1 /* 2 * Copyright (C) 2014 The Android Open Source Project 3 * Copyright (c) 1996, 2013, Oracle and/or its affiliates. All rights reserved. 4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 5 * 6 * This code is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License version 2 only, as 8 * published by the Free Software Foundation. Oracle designates this 9 * particular file as subject to the "Classpath" exception as provided 10 * by Oracle in the LICENSE file that accompanied this code. 11 * 12 * This code is distributed in the hope that it will be useful, but WITHOUT 13 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 14 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 15 * version 2 for more details (a copy is included in the LICENSE file that 16 * accompanied this code). 17 * 18 * You should have received a copy of the GNU General Public License version 19 * 2 along with this work; if not, write to the Free Software Foundation, 20 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 21 * 22 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 23 * or visit www.oracle.com if you need additional information or have any 24 * questions. 25 */ 26 27 /* 28 * (C) Copyright Taligent, Inc. 1996 - All Rights Reserved 29 * (C) Copyright IBM Corp. 1996 - All Rights Reserved 30 * 31 * The original version of this source code and documentation is copyrighted 32 * and owned by Taligent, Inc., a wholly-owned subsidiary of IBM. These 33 * materials are provided under terms of a License Agreement between Taligent 34 * and Sun. This technology is protected by multiple US and International 35 * patents. This notice and attribution to Taligent may not be removed. 36 * Taligent is a registered trademark of Taligent, Inc. 37 * 38 */ 39 40 package java.util; 41 42 import android.icu.text.TimeZoneNames; 43 import com.android.i18n.timezone.ZoneInfoData; 44 import com.android.i18n.timezone.ZoneInfoDb; 45 import java.io.IOException; 46 import java.io.Serializable; 47 import java.time.ZoneId; 48 import java.util.function.Supplier; 49 import java.util.regex.Matcher; 50 import java.util.regex.Pattern; 51 import libcore.io.IoUtils; 52 import libcore.util.ZoneInfo; 53 54 import dalvik.system.RuntimeHooks; 55 56 /** 57 * <code>TimeZone</code> represents a time zone offset, and also figures out daylight 58 * savings. 59 * 60 * <p> 61 * Typically, you get a <code>TimeZone</code> using <code>getDefault</code> 62 * which creates a <code>TimeZone</code> based on the time zone where the program 63 * is running. For example, for a program running in Japan, <code>getDefault</code> 64 * creates a <code>TimeZone</code> object based on Japanese Standard Time. 65 * 66 * <p> 67 * You can also get a <code>TimeZone</code> using <code>getTimeZone</code> 68 * along with a time zone ID. For instance, the time zone ID for the 69 * U.S. Pacific Time zone is "America/Los_Angeles". So, you can get a 70 * U.S. Pacific Time <code>TimeZone</code> object with: 71 * <blockquote><pre> 72 * TimeZone tz = TimeZone.getTimeZone("America/Los_Angeles"); 73 * </pre></blockquote> 74 * You can use the <code>getAvailableIDs</code> method to iterate through 75 * all the supported time zone IDs. You can then choose a 76 * supported ID to get a <code>TimeZone</code>. 77 * If the time zone you want is not represented by one of the 78 * supported IDs, then a custom time zone ID can be specified to 79 * produce a TimeZone. The syntax of a custom time zone ID is: 80 * 81 * <blockquote><pre> 82 * <a name="CustomID"><i>CustomID:</i></a> 83 * <code>GMT</code> <i>Sign</i> <i>Hours</i> <code>:</code> <i>Minutes</i> 84 * <code>GMT</code> <i>Sign</i> <i>Hours</i> <i>Minutes</i> 85 * <code>GMT</code> <i>Sign</i> <i>Hours</i> 86 * <i>Sign:</i> one of 87 * <code>+ -</code> 88 * <i>Hours:</i> 89 * <i>Digit</i> 90 * <i>Digit</i> <i>Digit</i> 91 * <i>Minutes:</i> 92 * <i>Digit</i> <i>Digit</i> 93 * <i>Digit:</i> one of 94 * <code>0 1 2 3 4 5 6 7 8 9</code> 95 * </pre></blockquote> 96 * 97 * <i>Hours</i> must be between 0 to 23 and <i>Minutes</i> must be 98 * between 00 to 59. For example, "GMT+10" and "GMT+0010" mean ten 99 * hours and ten minutes ahead of GMT, respectively. 