1/* GENERATED SOURCE. DO NOT MODIFY. */ 2// © 2016 and later: Unicode, Inc. and others. 3// License & terms of use: http://www.unicode.org/copyright.html#License 4/* 5 * @(#)TimeZone.java 1.51 00/01/19 6 * 7 * Copyright (C) 1996-2016, International Business Machines 8 * Corporation and others. All Rights Reserved. 9 */ 10 11package android.icu.util; 12 13import java.io.Serializable; 14import java.util.Date; 15import java.util.Locale; 16import java.util.MissingResourceException; 17import java.util.Set; 18import java.util.logging.Logger; 19 20import android.icu.impl.Grego; 21import android.icu.impl.ICUConfig; 22import android.icu.impl.ICUData; 23import android.icu.impl.ICUResourceBundle; 24import android.icu.impl.JavaTimeZone; 25import android.icu.impl.TimeZoneAdapter; 26import android.icu.impl.ZoneMeta; 27import android.icu.text.TimeZoneFormat; 28import android.icu.text.TimeZoneFormat.Style; 29import android.icu.text.TimeZoneFormat.TimeType; 30import android.icu.text.TimeZoneNames; 31import android.icu.text.TimeZoneNames.NameType; 32import android.icu.util.ULocale.Category; 33 34/** 35 * <strong>[icu enhancement]</strong> ICU's replacement for {@link java.util.TimeZone}. Methods, fields, and other functionality specific to ICU are labeled '<strong>[icu]</strong>'. 36 * 37 * <p><code>TimeZone</code> represents a time zone offset, and also computes daylight 38 * savings. 39 * 40 * <p>Typically, you get a <code>TimeZone</code> using {@link #getDefault()} 41 * which creates a <code>TimeZone</code> based on the time zone where the program 42 * is running. For example, for a program running in Japan, <code>getDefault</code> 43 * creates a <code>TimeZone</code> object based on Japanese Standard Time. 44 * 45 * <p>You can also get a <code>TimeZone</code> using {@link #getTimeZone(String)} 46 * along with a time zone ID. For instance, the time zone ID for the 47 * U.S. Pacific Time zone is "America/Los_Angeles". So, you can get a 48 * U.S. Pacific Time <code>TimeZone</code> object with: 49 * 50 * <blockquote> 51 * <pre> 52 * TimeZone tz = TimeZone.getTimeZone("America/Los_Angeles"); 53 * </pre> 54 * </blockquote> 55 * You can use the {@link #getAvailableIDs()} method to iterate through 56 * all the supported time zone IDs, or getCanonicalID method to check 57 * if a time zone ID is supported or not. You can then choose a 58 * supported ID to get a <code>TimeZone</code>. 59 * If the time zone you want is not represented by one of the 60 * supported IDs, then you can create a custom time zone ID with 61 * the following syntax: 62 * 63 * <blockquote> 64 * <pre> 65 * GMT[+|-]hh[[:]mm] 66 * </pre> 67 * </blockquote> 68 * 69 * For example, you might specify GMT+14:00 as a custom 70 * time zone ID. The <code>TimeZone</code> that is returned 71 * when you specify a custom time zone ID uses the specified 72 * offset from GMT(=UTC) and does not observe daylight saving 73 * time. For example, you might specify GMT+14:00 as a custom 74 * time zone ID to create a TimeZone representing 14 hours ahead 75 * of GMT (with no daylight saving time). In addition, 76 * <code>getCanonicalID</code> can also be used to 77 * normalize a custom time zone ID. 78 * 79 * <p>For compatibility with JDK 1.1.x, some other three-letter time zone IDs 80 * (such as "PST", "CTT", "AST") are also supported. However, <strong>their 81 * use is deprecated</strong> because the same abbreviation is often used 82 * for multiple time zones (for example, "CST" could be U.S. "Central Standard 83 * Time" and "China Standard Time"), and the Java platform can then only 84 * recognize one of them. 85 * 86 * @see Calendar 87 * @see GregorianCalendar 88 * @see SimpleTimeZone 89 * @author Mark Davis, Deborah Goldsmith, Chen-Lieh Huang, Alan Liu 90 */ 91abstract public class TimeZone implements Serializable, Cloneable, Freezable<TimeZone> { 92 /** 93 * Logger instance for this class 94 */ 95 private static final Logger LOGGER = Logger.getLogger("android.icu.util.TimeZone"); 96 97 // using serialver from jdk1.4.2_05 98 private static final long serialVersionUID = -744942128318337471L; 99 100 /** 101 * Default constructor. (For invocation by subclass constructors, 102 * typically implicit.) 103 */ 104 public TimeZone() { 105 } 106 107 /** 108 * Constructing a TimeZone with the given time zone ID. 109 * @param ID the time zone ID. 110 * @deprecated This API is ICU internal only. 111 * @hide original deprecated declaration 112 * @hide draft / provisional / internal are hidden on Android 113 */ 114 @Deprecated 115 protected TimeZone(String ID) { 116 if (ID == null) { 117 throw new NullPointerException(); 118 } 119 this.ID = ID; 120 } 121 122 /** 123 * <strong>[icu]</strong> A time zone implementation type indicating ICU's own TimeZone used by 124 * <code>getTimeZone</code>. 125 */ 126 public static final int TIMEZONE_ICU = 0; 127 /** 128 * <strong>[icu]</strong> A time zone implementation type indicating the {@link java.util.TimeZone} 129 * used by <code>getTimeZone</code>. 130 */ 131 public static final int TIMEZONE_JDK = 1; 132 133 /** 134 * A style specifier for <code>getDisplayName()</code> indicating 135 * a short name, such as "PST." 136 * @see #LONG 137 */ 138 public static final int SHORT = 0; 139 140 /** 141 * A style specifier for <code>getDisplayName()</code> indicating 142 * a long name, such as "Pacific Standard Time." 143 * @see #SHORT 144 */ 145 public static final int LONG = 1; 146 147 /** 148 * <strong>[icu]</strong> A style specifier for <code>getDisplayName()</code> indicating 149 * a short generic name, such as "PT." 150 * @see #LONG_GENERIC 151 */ 152 public static final int SHORT_GENERIC = 2; 153 154 /** 155 * <strong>[icu]</strong> A style specifier for <code>getDisplayName()</code> indicating 156 * a long generic name, such as "Pacific Time." 157 * @see #SHORT_GENERIC 158 */ 159 public static final int LONG_GENERIC = 3; 160 161 /** 162 * <strong>[icu]</strong> A style specifier for <code>getDisplayName()</code> indicating 163 * a short name derived from the timezone's offset, such as "-0800." 164 * @see #LONG_GMT 165 */ 166 public static final int SHORT_GMT = 4; 167 168 /** 169 * <strong>[icu]</strong> A style specifier for <code>getDisplayName()</code> indicating 170 * a long name derived from the timezone's offset, such as "GMT-08:00." 