1 /* 2 * Copyright (c) 1996, 2019, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 /* 27 * (C) Copyright Taligent, Inc. 1996-1998 - All Rights Reserved 28 * (C) Copyright IBM Corp. 1996-1998 - All Rights Reserved 29 * 30 * The original version of this source code and documentation is copyrighted 31 * and owned by Taligent, Inc., a wholly-owned subsidiary of IBM. These 32 * materials are provided under terms of a License Agreement between Taligent 33 * and Sun. This technology is protected by multiple US and International 34 * patents. This notice and attribution to Taligent may not be removed. 35 * Taligent is a registered trademark of Taligent, Inc. 36 * 37 */ 38 39 package java.util; 40 41 import java.io.IOException; 42 import java.io.ObjectInputStream; 43 import java.time.Instant; 44 import java.time.ZonedDateTime; 45 import java.time.temporal.ChronoField; 46 import sun.util.calendar.BaseCalendar; 47 import sun.util.calendar.CalendarDate; 48 import sun.util.calendar.CalendarSystem; 49 import sun.util.calendar.CalendarUtils; 50 import sun.util.calendar.Era; 51 import sun.util.calendar.Gregorian; 52 import sun.util.calendar.JulianCalendar; 53 import sun.util.calendar.ZoneInfo; 54 55 /** 56 * {@code GregorianCalendar} is a concrete subclass of 57 * {@code Calendar} and provides the standard calendar system 58 * used by most of the world. 59 * 60 * <p> {@code GregorianCalendar} is a hybrid calendar that 61 * supports both the Julian and Gregorian calendar systems with the 62 * support of a single discontinuity, which corresponds by default to 63 * the Gregorian date when the Gregorian calendar was instituted 64 * (October 15, 1582 in some countries, later in others). The cutover 65 * date may be changed by the caller by calling {@link 66 * #setGregorianChange(Date) setGregorianChange()}. 67 * 68 * <p> 69 * Historically, in those countries which adopted the Gregorian calendar first, 70 * October 4, 1582 (Julian) was thus followed by October 15, 1582 (Gregorian). This calendar models 71 * this correctly. Before the Gregorian cutover, {@code GregorianCalendar} 72 * implements the Julian calendar. The only difference between the Gregorian 73 * and the Julian calendar is the leap year rule. The Julian calendar specifies 74 * leap years every four years, whereas the Gregorian calendar omits century 75 * years which are not divisible by 400. 76 * 77 * <p> 78 * {@code GregorianCalendar} implements <em>proleptic</em> Gregorian and 79 * Julian calendars. That is, dates are computed by extrapolating the current 80 * rules indefinitely far backward and forward in time. As a result, 81 * {@code GregorianCalendar} may be used for all years to generate 82 * meaningful and consistent results. However, dates obtained using 83 * {@code GregorianCalendar} are historically accurate only from March 1, 4 84 * AD onward, when modern Julian calendar rules were adopted. Before this date, 85 * leap year rules were applied irregularly, and before 45 BC the Julian 86 * calendar did not even exist. 87 * 88 * <p> 89 * Prior to the institution of the Gregorian calendar, New Year's Day was 90 * March 25. To avoid confusion, this calendar always uses January 1. A manual 91 * adjustment may be made if desired for dates that are prior to the Gregorian 92 * changeover and which fall between January 1 and March 24. 93 * 94 * <h2><a id="week_and_year">Week Of Year and Week Year</a></h2> 95 * 96 * <p>Values calculated for the {@link Calendar#WEEK_OF_YEAR 97 * WEEK_OF_YEAR} field range from 1 to 53. The first week of a 98 * calendar year is the earliest seven day period starting on {@link 99 * Calendar#getFirstDayOfWeek() getFirstDayOfWeek()} that contains at 100 * least {@link Calendar#getMinimalDaysInFirstWeek() 101 * getMinimalDaysInFirstWeek()} days from that year. It thus depends 102 * on the values of {@code getMinimalDaysInFirstWeek()}, {@code 103 * getFirstDayOfWeek()}, and the day of the week of January 1. Weeks 104 * between week 1 of one year and week 1 of the following year 105 * (exclusive) are numbered sequentially from 2 to 52 or 53 (except 106 * for year(s) involved in the Julian-Gregorian transition). 107 * 108 * <p>The {@code getFirstDayOfWeek()} and {@code 109 * getMinimalDaysInFirstWeek()} values are initialized using 110 * locale-dependent resources when constructing a {@code 111 * GregorianCalendar}. <a id="iso8601_compatible_setting">The week 112 * determination is compatible</a> with the ISO 8601 standard when {@code 113 * getFirstDayOfWeek()} is {@code MONDAY} and {@code 114 * getMinimalDaysInFirstWeek()} is 4, which values are used in locales 115 * where the standard is preferred. These values can explicitly be set by 116 * calling {@link Calendar#setFirstDayOfWeek(int) setFirstDayOfWeek()} and 117 * {@link Calendar#setMinimalDaysInFirstWeek(int) 118 * setMinimalDaysInFirstWeek()}. 119 * 120 * <p>A <a id="week_year"><em>week year</em></a> is in sync with a 121 * {@code WEEK_OF_YEAR} cycle. All weeks between the first and last 122 * weeks (inclusive) have the same <em>week year</em> value. 123 * Therefore, the first and last days of a week year may have 124 * different calendar year values. 