100 * <p> 101 * The format is locale independent and digits must be taken from the 102 * Basic Latin block of the Unicode standard. No daylight saving time 103 * transition schedule can be specified with a custom time zone ID. If 104 * the specified string doesn't match the syntax, <code>"GMT"</code> 105 * is used. 106 * <p> 107 * When creating a <code>TimeZone</code>, the specified custom time 108 * zone ID is normalized in the following syntax: 109 * <blockquote><pre> 110 * <a name="NormalizedCustomID"><i>NormalizedCustomID:</i></a> 111 * <code>GMT</code> <i>Sign</i> <i>TwoDigitHours</i> <code>:</code> <i>Minutes</i> 112 * <i>Sign:</i> one of 113 * <code>+ -</code> 114 * <i>TwoDigitHours:</i> 115 * <i>Digit</i> <i>Digit</i> 116 * <i>Minutes:</i> 117 * <i>Digit</i> <i>Digit</i> 118 * <i>Digit:</i> one of 119 * <code>0 1 2 3 4 5 6 7 8 9</code> 120 * </pre></blockquote> 121 * For example, TimeZone.getTimeZone("GMT-8").getID() returns "GMT-08:00". 122 * 123 * <h3>Three-letter time zone IDs</h3> 124 * 125 * For compatibility with JDK 1.1.x, some other three-letter time zone IDs 126 * (such as "PST", "CTT", "AST") are also supported. However, <strong>their 127 * use is deprecated</strong> because the same abbreviation is often used 128 * for multiple time zones (for example, "CST" could be U.S. "Central Standard 129 * Time" and "China Standard Time"), and the Java platform can then only 130 * recognize one of them. 131 * 132 * 133 * @see Calendar 134 * @see GregorianCalendar 135 * @see SimpleTimeZone 136 * @author Mark Davis, David Goldsmith, Chen-Lieh Huang, Alan Liu 137 * @since JDK1.1 138 */ 139 abstract public class TimeZone implements Serializable, Cloneable { 140 /** 141 * Sole constructor. (For invocation by subclass constructors, typically 142 * implicit.) 143 */ TimeZone()144 public TimeZone() { 145 } 146 147 /** 148 * A style specifier for <code>getDisplayName()</code> indicating 149 * a short name, such as "PST." 150 * @see #LONG 151 * @since 1.2 152 */ 153 public static final int SHORT = 0; 154 155 /** 156 * A style specifier for <code>getDisplayName()</code> indicating 157 * a long name, such as "Pacific Standard Time." 158 * @see #SHORT 159 * @since 1.2 160 */ 161 public static final int LONG = 1; 162 163 // Android-changed: Use a preload holder to allow compile-time initialization of TimeZone and 164 // dependents. 165 private static class NoImagePreloadHolder { 166 public static final Pattern CUSTOM_ZONE_ID_PATTERN = Pattern.compile("^GMT[-+](\\d{1,2})(:?(\\d\\d))?$"); 167 } 168 169 // Proclaim serialization compatibility with JDK 1.1 170 static final long serialVersionUID = 3581463369166924961L; 171 172 // Android-changed: common timezone instances. 173 private static final TimeZone GMT = new SimpleTimeZone(0, "GMT"); 174 private static final TimeZone UTC = new SimpleTimeZone(0, "UTC"); 175 176 /** 177 * Gets the time zone offset, for current date, modified in case of 178 * daylight savings. This is the offset to add to UTC to get local time. 179 * <p> 180 * This method returns a historically correct offset if an 181 * underlying <code>TimeZone</code> implementation subclass 182 * supports historical Daylight Saving Time schedule and GMT 183 * offset changes. 