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