171 * @see #SHORT_GMT 172 */ 173 public static final int LONG_GMT = 5; 174 175 /** 176 * <strong>[icu]</strong> A style specifier for <code>getDisplayName()</code> indicating 177 * a short name derived from the timezone's short standard or daylight 178 * timezone name ignoring commonlyUsed, such as "PDT." 179 */ 180 181 public static final int SHORT_COMMONLY_USED = 6; 182 183 /** 184 * <strong>[icu]</strong> A style specifier for <code>getDisplayName()</code> indicating 185 * a long name derived from the timezone's fallback name, such as 186 * "United States (Los Angeles)." 187 */ 188 public static final int GENERIC_LOCATION = 7; 189 190 /** 191 * <strong>[icu]</strong> The time zone ID reserved for unknown time zone. 192 * @see #getTimeZone(String) 193 */ 194 public static final String UNKNOWN_ZONE_ID = "Etc/Unknown"; 195 196 /** 197 * The canonical ID for GMT(UTC) time zone. 198 */ 199 static final String GMT_ZONE_ID = "Etc/GMT"; 200 201 /** 202 * <strong>[icu]</strong> The immutable (frozen) "unknown" time zone. 203 * It behaves like the GMT/UTC time zone but has the UNKNOWN_ZONE_ID = "Etc/Unknown". 204 * {@link TimeZone#getTimeZone(String)} returns a mutable clone of this 205 * time zone if the input ID is not recognized. 206 * 207 * @see #UNKNOWN_ZONE_ID 208 * @see #getTimeZone(String) 209 */ 210 public static final TimeZone UNKNOWN_ZONE = new ConstantZone(0, UNKNOWN_ZONE_ID).freeze(); 211 212 /** 213 * <strong>[icu]</strong> The immutable GMT (=UTC) time zone. Its ID is "Etc/GMT". 214 */ 215 public static final TimeZone GMT_ZONE = new ConstantZone(0, GMT_ZONE_ID).freeze(); 216 217 /** 218 * <strong>[icu]</strong> System time zone type constants used by filtering zones in 219 * {@link TimeZone#getAvailableIDs(SystemTimeZoneType, String, Integer)} 220 */ 221 public enum SystemTimeZoneType { 222 /** 223 * Any system zones. 224 */ 225 ANY, 226 227 /** 228 * Canonical system zones. 229 */ 230 CANONICAL, 231 232 /** 233 * Canonical system zones associated with actual locations. 234 */ 235 CANONICAL_LOCATION, 236 } 237 238 /** 239 * Gets the time zone offset, for current date, modified in case of 240 * daylight savings. This is the offset to add *to* UTC to get local time. 241 * @param era the era of the given date. 242 * @param year the year in the given date. 243 * @param month the month in the given date. 244 * Month is 0-based. e.g., 0 for January. 245 * @param day the day-in-month of the given date. 246 * @param dayOfWeek the day-of-week of the given date. 247 * @param milliseconds the millis in day in <em>standard</em> local time. 248 * @return the offset to add *to* GMT to get local time. 249 */ 250 abstract public int getOffset(int era, int year, int month, int day, 251 int dayOfWeek, int milliseconds); 252 253 254 /** 255 * Returns the offset of this time zone from UTC at the specified 256 * date. If Daylight Saving Time is in effect at the specified 257 * date, the offset value is adjusted with the amount of daylight 258 * saving. 259 * 260 * @param date the date represented in milliseconds since January 1, 1970 00:00:00 GMT 261 * @return the amount of time in milliseconds to add to UTC to get local time. 262 * 263 * @see Calendar#ZONE_OFFSET 264 * @see Calendar#DST_OFFSET 265 * @see #getOffset(long, boolean, int[]) 266 */ 267 public int getOffset(long date) { 268 int[] result = new int[2]; 269 getOffset(date, false, result); 270 return result[0]+result[1]; 271 } 272 273 /** 274 * Returns the time zone raw and GMT offset for the given moment 275 * in time. Upon return, local-millis = GMT-millis + rawOffset + 276 * dstOffset. All computations are performed in the proleptic 277 * Gregorian calendar. The default implementation in the TimeZone 278 * class delegates to the 8-argument getOffset(). 279 * 280 * @param date moment in time for which to return offsets, in 281 * units of milliseconds from January 1, 1970 0:00 GMT, either GMT 282 * time or local wall time, depending on `local'. 283 * @param local if true, `date' is local wall time; otherwise it 284 * is in GMT time. 285 * @param offsets output parameter to receive the raw offset, that 286 * is, the offset not including DST adjustments, in offsets[0], 287 * and the DST offset, that is, the offset to be added to 288 * `rawOffset' to obtain the total offset between local and GMT 289 * time, in offsets[1]. If DST is not in effect, the DST offset is 290 * zero; otherwise it is a positive value, typically one hour. 291 */ 292 public void getOffset(long date, boolean local, int[] offsets) { 293 offsets[0] = getRawOffset(); 294 if (!local) { 295 date += offsets[0]; // now in local standard millis 296 } 297 298 // When local == true, date might not be in local standard 299 // millis. getOffset taking 6 parameters used here assume 300 // the given time in day is local standard time. 301 // At STD->DST transition, there is a range of time which 302 // does not exist. When 'date' is in this time range 303 // (and local == true), this method interprets the specified 304 // local time as DST. At DST->STD transition, there is a 305 // range of time which occurs twice. In this case, this 306 // method interprets the specified local time as STD. 307 // To support the behavior above, we need to call getOffset 308 // (with 6 args) twice when local == true and DST is 309 // detected in the initial call. 310 int fields[] = new int[6]; 311 for (int pass = 0; ; pass++) { 312 Grego.timeToFields(date, fields); 313 offsets[1] = getOffset(GregorianCalendar.AD, 314 fields[0], fields[1], fields[2], 315 fields[3], fields[5]) - offsets[0]; 316 317 if (pass != 0 || !local || offsets[1] == 0) { 318 break; 319 } 320 // adjust to local standard millis 321 date -= offsets[1]; 322 } 323 } 324 325 /** 326 * Sets the base time zone offset to GMT. 327 * This is the offset to add *to* UTC to get local time. 328 * @param offsetMillis the given base time zone offset to GMT. 329 */ 330 abstract public void setRawOffset(int offsetMillis); 331 332 /** 333 * Gets unmodified offset, NOT modified in case of daylight savings. 334 * This is the offset to add *to* UTC to get local time. 335 * @return the unmodified offset to add *to* UTC to get local time. 336 */ 337 abstract public int getRawOffset(); 338 339 /** 340 * Gets the ID of this time zone. 341 * @return the ID of this time zone. 342 */ 343 public String getID() { 344 return ID; 345 } 346 347 /** 348 * Sets the time zone ID. This does not change any other data in 349 * the time zone object. 