184 * 185 * @param era the era of the given date. 186 * @param year the year in the given date. 187 * @param month the month in the given date. 188 * Month is 0-based. e.g., 0 for January. 189 * @param day the day-in-month of the given date. 190 * @param dayOfWeek the day-of-week of the given date. 191 * @param milliseconds the milliseconds in day in <em>standard</em> 192 * local time. 193 * 194 * @return the offset in milliseconds to add to GMT to get local time. 195 * 196 * @see Calendar#ZONE_OFFSET 197 * @see Calendar#DST_OFFSET 198 */ getOffset(int era, int year, int month, int day, int dayOfWeek, int milliseconds)199 public abstract int getOffset(int era, int year, int month, int day, 200 int dayOfWeek, int milliseconds); 201 202 /** 203 * Returns the offset of this time zone from UTC at the specified 204 * date. If Daylight Saving Time is in effect at the specified 205 * date, the offset value is adjusted with the amount of daylight 206 * saving. 207 * <p> 208 * This method returns a historically correct offset value if an 209 * underlying TimeZone implementation subclass supports historical 210 * Daylight Saving Time schedule and GMT offset changes. 211 * 212 * @param date the date represented in milliseconds since January 1, 1970 00:00:00 GMT 213 * @return the amount of time in milliseconds to add to UTC to get local time. 214 * 215 * @see Calendar#ZONE_OFFSET 216 * @see Calendar#DST_OFFSET 217 * @since 1.4 218 */ getOffset(long date)219 public int getOffset(long date) { 220 if (inDaylightTime(new Date(date))) { 221 return getRawOffset() + getDSTSavings(); 222 } 223 return getRawOffset(); 224 } 225 226 /** 227 * Gets the raw GMT offset and the amount of daylight saving of this 228 * time zone at the given time. 229 * @param date the milliseconds (since January 1, 1970, 230 * 00:00:00.000 GMT) at which the time zone offset and daylight 231 * saving amount are found 232 * @param offsets an array of int where the raw GMT offset 233 * (offset[0]) and daylight saving amount (offset[1]) are stored, 234 * or null if those values are not needed. The method assumes that 235 * the length of the given array is two or larger. 236 * @return the total amount of the raw GMT offset and daylight 237 * saving at the specified date. 238 * 239 * @see Calendar#ZONE_OFFSET 240 * @see Calendar#DST_OFFSET 241 */ getOffsets(long date, int[] offsets)242 int getOffsets(long date, int[] offsets) { 243 int rawoffset = getRawOffset(); 244 int dstoffset = 0; 245 if (inDaylightTime(new Date(date))) { 246 dstoffset = getDSTSavings(); 247 } 248 if (offsets != null) { 249 offsets[0] = rawoffset; 250 offsets[1] = dstoffset; 251 } 252 return rawoffset + dstoffset; 253 } 254 255 /** 256 * Sets the base time zone offset to GMT. 257 * This is the offset to add to UTC to get local time. 258 * <p> 259 * If an underlying <code>TimeZone</code> implementation subclass 260 * supports historical GMT offset changes, the specified GMT 261 * offset is set as the latest GMT offset and the difference from 262 * the known latest GMT offset value is used to adjust all 263 * historical GMT offset values. 264 * 265 * @param offsetMillis the given base time zone offset to GMT. 266 */ setRawOffset(int offsetMillis)267 abstract public void setRawOffset(int offsetMillis); 268 269 /** 270 * Returns the amount of time in milliseconds to add to UTC to get 271 * standard time in this time zone. Because this value is not 272 * affected by daylight saving time, it is called <I>raw 273 * offset</I>. 274 * <p> 275 * If an underlying <code>TimeZone</code> implementation subclass 276 * supports historical GMT offset changes, the method returns the 277 * raw offset value of the current date. In Honolulu, for example, 278 * its raw offset changed from GMT-10:30 to GMT-10:00 in 1947, and 279 * this method always returns -36000000 milliseconds (i.e., -10 280 * hours). 