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 java.io.IOException; 43 import java.io.Serializable; 44 import java.time.ZoneId; 45 import java.util.regex.Matcher; 46 import java.util.regex.Pattern; 47 import java.lang.ref.SoftReference; 48 import java.security.AccessController; 49 import java.security.PrivilegedAction; 50 import java.util.concurrent.ConcurrentHashMap; 51 import libcore.icu.TimeZoneNames; 52 import libcore.io.IoUtils; 53 import libcore.util.ZoneInfoDB; 54 import sun.security.action.GetPropertyAction; 55 import org.apache.harmony.luni.internal.util.TimezoneGetter; 56 57 /** 58 * <code>TimeZone</code> represents a time zone offset, and also figures out daylight 59 * savings. 60 * 61 * <p> 62 * Typically, you get a <code>TimeZone</code> using <code>getDefault</code> 63 * which creates a <code>TimeZone</code> based on the time zone where the program 64 * is running. For example, for a program running in Japan, <code>getDefault</code> 65 * creates a <code>TimeZone</code> object based on Japanese Standard Time. 66 * 67 * <p> 68 * You can also get a <code>TimeZone</code> using <code>getTimeZone</code> 69 * along with a time zone ID. For instance, the time zone ID for the 70 * U.S. Pacific Time zone is "America/Los_Angeles". So, you can get a 71 * U.S. Pacific Time <code>TimeZone</code> object with: 72 * <blockquote><pre> 73 * TimeZone tz = TimeZone.getTimeZone("America/Los_Angeles"); 74 * </pre></blockquote> 75 * You can use the <code>getAvailableIDs</code> method to iterate through 76 * all the supported time zone IDs. You can then choose a 77 * supported ID to get a <code>TimeZone</code>. 78 * If the time zone you want is not represented by one of the 79 * supported IDs, then a custom time zone ID can be specified to 80 * produce a TimeZone. The syntax of a custom time zone ID is: 81 * 82 * <blockquote><pre> 83 * <a name="CustomID"><i>CustomID:</i></a> 84 * <code>GMT</code> <i>Sign</i> <i>Hours</i> <code>:</code> <i>Minutes</i> 85 * <code>GMT</code> <i>Sign</i> <i>Hours</i> <i>Minutes</i> 86 * <code>GMT</code> <i>Sign</i> <i>Hours</i> 87 * <i>Sign:</i> one of 88 * <code>+ -</code> 89 * <i>Hours:</i> 90 * <i>Digit</i> 91 * <i>Digit</i> <i>Digit</i> 92 * <i>Minutes:</i> 93 * <i>Digit</i> <i>Digit</i> 94 * <i>Digit:</i> one of 95 * <code>0 1 2 3 4 5 6 7 8 9</code> 96 * </pre></blockquote> 97 * 98 * <i>Hours</i> must be between 0 to 23 and <i>Minutes</i> must be 99 * between 00 to 59. For example, "GMT+10" and "GMT+0010" mean ten 100 * hours and ten minutes ahead of GMT, respectively. 101 * <p> 102 * The format is locale independent and digits must be taken from the 103 * Basic Latin block of the Unicode standard. No daylight saving time 104 * transition schedule can be specified with a custom time zone ID. If 105 * the specified string doesn't match the syntax, <code>"GMT"</code> 106 * is used. 107 * <p> 108 * When creating a <code>TimeZone</code>, the specified custom time 109 * zone ID is normalized in the following syntax: 110 * <blockquote><pre> 111 * <a name="NormalizedCustomID"><i>NormalizedCustomID:</i></a> 112 * <code>GMT</code> <i>Sign</i> <i>TwoDigitHours</i> <code>:</code> <i>Minutes</i> 113 * <i>Sign:</i> one of 114 * <code>+ -</code> 115 * <i>TwoDigitHours:</i> 116 * <i>Digit</i> <i>Digit</i> 117 * <i>Minutes:</i> 118 * <i>Digit</i> <i>Digit</i> 119 * <i>Digit:</i> one of 120 * <code>0 1 2 3 4 5 6 7 8 9</code> 121 * </pre></blockquote> 122 * For example, TimeZone.getTimeZone("GMT-8").getID() returns "GMT-08:00". 123 * 124 * <h3>Three-letter time zone IDs</h3> 125 * 126 * For compatibility with JDK 1.1.x, some other three-letter time zone IDs 127 * (such as "PST", "CTT", "AST") are also supported. However, <strong>their 128 * use is deprecated</strong> because the same abbreviation is often used 129 * for multiple time zones (for example, "CST" could be U.S. "Central Standard 130 * Time" and "China Standard Time"), and the Java platform can then only 131 * recognize one of them. 132 * 133 * 134 * @see Calendar 135 * @see GregorianCalendar 136 * @see SimpleTimeZone 137 * @author Mark Davis, David Goldsmith, Chen-Lieh Huang, Alan Liu 138 * @since JDK1.1 139 */ 140 abstract public class TimeZone implements Serializable, Cloneable { 141 /** 142 * Sole constructor. (For invocation by subclass constructors, typically 143 * implicit.) 