--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/src/share/classes/java/util/TimeZone.java Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,791 @@
+/*
+ * Copyright 1996-2005 Sun Microsystems, Inc. All Rights Reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation. Sun designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Sun in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ */
+
+/*
+ * (C) Copyright Taligent, Inc. 1996 - All Rights Reserved
+ * (C) Copyright IBM Corp. 1996 - All Rights Reserved
+ *
+ * The original version of this source code and documentation is copyrighted
+ * and owned by Taligent, Inc., a wholly-owned subsidiary of IBM. These
+ * materials are provided under terms of a License Agreement between Taligent
+ * and Sun. This technology is protected by multiple US and International
+ * patents. This notice and attribution to Taligent may not be removed.
+ * Taligent is a registered trademark of Taligent, Inc.
+ *
+ */
+
+package java.util;
+
+import java.io.Serializable;
+import java.lang.ref.SoftReference;
+import java.security.AccessController;
+import java.security.PrivilegedAction;
+import java.util.concurrent.ConcurrentHashMap;
+import sun.security.action.GetPropertyAction;
+import sun.util.TimeZoneNameUtility;
+import sun.util.calendar.ZoneInfo;
+import sun.util.calendar.ZoneInfoFile;
+
+/**
+ * <code>TimeZone</code> represents a time zone offset, and also figures out daylight
+ * savings.
+ *
+ * <p>
+ * Typically, you get a <code>TimeZone</code> using <code>getDefault</code>
+ * which creates a <code>TimeZone</code> based on the time zone where the program
+ * is running. For example, for a program running in Japan, <code>getDefault</code>
+ * creates a <code>TimeZone</code> object based on Japanese Standard Time.
+ *
+ * <p>
+ * You can also get a <code>TimeZone</code> using <code>getTimeZone</code>
+ * along with a time zone ID. For instance, the time zone ID for the
+ * U.S. Pacific Time zone is "America/Los_Angeles". So, you can get a
+ * U.S. Pacific Time <code>TimeZone</code> object with:
+ * <blockquote><pre>
+ * TimeZone tz = TimeZone.getTimeZone("America/Los_Angeles");
+ * </pre></blockquote>
+ * You can use the <code>getAvailableIDs</code> method to iterate through
+ * all the supported time zone IDs. You can then choose a
+ * supported ID to get a <code>TimeZone</code>.
+ * If the time zone you want is not represented by one of the
+ * supported IDs, then a custom time zone ID can be specified to
+ * produce a TimeZone. The syntax of a custom time zone ID is:
+ *
+ * <blockquote><pre>
+ * <a name="CustomID"><i>CustomID:</i></a>
+ * <code>GMT</code> <i>Sign</i> <i>Hours</i> <code>:</code> <i>Minutes</i>
+ * <code>GMT</code> <i>Sign</i> <i>Hours</i> <i>Minutes</i>
+ * <code>GMT</code> <i>Sign</i> <i>Hours</i>
+ * <i>Sign:</i> one of
+ * <code>+ -</code>
+ * <i>Hours:</i>
+ * <i>Digit</i>
+ * <i>Digit</i> <i>Digit</i>
+ * <i>Minutes:</i>
+ * <i>Digit</i> <i>Digit</i>
+ * <i>Digit:</i> one of
+ * <code>0 1 2 3 4 5 6 7 8 9</code>
+ * </pre></blockquote>
+ *
+ * <i>Hours</i> must be between 0 to 23 and <i>Minutes</i> must be
+ * between 00 to 59. For example, "GMT+10" and "GMT+0010" mean ten
+ * hours and ten minutes ahead of GMT, respectively.
+ * <p>
+ * The format is locale independent and digits must be taken from the
+ * Basic Latin block of the Unicode standard. No daylight saving time
+ * transition schedule can be specified with a custom time zone ID. If
+ * the specified string doesn't match the syntax, <code>"GMT"</code>
+ * is used.
+ * <p>
+ * When creating a <code>TimeZone</code>, the specified custom time
+ * zone ID is normalized in the following syntax:
+ * <blockquote><pre>
+ * <a name="NormalizedCustomID"><i>NormalizedCustomID:</i></a>
+ * <code>GMT</code> <i>Sign</i> <i>TwoDigitHours</i> <code>:</code> <i>Minutes</i>
+ * <i>Sign:</i> one of
+ * <code>+ -</code>
+ * <i>TwoDigitHours:</i>
+ * <i>Digit</i> <i>Digit</i>
+ * <i>Minutes:</i>
+ * <i>Digit</i> <i>Digit</i>
+ * <i>Digit:</i> one of
+ * <code>0 1 2 3 4 5 6 7 8 9</code>
+ * </pre></blockquote>
+ * For example, TimeZone.getTimeZone("GMT-8").getID() returns "GMT-08:00".