281 * 282 * @return the amount of raw offset time in milliseconds to add to UTC. 283 * @see Calendar#ZONE_OFFSET 284 */ getRawOffset()285 public abstract int getRawOffset(); 286 287 /** 288 * Gets the ID of this time zone. 289 * @return the ID of this time zone. 290 */ getID()291 public String getID() 292 { 293 return ID; 294 } 295 296 /** 297 * Sets the time zone ID. This does not change any other data in 298 * the time zone object. 299 * @param ID the new time zone ID. 300 */ setID(String ID)301 public void setID(String ID) 302 { 303 if (ID == null) { 304 throw new NullPointerException(); 305 } 306 this.ID = ID; 307 } 308 309 /** 310 * Returns a long standard time name of this {@code TimeZone} suitable for 311 * presentation to the user in the default locale. 312 * 313 * <p>This method is equivalent to: 314 * <blockquote><pre> 315 * getDisplayName(false, {@link #LONG}, 316 * Locale.getDefault({@link Locale.Category#DISPLAY})) 317 * </pre></blockquote> 318 * 319 * @return the human-readable name of this time zone in the default locale. 320 * @since 1.2 321 * @see #getDisplayName(boolean, int, Locale) 322 * @see Locale#getDefault(Locale.Category) 323 * @see Locale.Category 324 */ getDisplayName()325 public final String getDisplayName() { 326 return getDisplayName(false, LONG, 327 Locale.getDefault(Locale.Category.DISPLAY)); 328 } 329 330 /** 331 * Returns a long standard time name of this {@code TimeZone} suitable for 332 * presentation to the user in the specified {@code locale}. 333 * 334 * <p>This method is equivalent to: 335 * <blockquote><pre> 336 * getDisplayName(false, {@link #LONG}, locale) 337 * </pre></blockquote> 338 * 339 * @param locale the locale in which to supply the display name. 340 * @return the human-readable name of this time zone in the given locale. 341 * @exception NullPointerException if {@code locale} is {@code null}. 342 * @since 1.2 343 * @see #getDisplayName(boolean, int, Locale) 344 */ getDisplayName(Locale locale)345 public final String getDisplayName(Locale locale) { 346 return getDisplayName(false, LONG, locale); 347 } 348 349 /** 350 * Returns a name in the specified {@code style} of this {@code TimeZone} 351 * suitable for presentation to the user in the default locale. If the 352 * specified {@code daylight} is {@code true}, a Daylight Saving Time name 353 * is returned (even if this {@code TimeZone} doesn't observe Daylight Saving 354 * Time). Otherwise, a Standard Time name is returned. 355 * 356 * <p>This method is equivalent to: 357 * <blockquote><pre> 358 * getDisplayName(daylight, style, 359 * Locale.getDefault({@link Locale.Category#DISPLAY})) 360 * </pre></blockquote> 361 * 362 * @param daylight {@code true} specifying a Daylight Saving Time name, or 363 * {@code false} specifying a Standard Time name 364 * @param style either {@link #LONG} or {@link #SHORT} 365 * @return the human-readable name of this time zone in the default locale. 366 * @exception IllegalArgumentException if {@code style} is invalid. 367 * @since 1.2 368 * @see #getDisplayName(boolean, int, Locale) 369 * @see Locale#getDefault(Locale.Category) 370 * @see Locale.Category 371 * @see java.text.DateFormatSymbols#getZoneStrings() 372 */ getDisplayName(boolean daylight, int style)373 public final String getDisplayName(boolean daylight, int style) { 374 return getDisplayName(daylight, style, 375 Locale.getDefault(Locale.Category.DISPLAY)); 376 } 377 378 /** 379 * Returns the {@link #SHORT short} or {@link #LONG long} name of this time 380 * zone with either standard or daylight time, as written in {@code locale}. 381 * If the name is not available, the result is in the format 382 * {@code GMT[+-]hh:mm}. 