144 */ TimeZone()145 public TimeZone() { 146 } 147 148 /** 149 * A style specifier for <code>getDisplayName()</code> indicating 150 * a short name, such as "PST." 151 * @see #LONG 152 * @since 1.2 153 */ 154 public static final int SHORT = 0; 155 156 /** 157 * A style specifier for <code>getDisplayName()</code> indicating 158 * a long name, such as "Pacific Standard Time." 159 * @see #SHORT 160 * @since 1.2 161 */ 162 public static final int LONG = 1; 163 164 // Android-changed: Use a preload holder to allow compile-time initialization of TimeZone and 165 // dependents. 166 private static class NoImagePreloadHolder { 167 public static final Pattern CUSTOM_ZONE_ID_PATTERN = Pattern.compile("^GMT[-+](\\d{1,2})(:?(\\d\\d))?$"); 168 } 169 170 // Proclaim serialization compatibility with JDK 1.1 171 static final long serialVersionUID = 3581463369166924961L; 172 173 // Android-changed: common timezone instances. 174 private static final TimeZone GMT = new SimpleTimeZone(0, "GMT"); 175 private static final TimeZone UTC = new SimpleTimeZone(0, "UTC"); 176 177 /** 178 * Gets the time zone offset, for current date, modified in case of 179 * daylight savings. This is the offset to add to UTC to get local time. 180 * <p> 181 * This method returns a historically correct offset if an 182 * underlying <code>TimeZone</code> implementation subclass 183 * supports historical Daylight Saving Time schedule and GMT 184 * offset changes. 185 * 186 * @param era the era of the given date. 187 * @param year the year in the given date. 188 * @param month the month in the given date. 189 * Month is 0-based. e.g., 0 for January. 190 * @param day the day-in-month of the given date. 191 * @param dayOfWeek the day-of-week of the given date. 192 * @param milliseconds the milliseconds in day in <em>standard</em> 193 * local time. 194 * 195 * @return the offset in milliseconds to add to GMT to get local time. 196 * 197 * @see Calendar#ZONE_OFFSET 198 * @see Calendar#DST_OFFSET 199 */ getOffset(int era, int year, int month, int day, int dayOfWeek, int milliseconds)200 public abstract int getOffset(int era, int year, int month, int day, 201 int dayOfWeek, int milliseconds); 202 203 /** 204 * Returns the offset of this time zone from UTC at the specified 205 * date. If Daylight Saving Time is in effect at the specified 206 * date, the offset value is adjusted with the amount of daylight 207 * saving. 208 * <p> 209 * This method returns a historically correct offset value if an 210 * underlying TimeZone implementation subclass supports historical 211 * Daylight Saving Time schedule and GMT offset changes. 212 * 213 * @param date the date represented in milliseconds since January 1, 1970 00:00:00 GMT 214 * @return the amount of time in milliseconds to add to UTC to get local time. 215 * 216 * @see Calendar#ZONE_OFFSET 217 * @see Calendar#DST_OFFSET 218 * @since 1.4 219 */ getOffset(long date)220 public int getOffset(long date) { 221 if (inDaylightTime(new Date(date))) { 222 return getRawOffset() + getDSTSavings(); 223 } 224 return getRawOffset(); 225 } 226 227 /** 228 * Gets the raw GMT offset and the amount of daylight saving of this 229 * time zone at the given time. 230 * @param date the milliseconds (since January 1, 1970, 231 * 00:00:00.000 GMT) at which the time zone offset and daylight 232 * saving amount are found 233 * @param offsets an array of int where the raw GMT offset 234 * (offset[0]) and daylight saving amount (offset[1]) are stored, 235 * or null if those values are not needed. The method assumes that 236 * the length of the given array is two or larger. 