125 * 126 * <p>For example, January 1, 1998 is a Thursday. If {@code 127 * getFirstDayOfWeek()} is {@code MONDAY} and {@code 128 * getMinimalDaysInFirstWeek()} is 4 (ISO 8601 standard compatible 129 * setting), then week 1 of 1998 starts on December 29, 1997, and ends 130 * on January 4, 1998. The week year is 1998 for the last three days 131 * of calendar year 1997. If, however, {@code getFirstDayOfWeek()} is 132 * {@code SUNDAY}, then week 1 of 1998 starts on January 4, 1998, and 133 * ends on January 10, 1998; the first three days of 1998 then are 134 * part of week 53 of 1997 and their week year is 1997. 135 * 136 * <h3>Week Of Month</h3> 137 * 138 * <p>Values calculated for the {@code WEEK_OF_MONTH} field range from 0 139 * to 6. Week 1 of a month (the days with <code>WEEK_OF_MONTH = 140 * 1</code>) is the earliest set of at least 141 * {@code getMinimalDaysInFirstWeek()} contiguous days in that month, 142 * ending on the day before {@code getFirstDayOfWeek()}. Unlike 143 * week 1 of a year, week 1 of a month may be shorter than 7 days, need 144 * not start on {@code getFirstDayOfWeek()}, and will not include days of 145 * the previous month. Days of a month before week 1 have a 146 * {@code WEEK_OF_MONTH} of 0. 147 * 148 * <p>For example, if {@code getFirstDayOfWeek()} is {@code SUNDAY} 149 * and {@code getMinimalDaysInFirstWeek()} is 4, then the first week of 150 * January 1998 is Sunday, January 4 through Saturday, January 10. These days 151 * have a {@code WEEK_OF_MONTH} of 1. Thursday, January 1 through 152 * Saturday, January 3 have a {@code WEEK_OF_MONTH} of 0. If 153 * {@code getMinimalDaysInFirstWeek()} is changed to 3, then January 1 154 * through January 3 have a {@code WEEK_OF_MONTH} of 1. 155 * 156 * <h3>Default Fields Values</h3> 157 * 158 * <p>The {@code clear} method sets calendar field(s) 159 * undefined. {@code GregorianCalendar} uses the following 160 * default value for each calendar field if its value is undefined. 161 * 162 * <table class="striped" style="text-align: left; width: 66%;"> 163 * <caption style="display:none">GregorianCalendar default field values</caption> 164 * <thead> 165 * <tr> 166 * <th scope="col"> 167 * Field 168 * </th> 169 * <th scope="col"> 170 Default Value 171 * </th> 172 * </tr> 173 * </thead> 174 * <tbody> 175 * <tr> 176 * <th scope="row"> 177 * {@code ERA} 178 * </th> 179 * <td> 180 * {@code AD} 181 * </td> 182 * </tr> 183 * <tr> 184 * <th scope="row"> 185 * {@code YEAR} 186 * </th> 187 * <td> 188 * {@code 1970} 189 * </td> 190 * </tr> 191 * <tr> 192 * <th scope="row"> 193 * {@code MONTH} 194 * </th> 195 * <td> 196 * {@code JANUARY} 197 * </td> 198 * </tr> 199 * <tr> 200 * <th scope="row"> 201 * {@code DAY_OF_MONTH} 202 * </th> 203 * <td> 204 * {@code 1} 205 * </td> 206 * </tr> 207 * <tr> 208 * <th scope="row"> 209 * {@code DAY_OF_WEEK} 210 * </th> 211 * <td> 212 * {@code the first day of week} 213 * </td> 214 * </tr> 215 * <tr> 216 * <th scope="row"> 217 * {@code WEEK_OF_MONTH} 218 * </th> 219 * <td> 220 * {@code 0} 221 * </td> 222 * </tr> 223 * <tr> 224 * <th scope="row"> 225 * {@code DAY_OF_WEEK_IN_MONTH} 226 * </th> 227 * <td> 228 * {@code 1} 229 * </td> 230 * </tr> 231 * <tr> 232 * <th scope="row"> 233 * {@code AM_PM} 234 * </th> 235 * <td> 236 * {@code AM} 237 * </td> 238 * </tr> 239 * <tr> 240 * <th scope="row"> 241 * {@code HOUR, HOUR_OF_DAY, MINUTE, SECOND, MILLISECOND} 242 * </th> 243 * <td> 244 * {@code 0} 245 * </td> 246 * </tr> 247 * </tbody> 248 * </table> 249 * <br>Default values are not applicable for the fields not listed above. 250 * 251 * <p> 252 * <strong>Example:</strong> 253 * <blockquote> 254 * <pre> 255 * // get the supported ids for GMT-08:00 (Pacific Standard Time) 256 * String[] ids = TimeZone.getAvailableIDs(-8 * 60 * 60 * 1000); 257 * // if no ids were returned, something is wrong. get out. 258 * if (ids.length == 0) 259 * System.exit(0); 260 * 261 * // begin output 262 * System.out.println("Current Time"); 263 * 264 * // create a Pacific Standard Time time zone 265 * SimpleTimeZone pdt = new SimpleTimeZone(-8 * 60 * 60 * 1000, ids[0]); 266 * 267 * // set up rules for Daylight Saving Time 268 * pdt.setStartRule(Calendar.APRIL, 1, Calendar.SUNDAY, 2 * 60 * 60 * 1000); 269 * pdt.setEndRule(Calendar.OCTOBER, -1, Calendar.SUNDAY, 2 * 60 * 60 * 1000); 270 * 271 * // create a GregorianCalendar with the Pacific Daylight time zone 272 * // and the current date and time 273 * Calendar calendar = new GregorianCalendar(pdt); 274 * Date trialTime = new Date(); 275 * calendar.setTime(trialTime); 276 * 277 * // print out a bunch of interesting things 278 * System.out.println("ERA: " + calendar.get(Calendar.ERA)); 279 * System.out.println("YEAR: " + calendar.get(Calendar.YEAR)); 280 * System.out.println("MONTH: " + calendar.get(Calendar.MONTH)); 281 * System.out.println("WEEK_OF_YEAR: " + calendar.get(Calendar.WEEK_OF_YEAR)); 282 * System.out.println("WEEK_OF_MONTH: " + calendar.get(Calendar.WEEK_OF_MONTH)); 283 * System.out.println("DATE: " + calendar.get(Calendar.DATE)); 284 * System.out.println("DAY_OF_MONTH: " + calendar.get(Calendar.DAY_OF_MONTH)); 285 * System.out.println("DAY_OF_YEAR: " + calendar.get(Calendar.DAY_OF_YEAR)); 286 * System.out.println("DAY_OF_WEEK: " + calendar.get(Calendar.DAY_OF_WEEK)); 287 * System.out.println("DAY_OF_WEEK_IN_MONTH: " 288 * + calendar.get(Calendar.DAY_OF_WEEK_IN_MONTH)); 289 * System.out.println("AM_PM: " + calendar.get(Calendar.AM_PM)); 290 * System.out.println("HOUR: " + calendar.get(Calendar.HOUR)); 291 * System.out.println("HOUR_OF_DAY: " + calendar.get(Calendar.HOUR_OF_DAY)); 292 * System.out.println("MINUTE: " + calendar.get(Calendar.MINUTE)); 293 * System.out.println("SECOND: " + calendar.get(Calendar.SECOND)); 294 * System.out.println("MILLISECOND: " + calendar.get(Calendar.MILLISECOND)); 295 * System.out.println("ZONE_OFFSET: " 296 * + (calendar.get(Calendar.ZONE_OFFSET)/(60*60*1000))); 297 * System.out.println("DST_OFFSET: " 298 * + (calendar.get(Calendar.DST_OFFSET)/(60*60*1000))); 299 300 * System.out.println("Current Time, with hour reset to 3"); 301 * calendar.clear(Calendar.HOUR_OF_DAY); // so doesn't override 302 * calendar.set(Calendar.HOUR, 3); 303 * System.out.println("ERA: " + calendar.get(Calendar.ERA)); 304 * System.out.println("YEAR: " + calendar.get(Calendar.YEAR)); 305 * System.out.println("MONTH: " + calendar.get(Calendar.MONTH)); 306 * System.out.println("WEEK_OF_YEAR: " + calendar.get(Calendar.WEEK_OF_YEAR)); 307 * System.out.println("WEEK_OF_MONTH: " + calendar.get(Calendar.WEEK_OF_MONTH)); 308 * System.out.println("DATE: " + calendar.get(Calendar.DATE)); 309 * System.out.println("DAY_OF_MONTH: " + calendar.get(Calendar.DAY_OF_MONTH)); 310 * System.out.println("DAY_OF_YEAR: " + calendar.get(Calendar.DAY_OF_YEAR)); 311 * System.out.println("DAY_OF_WEEK: " + calendar.get(Calendar.DAY_OF_WEEK)); 312 * System.out.println("DAY_OF_WEEK_IN_MONTH: " 313 * + calendar.get(Calendar.DAY_OF_WEEK_IN_MONTH)); 314 * System.out.println("AM_PM: " + calendar.get(Calendar.AM_PM)); 315 * System.out.println("HOUR: " + calendar.get(Calendar.HOUR)); 316 * System.out.println("HOUR_OF_DAY: " + calendar.get(Calendar.HOUR_OF_DAY)); 317 * System.out.println("MINUTE: " + calendar.get(Calendar.MINUTE)); 318 * System.out.println("SECOND: " + calendar.get(Calendar.SECOND)); 319 * System.out.println("MILLISECOND: " + calendar.get(Calendar.MILLISECOND)); 320 * System.out.println("ZONE_OFFSET: " 321 * + (calendar.get(Calendar.ZONE_OFFSET)/(60*60*1000))); // in hours 322 * System.out.println("DST_OFFSET: " 323 * + (calendar.get(Calendar.DST_OFFSET)/(60*60*1000))); // in hours 324 * </pre> 325 * </blockquote> 326 * 327 * @see TimeZone 328 * @author David Goldsmith, Mark Davis, Chen-Lieh Huang, Alan Liu 329 * @since 1.1 330 */ 331 public class GregorianCalendar extends Calendar { 332 /* 333 * Implementation Notes 334 * 335 * The epoch is the number of days or milliseconds from some defined 336 * starting point. The epoch for java.util.Date is used here; that is, 337 * milliseconds from January 1, 1970 (Gregorian), midnight UTC. Other 338 * epochs which are used are January 1, year 1 (Gregorian), which is day 1 339 * of the Gregorian calendar, and December 30, year 0 (Gregorian), which is 340 * day 1 of the Julian calendar. 341 * 342 * We implement the proleptic Julian and Gregorian calendars. This means we 343 * implement the modern definition of the calendar even though the 344 * historical usage differs. For example, if the Gregorian change is set 345 * to new Date(Long.MIN_VALUE), we have a pure Gregorian calendar which 346 * labels dates preceding the invention of the Gregorian calendar in 1582 as 347 * if the calendar existed then. 348 * 349 * Likewise, with the Julian calendar, we assume a consistent 350 * 4-year leap year rule, even though the historical pattern of 351 * leap years is irregular, being every 3 years from 45 BCE 352 * through 9 BCE, then every 4 years from 8 CE onwards, with no 353 * leap years in-between. Thus date computations and functions 354 * such as isLeapYear() are not intended to be historically 355 * accurate. 356 */ 357 358 ////////////////// 359 // Class Variables 360 ////////////////// 361 362 /** 363 * Value of the {@code ERA} field indicating 364 * the period before the common era (before Christ), also known as BCE. 365 * The sequence of years at the transition from {@code BC} to {@code AD} is 366 * ..., 2 BC, 1 BC, 1 AD, 2 AD,... 367 * 368 * @see #ERA 369 */ 370 public static final int BC = 0; 371 372 /** 373 * Value of the {@link #ERA} field indicating 374 * the period before the common era, the same value as {@link #BC}. 375 * 376 * @see #CE 377 */ 378 static final int BCE = 0; 379 380 /** 381 * Value of the {@code ERA} field indicating 382 * the common era (Anno Domini), also known as CE. 383 * The sequence of years at the transition from {@code BC} to {@code AD} is 384 * ..., 2 BC, 1 BC, 1 AD, 2 AD,... 385 * 386 * @see #ERA 387 */ 388 public static final int AD = 1; 389 390 /** 391 * Value of the {@link #ERA} field indicating 392 * the common era, the same value as {@link #AD}. 393 * 394 * @see #BCE 395 */ 396 static final int CE = 1; 397 398 private static final int EPOCH_OFFSET = 719163; // Fixed date of January 1, 1970 (Gregorian) 399 private static final int EPOCH_YEAR = 1970; 400 401 static final int MONTH_LENGTH[] 402 = {31,28,31,30,31,30,31,31,30,31,30,31}; // 0-based 403 static final int LEAP_MONTH_LENGTH[] 404 = {31,29,31,30,31,30,31,31,30,31,30,31}; // 0-based 405 406 // Useful millisecond constants. Although ONE_DAY and ONE_WEEK can fit 407 // into ints, they must be longs in order to prevent arithmetic overflow 408 // when performing (bug 4173516). 