383 * 384 * @param daylightTime true for daylight time, false for standard time. 385 * @param style either {@link TimeZone#LONG} or {@link TimeZone#SHORT}. 386 * @param locale the display locale. 387 */ getDisplayName(boolean daylightTime, int style, Locale locale)388 public String getDisplayName(boolean daylightTime, int style, Locale locale) { 389 // BEGIN Android-changed: implement using android.icu.text.TimeZoneNames 390 TimeZoneNames.NameType nameType; 391 switch (style) { 392 case SHORT: 393 nameType = daylightTime 394 ? TimeZoneNames.NameType.SHORT_DAYLIGHT 395 : TimeZoneNames.NameType.SHORT_STANDARD; 396 break; 397 case LONG: 398 nameType = daylightTime 399 ? TimeZoneNames.NameType.LONG_DAYLIGHT 400 : TimeZoneNames.NameType.LONG_STANDARD; 401 break; 402 default: 403 throw new IllegalArgumentException("Illegal style: " + style); 404 } 405 String canonicalID = android.icu.util.TimeZone.getCanonicalID(getID()); 406 if (canonicalID != null) { 407 TimeZoneNames names = TimeZoneNames.getInstance(locale); 408 long now = System.currentTimeMillis(); 409 String displayName = names.getDisplayName(canonicalID, nameType, now); 410 if (displayName != null) { 411 return displayName; 412 } 413 } 414 415 // We get here if this is a custom timezone or ICU doesn't have name data for the specific 416 // style and locale. 417 int offsetMillis = getRawOffset(); 418 if (daylightTime) { 419 offsetMillis += getDSTSavings(); 420 } 421 return createGmtOffsetString(true /* includeGmt */, true /* includeMinuteSeparator */, 422 offsetMillis); 423 // END Android-changed: implement using android.icu.text.TimeZoneNames 424 } 425 426 // BEGIN Android-added: utility method to format an offset as a GMT offset string. 427 /** 428 * Returns a string representation of an offset from UTC. 429 * 430 * <p>The format is "[GMT](+|-)HH[:]MM". The output is not localized. 431 * 432 * @param includeGmt true to include "GMT", false to exclude 433 * @param includeMinuteSeparator true to include the separator between hours and minutes, false 434 * to exclude. 435 * @param offsetMillis the offset from UTC 436 * 437 * @hide used internally by SimpleDateFormat 438 */ createGmtOffsetString(boolean includeGmt, boolean includeMinuteSeparator, int offsetMillis)439 public static String createGmtOffsetString(boolean includeGmt, 440 boolean includeMinuteSeparator, int offsetMillis) { 441 int offsetMinutes = offsetMillis / 60000; 442 char sign = '+'; 443 if (offsetMinutes < 0) { 444 sign = '-'; 445 offsetMinutes = -offsetMinutes; 446 } 447 StringBuilder builder = new StringBuilder(9); 448 if (includeGmt) { 449 builder.append("GMT"); 450 } 451 builder.append(sign); 452 appendNumber(builder, 2, offsetMinutes / 60); 453 if (includeMinuteSeparator) { 454 builder.append(':'); 455 } 456 appendNumber(builder, 2, offsetMinutes % 60); 457 return builder.toString(); 458 } 459 appendNumber(StringBuilder builder, int count, int value)460 private static void appendNumber(StringBuilder builder, int count, int value) { 461 String string = Integer.toString(value); 462 for (int i = 0; i < count - string.length(); i++) { 463 builder.append('0'); 464 } 465 builder.append(string); 466 } 467 // END Android-added: utility method to format an offset as a GMT offset string. 468 469 /** 470 * Returns the amount of time to be added to local standard time 471 * to get local wall clock time. 472 * 473 * <p>The default implementation returns 3600000 milliseconds 474 * (i.e., one hour) if a call to {@link #useDaylightTime()} 475 * returns {@code true}. Otherwise, 0 (zero) is returned. 