237 * @return the total amount of the raw GMT offset and daylight 238 * saving at the specified date. 239 * 240 * @see Calendar#ZONE_OFFSET 241 * @see Calendar#DST_OFFSET 242 */ getOffsets(long date, int[] offsets)243 int getOffsets(long date, int[] offsets) { 244 int rawoffset = getRawOffset(); 245 int dstoffset = 0; 246 if (inDaylightTime(new Date(date))) { 247 dstoffset = getDSTSavings(); 248 } 249 if (offsets != null) { 250 offsets[0] = rawoffset; 251 offsets[1] = dstoffset; 252 } 253 return rawoffset + dstoffset; 254 } 255 256 /** 257 * Sets the base time zone offset to GMT. 258 * This is the offset to add to UTC to get local time. 259 * <p> 260 * If an underlying <code>TimeZone</code> implementation subclass 261 * supports historical GMT offset changes, the specified GMT 262 * offset is set as the latest GMT offset and the difference from 263 * the known latest GMT offset value is used to adjust all 264 * historical GMT offset values. 265 * 266 * @param offsetMillis the given base time zone offset to GMT. 267 */ setRawOffset(int offsetMillis)268 abstract public void setRawOffset(int offsetMillis); 269 270 /** 271 * Returns the amount of time in milliseconds to add to UTC to get 272 * standard time in this time zone. Because this value is not 273 * affected by daylight saving time, it is called <I>raw 274 * offset</I>. 275 * <p> 276 * If an underlying <code>TimeZone</code> implementation subclass 277 * supports historical GMT offset changes, the method returns the 278 * raw offset value of the current date. In Honolulu, for example, 279 * its raw offset changed from GMT-10:30 to GMT-10:00 in 1947, and 280 * this method always returns -36000000 milliseconds (i.e., -10 281 * hours). 282 * 283 * @return the amount of raw offset time in milliseconds to add to UTC. 284 * @see Calendar#ZONE_OFFSET 285 */ getRawOffset()286 public abstract int getRawOffset(); 287 288 /** 289 * Gets the ID of this time zone. 290 * @return the ID of this time zone. 291 */ getID()292 public String getID() 293 { 294 return ID; 295 } 296 297 /** 298 * Sets the time zone ID. This does not change any other data in 299 * the time zone object. 300 * @param ID the new time zone ID. 301 */ setID(String ID)302 public void setID(String ID) 303 { 304 if (ID == null) { 305 throw new NullPointerException(); 306 } 307 this.ID = ID; 308 } 309 310 /** 311 * Returns a long standard time name of this {@code TimeZone} suitable for 312 * presentation to the user in the default locale. 313 * 314 * <p>This method is equivalent to: 315 * <blockquote><pre> 316 * getDisplayName(false, {@link #LONG}, 317 * Locale.getDefault({@link Locale.Category#DISPLAY})) 318 * </pre></blockquote> 319 * 320 * @return the human-readable name of this time zone in the default locale. 321 * @since 1.2 322 * @see #getDisplayName(boolean, int, Locale) 323 * @see Locale#getDefault(Locale.Category) 324 * @see Locale.Category 325 */ getDisplayName()326 public final String getDisplayName() { 327 return getDisplayName(false, LONG, 328 Locale.getDefault(Locale.Category.DISPLAY)); 329 } 330 331 /** 332 * Returns a long standard time name of this {@code TimeZone} suitable for 333 * presentation to the user in the specified {@code locale}. 334 * 335 * <p>This method is equivalent to: 336 * <blockquote><pre> 337 * getDisplayName(false, {@link #LONG}, locale) 338 * </pre></blockquote> 339 * 340 * @param locale the locale in which to supply the display name. 341 * @return the human-readable name of this time zone in the given locale. 342 * @exception NullPointerException if {@code locale} is {@code null}. 343 * @since 1.2 344 * @see #getDisplayName(boolean, int, Locale) 345 */ getDisplayName(Locale locale)346 public final String getDisplayName(Locale locale) { 347 return getDisplayName(false, LONG, locale); 348 } 349 350 /** 351 * Returns a name in the specified {@code style} of this {@code TimeZone} 352 * suitable for presentation to the user in the default locale. If the 353 * specified {@code daylight} is {@code true}, a Daylight Saving Time name 354 * is returned (even if this {@code TimeZone} doesn't observe Daylight Saving 355 * Time). Otherwise, a Standard Time name is returned. 