+ *
+ * <h4>Three-letter time zone IDs</h4>
+ *
+ * For compatibility with JDK 1.1.x, some other three-letter time zone IDs
+ * (such as "PST", "CTT", "AST") are also supported. However, <strong>their
+ * use is deprecated</strong> because the same abbreviation is often used
+ * for multiple time zones (for example, "CST" could be U.S. "Central Standard
+ * Time" and "China Standard Time"), and the Java platform can then only
+ * recognize one of them.
+ *
+ *
+ * @see Calendar
+ * @see GregorianCalendar
+ * @see SimpleTimeZone
+ * @author Mark Davis, David Goldsmith, Chen-Lieh Huang, Alan Liu
+ * @since JDK1.1
+ */
+abstract public class TimeZone implements Serializable, Cloneable {
+ /**
+ * Sole constructor. (For invocation by subclass constructors, typically
+ * implicit.)
+ */
+ public TimeZone() {
+ }
+
+ /**
+ * A style specifier for <code>getDisplayName()</code> indicating
+ * a short name, such as "PST."
+ * @see #LONG
+ * @since 1.2
+ */
+ public static final int SHORT = 0;
+
+ /**
+ * A style specifier for <code>getDisplayName()</code> indicating
+ * a long name, such as "Pacific Standard Time."
+ * @see #SHORT
+ * @since 1.2
+ */
+ public static final int LONG = 1;
+
+ // Constants used internally; unit is milliseconds
+ private static final int ONE_MINUTE = 60*1000;
+ private static final int ONE_HOUR = 60*ONE_MINUTE;
+ private static final int ONE_DAY = 24*ONE_HOUR;
+
+ /**
+ * Cache to hold the SimpleDateFormat objects for a Locale.
+ */
+ private static Hashtable cachedLocaleData = new Hashtable(3);
+
+ // Proclaim serialization compatibility with JDK 1.1
+ static final long serialVersionUID = 3581463369166924961L;
+
+ /**
+ * Gets the time zone offset, for current date, modified in case of
+ * daylight savings. This is the offset to add to UTC to get local time.
+ * <p>
+ * This method returns a historically correct offset if an
+ * underlying <code>TimeZone</code> implementation subclass
+ * supports historical Daylight Saving Time schedule and GMT
+ * offset changes.
+ *
+ * @param era the era of the given date.
+ * @param year the year in the given date.
+ * @param month the month in the given date.
+ * Month is 0-based. e.g., 0 for January.
+ * @param day the day-in-month of the given date.
+ * @param dayOfWeek the day-of-week of the given date.
+ * @param milliseconds the milliseconds in day in <em>standard</em>
+ * local time.
+ *
+ * @return the offset in milliseconds to add to GMT to get local time.
+ *
+ * @see Calendar#ZONE_OFFSET
+ * @see Calendar#DST_OFFSET
+ */
+ public abstract int getOffset(int era, int year, int month, int day,
+ int dayOfWeek, int milliseconds);
+
+ /**
+ * Returns the offset of this time zone from UTC at the specified
+ * date. If Daylight Saving Time is in effect at the specified
+ * date, the offset value is adjusted with the amount of daylight
+ * saving.
+ * <p>
+ * This method returns a historically correct offset value if an
+ * underlying TimeZone implementation subclass supports historical
+ * Daylight Saving Time schedule and GMT offset changes.
+ *
+ * @param date the date represented in milliseconds since January 1, 1970 00:00:00 GMT
+ * @return the amount of time in milliseconds to add to UTC to get local time.
+ *
+ * @see Calendar#ZONE_OFFSET
+ * @see Calendar#DST_OFFSET
+ * @since 1.4
+ */
+ public int getOffset(long date) {
+ if (inDaylightTime(new Date(date))) {
+ return getRawOffset() + getDSTSavings();
+ }
+ return getRawOffset();
+ }
+
+ /**
+ * Gets the raw GMT offset and the amount of daylight saving of this
+ * time zone at the given time.