476 * 477 * <p>If an underlying {@code TimeZone} implementation subclass 478 * supports historical and future Daylight Saving Time schedule 479 * changes, this method returns the amount of saving time of the 480 * last known Daylight Saving Time rule that can be a future 481 * prediction. 482 * 483 * <p>If the amount of saving time at any given time stamp is 484 * required, construct a {@link Calendar} with this {@code 485 * TimeZone} and the time stamp, and call {@link Calendar#get(int) 486 * Calendar.get}{@code (}{@link Calendar#DST_OFFSET}{@code )}. 487 * 488 * @return the amount of saving time in milliseconds 489 * @since 1.4 490 * @see #inDaylightTime(Date) 491 * @see #getOffset(long) 492 * @see #getOffset(int,int,int,int,int,int) 493 * @see Calendar#ZONE_OFFSET 494 */ getDSTSavings()495 public int getDSTSavings() { 496 if (useDaylightTime()) { 497 return 3600000; 498 } 499 return 0; 500 } 501 502 /** 503 * Queries if this {@code TimeZone} uses Daylight Saving Time. 504 * 505 * <p>If an underlying {@code TimeZone} implementation subclass 506 * supports historical and future Daylight Saving Time schedule 507 * changes, this method refers to the last known Daylight Saving Time 508 * rule that can be a future prediction and may not be the same as 509 * the current rule. Consider calling {@link #observesDaylightTime()} 510 * if the current rule should also be taken into account. 511 * 512 * @return {@code true} if this {@code TimeZone} uses Daylight Saving Time, 513 * {@code false}, otherwise. 514 * @see #inDaylightTime(Date) 515 * @see Calendar#DST_OFFSET 516 */ useDaylightTime()517 public abstract boolean useDaylightTime(); 518 519 /** 520 * Returns {@code true} if this {@code TimeZone} is currently in 521 * Daylight Saving Time, or if a transition from Standard Time to 522 * Daylight Saving Time occurs at any future time. 523 * 524 * <p>The default implementation returns {@code true} if 525 * {@code useDaylightTime()} or {@code inDaylightTime(new Date())} 526 * returns {@code true}. 527 * 528 * @return {@code true} if this {@code TimeZone} is currently in 529 * Daylight Saving Time, or if a transition from Standard Time to 530 * Daylight Saving Time occurs at any future time; {@code false} 531 * otherwise. 532 * @since 1.7 533 * @see #useDaylightTime() 534 * @see #inDaylightTime(Date) 535 * @see Calendar#DST_OFFSET 536 */ observesDaylightTime()537 public boolean observesDaylightTime() { 538 return useDaylightTime() || inDaylightTime(new Date()); 539 } 540 541 /** 542 * Queries if the given {@code date} is in Daylight Saving Time in 543 * this time zone. 544 * 545 * @param date the given Date. 546 * @return {@code true} if the given date is in Daylight Saving Time, 547 * {@code false}, otherwise. 548 */ inDaylightTime(Date date)549 abstract public boolean inDaylightTime(Date date); 550 551 /** 552 * Gets the <code>TimeZone</code> for the given ID. 553 * 554 * @param id the ID for a <code>TimeZone</code>, either an abbreviation 555 * such as "PST", a full name such as "America/Los_Angeles", or a custom 556 * ID such as "GMT-8:00". Note that the support of abbreviations is 557 * for JDK 1.1.x compatibility only and full names should be used. 558 * 559 * @return the specified <code>TimeZone</code>, or the GMT zone if the given ID 560 * cannot be understood. 561 */ 562 // Android-changed: param s/ID/id; use ZoneInfoDb instead of ZoneInfo class. getTimeZone(String id)563 public static synchronized TimeZone getTimeZone(String id) { 564 if (id == null) { 565 throw new NullPointerException("id == null"); 566 } 567 568 // Special cases? These can clone an existing instance. 569 if (id.length() == 3) { 570 if (id.equals("GMT")) { 571 return (TimeZone) GMT.clone(); 572 } 573 if (id.equals("UTC")) { 574 return (TimeZone) UTC.clone(); 575 } 576 } 577 578 // In the database? 