409 private static final int ONE_SECOND = 1000; 410 private static final int ONE_MINUTE = 60*ONE_SECOND; 411 private static final int ONE_HOUR = 60*ONE_MINUTE; 412 private static final long ONE_DAY = 24*ONE_HOUR; 413 private static final long ONE_WEEK = 7*ONE_DAY; 414 415 /* 416 * <pre> 417 * Greatest Least 418 * Field name Minimum Minimum Maximum Maximum 419 * ---------- ------- ------- ------- ------- 420 * ERA 0 0 1 1 421 * YEAR 1 1 292269054 292278994 422 * MONTH 0 0 11 11 423 * WEEK_OF_YEAR 1 1 52* 53 424 * WEEK_OF_MONTH 0 0 4* 6 425 * DAY_OF_MONTH 1 1 28* 31 426 * DAY_OF_YEAR 1 1 365* 366 427 * DAY_OF_WEEK 1 1 7 7 428 * DAY_OF_WEEK_IN_MONTH 1 1 4* 6 429 * AM_PM 0 0 1 1 430 * HOUR 0 0 11 11 431 * HOUR_OF_DAY 0 0 23 23 432 * MINUTE 0 0 59 59 433 * SECOND 0 0 59 59 434 * MILLISECOND 0 0 999 999 435 * ZONE_OFFSET -13:00 -13:00 14:00 14:00 436 * DST_OFFSET 0:00 0:00 0:20 2:00 437 * </pre> 438 * *: depends on the Gregorian change date 439 */ 440 static final int MIN_VALUES[] = { 441 BCE, // ERA 442 1, // YEAR 443 JANUARY, // MONTH 444 1, // WEEK_OF_YEAR 445 0, // WEEK_OF_MONTH 446 1, // DAY_OF_MONTH 447 1, // DAY_OF_YEAR 448 SUNDAY, // DAY_OF_WEEK 449 1, // DAY_OF_WEEK_IN_MONTH 450 AM, // AM_PM 451 0, // HOUR 452 0, // HOUR_OF_DAY 453 0, // MINUTE 454 0, // SECOND 455 0, // MILLISECOND 456 -13*ONE_HOUR, // ZONE_OFFSET (UNIX compatibility) 457 0 // DST_OFFSET 458 }; 459 static final int LEAST_MAX_VALUES[] = { 460 CE, // ERA 461 292269054, // YEAR 462 DECEMBER, // MONTH 463 52, // WEEK_OF_YEAR 464 4, // WEEK_OF_MONTH 465 28, // DAY_OF_MONTH 466 365, // DAY_OF_YEAR 467 SATURDAY, // DAY_OF_WEEK 468 4, // DAY_OF_WEEK_IN 469 PM, // AM_PM 470 11, // HOUR 471 23, // HOUR_OF_DAY 472 59, // MINUTE 473 59, // SECOND 474 999, // MILLISECOND 475 14*ONE_HOUR, // ZONE_OFFSET 476 20*ONE_MINUTE // DST_OFFSET (historical least maximum) 477 }; 478 static final int MAX_VALUES[] = { 479 CE, // ERA 480 292278994, // YEAR 481 DECEMBER, // MONTH 482 53, // WEEK_OF_YEAR 483 6, // WEEK_OF_MONTH 484 31, // DAY_OF_MONTH 485 366, // DAY_OF_YEAR 486 SATURDAY, // DAY_OF_WEEK 487 6, // DAY_OF_WEEK_IN 488 PM, // AM_PM 489 11, // HOUR 490 23, // HOUR_OF_DAY 491 59, // MINUTE 492 59, // SECOND 493 999, // MILLISECOND 494 14*ONE_HOUR, // ZONE_OFFSET 495 2*ONE_HOUR // DST_OFFSET (double summer time) 496 }; 497 498 // Proclaim serialization compatibility with JDK 1.1 499 @SuppressWarnings("FieldNameHidesFieldInSuperclass") 500 @java.io.Serial 501 static final long serialVersionUID = -8125100834729963327L; 502 503 // Reference to the sun.util.calendar.Gregorian instance (singleton). 504 private static final Gregorian gcal = 505 CalendarSystem.getGregorianCalendar(); 506 507 // Reference to the JulianCalendar instance (singleton), set as needed. See 508 // getJulianCalendarSystem(). 509 private static JulianCalendar jcal; 510 511 // JulianCalendar eras. See getJulianCalendarSystem(). 512 private static Era[] jeras; 513 514 // The default value of gregorianCutover. 515 static final long DEFAULT_GREGORIAN_CUTOVER = -12219292800000L; 516 517 ///////////////////// 518 // Instance Variables 519 ///////////////////// 520 521 /** 522 * The point at which the Gregorian calendar rules are used, measured in 523 * milliseconds from the standard epoch. Default is October 15, 1582 524 * (Gregorian) 00:00:00 UTC or -12219292800000L. For this value, October 4, 525 * 1582 (Julian) is followed by October 15, 1582 (Gregorian). This 526 * corresponds to Julian day number 2299161. 527 * @serial 528 */ 529 private long gregorianCutover = DEFAULT_GREGORIAN_CUTOVER; 530 531 /** 532 * The fixed date of the gregorianCutover. 533 */ 534 private transient long gregorianCutoverDate = 535 (((DEFAULT_GREGORIAN_CUTOVER + 1)/ONE_DAY) - 1) + EPOCH_OFFSET; // == 577736 536 537 /** 538 * The normalized year of the gregorianCutover in Gregorian, with 539 * 0 representing 1 BCE, -1 representing 2 BCE, etc. 540 */ 541 private transient int gregorianCutoverYear = 1582; 542 543 /** 544 * The normalized year of the gregorianCutover in Julian, with 0 545 * representing 1 BCE, -1 representing 2 BCE, etc. 546 */ 547 private transient int gregorianCutoverYearJulian = 1582; 548 549 /** 550 * gdate always has a sun.util.calendar.Gregorian.Date instance to 551 * avoid overhead of creating it. The assumption is that most 552 * applications will need only Gregorian calendar calculations. 553 */ 554 private transient BaseCalendar.Date gdate; 555 556 /** 557 * Reference to either gdate or a JulianCalendar.Date 558 * instance. After calling complete(), this value is guaranteed to 559 * be set. 560 */ 561 private transient BaseCalendar.Date cdate; 562 563 /** 564 * The CalendarSystem used to calculate the date in cdate. After 565 * calling complete(), this value is guaranteed to be set and 566 * consistent with the cdate value. 567 */ 568 private transient BaseCalendar calsys; 569 570 /** 571 * Temporary int[2] to get time zone offsets. zoneOffsets[0] gets 572 * the GMT offset value and zoneOffsets[1] gets the DST saving 573 * value. 