356 * 357 * <p>This method is equivalent to: 358 * <blockquote><pre> 359 * getDisplayName(daylight, style, 360 * Locale.getDefault({@link Locale.Category#DISPLAY})) 361 * </pre></blockquote> 362 * 363 * @param daylight {@code true} specifying a Daylight Saving Time name, or 364 * {@code false} specifying a Standard Time name 365 * @param style either {@link #LONG} or {@link #SHORT} 366 * @return the human-readable name of this time zone in the default locale. 367 * @exception IllegalArgumentException if {@code style} is invalid. 368 * @since 1.2 369 * @see #getDisplayName(boolean, int, Locale) 370 * @see Locale#getDefault(Locale.Category) 371 * @see Locale.Category 372 * @see java.text.DateFormatSymbols#getZoneStrings() 373 */ getDisplayName(boolean daylight, int style)374 public final String getDisplayName(boolean daylight, int style) { 375 return getDisplayName(daylight, style, 376 Locale.getDefault(Locale.Category.DISPLAY)); 377 } 378 379 /** 380 * Returns the {@link #SHORT short} or {@link #LONG long} name of this time 381 * zone with either standard or daylight time, as written in {@code locale}. 382 * If the name is not available, the result is in the format 383 * {@code GMT[+-]hh:mm}. 384 * 385 * @param daylightTime true for daylight time, false for standard time. 386 * @param style either {@link TimeZone#LONG} or {@link TimeZone#SHORT}. 387 * @param locale the display locale. 388 */ getDisplayName(boolean daylightTime, int style, Locale locale)389 public String getDisplayName(boolean daylightTime, int style, Locale locale) { 390 if (style != SHORT && style != LONG) { 391 throw new IllegalArgumentException("Illegal style: " + style); 392 } 393 394 // Android-changed: implement using libcore.icu.TimeZoneNames 395 String[][] zoneStrings = TimeZoneNames.getZoneStrings(locale); 396 String result = TimeZoneNames.getDisplayName(zoneStrings, getID(), daylightTime, style); 397 if (result != null) { 398 return result; 399 } 400 401 // If we get here, it's because icu4c has nothing for us. Most commonly, this is in the 402 // case of short names. For Pacific/Fiji, for example, icu4c has nothing better to offer 403 // than "GMT+12:00". Why do we re-do this work ourselves? Because we have up-to-date 404 // time zone transition data, which icu4c _doesn't_ use --- it uses its own baked-in copy, 405 // which only gets updated when we update icu4c. http://b/7955614 and http://b/8026776. 406 407 // TODO: should we generate these once, in TimeZoneNames.getDisplayName? Revisit when we 408 // upgrade to icu4c 50 and rewrite the underlying native code. See also the 409 // "element[j] != null" check in SimpleDateFormat.parseTimeZone, and the extra work in 410 // DateFormatSymbols.getZoneStrings. 411 int offsetMillis = getRawOffset(); 412 if (daylightTime) { 413 offsetMillis += getDSTSavings(); 414 } 415 return createGmtOffsetString(true /* includeGmt */, true /* includeMinuteSeparator */, 416 offsetMillis); 417 } 418 419 /** 420 * Returns a string representation of an offset from UTC. 421 * 422 * <p>The format is "[GMT](+|-)HH[:]MM". The output is not localized. 423 * 424 * @param includeGmt true to include "GMT", false to exclude 425 * @param includeMinuteSeparator true to include the separator between hours and minutes, false 426 * to exclude. 427 * @param offsetMillis the offset from UTC 428 * 429 * @hide used internally by SimpleDateFormat 430 */ createGmtOffsetString(boolean includeGmt, boolean includeMinuteSeparator, int offsetMillis)431 public static String createGmtOffsetString(boolean includeGmt, 432 boolean includeMinuteSeparator, int offsetMillis) { 433 int offsetMinutes = offsetMillis / 60000; 434 char sign = '+'; 435 if (offsetMinutes < 0) { 436 sign = '-'; 437 offsetMinutes = -offsetMinutes; 438 } 439 StringBuilder builder = new StringBuilder(9); 440 if (includeGmt) { 441 builder.append("GMT"); 442 } 443 builder.append(sign); 444 appendNumber(builder, 2, offsetMinutes / 60); 445 