350 * @param ID the new time zone ID. 351 */ 352 public void setID(String ID) { 353 if (ID == null) { 354 throw new NullPointerException(); 355 } 356 if (isFrozen()) { 357 throw new UnsupportedOperationException("Attempt to modify a frozen TimeZone instance."); 358 } 359 this.ID = ID; 360 } 361 362 /** 363 * Returns a name of this time zone suitable for presentation to the user 364 * in the default <code>DISPLAY</code> locale. 365 * This method returns the long generic name. 366 * If the display name is not available for the locale, 367 * a fallback based on the country, city, or time zone id will be used. 368 * @return the human-readable name of this time zone in the default locale. 369 * @see Category#DISPLAY 370 */ 371 public final String getDisplayName() { 372 return _getDisplayName(LONG_GENERIC, false, ULocale.getDefault(Category.DISPLAY)); 373 } 374 375 /** 376 * Returns a name of this time zone suitable for presentation to the user 377 * in the specified locale. 378 * This method returns the long generic name. 379 * If the display name is not available for the locale, 380 * a fallback based on the country, city, or time zone id will be used. 381 * @param locale the locale in which to supply the display name. 382 * @return the human-readable name of this time zone in the given locale 383 * or in the default locale if the given locale is not recognized. 384 */ 385 public final String getDisplayName(Locale locale) { 386 return _getDisplayName(LONG_GENERIC, false, ULocale.forLocale(locale)); 387 } 388 389 /** 390 * Returns a name of this time zone suitable for presentation to the user 391 * in the specified locale. 392 * This method returns the long name, not including daylight savings. 393 * If the display name is not available for the locale, 394 * a fallback based on the country, city, or time zone id will be used. 395 * @param locale the ulocale in which to supply the display name. 396 * @return the human-readable name of this time zone in the given locale 397 * or in the default ulocale if the given ulocale is not recognized. 398 */ 399 public final String getDisplayName(ULocale locale) { 400 return _getDisplayName(LONG_GENERIC, false, locale); 401 } 402 403 /** 404 * Returns a name of this time zone suitable for presentation to the user 405 * in the default <code>DISPLAY</code> locale. 406 * If the display name is not available for the locale, 407 * then this method returns a string in the localized GMT offset format 408 * such as <code>GMT[+-]HH:mm</code>. 409 * @param daylight if true, return the daylight savings name. 410 * @param style the output style of the display name. Valid styles are 411 * <code>SHORT</code>, <code>LONG</code>, <code>SHORT_GENERIC</code>, 412 * <code>LONG_GENERIC</code>, <code>SHORT_GMT</code>, <code>LONG_GMT</code>, 413 * <code>SHORT_COMMONLY_USED</code> or <code>GENERIC_LOCATION</code>. 414 * @return the human-readable name of this time zone in the default locale. 415 * @see Category#DISPLAY 416 */ 417 public final String getDisplayName(boolean daylight, int style) { 418 return getDisplayName(daylight, style, ULocale.getDefault(Category.DISPLAY)); 419 } 420 421 /** 422 * Returns a name of this time zone suitable for presentation to the user 423 * in the specified locale. 424 * If the display name is not available for the locale, 425 * then this method returns a string in the localized GMT offset format 426 * such as <code>GMT[+-]HH:mm</code>. 427 * @param daylight if true, return the daylight savings name. 428 * @param style the output style of the display name. Valid styles are 429 * <code>SHORT</code>, <code>LONG</code>, <code>SHORT_GENERIC</code>, 430 * <code>LONG_GENERIC</code>, <code>SHORT_GMT</code>, <code>LONG_GMT</code>, 431 * <code>SHORT_COMMONLY_USED</code> or <code>GENERIC_LOCATION</code>. 432 * @param locale the locale in which to supply the display name. 433 * @return the human-readable name of this time zone in the given locale 434 * or in the default locale if the given locale is not recognized. 435 * @exception IllegalArgumentException style is invalid. 436 */ 437 public String getDisplayName(boolean daylight, int style, Locale locale) { 438 return getDisplayName(daylight, style, ULocale.forLocale(locale)); 439 } 440 441 /** 442 * Returns a name of this time zone suitable for presentation to the user 443 * in the specified locale. 444 * If the display name is not available for the locale, 445 * then this method returns a string in the localized GMT offset format 446 * such as <code>GMT[+-]HH:mm</code>. 447 * @param daylight if true, return the daylight savings name. 448 * @param style the output style of the display name. Valid styles are 449 * <code>SHORT</code>, <code>LONG</code>, <code>SHORT_GENERIC</code>, 450 * <code>LONG_GENERIC</code>, <code>SHORT_GMT</code>, <code>LONG_GMT</code>, 451 * <code>SHORT_COMMONLY_USED</code> or <code>GENERIC_LOCATION</code>. 452 * @param locale the locale in which to supply the display name. 453 * @return the human-readable name of this time zone in the given locale 454 * or in the default locale if the given locale is not recognized. 455 * @exception IllegalArgumentException style is invalid. 456 */ 457 public String getDisplayName(boolean daylight, int style, ULocale locale) { 458 if (style < SHORT || style > GENERIC_LOCATION) { 459 throw new IllegalArgumentException("Illegal style: " + style); 460 } 461 462 return _getDisplayName(style, daylight, locale); 463 } 464 465 /** 466 * internal version (which is called by public APIs) accepts 467 * SHORT, LONG, SHORT_GENERIC, LONG_GENERIC, SHORT_GMT, LONG_GMT, 468 * SHORT_COMMONLY_USED and GENERIC_LOCATION. 469 */ 470 private String _getDisplayName(int style, boolean daylight, ULocale locale) { 471 if (locale == null) { 472 throw new NullPointerException("locale is null"); 473 } 474 475 String result = null; 476 477 if (style == GENERIC_LOCATION || style == LONG_GENERIC || style == SHORT_GENERIC) { 478 // Generic format 479 TimeZoneFormat tzfmt = TimeZoneFormat.getInstance(locale); 480 long date = System.currentTimeMillis(); 481 Output<TimeType> timeType = new Output<TimeType>(TimeType.UNKNOWN); 482 483 switch (style) { 484 case GENERIC_LOCATION: 485 result = tzfmt.format(Style.GENERIC_LOCATION, this, date, timeType); 486 break; 487 case LONG_GENERIC: 488 result = tzfmt.format(Style.GENERIC_LONG, this, date, timeType); 489 break; 490 case SHORT_GENERIC: 491 result = tzfmt.format(Style.GENERIC_SHORT, this, date, timeType); 492 break; 493 } 494 495 // Generic format many use Localized GMT as the final fallback. 