+ * @param date the milliseconds (since January 1, 1970,
+ * 00:00:00.000 GMT) at which the time zone offset and daylight
+ * saving amount are found
+ * @param offset an array of int where the raw GMT offset
+ * (offset[0]) and daylight saving amount (offset[1]) are stored,
+ * or null if those values are not needed. The method assumes that
+ * the length of the given array is two or larger.
+ * @return the total amount of the raw GMT offset and daylight
+ * saving at the specified date.
+ *
+ * @see Calendar#ZONE_OFFSET
+ * @see Calendar#DST_OFFSET
+ */
+ int getOffsets(long date, int[] offsets) {
+ int rawoffset = getRawOffset();
+ int dstoffset = 0;
+ if (inDaylightTime(new Date(date))) {
+ dstoffset = getDSTSavings();
+ }
+ if (offsets != null) {
+ offsets[0] = rawoffset;
+ offsets[1] = dstoffset;
+ }
+ return rawoffset + dstoffset;
+ }
+
+ /**
+ * Sets the base time zone offset to GMT.
+ * This is the offset to add to UTC to get local time.
+ * <p>
+ * If an underlying <code>TimeZone</code> implementation subclass
+ * supports historical GMT offset changes, the specified GMT
+ * offset is set as the latest GMT offset and the difference from
+ * the known latest GMT offset value is used to adjust all
+ * historical GMT offset values.
+ *
+ * @param offsetMillis the given base time zone offset to GMT.
+ */
+ abstract public void setRawOffset(int offsetMillis);
+
+ /**
+ * Returns the amount of time in milliseconds to add to UTC to get
+ * standard time in this time zone. Because this value is not
+ * affected by daylight saving time, it is called <I>raw
+ * offset</I>.
+ * <p>
+ * If an underlying <code>TimeZone</code> implementation subclass
+ * supports historical GMT offset changes, the method returns the
+ * raw offset value of the current date. In Honolulu, for example,
+ * its raw offset changed from GMT-10:30 to GMT-10:00 in 1947, and
+ * this method always returns -36000000 milliseconds (i.e., -10
+ * hours).
+ *
+ * @return the amount of raw offset time in milliseconds to add to UTC.
+ * @see Calendar#ZONE_OFFSET
+ */
+ public abstract int getRawOffset();
+
+ /**
+ * Gets the ID of this time zone.
+ * @return the ID of this time zone.
+ */
+ public String getID()
+ {
+ return ID;
+ }
+
+ /**
+ * Sets the time zone ID. This does not change any other data in
+ * the time zone object.
+ * @param ID the new time zone ID.
+ */
+ public void setID(String ID)
+ {
+ if (ID == null) {
+ throw new NullPointerException();
+ }
+ this.ID = ID;
+ }
+
+ /**
+ * Returns a name of this time zone suitable for presentation to the user
+ * in the default locale.
+ * This method returns the long name, not including daylight savings.
+ * If the display name is not available for the locale,
+ * then this method returns a string in the
+ * <a href="#NormalizedCustomID">normalized custom ID format</a>.
+ * @return the human-readable name of this time zone in the default locale.
+ * @since 1.2
+ */
+ public final String getDisplayName() {
+ return getDisplayName(false, LONG, Locale.getDefault());
+ }
+
+ /**
+ * Returns a name of this time zone suitable for presentation to the user
+ * in the specified locale.
+ * This method returns the long name, not including daylight savings.
+ * If the display name is not available for the locale,
+ * then this method returns a string in the
+ * <a href="#NormalizedCustomID">normalized custom ID format</a>.
+ * @param locale the locale in which to supply the display name.
+ * @return the human-readable name of this time zone in the given locale.
+ * @since 1.2
+ */
+ public final String getDisplayName(Locale locale) {
+ return getDisplayName(false, LONG, locale);
+ }
+
+ /**
+ * Returns a name of this time zone suitable for presentation to the user
+ * in the default locale.
+ * If the display name is not available for the locale, then this
+ * method returns a string in the
+ * <a href="#NormalizedCustomID">normalized custom ID format</a>.
+ * @param daylight if true, return the daylight savings name.
+ * @param style either <code>LONG</code> or <code>SHORT</code>
+ * @return the human-readable name of this time zone in the default locale.
+ * @since 1.2
+ */
+ public final String getDisplayName(boolean daylight, int style) {
+ return getDisplayName(daylight, style, Locale.getDefault());
+ }
+
+ /**
+ * Returns a name of this time zone suitable for presentation to the user
+ * in the specified locale.
+ * If the display name is not available for the locale,
+ * then this method returns a string in the
+ * <a href="#NormalizedCustomID">normalized custom ID format</a>.