579 580 ZoneInfoData zoneInfoData = ZoneInfoDb.getInstance().makeZoneInfoData(id); 581 TimeZone zone = zoneInfoData == null ? null : new ZoneInfo(zoneInfoData); 582 583 // Custom time zone? 584 if (zone == null && id.length() > 3 && id.startsWith("GMT")) { 585 zone = getCustomTimeZone(id); 586 } 587 588 // We never return null; on failure we return the equivalent of "GMT". 589 return (zone != null) ? zone : (TimeZone) GMT.clone(); 590 } 591 592 /** 593 * Gets the {@code TimeZone} for the given {@code zoneId}. 594 * 595 * @param zoneId a {@link ZoneId} from which the time zone ID is obtained 596 * @return the specified {@code TimeZone}, or the GMT zone if the given ID 597 * cannot be understood. 598 * @throws NullPointerException if {@code zoneId} is {@code null} 599 * @since 1.8 600 */ getTimeZone(ZoneId zoneId)601 public static TimeZone getTimeZone(ZoneId zoneId) { 602 String tzid = zoneId.getId(); // throws an NPE if null 603 char c = tzid.charAt(0); 604 if (c == '+' || c == '-') { 605 tzid = "GMT" + tzid; 606 } else if (c == 'Z' && tzid.length() == 1) { 607 tzid = "UTC"; 608 } 609 return getTimeZone(tzid); 610 } 611 612 /** 613 * Converts this {@code TimeZone} object to a {@code ZoneId}. 614 * 615 * @return a {@code ZoneId} representing the same time zone as this 616 * {@code TimeZone} 617 * @since 1.8 618 */ toZoneId()619 public ZoneId toZoneId() { 620 // Android-changed: don't support "old mapping" 621 return ZoneId.of(getID(), ZoneId.SHORT_IDS); 622 } 623 624 /** 625 * Returns a new SimpleTimeZone for an ID of the form "GMT[+|-]hh[[:]mm]", or null. 626 */ getCustomTimeZone(String id)627 private static TimeZone getCustomTimeZone(String id) { 628 Matcher m = NoImagePreloadHolder.CUSTOM_ZONE_ID_PATTERN.matcher(id); 629 if (!m.matches()) { 630 return null; 631 } 632 633 int hour; 634 int minute = 0; 635 try { 636 hour = Integer.parseInt(m.group(1)); 637 if (m.group(3) != null) { 638 minute = Integer.parseInt(m.group(3)); 639 } 640 } catch (NumberFormatException impossible) { 641 throw new AssertionError(impossible); 642 } 643 644 if (hour < 0 || hour > 23 || minute < 0 || minute > 59) { 645 return null; 646 } 647 648 char sign = id.charAt(3); 649 int raw = (hour * 3600000) + (minute * 60000); 650 if (sign == '-') { 651 raw = -raw; 652 } 653 654 String cleanId = String.format(Locale.ROOT, "GMT%c%02d:%02d", sign, hour, minute); 655 656 return new SimpleTimeZone(raw, cleanId); 657 } 658 659 /** 660 * Gets the available IDs according to the given time zone offset in milliseconds. 661 * 662 * @param rawOffset the given time zone GMT offset in milliseconds. 663 * @return an array of IDs, where the time zone for that ID has 664 * the specified GMT offset. For example, "America/Phoenix" and "America/Denver" 665 * both have GMT-07:00, but differ in daylight saving behavior. 666 * @see #getRawOffset() 667 */ getAvailableIDs(int rawOffset)668 public static synchronized String[] getAvailableIDs(int rawOffset) { 669 return ZoneInfoDb.getInstance().getAvailableIDs(rawOffset); 670 } 671 672 /** 673 * Gets all the available IDs supported. 674 * @return an array of IDs. 675 */ getAvailableIDs()676 public static synchronized String[] getAvailableIDs() { 677 return ZoneInfoDb.getInstance().getAvailableIDs(); 678 } 679 680 /** 681 * Gets the platform defined TimeZone ID. 682 **/ getSystemTimeZoneID(String javaHome, String country)683 private static native String getSystemTimeZoneID(String javaHome, 684 String country); 685 686 /** 687 * Gets the custom time zone ID based on the GMT offset of the 688 * platform. (e.g., "GMT+08:00") 689 */ getSystemGMTOffsetID()690 private static native String getSystemGMTOffsetID(); 691 692 /** 693 * Gets the default <code>TimeZone</code> for this host. 694 * The source of the default <code>TimeZone</code> 695 * may vary with implementation. 