602 |
// if we can't create an object for the ID, try aliases.
|
|
603 |
try {
|
|
604 |
Map<String, String> map = getAliasTable();
|
|
605 |
String alias = ID;
|
|
606 |
while ((alias = map.get(alias)) != null) {
|
|
607 |
zi = ZoneInfoFile.getZoneInfo(alias);
|
|
608 |
if (zi != null) {
|
|
609 |
zi.setID(ID);
|
|
610 |
zi = ZoneInfoFile.addToCache(ID, zi);
|
|
611 |
zi = (ZoneInfo) zi.clone();
|
|
612 |
break;
|
|
613 |
}
|
|
614 |
}
|
|
615 |
} catch (Exception e) {
|
|
616 |
// ignore exceptions
|
|
617 |
}
|
|
618 |
}
|
|
619 |
return zi;
|
|
620 |
}
|
|
621 |
|
|
622 |
private transient SimpleTimeZone lastRule;
|
|
623 |
|
|
624 |
/**
|
|
625 |
* Returns a SimpleTimeZone object representing the last GMT
|
|
626 |
* offset and DST schedule or null if this time zone doesn't
|
|
627 |
* observe DST.
|
|
628 |
*/
|
|
629 |
private synchronized SimpleTimeZone getLastRule() {
|
|
630 |
if (lastRule == null) {
|
|
631 |
lastRule = getLastRuleInstance();
|
|
632 |
}
|
|
633 |
return lastRule;
|
|
634 |
}
|
|
635 |
|
|
636 |
/**
|
|
637 |
* Returns a SimpleTimeZone object that represents the last
|
|
638 |
* known daylight saving time rules.
|
|
639 |
*
|
|
640 |
* @return a SimpleTimeZone object or null if this time zone
|
|
641 |
* doesn't observe DST.
|
|
642 |
*/
|
|
643 |
public SimpleTimeZone getLastRuleInstance() {
|
|
644 |
if (simpleTimeZoneParams == null) {
|
|
645 |
return null;
|
|
646 |
}
|
|
647 |
if (simpleTimeZoneParams.length == 10) {
|
|
648 |
return new SimpleTimeZone(getLastRawOffset(), getID(),
|
|
649 |
simpleTimeZoneParams[0],
|
|
650 |
simpleTimeZoneParams[1],
|
|
651 |
simpleTimeZoneParams[2],
|
|
652 |
simpleTimeZoneParams[3],
|
|
653 |
simpleTimeZoneParams[4],
|
|
654 |
simpleTimeZoneParams[5],
|
|
655 |
simpleTimeZoneParams[6],
|
|
656 |
simpleTimeZoneParams[7],
|
|
657 |
simpleTimeZoneParams[8],
|
|
658 |
simpleTimeZoneParams[9],
|
|
659 |
dstSavings);
|
|
660 |
}
|
|
661 |
return new SimpleTimeZone(getLastRawOffset(), getID(),
|
|
662 |
simpleTimeZoneParams[0],
|
|
663 |
simpleTimeZoneParams[1],
|
|
664 |
simpleTimeZoneParams[2],
|
|
665 |
simpleTimeZoneParams[3],
|
|
666 |
simpleTimeZoneParams[4],
|
|
667 |
simpleTimeZoneParams[5],
|
|
668 |
simpleTimeZoneParams[6],
|
|
669 |
simpleTimeZoneParams[7],
|
|
670 |
dstSavings);
|
|
671 |
}
|
|
672 |
|
|
673 |
/**
|
|
674 |
* Returns a copy of this <code>ZoneInfo</code>.
|
|
675 |
*/
|
|
676 |
public Object clone() {
|
|
677 |
ZoneInfo zi = (ZoneInfo) super.clone();
|
|
678 |
zi.lastRule = null;
|
|
679 |
return zi;
|
|
680 |
}
|
|
681 |
|
|
682 |
/**
|
|
683 |
* Returns a hash code value calculated from the GMT offset and
|
|
684 |
* transitions.
|
|
685 |
* @return a hash code of this time zone
|
|
686 |
*/
|
|
687 |
public int hashCode() {
|
|
688 |
return getLastRawOffset() ^ checksum;
|
|
689 |
}
|
|
690 |
|
|
691 |
/**
|
|
692 |
* Compares the equity of two ZoneInfo objects.