if (includeMinuteSeparator) { 446 builder.append(':'); 447 } 448 appendNumber(builder, 2, offsetMinutes % 60); 449 return builder.toString(); 450 } 451 appendNumber(StringBuilder builder, int count, int value)452 private static void appendNumber(StringBuilder builder, int count, int value) { 453 String string = Integer.toString(value); 454 for (int i = 0; i < count - string.length(); i++) { 455 builder.append('0'); 456 } 457 builder.append(string); 458 } 459 460 /** 461 * Returns the amount of time to be added to local standard time 462 * to get local wall clock time. 463 * 464 * <p>The default implementation returns 3600000 milliseconds 465 * (i.e., one hour) if a call to {@link #useDaylightTime()} 466 * returns {@code true}. Otherwise, 0 (zero) is returned. 467 * 468 * <p>If an underlying {@code TimeZone} implementation subclass 469 * supports historical and future Daylight Saving Time schedule 470 * changes, this method returns the amount of saving time of the 471 * last known Daylight Saving Time rule that can be a future 472 * prediction. 473 * 474 * <p>If the amount of saving time at any given time stamp is 475 * required, construct a {@link Calendar} with this {@code 476 * TimeZone} and the time stamp, and call {@link Calendar#get(int) 477 * Calendar.get}{@code (}{@link Calendar#DST_OFFSET}{@code )}. 478 * 479 * @return the amount of saving time in milliseconds 480 * @since 1.4 481 * @see #inDaylightTime(Date) 482 * @see #getOffset(long) 483 * @see #getOffset(int,int,int,int,int,int) 484 * @see Calendar#ZONE_OFFSET 485 */ getDSTSavings()486 public int getDSTSavings() { 487 if (useDaylightTime()) { 488 return 3600000; 489 } 490 return 0; 491 } 492 493 /** 494 * Queries if this {@code TimeZone} uses Daylight Saving Time. 495 * 496 * <p>If an underlying {@code TimeZone} implementation subclass 497 * supports historical and future Daylight Saving Time schedule 498 * changes, this method refers to the last known Daylight Saving Time 499 * rule that can be a future prediction and may not be the same as 500 * the current rule. Consider calling {@link #observesDaylightTime()} 501 * if the current rule should also be taken into account. 502 * 503 * @return {@code true} if this {@code TimeZone} uses Daylight Saving Time, 504 * {@code false}, otherwise. 505 * @see #inDaylightTime(Date) 506 * @see Calendar#DST_OFFSET 507 */ useDaylightTime()508 public abstract boolean useDaylightTime(); 509 510 /** 511 * Returns {@code true} if this {@code TimeZone} is currently in 512 * Daylight Saving Time, or if a transition from Standard Time to 513 * Daylight Saving Time occurs at any future time. 514 * 515 * <p>The default implementation returns {@code true} if 516 * {@code useDaylightTime()} or {@code inDaylightTime(new Date())} 517 * returns {@code true}. 518 * 519 * @return {@code true} if this {@code TimeZone} is currently in 520 * Daylight Saving Time, or if a transition from Standard Time to 521 * Daylight Saving Time occurs at any future time; {@code false} 522 * otherwise. 523 * @since 1.7 524 * @see #useDaylightTime() 525 * @see #inDaylightTime(Date) 526 * @see Calendar#DST_OFFSET 527 */ observesDaylightTime()528 public boolean observesDaylightTime() { 529 return useDaylightTime() || inDaylightTime(new Date()); 530 } 531 532 /** 533 * Queries if the given {@code date} is in Daylight Saving Time in 534 * this time zone. 535 * 536 * @param date the given Date. 537 * @return {@code true} if the given date is in Daylight Saving Time, 538 * {@code false}, otherwise. 539 */ inDaylightTime(Date date)540 abstract public boolean inDaylightTime(Date date); 541 542 /** 543 * Gets the <code>TimeZone</code> for the given ID. 544 * 545 * @param id the ID for a <code>TimeZone</code>, either an abbreviation 546 * such as "PST", a full name such as "America/Los_Angeles", or a custom 547 * ID such as "GMT-8:00". Note that the support of abbreviations is 548 * for JDK 1.1.x compatibility only and full names should be used. 549 * 550 * @return the specified <code>TimeZone</code>, or the GMT zone if the given ID 551 * cannot be understood. 