496 // When Localized GMT format is used, the result might not be 497 // appropriate for the requested daylight value. 498 if (daylight && timeType.value == TimeType.STANDARD || 499 !daylight && timeType.value == TimeType.DAYLIGHT) { 500 int offset = daylight ? getRawOffset() + getDSTSavings() : getRawOffset(); 501 result = (style == SHORT_GENERIC) ? 502 tzfmt.formatOffsetShortLocalizedGMT(offset) : tzfmt.formatOffsetLocalizedGMT(offset); 503 } 504 505 } else if (style == LONG_GMT || style == SHORT_GMT) { 506 // Offset format 507 TimeZoneFormat tzfmt = TimeZoneFormat.getInstance(locale); 508 int offset = daylight && useDaylightTime() ? getRawOffset() + getDSTSavings() : getRawOffset(); 509 switch (style) { 510 case LONG_GMT: 511 result = tzfmt.formatOffsetLocalizedGMT(offset); 512 break; 513 case SHORT_GMT: 514 result = tzfmt.formatOffsetISO8601Basic(offset, false, false, false); 515 break; 516 } 517 } else { 518 // Specific format 519 assert(style == LONG || style == SHORT || style == SHORT_COMMONLY_USED); 520 521 // Gets the name directly from TimeZoneNames 522 long date = System.currentTimeMillis(); 523 TimeZoneNames tznames = TimeZoneNames.getInstance(locale); 524 NameType nameType = null; 525 switch (style) { 526 case LONG: 527 nameType = daylight ? NameType.LONG_DAYLIGHT : NameType.LONG_STANDARD; 528 break; 529 case SHORT: 530 case SHORT_COMMONLY_USED: 531 nameType = daylight ? NameType.SHORT_DAYLIGHT : NameType.SHORT_STANDARD; 532 break; 533 } 534 result = tznames.getDisplayName(ZoneMeta.getCanonicalCLDRID(this), nameType, date); 535 if (result == null) { 536 // Fallback to localized GMT 537 TimeZoneFormat tzfmt = TimeZoneFormat.getInstance(locale); 538 int offset = daylight && useDaylightTime() ? getRawOffset() + getDSTSavings() : getRawOffset(); 539 result = (style == LONG) ? 540 tzfmt.formatOffsetLocalizedGMT(offset) : tzfmt.formatOffsetShortLocalizedGMT(offset); 541 } 542 } 543 assert(result != null); 544 545 return result; 546 } 547 548 /** 549 * Returns the amount of time to be added to local standard time 550 * to get local wall clock time. 551 * <p> 552 * The default implementation always returns 3600000 milliseconds 553 * (i.e., one hour) if this time zone observes Daylight Saving 554 * Time. Otherwise, 0 (zero) is returned. 555 * <p> 556 * If an underlying TimeZone implementation subclass supports 557 * historical Daylight Saving Time changes, this method returns 558 * the known latest daylight saving value. 559 * 560 * @return the amount of saving time in milliseconds 561 */ 562 public int getDSTSavings() { 563 if (useDaylightTime()) { 564 return 3600000; 565 } 566 return 0; 567 } 568 569 /** 570 * Queries if this time zone uses daylight savings time. 571 * @return true if this time zone uses daylight savings time, 572 * false, otherwise. 573 * <p><strong>Note:</strong>The default implementation of 574 * ICU TimeZone uses the tz database, which supports historic 575 * rule changes, for system time zones. With the implementation, 576 * there are time zones that used daylight savings time in the 577 * past, but no longer used currently. For example, Asia/Tokyo has 578 * never used daylight savings time since 1951. Most clients would 579 * expect that this method to return <code>false</code> for such case. 580 * The default implementation of this method returns <code>true</code> 581 * when the time zone uses daylight savings time in the current 582 * (Gregorian) calendar year. 583 */ 584 abstract public boolean useDaylightTime(); 585 586 /** 587 * Queries if this time zone is in daylight saving time or will observe 588 * daylight saving time at any future time. 589 * <p>The default implementation in this class returns <code>true</code> if {@link #useDaylightTime()} 590 * or {@link #inDaylightTime(Date) inDaylightTime(new Date())} returns <code>true</code>. 591 * <p> 592 * <strong>Note:</strong> This method was added for {@link java.util.TimeZone} compatibility 593 * support. The {@link java.util.TimeZone#useDaylightTime()} method only checks the last known 594 * rule(s), therefore it may return false even the zone observes daylight saving time currently. 595 * {@link java.util.TimeZone} added <code>observesDaylightTime()</code> to resolve the issue. 596 * In ICU, {@link #useDaylightTime()} works differently. The ICU implementation checks if the 597 * zone uses daylight saving time in the current calendar year. Therefore, it will never return 598 * <code>false</code> if daylight saving time is currently used. 599 * <p> 600 * ICU's TimeZone subclass implementations override this method to support the same behavior 601 * with {@link java.util.TimeZone#observesDaylightTime()}. Unlike {@link #useDaylightTime()}, 602 * the implementation does not take past daylight saving time into account, so 603 * that this method may return <code>false</code> even when {@link #useDaylightTime()} returns 604 * <code>true</code>. 605 * 606 * @return <code>true</code> if this time zone is in daylight saving time or will observe 607 * daylight saving time at any future time. 608 * @see #useDaylightTime 609 */ 610 @SuppressWarnings("javadoc") // java.util.TimeZone#observesDaylightTime() is introduced in Java 7 611 public boolean observesDaylightTime() { 612 return useDaylightTime() || inDaylightTime(new Date()); 613 } 614 615 /** 616 * Queries if the given date is in daylight savings time in 617 * this time zone. 618 * @param date the given Date. 619 * @return true if the given date is in daylight savings time, 620 * false, otherwise. 621 */ 622 abstract public boolean inDaylightTime(Date date); 623 624 /** 625 * Gets the <code>TimeZone</code> for the given ID. 626 * 627 * @param ID the ID for a <code>TimeZone</code>, such as "America/Los_Angeles", 628 * or a custom ID such as "GMT-8:00". Note that the support of abbreviations, 629 * such as "PST", is for JDK 1.1.x compatibility only and full names should be used. 630 * 631 * @return the specified <code>TimeZone</code>, or a mutable clone of the UNKNOWN_ZONE 632 * if the given ID cannot be understood or if the given ID is "Etc/Unknown". 