574 */ 575 private transient int[] zoneOffsets; 576 577 /** 578 * Temporary storage for saving original fields[] values in 579 * non-lenient mode. 580 */ 581 private transient int[] originalFields; 582 583 /////////////// 584 // Constructors 585 /////////////// 586 587 /** 588 * Constructs a default {@code GregorianCalendar} using the current time 589 * in the default time zone with the default 590 * {@link Locale.Category#FORMAT FORMAT} locale. 591 */ 592 public GregorianCalendar() { 593 this(TimeZone.getDefaultRef(), Locale.getDefault(Locale.Category.FORMAT)); 594 setZoneShared(true); 595 } 596 597 /** 598 * Constructs a {@code GregorianCalendar} based on the current time 599 * in the given time zone with the default 600 * {@link Locale.Category#FORMAT FORMAT} locale. 601 * 602 * @param zone the given time zone. 603 */ 604 public GregorianCalendar(TimeZone zone) { 605 this(zone, Locale.getDefault(Locale.Category.FORMAT)); 606 } 607 608 /** 609 * Constructs a {@code GregorianCalendar} based on the current time 610 * in the default time zone with the given locale. 611 * 612 * @param aLocale the given locale. 613 */ 614 public GregorianCalendar(Locale aLocale) { 615 this(TimeZone.getDefaultRef(), aLocale); 616 setZoneShared(true); 617 } 618 619 /** 620 * Constructs a {@code GregorianCalendar} based on the current time 621 * in the given time zone with the given locale. 622 * 623 * @param zone the given time zone. 624 * @param aLocale the given locale. 625 */ 626 public GregorianCalendar(TimeZone zone, Locale aLocale) { 627 super(zone, aLocale); 628 gdate = (BaseCalendar.Date) gcal.newCalendarDate(zone); 629 setTimeInMillis(System.currentTimeMillis()); 630 } 631 632 /** 633 * Constructs a {@code GregorianCalendar} with the given date set 634 * in the default time zone with the default locale. 635 * 636 * @param year the value used to set the {@code YEAR} calendar field in the calendar. 637 * @param month the value used to set the {@code MONTH} calendar field in the calendar. 638 * Month value is 0-based. e.g., 0 for January. 639 * @param dayOfMonth the value used to set the {@code DAY_OF_MONTH} calendar field in the calendar. 640 */ 641 public GregorianCalendar(int year, int month, int dayOfMonth) { 642 this(year, month, dayOfMonth, 0, 0, 0, 0); 643 } 644 645 /** 646 * Constructs a {@code GregorianCalendar} with the given date 647 * and time set for the default time zone with the default locale. 648 * 649 * @param year the value used to set the {@code YEAR} calendar field in the calendar. 650 * @param month the value used to set the {@code MONTH} calendar field in the calendar. 651 * Month value is 0-based. e.g., 0 for January. 652 * @param dayOfMonth the value used to set the {@code DAY_OF_MONTH} calendar field in the calendar. 653 * @param hourOfDay the value used to set the {@code HOUR_OF_DAY} calendar field 654 * in the calendar. 655 * @param minute the value used to set the {@code MINUTE} calendar field 656 * in the calendar. 657 */ 658 public GregorianCalendar(int year, int month, int dayOfMonth, int hourOfDay, 659 int minute) { 660 this(year, month, dayOfMonth, hourOfDay, minute, 0, 0); 661 } 662 663 /** 664 * Constructs a GregorianCalendar with the given date 665 * and time set for the default time zone with the default locale. 666 * 667 * @param year the value used to set the {@code YEAR} calendar field in the calendar. 668 * @param month the value used to set the {@code MONTH} calendar field in the calendar. 669 * Month value is 0-based. e.g., 0 for January. 670 * @param dayOfMonth the value used to set the {@code DAY_OF_MONTH} calendar field in the calendar. 671 * @param hourOfDay the value used to set the {@code HOUR_OF_DAY} calendar field 672 * in the calendar. 673 * @param minute the value used to set the {@code MINUTE} calendar field 674 * in the calendar. 675 * @param second the value used to set the {@code SECOND} calendar field 676 * in the calendar. 677 */ 678 public GregorianCalendar(int year, int month, int dayOfMonth, int hourOfDay, 679 int minute, int second) { 680 this(year, month, dayOfMonth, hourOfDay, minute, second, 0); 681 } 682 683 /** 684 * Constructs a {@code GregorianCalendar} with the given date 685 * and time set for the default time zone with the default locale. 686 * 687 * @param year the value used to set the {@code YEAR} calendar field in the calendar. 688 * @param month the value used to set the {@code MONTH} calendar field in the calendar. 689 * Month value is 0-based. e.g., 0 for January. 690 * @param dayOfMonth the value used to set the {@code DAY_OF_MONTH} calendar field in the calendar. 691 * @param hourOfDay the value used to set the {@code HOUR_OF_DAY} calendar field 692 * in the calendar. 693 * @param minute the value used to set the {@code MINUTE} calendar field 694 * in the calendar. 695 * @param second the value used to set the {@code SECOND} calendar field 696 * in the calendar. 697 * @param millis the value used to set the {@code MILLISECOND} calendar field 698 */ 699 GregorianCalendar(int year, int month, int dayOfMonth, 700 int hourOfDay, int minute, int second, int millis) { 701 super(); 702 gdate = (BaseCalendar.Date) gcal.newCalendarDate(getZone()); 703 this.set(YEAR, year); 704 this.set(MONTH, month); 705 this.set(DAY_OF_MONTH, dayOfMonth); 706 707 // Set AM_PM and HOUR here to set their stamp values before 708 // setting HOUR_OF_DAY (6178071). 