552 */ 553 // Android-changed: param s/ID/id; use ZoneInfoDB instead of ZoneInfo class. getTimeZone(String id)554 public static synchronized TimeZone getTimeZone(String id) { 555 if (id == null) { 556 throw new NullPointerException("id == null"); 557 } 558 559 // Special cases? These can clone an existing instance. 560 if (id.length() == 3) { 561 if (id.equals("GMT")) { 562 return (TimeZone) GMT.clone(); 563 } 564 if (id.equals("UTC")) { 565 return (TimeZone) UTC.clone(); 566 } 567 } 568 569 // In the database? 570 TimeZone zone = null; 571 try { 572 zone = ZoneInfoDB.getInstance().makeTimeZone(id); 573 } catch (IOException ignored) { 574 } 575 576 // Custom time zone? 577 if (zone == null && id.length() > 3 && id.startsWith("GMT")) { 578 zone = getCustomTimeZone(id); 579 } 580 581 // We never return null; on failure we return the equivalent of "GMT". 582 return (zone != null) ? zone : (TimeZone) GMT.clone(); 583 } 584 585 /** 586 * Gets the {@code TimeZone} for the given {@code zoneId}. 587 * 588 * @param zoneId a {@link ZoneId} from which the time zone ID is obtained 589 * @return the specified {@code TimeZone}, or the GMT zone if the given ID 590 * cannot be understood. 591 * @throws NullPointerException if {@code zoneId} is {@code null} 592 * @since 1.8 593 */ getTimeZone(ZoneId zoneId)594 public static TimeZone getTimeZone(ZoneId zoneId) { 595 String tzid = zoneId.getId(); // throws an NPE if null 596 char c = tzid.charAt(0); 597 if (c == '+' || c == '-') { 598 tzid = "GMT" + tzid; 599 } else if (c == 'Z' && tzid.length() == 1) { 600 tzid = "UTC"; 601 } 602 return getTimeZone(tzid); 603 } 604 605 /** 606 * Converts this {@code TimeZone} object to a {@code ZoneId}. 607 * 608 * @return a {@code ZoneId} representing the same time zone as this 609 * {@code TimeZone} 610 * @since 1.8 611 */ toZoneId()612 public ZoneId toZoneId() { 613 // Android-changed: don't support "old mapping" 614 return ZoneId.of(getID(), ZoneId.SHORT_IDS); 615 } 616 617 /** 618 * Returns a new SimpleTimeZone for an ID of the form "GMT[+|-]hh[[:]mm]", or null. 619 */ getCustomTimeZone(String id)620 private static TimeZone getCustomTimeZone(String id) { 621 Matcher m = NoImagePreloadHolder.CUSTOM_ZONE_ID_PATTERN.matcher(id); 622 if (!m.matches()) { 623 return null; 624 } 625 626 int hour; 627 int minute = 0; 628 try { 629 hour = Integer.parseInt(m.group(1)); 630 if (m.group(3) != null) { 631 minute = Integer.parseInt(m.group(3)); 632 } 633 } catch (NumberFormatException impossible) { 634 throw new AssertionError(impossible); 635 } 636 637 if (hour < 0 || hour > 23 || minute < 0 || minute > 59) { 638 return null; 639 } 640 641 char sign = id.charAt(3); 642 int raw = (hour * 3600000) + (minute * 60000); 643 if (sign == '-') { 644 raw = -raw; 645 } 646 647 String cleanId = String.format(Locale.ROOT, "GMT%c%02d:%02d", sign, hour, minute); 648 649 return new SimpleTimeZone(raw, cleanId); 650 } 651 652 /** 653 * Gets the available IDs according to the given time zone offset in milliseconds. 654 * 655 * @param rawOffset the given time zone GMT offset in milliseconds. 656 * @return an array of IDs, where the time zone for that ID has 657 * the specified GMT offset. For example, "America/Phoenix" and "America/Denver" 658 * both have GMT-07:00, but differ in daylight saving behavior. 659 * @see #getRawOffset() 660 */ getAvailableIDs(int rawOffset)661 public static synchronized String[] getAvailableIDs(int rawOffset) { 662 return ZoneInfoDB.getInstance().getAvailableIDs(rawOffset); 663 } 664 665 /** 666 * Gets all the available IDs supported. 667 * @return an array of IDs. 668 */ getAvailableIDs()669 public static synchronized String[] getAvailableIDs() { 670 return ZoneInfoDB.getInstance().getAvailableIDs(); 671 } 672 673 /** 674 * Gets the platform defined TimeZone ID. 675 **/ getSystemTimeZoneID(String javaHome, String country)676 private static native String getSystemTimeZoneID(String javaHome, 677 String country); 678 679 /** 680 * Gets the custom time zone ID based on the GMT offset of the 681 * platform. (e.g., "GMT+08:00") 682 */ getSystemGMTOffsetID()683 private static native String getSystemGMTOffsetID(); 684 685 /** 686 * Gets the default <code>TimeZone</code> for this host. 687 * The source of the default <code>TimeZone</code> 688 * may vary with implementation. 