633 * @see #UNKNOWN_ZONE 634 */ 635 public static TimeZone getTimeZone(String ID) { 636 return getTimeZone(ID, TZ_IMPL, false); 637 } 638 639 /** 640 * Gets the <code>TimeZone</code> for the given ID. The instance of <code>TimeZone</code> 641 * returned by this method is immutable. Any methods mutate the instance({@link #setID(String)}, 642 * {@link #setRawOffset(int)}) will throw <code>UnsupportedOperationException</code> upon its 643 * invocation. 644 * 645 * @param ID the ID for a <code>TimeZone</code>, such as "America/Los_Angeles", 646 * or a custom ID such as "GMT-8:00". Note that the support of abbreviations, 647 * such as "PST", is for JDK 1.1.x compatibility only and full names should be used. 648 * 649 * @return the specified <code>TimeZone</code>, or the UNKNOWN_ZONE 650 * if the given ID cannot be understood. 651 * @see #UNKNOWN_ZONE 652 */ 653 public static TimeZone getFrozenTimeZone(String ID) { 654 return getTimeZone(ID, TZ_IMPL, true); 655 } 656 657 /** 658 * Gets the <code>TimeZone</code> for the given ID and the timezone type. 659 * @param ID the ID for a <code>TimeZone</code>, such as "America/Los_Angeles", or a 660 * custom ID such as "GMT-8:00". Note that the support of abbreviations, such as 661 * "PST", is for JDK 1.1.x compatibility only and full names should be used. 662 * @param type Time zone type, either <code>TIMEZONE_ICU</code> or 663 * <code>TIMEZONE_JDK</code>. 664 * @return the specified <code>TimeZone</code>, or a mutable clone of the UNKNOWN_ZONE if the given ID 665 * cannot be understood or if the given ID is "Etc/Unknown". 666 * @see #UNKNOWN_ZONE 667 */ 668 public static TimeZone getTimeZone(String ID, int type) { 669 return getTimeZone(ID, type, false); 670 } 671 672 /** 673 * Gets the <code>TimeZone</code> for the given ID and the timezone type. 674 * @param id time zone ID 675 * @param type time zone implementation type, TIMEZONE_JDK or TIMEZONE_ICU 676 * @param frozen specify if the returned object can be frozen 677 * @return the specified <code>TimeZone</code> or UNKNOWN_ZONE if the given ID 678 * cannot be understood. 679 */ 680 private static TimeZone getTimeZone(String id, int type, boolean frozen) { 681 TimeZone result; 682 if (type == TIMEZONE_JDK) { 683 result = JavaTimeZone.createTimeZone(id); 684 if (result != null) { 685 return frozen ? result.freeze() : result; 686 } 687 result = getFrozenICUTimeZone(id, false); 688 } else { 689 result = getFrozenICUTimeZone(id, true); 690 } 691 if (result == null) { 692 LOGGER.fine("\"" +id + "\" is a bogus id so timezone is falling back to Etc/Unknown(GMT)."); 693 result = UNKNOWN_ZONE; 694 } 695 return frozen ? result : result.cloneAsThawed(); 696 } 697 698 /** 699 * Returns a frozen ICU type TimeZone object given a time zone ID. 700 * @param id the time zone ID 701 * @param trySystem if true tries the system time zones first otherwise skip to the 702 * custom time zones. 703 * @return the frozen ICU TimeZone or null if one could not be created. 704 */ 705 static BasicTimeZone getFrozenICUTimeZone(String id, boolean trySystem) { 706 BasicTimeZone result = null; 707 if (trySystem) { 708 result = ZoneMeta.getSystemTimeZone(id); 709 } 710 if (result == null) { 711 result = ZoneMeta.getCustomTimeZone(id); 712 } 713 return result; 714 } 715 716 /** 717 * Sets the default time zone type used by <code>getTimeZone</code>. 718 * @param type time zone type, either <code>TIMEZONE_ICU</code> or 719 * <code>TIMEZONE_JDK</code>. 720 * @hide unsupported on Android 721 */ 722 public static synchronized void setDefaultTimeZoneType(int type) { 723 if (type != TIMEZONE_ICU && type != TIMEZONE_JDK) { 724 throw new IllegalArgumentException("Invalid timezone type"); 725 } 726 TZ_IMPL = type; 727 } 728 729 /** 730 * <strong>[icu]</strong> Returns the default time zone type currently used. 731 * @return The default time zone type, either <code>TIMEZONE_ICU</code> or 732 * <code>TIMEZONE_JDK</code>. 733 * @hide unsupported on Android 734 */ 735 public static int getDefaultTimeZoneType() { 736 return TZ_IMPL; 737 } 738 739 /** 740 * <strong>[icu]</strong> Returns a set of time zone ID strings with the given filter conditions. 741 * <p><b>Note:</b>A <code>Set</code> returned by this method is 742 * immutable. 743 * @param zoneType The system time zone type. 744 * @param region The ISO 3166 two-letter country code or UN M.49 three-digit area code. 745 * When null, no filtering done by region. 746 * @param rawOffset An offset from GMT in milliseconds, ignoring the effect of daylight savings 747 * time, if any. When null, no filtering done by zone offset. 748 * @return an immutable set of system time zone IDs. 749 * @see SystemTimeZoneType 750 */ 751 public static Set<String> getAvailableIDs(SystemTimeZoneType zoneType, 752 String region, Integer rawOffset) { 753 return ZoneMeta.getAvailableIDs(zoneType, region, rawOffset); 754 } 755 756 /** 757 * Return a new String array containing all system TimeZone IDs 758 * with the given raw offset from GMT. These IDs may be passed to 759 * <code>get()</code> to construct the corresponding TimeZone 760 * object. 761 * @param rawOffset the offset in milliseconds from GMT 762 * @return an array of IDs for system TimeZones with the given 763 * raw offset. If there are none, return a zero-length array. 764 * @see #getAvailableIDs(SystemTimeZoneType, String, Integer) 765 */ 766 public static String[] getAvailableIDs(int rawOffset) { 767 Set<String> ids = getAvailableIDs(SystemTimeZoneType.ANY, null, Integer.valueOf(rawOffset)); 768 return ids.toArray(new String[0]); 769 } 770 771 /** 772 * Return a new String array containing all system TimeZone IDs 773 * associated with the given country. These IDs may be passed to 774 * <code>get()</code> to construct the corresponding TimeZone 775 * object. 776 * @param country a two-letter ISO 3166 country code, or <code>null</code> 777 * to return zones not associated with any country 778 * @return an array of IDs for system TimeZones in the given 779 * country. If there are none, return a zero-length array. 