709 if (hourOfDay >= 12 && hourOfDay <= 23) { 710 // If hourOfDay is a valid PM hour, set the correct PM values 711 // so that it won't throw an exception in case it's set to 712 // non-lenient later. 713 this.internalSet(AM_PM, PM); 714 this.internalSet(HOUR, hourOfDay - 12); 715 } else { 716 // The default value for AM_PM is AM. 717 // We don't care any out of range value here for leniency. 718 this.internalSet(HOUR, hourOfDay); 719 } 720 // The stamp values of AM_PM and HOUR must be COMPUTED. (6440854) 721 setFieldsComputed(HOUR_MASK|AM_PM_MASK); 722 723 this.set(HOUR_OF_DAY, hourOfDay); 724 this.set(MINUTE, minute); 725 this.set(SECOND, second); 726 // should be changed to set() when this constructor is made 727 // public. 728 this.internalSet(MILLISECOND, millis); 729 } 730 731 /** 732 * Constructs an empty GregorianCalendar. 733 * 734 * @param zone the given time zone 735 * @param aLocale the given locale 736 * @param flag the flag requesting an empty instance 737 */ 738 GregorianCalendar(TimeZone zone, Locale locale, boolean flag) { 739 super(zone, locale); 740 gdate = (BaseCalendar.Date) gcal.newCalendarDate(getZone()); 741 } 742 743 ///////////////// 744 // Public methods 745 ///////////////// 746 747 /** 748 * Sets the {@code GregorianCalendar} change date. This is the point when the switch 749 * from Julian dates to Gregorian dates occurred. Default is October 15, 750 * 1582 (Gregorian). Previous to this, dates will be in the Julian calendar. 751 * <p> 752 * To obtain a pure Julian calendar, set the change date to 753 * {@code Date(Long.MAX_VALUE)}. To obtain a pure Gregorian calendar, 754 * set the change date to {@code Date(Long.MIN_VALUE)}. 755 * 756 * @param date the given Gregorian cutover date. 757 */ 758 public void setGregorianChange(Date date) { 759 long cutoverTime = date.getTime(); 760 if (cutoverTime == gregorianCutover) { 761 return; 762 } 763 // Before changing the cutover date, make sure to have the 764 // time of this calendar. 765 complete(); 766 setGregorianChange(cutoverTime); 767 } 768 769 private void setGregorianChange(long cutoverTime) { 770 gregorianCutover = cutoverTime; 771 gregorianCutoverDate = CalendarUtils.floorDivide(cutoverTime, ONE_DAY) 772 + EPOCH_OFFSET; 773 774 // To provide the "pure" Julian calendar as advertised. 775 // Strictly speaking, the last millisecond should be a 776 // Gregorian date. However, the API doc specifies that setting 777 // the cutover date to Long.MAX_VALUE will make this calendar 778 // a pure Julian calendar. (See 4167995) 779 if (cutoverTime == Long.MAX_VALUE) { 780 gregorianCutoverDate++; 781 } 782 783 BaseCalendar.Date d = getGregorianCutoverDate(); 784 785 // Set the cutover year (in the Gregorian year numbering) 786 gregorianCutoverYear = d.getYear(); 787 788 BaseCalendar julianCal = getJulianCalendarSystem(); 789 d = (BaseCalendar.Date) julianCal.newCalendarDate(TimeZone.NO_TIMEZONE); 790 julianCal.getCalendarDateFromFixedDate(d, gregorianCutoverDate - 1); 791 gregorianCutoverYearJulian = d.getNormalizedYear(); 792 793 if (time < gregorianCutover) { 794 // The field values are no longer valid under the new 795 // cutover date. 796 setUnnormalized(); 797 } 798 } 799 800 /** 801 * Gets the Gregorian Calendar change date. This is the point when the 802 * switch from Julian dates to Gregorian dates occurred. Default is 803 * October 15, 1582 (Gregorian). Previous to this, dates will be in the Julian 804 * calendar. 805 * 806 * @return the Gregorian cutover date for this {@code GregorianCalendar} object. 807 */ 808 public final Date getGregorianChange() { 809 return new Date(gregorianCutover); 810 } 811 812 /** 813 * Determines if the given year is a leap year. Returns {@code true} if 814 * the given year is a leap year. To specify BC year numbers, 815 * {@code 1 - year number} must be given. For example, year BC 4 is 816 * specified as -3. 817 * 818 * @param year the given year. 819 * @return {@code true} if the given year is a leap year; {@code false} otherwise. 820 */ 821 public boolean isLeapYear(int year) { 822 if ((year & 3) != 0) { 823 return false; 824 } 825 826 if (year > gregorianCutoverYear) { 827 return (year%100 != 0) || (year%400 == 0); // Gregorian 828 } 829 if (year < gregorianCutoverYearJulian) { 830 return true; // Julian 831 } 832 boolean gregorian; 833 // If the given year is the Gregorian cutover year, we need to 834 // determine which calendar system to be applied to February in the year. 835 if (gregorianCutoverYear == gregorianCutoverYearJulian) { 836 BaseCalendar.Date d = getCalendarDate(gregorianCutoverDate); // Gregorian 837 gregorian = d.getMonth() < BaseCalendar.MARCH; 838 } else { 839 gregorian = year == gregorianCutoverYear; 840 } 841 return gregorian ? (year%100 != 0) || (year%400 == 0) : true; 842 } 843 844 /** 845 * Returns {@code "gregory"} as the calendar type. 846 * 847 * @return {@code "gregory"} 848 * @since 1.8 849 */ 850 @Override 851 public String getCalendarType() { 852 return "gregory"; 853 } 854 855 /** 856 * Compares this {@code GregorianCalendar} to the specified 857 * {@code Object}. The result is {@code true} if and 858 * only if the argument is a {@code GregorianCalendar} object 859 * that represents the same time value (millisecond offset from 860 * the <a href="Calendar.html#Epoch">Epoch</a>) under the same 861 * {@code Calendar} parameters and Gregorian change date as 862 * this object. 