689 * @return a default <code>TimeZone</code>. 690 * @see #setDefault 691 */ getDefault()692 public static TimeZone getDefault() { 693 return (TimeZone) getDefaultRef().clone(); 694 } 695 696 /** 697 * Returns the reference to the default TimeZone object. This 698 * method doesn't create a clone. 699 */ getDefaultRef()700 static synchronized TimeZone getDefaultRef() { 701 if (defaultTimeZone == null) { 702 TimezoneGetter tzGetter = TimezoneGetter.getInstance(); 703 String zoneName = (tzGetter != null) ? tzGetter.getId() : null; 704 if (zoneName != null) { 705 zoneName = zoneName.trim(); 706 } 707 if (zoneName == null || zoneName.isEmpty()) { 708 try { 709 // On the host, we can find the configured timezone here. 710 zoneName = IoUtils.readFileAsString("/etc/timezone"); 711 } catch (IOException ex) { 712 // "vogar --mode device" can end up here. 713 // TODO: give libcore access to Android system properties and read "persist.sys.timezone". 714 zoneName = "GMT"; 715 } 716 } 717 defaultTimeZone = TimeZone.getTimeZone(zoneName); 718 } 719 return defaultTimeZone; 720 } 721 722 /** 723 * Sets the {@code TimeZone} that is returned by the {@code getDefault} 724 * method. {@code timeZone} is cached. If {@code timeZone} is null, the cached 725 * default {@code TimeZone} is cleared. This method doesn't change the value 726 * of the {@code user.timezone} property. 727 * 728 * @param timeZone the new default {@code TimeZone}, or null 729 * @see #getDefault 730 */ 731 // Android-changed: s/zone/timeZone, synchronized, removed mention of SecurityException setDefault(TimeZone timeZone)732 public synchronized static void setDefault(TimeZone timeZone) 733 { 734 SecurityManager sm = System.getSecurityManager(); 735 if (sm != null) { 736 sm.checkPermission(new PropertyPermission 737 ("user.timezone", "write")); 738 } 739 defaultTimeZone = timeZone != null ? (TimeZone) timeZone.clone() : null; 740 // Android-changed: notify ICU4J of changed default TimeZone. 741 android.icu.util.TimeZone.clearCachedDefault(); 742 } 743 744 /** 745 * Returns true if this zone has the same rule and offset as another zone. 746 * That is, if this zone differs only in ID, if at all. Returns false 747 * if the other zone is null. 748 * @param other the <code>TimeZone</code> object to be compared with 749 * @return true if the other zone is not null and is the same as this one, 750 * with the possible exception of the ID 751 * @since 1.2 752 */ hasSameRules(TimeZone other)753 public boolean hasSameRules(TimeZone other) { 754 return other != null && getRawOffset() == other.getRawOffset() && 755 useDaylightTime() == other.useDaylightTime(); 756 } 757 758 /** 759 * Creates a copy of this <code>TimeZone</code>. 760 * 761 * @return a clone of this <code>TimeZone</code> 762 */ clone()763 public Object clone() 764 { 765 try { 766 TimeZone other = (TimeZone) super.clone(); 767 other.ID = ID; 768 return other; 769 } catch (CloneNotSupportedException e) { 770 throw new InternalError(e); 771 } 772 } 773 774 /** 775 * The null constant as a TimeZone. 776 */ 777 static final TimeZone NO_TIMEZONE = null; 778 779 // =======================privates=============================== 780 781 /** 782 * The string identifier of this <code>TimeZone</code>. This is a 783 * programmatic identifier used internally to look up <code>TimeZone</code> 784 * objects from the system table and also to map them to their localized 785 * display names. <code>ID</code> values are unique in the system 786 * table but may not be for dynamically created zones. 787 * @serial 788 */ 789 private String ID; 790 private static volatile TimeZone defaultTimeZone; 791 } 792