780 * @see #getAvailableIDs(SystemTimeZoneType, String, Integer) 781 */ 782 public static String[] getAvailableIDs(String country) { 783 Set<String> ids = getAvailableIDs(SystemTimeZoneType.ANY, country, null); 784 return ids.toArray(new String[0]); 785 } 786 787 /** 788 * Return a new String array containing all system TimeZone IDs. 789 * These IDs (and only these IDs) may be passed to 790 * <code>get()</code> to construct the corresponding TimeZone 791 * object. 792 * @return an array of all system TimeZone IDs 793 * @see #getAvailableIDs(SystemTimeZoneType, String, Integer) 794 */ 795 public static String[] getAvailableIDs() { 796 Set<String> ids = getAvailableIDs(SystemTimeZoneType.ANY, null, null); 797 return ids.toArray(new String[0]); 798 } 799 800 /** 801 * <strong>[icu]</strong> Returns the number of IDs in the equivalency group that 802 * includes the given ID. An equivalency group contains zones 803 * that have the same GMT offset and rules. 804 * 805 * <p>The returned count includes the given ID; it is always >= 1 806 * for valid IDs. The given ID must be a system time zone. If it 807 * is not, returns zero. 808 * @param id a system time zone ID 809 * @return the number of zones in the equivalency group containing 810 * 'id', or zero if 'id' is not a valid system ID 811 * @see #getEquivalentID 812 */ 813 public static int countEquivalentIDs(String id) { 814 return ZoneMeta.countEquivalentIDs(id); 815 } 816 817 /** 818 * Returns an ID in the equivalency group that 819 * includes the given ID. An equivalency group contains zones 820 * that have the same GMT offset and rules. 821 * 822 * <p>The given index must be in the range 0..n-1, where n is the 823 * value returned by <code>countEquivalentIDs(id)</code>. For 824 * some value of 'index', the returned value will be equal to the 825 * given id. If the given id is not a valid system time zone, or 826 * if 'index' is out of range, then returns an empty string. 827 * @param id a system time zone ID 828 * @param index a value from 0 to n-1, where n is the value 829 * returned by <code>countEquivalentIDs(id)</code> 830 * @return the ID of the index-th zone in the equivalency group 831 * containing 'id', or an empty string if 'id' is not a valid 832 * system ID or 'index' is out of range 833 * @see #countEquivalentIDs 834 */ 835 public static String getEquivalentID(String id, int index) { 836 return ZoneMeta.getEquivalentID(id, index); 837 } 838 839 /** 840 * Gets the default <code>TimeZone</code> for this host. 841 * The source of the default <code>TimeZone</code> 842 * may vary with implementation. 843 * @return a default <code>TimeZone</code>. 844 */ 845 public static TimeZone getDefault() { 846 // Copy the reference to the current defaultZone, 847 // so it won't be affected by setDefault(). 848 TimeZone tmpDefaultZone = defaultZone; 849 850 if (tmpDefaultZone == null) { 851 synchronized (java.util.TimeZone.class) { 852 synchronized(TimeZone.class) { 853 tmpDefaultZone = defaultZone; 854 if (tmpDefaultZone == null) { 855 if (TZ_IMPL == TIMEZONE_JDK) { 856 tmpDefaultZone = new JavaTimeZone(); 857 } else { 858 java.util.TimeZone temp = java.util.TimeZone.getDefault(); 859 tmpDefaultZone = getFrozenTimeZone(temp.getID()); 860 } 861 defaultZone = tmpDefaultZone; 862 } 863 } 864 } 865 } 866 867 return tmpDefaultZone.cloneAsThawed(); 868 } 869 870 /** 871 * Sets the <code>TimeZone</code> that is returned by the <code>getDefault</code> 872 * method. This method also sets a Java TimeZone equivalent to the input <code>tz</code> 873 * as the JVM's default time zone if not null. If <code>tz</code> is null, next 874 * {@link #getDefault()} method invocation will reset the default time zone 875 * synchronized with the JVM's default at that time. 876 * 877 * @param tz the new default time zone 878 * @hide unsupported on Android 879 */ 880 public static synchronized void setDefault(TimeZone tz) { 881 // Set default ICU time zone, used by #getDefault() 882 setICUDefault(tz); 883 884 if (tz != null) { 885 // Keep java.util.TimeZone default in sync so java.util.Date 886 // can interoperate with android.icu.util classes. 887 java.util.TimeZone jdkZone = null; 888 if (tz instanceof JavaTimeZone) { 889 jdkZone = ((JavaTimeZone)tz).unwrap(); 890 } else if (tz instanceof android.icu.impl.OlsonTimeZone) { 891 // Because of the lack of APIs supporting historic 892 // zone offset/dst saving in JDK TimeZone, 893 // wrapping ICU TimeZone with JDK TimeZone will 894 // cause historic offset calculation in Calendar/Date. 895 // JDK calendar implementation calls getRawOffset() and 896 // getDSTSavings() when the instance of JDK TimeZone 897 // is not an instance of JDK internal TimeZone subclass 898 // (sun.util.calendar.ZoneInfo). Ticket#6459 899 String icuID = tz.getID(); 900 jdkZone = java.util.TimeZone.getTimeZone(icuID); 901 if (!icuID.equals(jdkZone.getID())) { 902 // If the ID was unknown, retry with the canonicalized 903 // ID instead. This will ensure that JDK 1.1.x 904 // compatibility IDs supported by ICU (but not 905 // necessarily supported by the platform) work. 906 // Ticket#11483 907 icuID = getCanonicalID(icuID); 908 jdkZone = java.util.TimeZone.getTimeZone(icuID); 909 if (!icuID.equals(jdkZone.getID())) { 910 // JDK does not know the ID.. 911 jdkZone = null; 912 } 913 } 914 } 915 if (jdkZone == null) { 916 jdkZone = TimeZoneAdapter.wrap(tz); 917 } 918 java.util.TimeZone.setDefault(jdkZone); 919 } 920 } 921 922 /** 923 * Sets the <code>TimeZone</code> that is returned by the <code>getDefault</code> 924 * method. If <code>tz</code> is null, next {@link #getDefault()} method invocation 925 * will reset the default time zone synchronized with the JVM's default at that time. 926 * Unlike {@link #setDefault(TimeZone)}, this method does not change the JVM's 927 * default time zone. 928 * 929 * @param tz the new default time zone 930 * @deprecated This API is ICU internal only. 931 * @hide draft / provisional / internal are hidden on Android 932 */ 933 @Deprecated 934 public static synchronized void setICUDefault(TimeZone tz) { 935 if (tz == null) { 936 defaultZone = null; 937 } else if (tz.isFrozen()) { 938 // No need to create a defensive copy 939 defaultZone = tz; 940 } else { 941 // Creates a defensive copy and freeze it 942 defaultZone = ((TimeZone)tz.clone()).freeze(); 943 } 944 } 945 946 /** 947 * Returns true if this zone has the same rule and offset as another zone. 948 * That is, if this zone differs only in ID, if at all. Returns false 949 * if the other zone is null. 950 * @param other the <code>TimeZone</code> object to be compared with 951 * @return true if the other zone is not null and is the same as this one, 952 * with the possible exception of the ID 953 */ 954 public boolean hasSameRules(TimeZone other) { 955 return other != null && 956 getRawOffset() == other.getRawOffset() && 957 useDaylightTime() == other.useDaylightTime(); 958 } 959 960 /** 961 * Overrides clone. 