863 * 864 * @param obj the object to compare with. 865 * @return {@code true} if this object is equal to {@code obj}; 866 * {@code false} otherwise. 867 * @see Calendar#compareTo(Calendar) 868 */ 869 @Override 870 public boolean equals(Object obj) { 871 return obj instanceof GregorianCalendar && 872 super.equals(obj) && 873 gregorianCutover == ((GregorianCalendar)obj).gregorianCutover; 874 } 875 876 /** 877 * Generates the hash code for this {@code GregorianCalendar} object. 878 */ 879 @Override 880 public int hashCode() { 881 return super.hashCode() ^ (int)gregorianCutoverDate; 882 } 883 884 /** 885 * Adds the specified (signed) amount of time to the given calendar field, 886 * based on the calendar's rules. 887 * 888 * <p><em>Add rule 1</em>. The value of {@code field} 889 * after the call minus the value of {@code field} before the 890 * call is {@code amount}, modulo any overflow that has occurred in 891 * {@code field}. Overflow occurs when a field value exceeds its 892 * range and, as a result, the next larger field is incremented or 893 * decremented and the field value is adjusted back into its range.</p> 894 * 895 * <p><em>Add rule 2</em>. If a smaller field is expected to be 896 * invariant, but it is impossible for it to be equal to its 897 * prior value because of changes in its minimum or maximum after 898 * {@code field} is changed, then its value is adjusted to be as close 899 * as possible to its expected value. A smaller field represents a 900 * smaller unit of time. {@code HOUR} is a smaller field than 901 * {@code DAY_OF_MONTH}. No adjustment is made to smaller fields 902 * that are not expected to be invariant. The calendar system 903 * determines what fields are expected to be invariant.</p> 904 * 905 * @param field the calendar field. 906 * @param amount the amount of date or time to be added to the field. 907 * @throws IllegalArgumentException if {@code field} is 908 * {@code ZONE_OFFSET}, {@code DST_OFFSET}, or unknown, 909 * or if any calendar fields have out-of-range values in 910 * non-lenient mode. 911 */ 912 @Override 913 public void add(int field, int amount) { 914 // If amount == 0, do nothing even the given field is out of 915 // range. This is tested by JCK. 916 if (amount == 0) { 917 return; // Do nothing! 918 } 919 920 if (field < 0 || field >= ZONE_OFFSET) { 921 throw new IllegalArgumentException(); 922 } 923 924 // Sync the time and calendar fields. 925 complete(); 926 927 if (field == YEAR) { 928 int year = internalGet(YEAR); 929 if (internalGetEra() == CE) { 930 year += amount; 931 if (year > 0) { 932 set(YEAR, year); 933 } else { // year <= 0 934 set(YEAR, 1 - year); 935 // if year == 0, you get 1 BCE. 936 set(ERA, BCE); 937 } 938 } 939 else { // era == BCE 940 year -= amount; 941 if (year > 0) { 942 set(YEAR, year); 943 } else { // year <= 0 944 set(YEAR, 1 - year); 945 // if year == 0, you get 1 CE 946 set(ERA, CE); 947 } 948 } 949 pinDayOfMonth(); 950 } else if (field == MONTH) { 951 int month = internalGet(MONTH) + amount; 952 int year = internalGet(YEAR); 953 int y_amount; 954 955 if (month >= 0) { 956 y_amount = month/12; 957 } else { 958 y_amount = (month+1)/12 - 1; 959 } 960 if (y_amount != 0) { 961 if (internalGetEra() == CE) { 962 year += y_amount; 963 if (year > 0) { 964 set(YEAR, year); 965 } else { // year <= 0 966 set(YEAR, 1 - year); 967 // if year == 0, you get 1 BCE 968 set(ERA, BCE); 969 } 970 } 971 else { // era == BCE 972 year -= y_amount; 973 if (year > 0) { 974 set(YEAR, year); 975 } else { // year <= 0 976 set(YEAR, 1 - year); 977 // if year == 0, you get 1 CE 978 set(ERA, CE); 979 } 980 } 981 } 982 983 if (month >= 0) { 984 set(MONTH, month % 12); 985 } else { 986 // month < 0 987 month %= 12; 988 if (month < 0) { 989 month += 12; 990 } 991 set(MONTH, JANUARY + month); 992 } 993 pinDayOfMonth(); 994 } else if (field == ERA) { 995 int era = internalGet(ERA) + amount; 996 if (era < 0) { 997 era = 0; 998 } 999 if (era > 1) { 1000 era = 1; 1001 } 1002 set(ERA, era); 1003 } else { 1004 long delta = amount; 1005 long timeOfDay = 0; 1006 switch (field) { 1007 // Handle the time fields here. Convert the given 1008 // amount to milliseconds and call setTimeInMillis. 1009 case HOUR: 1010 case HOUR_OF_DAY: 1011 delta *= 60 * 60 * 1000; // hours to minutes 1012 break; 1013 1014 case MINUTE: 1015 delta *= 60 * 1000; // minutes to seconds 1016 break; 1017 1018 case SECOND: 1019 delta *= 1000; // seconds to milliseconds 1020 break; 1021 1022 case MILLISECOND: 1023 break; 1024 1025 // Handle week, day and AM_PM fields which involves 1026 // time zone offset change adjustment. Convert the 1027 // given amount to the number of days. 1028 case WEEK_OF_YEAR: 1029 case WEEK_OF_MONTH: 1030 case DAY_OF_WEEK_IN_MONTH: 1031 delta *= 7; 1032 break; 1033 1034 case DAY_OF_MONTH: // synonym of DATE 1035 case DAY_OF_YEAR: 1036 case DAY_OF_WEEK: 1037 break; 1038 1039 case AM_PM: 1040 // Convert the amount to the number of days (delta) 1041 // and +12 or -12 hours (timeOfDay). 