|
|
693 |
*
|
|
694 |
* @param obj the object to be compared with
|
|
695 |
* @return true if given object is same as this ZoneInfo object,
|
|
696 |
* false otherwise.
|
|
697 |
*/
|
|
698 |
public boolean equals(Object obj) {
|
|
699 |
if (this == obj) {
|
|
700 |
return true;
|
|
701 |
}
|
|
702 |
if (!(obj instanceof ZoneInfo)) {
|
|
703 |
return false;
|
|
704 |
}
|
|
705 |
ZoneInfo that = (ZoneInfo) obj;
|
|
706 |
return (getID().equals(that.getID())
|
|
707 |
&& (getLastRawOffset() == that.getLastRawOffset())
|
|
708 |
&& (checksum == that.checksum));
|
|
709 |
}
|
|
710 |
|
|
711 |
/**
|
|
712 |
* Returns true if this zone has the same raw GMT offset value and
|
|
713 |
* transition table as another zone info. If the specified
|
|
714 |
* TimeZone object is not a ZoneInfo instance, this method returns
|
|
715 |
* true if the specified TimeZone object has the same raw GMT
|
|
716 |
* offset value with no daylight saving time.
|
|
717 |
*
|
|
718 |
* @param other the ZoneInfo object to be compared with
|
|
719 |
* @return true if the given <code>TimeZone</code> has the same
|
|
720 |
* GMT offset and transition information; false, otherwise.
|
|
721 |
*/
|
|
722 |
public boolean hasSameRules(TimeZone other) {
|
|
723 |
if (this == other) {
|
|
724 |
return true;
|
|
725 |
}
|
|
726 |
if (other == null) {
|
|
727 |
return false;
|
|
728 |
}
|
|
729 |
if (!(other instanceof ZoneInfo)) {
|
|
730 |
if (getRawOffset() != other.getRawOffset()) {
|
|
731 |
return false;
|
|
732 |
}
|
|
733 |
// if both have the same raw offset and neither observes
|
|
734 |
// DST, they have the same rule.
|
|
735 |
if ((transitions == null)
|
|
736 |
&& (useDaylightTime() == false)
|
|
737 |
&& (other.useDaylightTime() == false)) {
|
|
738 |
return true;
|
|
739 |
}
|
|
740 |
return false;
|
|
741 |
}
|
|
742 |
if (getLastRawOffset() != ((ZoneInfo)other).getLastRawOffset()) {
|
|
743 |
return false;
|
|
744 |
}
|
|
745 |
return (checksum == ((ZoneInfo)other).checksum);
|
|
746 |
}
|
|
747 |
|
|
748 |
private static SoftReference<Map> aliasTable;
|
|
749 |
|
|
750 |
/**
|
|
751 |
* Returns a Map from alias time zone IDs to their standard
|
|
752 |
* time zone IDs.
|
|
753 |
*
|
|
754 |
* @return the Map that holds the mappings from alias time zone IDs
|
|
755 |
* to their standard time zone IDs, or null if
|
|
756 |
* <code>ZoneInfoMappings</code> file is not available.
|
|
757 |
*/
|
|
758 |
public synchronized static Map<String, String> getAliasTable() {
|
|
759 |
Map<String, String> aliases = null;
|
|
760 |
|
|
761 |
SoftReference<Map> cache = aliasTable;
|
|
762 |
if (cache != null) {
|
|
763 |
aliases = cache.get();
|
|
764 |
if (aliases != null) {
|
|
765 |
return aliases;
|
|
766 |
}
|
|
767 |
}
|
|
768 |
|
|
769 |
aliases = ZoneInfoFile.getZoneAliases();
|
|
770 |
if (aliases != null) {
|
|
771 |
aliasTable = new SoftReference<Map>(aliases);
|
|
772 |
}
|
|
773 |
return aliases;
|
|
774 |
}
|
|
775 |
|
|
776 |
private void readObject(ObjectInputStream stream)
|
|
777 |
throws IOException, ClassNotFoundException {
|
|
778 |
stream.defaultReadObject();
|
|
779 |
// We don't know how this object from 1.4.x or earlier has
|
|
780 |
// been mutated. So it should always be marked as `dirty'.
|
|
781 |
dirty = true;
|
|
782 |
}
|
|
783 |
}
|