696 * @return a default <code>TimeZone</code>. 697 * @see #setDefault 698 */ getDefault()699 public static TimeZone getDefault() { 700 return (TimeZone) getDefaultRef().clone(); 701 } 702 703 /** 704 * Returns the reference to the default TimeZone object. This 705 * method doesn't create a clone. 706 */ getDefaultRef()707 static synchronized TimeZone getDefaultRef() { 708 if (defaultTimeZone == null) { 709 Supplier<String> tzGetter = RuntimeHooks.getTimeZoneIdSupplier(); 710 String zoneName = (tzGetter != null) ? tzGetter.get() : null; 711 if (zoneName != null) { 712 zoneName = zoneName.trim(); 713 } 714 if (zoneName == null || zoneName.isEmpty()) { 715 try { 716 // On the host, we can find the configured timezone here. 717 zoneName = IoUtils.readFileAsString("/etc/timezone"); 718 } catch (IOException ex) { 719 // "vogar --mode device" can end up here. 720 // TODO: give libcore access to Android system properties and read "persist.sys.timezone". 721 zoneName = "GMT"; 722 } 723 } 724 defaultTimeZone = TimeZone.getTimeZone(zoneName); 725 } 726 return defaultTimeZone; 727 } 728 729 /** 730 * Sets the {@code TimeZone} that is returned by the {@code getDefault} 731 * method. {@code timeZone} is cached. If {@code timeZone} is null, the cached 732 * default {@code TimeZone} is cleared. This method doesn't change the value 733 * of the {@code user.timezone} property. 734 * 735 * @param timeZone the new default {@code TimeZone}, or null 736 * @see #getDefault 737 */ 738 // Android-changed: s/zone/timeZone, synchronized, removed mention of SecurityException setDefault(TimeZone timeZone)739 public synchronized static void setDefault(TimeZone timeZone) 740 { 741 SecurityManager sm = System.getSecurityManager(); 742 if (sm != null) { 743 sm.checkPermission(new PropertyPermission 744 ("user.timezone", "write")); 745 } 746 defaultTimeZone = timeZone != null ? (TimeZone) timeZone.clone() : null; 747 // Android-changed: notify ICU4J of changed default TimeZone. 748 android.icu.util.TimeZone.setICUDefault(null); 749 } 750 751 /** 752 * Returns true if this zone has the same rule and offset as another zone. 753 * That is, if this zone differs only in ID, if at all. Returns false 754 * if the other zone is null. 755 * @param other the <code>TimeZone</code> object to be compared with 756 * @return true if the other zone is not null and is the same as this one, 757 * with the possible exception of the ID 758 * @since 1.2 759 */ hasSameRules(TimeZone other)760 public boolean hasSameRules(TimeZone other) { 761 return other != null && getRawOffset() == other.getRawOffset() && 762 useDaylightTime() == other.useDaylightTime(); 763 } 764 765 /** 766 * Creates a copy of this <code>TimeZone</code>. 767 * 768 * @return a clone of this <code>TimeZone</code> 769 */ clone()770 public Object clone() 771 { 772 try { 773 TimeZone other = (TimeZone) super.clone(); 774 other.ID = ID; 775 return other; 776 } catch (CloneNotSupportedException e) { 777 throw new InternalError(e); 778 } 779 } 780 781 /** 782 * The null constant as a TimeZone. 783 */ 784 static final TimeZone NO_TIMEZONE = null; 785 786 // =======================privates=============================== 787 788 /** 789 * The string identifier of this <code>TimeZone</code>. This is a 790 * programmatic identifier used internally to look up <code>TimeZone</code> 791 * objects from the system table and also to map them to their localized 792 * display names. <code>ID</code> values are unique in the system 793 * table but may not be for dynamically created zones. 794 * @serial 795 */ 796 private String ID; 797 private static volatile TimeZone defaultTimeZone; 798 } 799