+ * @param daylight if true, return the daylight savings name.
+ * @param style either <code>LONG</code> or <code>SHORT</code>
+ * @param locale the locale in which to supply the display name.
+ * @return the human-readable name of this time zone in the given locale.
+ * @exception IllegalArgumentException style is invalid.
+ * @since 1.2
+ */
+ public String getDisplayName(boolean daylight, int style, Locale locale) {
+ if (style != SHORT && style != LONG) {
+ throw new IllegalArgumentException("Illegal style: " + style);
+ }
+
+ String id = getID();
+ String[] names = getDisplayNames(id, locale);
+ if (names == null) {
+ if (id.startsWith("GMT")) {
+ char sign = id.charAt(3);
+ if (sign == '+' || sign == '-') {
+ return id;
+ }
+ }
+ int offset = getRawOffset();
+ if (daylight) {
+ offset += getDSTSavings();
+ }
+ return ZoneInfoFile.toCustomID(offset);
+ }
+
+ int index = daylight ? 3 : 1;
+ if (style == SHORT) {
+ index++;
+ }
+ return names[index];
+ }
+
+ private static class DisplayNames {
+ // Cache for managing display names per timezone per locale
+ // The structure is:
+ // Map(key=id, value=SoftReference(Map(key=locale, value=displaynames)))
+ private static final Map<String, SoftReference<Map<Locale, String[]>>> CACHE =
+ new ConcurrentHashMap<String, SoftReference<Map<Locale, String[]>>>();
+ }
+
+ private static final String[] getDisplayNames(String id, Locale locale) {
+ Map<String, SoftReference<Map<Locale, String[]>>> displayNames = DisplayNames.CACHE;
+
+ SoftReference<Map<Locale, String[]>> ref = displayNames.get(id);
+ if (ref != null) {
+ Map<Locale, String[]> perLocale = ref.get();
+ if (perLocale != null) {
+ String[] names = perLocale.get(locale);
+ if (names != null) {
+ return names;
+ }
+ names = TimeZoneNameUtility.retrieveDisplayNames(id, locale);
+ if (names != null) {
+ perLocale.put(locale, names);
+ }
+ return names;
+ }
+ }
+
+ String[] names = TimeZoneNameUtility.retrieveDisplayNames(id, locale);
+ if (names != null) {
+ Map<Locale, String[]> perLocale = new ConcurrentHashMap<Locale, String[]>();
+ perLocale.put(locale, names);
+ ref = new SoftReference<Map<Locale, String[]>>(perLocale);
+ displayNames.put(id, ref);
+ }
+ return names;
+ }
+
+ /**
+ * Returns the amount of time to be added to local standard time
+ * to get local wall clock time.
+ * <p>
+ * The default implementation always returns 3600000 milliseconds
+ * (i.e., one hour) if this time zone observes Daylight Saving
+ * Time. Otherwise, 0 (zero) is returned.
+ * <p>
+ * If an underlying TimeZone implementation subclass supports
+ * historical Daylight Saving Time changes, this method returns
+ * the known latest daylight saving value.
+ *
+ * @return the amount of saving time in milliseconds
+ * @since 1.4
+ */
+ public int getDSTSavings() {
+ if (useDaylightTime()) {
+ return 3600000;
+ }
+ return 0;
+ }
+
+ /**
+ * Queries if this time zone uses daylight savings time.
+ * <p>
+ * If an underlying <code>TimeZone</code> implementation subclass
+ * supports historical Daylight Saving Time schedule changes, the
+ * method refers to the latest Daylight Saving Time schedule
+ * information.
+ *
+ * @return true if this time zone uses daylight savings time,
+ * false, otherwise.
+ */
+ public abstract boolean useDaylightTime();
+
+ /**
+ * Queries if the given date is in daylight savings time in
+ * this time zone.
+ * @param date the given Date.
+ * @return true if the given date is in daylight savings time,
+ * 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 savings 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 = defaultZoneTL.get();
+ 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;
+ defaultZoneTL.set(null);
+ }
+ } else {
+ defaultZoneTL.set(zone);
+ }
+ }
+
+ /**
+ * 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;
+ private static final InheritableThreadLocal<TimeZone> defaultZoneTL
+ = new InheritableThreadLocal<TimeZone>();
+
+ static final String GMT_ID = "GMT";
+ private static final int GMT_ID_LENGTH = 3;
+
+ /**
+ * 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;
+ }
+}