962 */ 963 @Override 964 public Object clone() { 965 if (isFrozen()) { 966 return this; 967 } 968 return cloneAsThawed(); 969 } 970 971 /** 972 * Overrides equals. 973 */ 974 @Override 975 public boolean equals(Object obj){ 976 if (this == obj) return true; 977 if (obj == null || getClass() != obj.getClass()) return false; 978 return (ID.equals(((TimeZone)obj).ID)); 979 } 980 981 /** 982 * Overrides hashCode. 983 */ 984 @Override 985 public int hashCode(){ 986 return ID.hashCode(); 987 } 988 989 /** 990 * <strong>[icu]</strong> Returns the time zone data version currently used by ICU. 991 * 992 * @return the version string, such as "2007f" 993 * @throws MissingResourceException if ICU time zone resource bundle 994 * is missing or the version information is not available. 995 */ 996 public static String getTZDataVersion() { 997 // The implementation had been moved to VersionInfo. 998 return VersionInfo.getTZDataVersion(); 999 } 1000 1001 /** 1002 * <strong>[icu]</strong> Returns the canonical system time zone ID or the normalized 1003 * custom time zone ID for the given time zone ID. 1004 * @param id The input time zone ID to be canonicalized. 1005 * @return The canonical system time zone ID or the custom time zone ID 1006 * in normalized format for the given time zone ID. When the given time zone ID 1007 * is neither a known system time zone ID nor a valid custom time zone ID, 1008 * null is returned. 1009 */ 1010 public static String getCanonicalID(String id) { 1011 return getCanonicalID(id, null); 1012 } 1013 1014 /** 1015 * <strong>[icu]</strong> Returns the canonical system time zone ID or the normalized 1016 * custom time zone ID for the given time zone ID. 1017 * @param id The input time zone ID to be canonicalized. 1018 * @param isSystemID When non-null boolean array is specified and 1019 * the given ID is a known system time zone ID, true is set to <code>isSystemID[0]</code> 1020 * @return The canonical system time zone ID or the custom time zone ID 1021 * in normalized format for the given time zone ID. When the given time zone ID 1022 * is neither a known system time zone ID nor a valid custom time zone ID, 1023 * null is returned. 1024 */ 1025 public static String getCanonicalID(String id, boolean[] isSystemID) { 1026 String canonicalID = null; 1027 boolean systemTzid = false; 1028 if (id != null && id.length() != 0) { 1029 if (id.equals(TimeZone.UNKNOWN_ZONE_ID)) { 1030 // special case - Etc/Unknown is a canonical ID, but not system ID 1031 canonicalID = TimeZone.UNKNOWN_ZONE_ID; 1032 systemTzid = false; 1033 } else { 1034 canonicalID = ZoneMeta.getCanonicalCLDRID(id); 1035 if (canonicalID != null) { 1036 systemTzid = true; 1037 } else { 1038 canonicalID = ZoneMeta.getCustomID(id); 1039 } 1040 } 1041 } 1042 if (isSystemID != null) { 1043 isSystemID[0] = systemTzid; 1044 } 1045 return canonicalID; 1046 } 1047 1048 /** 1049 * <strong>[icu]</strong> Returns the region code associated with the given 1050 * system time zone ID. The region code is either ISO 3166 1051 * 2-letter country code or UN M.49 3-digit area code. 1052 * When the time zone is not associated with a specific location, 1053 * for example - "Etc/UTC", "EST5EDT", then this method returns 1054 * "001" (UN M.49 area code for World). 1055 * @param id the system time zone ID. 1056 * @return the region code associated with the given 1057 * system time zone ID. 1058 * @throws IllegalArgumentException if <code>id</code> is not a known system ID. 1059 * @see #getAvailableIDs(String) 1060 */ 1061 public static String getRegion(String id) { 1062 String region = null; 1063 // "Etc/Unknown" is not a system time zone ID, 1064 // but in the zone data. 1065 if (!id.equals(UNKNOWN_ZONE_ID)) { 1066 region = ZoneMeta.getRegion(id); 1067 } 1068 if (region == null) { 1069 // unknown id 1070 throw new IllegalArgumentException("Unknown system zone id: " + id); 1071 } 1072 return region; 1073 } 1074 1075 /** 1076 * <strong>[icu]</strong> Converts a system time zone ID to an equivalent Windows time zone ID. For example, 1077 * Windows time zone ID "Pacific Standard Time" is returned for input "America/Los_Angeles". 1078 * 1079 * <p>There are system time zones that cannot be mapped to Windows zones. When the input 1080 * system time zone ID is unknown or unmappable to a Windows time zone, then this 1081 * method returns <code>null</code>. 1082 * 1083 * <p>This implementation utilizes <a href="http://unicode.org/cldr/charts/supplemental/zone_tzid.html"> 1084 * Zone-Tzid mapping data</a>. The mapping data is updated time to time. To get the latest changes, 1085 * please read the ICU user guide section <a href="http://userguide.icu-project.org/datetime/timezone#TOC-Updating-the-Time-Zone-Data"> 1086 * Updating the Time Zone Data</a>. 1087 * 1088 * @param id A system time zone ID 1089 * @return A Windows time zone ID mapped from the input system time zone ID, 1090 * or <code>null</code> when the input ID is unknown or unmappable. 1091 * @see #getIDForWindowsID(String, String) 1092 */ 1093 public static String getWindowsID(String id) { 1094 // canonicalize the input ID 1095 boolean[] isSystemID = {false}; 1096 id = getCanonicalID(id, isSystemID); 1097 if (!isSystemID[0]) { 1098 // mapping data is only applicable to tz database IDs 1099 return null; 1100 } 1101 1102 UResourceBundle top = UResourceBundle.getBundleInstance( 1103 ICUData.ICU_BASE_NAME, "windowsZones", ICUResourceBundle.ICU_DATA_CLASS_LOADER); 1104 UResourceBundle mapTimezones = top.get("mapTimezones"); 1105 1106 UResourceBundleIterator resitr = mapTimezones.getIterator(); 1107 while (resitr.hasNext()) { 1108 UResourceBundle winzone = resitr.next(); 1109 if (winzone.getType() != UResourceBundle.TABLE) { 1110 continue; 1111 } 1112 UResourceBundleIterator rgitr = winzone.getIterator(); 1113 while (rgitr.hasNext()) { 1114 UResourceBundle regionalData = rgitr.next(); 1115 if (regionalData.getType() != UResourceBundle.STRING) { 1116 continue; 1117 } 1118 String[] tzids = regionalData.getString().split(" "); 1119 for (String tzid : tzids) { 1120 if (tzid.equals(id)) { 1121 return winzone.getKey(); 1122 } 1123 } 1124 } 1125 } 1126 1127 return null; 1128 } 1129 1130 /** 1131 * <strong>[icu]</strong> Converts a Windows time zone ID to an equivalent system time zone ID 1132 * for a region. For example, system time zone ID "America/Los_Angeles" is returned 1133 * for input Windows ID "Pacific Standard Time" and region "US" (or <code>null</code>), 1134 * "America/Vancouver" is returned for the same Windows ID "Pacific Standard Time" and 1135 * region "CA". 1136 * 1137 * <p>Not all Windows time zones can be mapped to system time zones. When the input 1138 * Windows time zone ID is unknown or unmappable to a system time zone, then this 1139 * method returns <code>null</code>. 1140 * 1141 * <p>This implementation utilizes <a href="http://unicode.org/cldr/charts/supplemental/zone_tzid.html"> 1142 * Zone-Tzid mapping data</a>. The mapping data is updated time to time. To get the latest changes, 1143 * please read the ICU user guide section <a href="http://userguide.icu-project.org/datetime/timezone#TOC-Updating-the-Time-Zone-Data"> 1144 * Updating the Time Zone Data</a>. 1145 * 1146 * @param winid A Windows time zone ID 1147 * @param region A region code, or <code>null</code> if no regional preference. 1148 * @return A system time zone ID mapped from the input Windows time zone ID, 1149 * or <code>null</code> when the input ID is unknown or unmappable. 1150 * @see #getWindowsID(String) 1151 */ 1152 public static String getIDForWindowsID(String winid, String region) { 1153 String id = null; 1154 1155 UResourceBundle top = UResourceBundle.getBundleInstance( 1156 ICUData.ICU_BASE_NAME, "windowsZones", ICUResourceBundle.ICU_DATA_CLASS_LOADER); 1157 UResourceBundle mapTimezones = top.get("mapTimezones"); 1158 1159 try { 1160 UResourceBundle zones = mapTimezones.get(winid); 1161 if (region != null) { 1162 try { 1163 id = zones.getString(region); 1164 if (id != null) { 1165 // first ID delimited by space is the default one 1166 int endIdx = id.indexOf(' '); 1167 if (endIdx > 0) { 1168 id = id.substring(0, endIdx); 1169 } 1170 } 1171 } catch (MissingResourceException e) { 1172 // no explicit region mapping found 1173 } 1174 } 1175 if (id == null) { 1176 id = zones.getString("001"); 1177 } 1178 } catch (MissingResourceException e) { 1179 // no mapping data found 1180 } 1181 1182 return id; 1183 } 1184 1185 // Freezable stuffs 1186 1187 /** 1188 * {@inheritDoc} 1189 */ 1190 @Override 1191 public boolean isFrozen() { 1192 return false; 1193 } 1194 1195 /** 1196 * {@inheritDoc} 1197 */ 1198 @Override 1199 public TimeZone freeze() { 1200 throw new UnsupportedOperationException("Needs to be implemented by the subclass."); 1201 } 1202 1203 /** 1204 * {@inheritDoc} 1205 */ 1206 @Override 1207 public TimeZone cloneAsThawed() { 1208 try { 1209 TimeZone other = (TimeZone) super.clone(); 1210 return other; 1211 } catch (CloneNotSupportedException e) { 1212 throw new ICUCloneNotSupportedException(e); 1213 } 1214 } 1215 1216 // =======================privates=============================== 1217 1218 /** 1219 * The string identifier of this <code>TimeZone</code>. This is a 1220 * programmatic identifier used internally to look up <code>TimeZone</code> 1221 * objects from the system table and also to map them to their localized 1222 * display names. <code>ID</code> values are unique in the system 1223 * table but may not be for dynamically created zones. 1224 * @serial 1225 */ 1226 private String ID; 1227 1228 /** 1229 * The default time zone, or null if not set. 1230 */ 1231 private static volatile TimeZone defaultZone = null; 1232 1233 /** 1234 * TimeZone implementation type 1235 */ 1236 private static int TZ_IMPL = TIMEZONE_ICU; 1237 1238 /** 1239 * TimeZone implementation type initialization 1240 */ 1241 private static final String TZIMPL_CONFIG_KEY = "android.icu.util.TimeZone.DefaultTimeZoneType"; 1242 private static final String TZIMPL_CONFIG_ICU = "ICU"; 1243 private static final String TZIMPL_CONFIG_JDK = "JDK"; 1244 1245 static { 1246 String type = ICUConfig.get(TZIMPL_CONFIG_KEY, TZIMPL_CONFIG_ICU); 1247 if (type.equalsIgnoreCase(TZIMPL_CONFIG_JDK)) { 1248 TZ_IMPL = TIMEZONE_JDK; 1249 } 1250 } 1251 1252 /* 1253 * ConstantZone is a private TimeZone subclass dedicated for the two TimeZone class 1254 * constants - TimeZone.GMT_ZONE and TimeZone.UNKNOWN_ZONE. Previously, these zones 1255 * are instances of SimpleTimeZone. However, when the SimpleTimeZone constructor and 1256 * TimeZone's static methods (such as TimeZone.getDefault()) are called from multiple 1257 * threads at the same time, it causes a deadlock by TimeZone's static initializer 1258 * and SimpleTimeZone's static initializer. To avoid this issue, these TimeZone 1259 * constants (GMT/UNKNOWN) must be implemented by a class not visible from users. 1260 * See ticket#11343. 1261 */ 1262 private static final class ConstantZone extends TimeZone { 1263 private static final long serialVersionUID = 1L; 1264 1265 private int rawOffset; 1266 1267 private ConstantZone(int rawOffset, String ID) { 1268 super(ID); 1269 this.rawOffset = rawOffset; 1270 } 1271 1272 @Override 1273 public int getOffset(int era, int year, int month, int day, int dayOfWeek, int milliseconds) { 1274 return rawOffset; 1275 } 1276 1277 @Override 1278 public void setRawOffset(int offsetMillis) { 1279 if (isFrozen()) { 1280 throw new UnsupportedOperationException("Attempt to modify a frozen TimeZone instance."); 1281 } 1282 rawOffset = offsetMillis; 1283 } 1284 1285 @Override 1286 public int getRawOffset() { 1287 return rawOffset; 1288 } 1289 1290 @Override 1291 public boolean useDaylightTime() { 1292 return false; 1293 } 1294 1295 @Override 1296 public boolean inDaylightTime(Date date) { 1297 return false; 1298 } 1299 1300 private volatile transient boolean isFrozen = false; 1301 1302 @Override 1303 public boolean isFrozen() { 1304 return isFrozen; 1305 } 1306 1307 @Override 1308 public TimeZone freeze() { 1309 isFrozen = true; 1310 return this; 1311 } 1312 1313 @Override 1314 public TimeZone cloneAsThawed() { 1315 ConstantZone tz = (ConstantZone)super.cloneAsThawed(); 1316 tz.isFrozen = false; 1317 return tz; 1318 } 1319 } 1320} 1321 1322//eof 1323