1042 delta = amount / 2; 1043 timeOfDay = 12 * (amount % 2); 1044 break; 1045 } 1046 1047 // The time fields don't require time zone offset change 1048 // adjustment. 1049 if (field >= HOUR) { 1050 setTimeInMillis(time + delta); 1051 return; 1052 } 1053 1054 // The rest of the fields (week, day or AM_PM fields) 1055 // require time zone offset (both GMT and DST) change 1056 // adjustment. 1057 1058 // Translate the current time to the fixed date and time 1059 // of the day. 1060 long fd = getCurrentFixedDate(); 1061 timeOfDay += internalGet(HOUR_OF_DAY); 1062 timeOfDay *= 60; 1063 timeOfDay += internalGet(MINUTE); 1064 timeOfDay *= 60; 1065 timeOfDay += internalGet(SECOND); 1066 timeOfDay *= 1000; 1067 timeOfDay += internalGet(MILLISECOND); 1068 if (timeOfDay >= ONE_DAY) { 1069 fd++; 1070 timeOfDay -= ONE_DAY; 1071 } else if (timeOfDay < 0) { 1072 fd--; 1073 timeOfDay += ONE_DAY; 1074 } 1075 1076 fd += delta; // fd is the expected fixed date after the calculation 1077 int zoneOffset = internalGet(ZONE_OFFSET) + internalGet(DST_OFFSET); 1078 setTimeInMillis((fd - EPOCH_OFFSET) * ONE_DAY + timeOfDay - zoneOffset); 1079 zoneOffset -= internalGet(ZONE_OFFSET) + internalGet(DST_OFFSET); 1080 // If the time zone offset has changed, then adjust the difference. 1081 if (zoneOffset != 0) { 1082 setTimeInMillis(time + zoneOffset); 1083 long fd2 = getCurrentFixedDate(); 1084 // If the adjustment has changed the date, then take 1085 // the previous one. 1086 if (fd2 != fd) { 1087 setTimeInMillis(time - zoneOffset); 1088 } 1089 } 1090 } 1091 } 1092 1093 /** 1094 * Adds or subtracts (up/down) a single unit of time on the given time 1095 * field without changing larger fields. 1096 * <p> 1097 * <em>Example</em>: Consider a {@code GregorianCalendar} 1098 * originally set to December 31, 1999. Calling {@link #roll(int,boolean) roll(Calendar.MONTH, true)} 1099 * sets the calendar to January 31, 1999. The {@code YEAR} field is unchanged 1100 * because it is a larger field than {@code MONTH}.</p> 1101 * 1102 * @param up indicates if the value of the specified calendar field is to be 1103 * rolled up or rolled down. Use {@code true} if rolling up, {@code false} otherwise. 1104 * @throws IllegalArgumentException if {@code field} is 1105 * {@code ZONE_OFFSET}, {@code DST_OFFSET}, or unknown, 1106 * or if any calendar fields have out-of-range values in 1107 * non-lenient mode. 1108 * @see #add(int,int) 1109 * @see #set(int,int) 1110 */ 1111 @Override 1112 public void roll(int field, boolean up) { 1113 roll(field, up ? +1 : -1); 1114 } 1115 1116 /** 1117 * Adds a signed amount to the specified calendar field without changing larger fields. 1118 * A negative roll amount means to subtract from field without changing 1119 * larger fields. If the specified amount is 0, this method performs nothing. 1120 * 1121 * <p>This method calls {@link #complete()} before adding the 1122 * amount so that all the calendar fields are normalized. If there 1123 * is any calendar field having an out-of-range value in non-lenient mode, then an 1124 * {@code IllegalArgumentException} is thrown. 1125 * 1126 * <p> 1127 * <em>Example</em>: Consider a {@code GregorianCalendar} 1128 * originally set to August 31, 1999. Calling <code>roll(Calendar.MONTH, 1129 * 8)</code> sets the calendar to April 30, <strong>1999</strong>. Using a 1130 * {@code GregorianCalendar}, the {@code DAY_OF_MONTH} field cannot 1131 * be 31 in the month April. {@code DAY_OF_MONTH} is set to the closest possible 1132 * value, 30. The {@code YEAR} field maintains the value of 1999 because it 1133 * is a larger field than {@code MONTH}. 1134 * <p> 1135 * <em>Example</em>: Consider a {@code GregorianCalendar} 1136 * originally set to Sunday June 6, 1999. Calling 1137 * {@code roll(Calendar.WEEK_OF_MONTH, -1)} sets the calendar to 1138 * Tuesday June 1, 1999, whereas calling 1139 * {@code add(Calendar.WEEK_OF_MONTH, -1)} sets the calendar to 1140 * Sunday May 30, 1999. This is because the roll rule imposes an 1141 * additional constraint: The {@code MONTH} must not change when the 1142 * {@code WEEK_OF_MONTH} is rolled. Taken together with add rule 1, 1143 * the resultant date must be between Tuesday June 1 and Saturday June 1144 * 5. According to add rule 2, the {@code DAY_OF_WEEK}, an invariant 1145 * when changing the {@code WEEK_OF_MONTH}, is set to Tuesday, the 1146 * closest possible value to Sunday (where Sunday is the first day of the 1147 * week).</p> 1148 * 1149 * @param field the calendar field. 1150 * @param amount the signed amount to add to {@code field}. 1151 * @throws IllegalArgumentException if {@code field} is 1152 * {@code ZONE_OFFSET}, {@code DST_OFFSET}, or unknown, 1153 * or if any calendar fields have out-of-range values in 1154 * non-lenient mode. 1155 * @see #roll(int,boolean) 1156 * @see #add(int,int) 1157 * @see #set(int,int) 1158 * @since 1.2 1159 */ 1160 @Override 1161 public void roll(int field, int amount) { 1162 // If amount == 0, do nothing even the given field is out of 1163 // range. This is tested by JCK. 1164 if (amount == 0) { 1165 return; 1166 } 1167 1168 if (field < 0 || field >= ZONE_OFFSET) { 1169 throw new IllegalArgumentException(); 1170 } 1171 1172 // Sync the time and calendar fields. 1173 complete(); 1174 1175 int min = getMinimum(field); 1176 int max = getMaximum(field); 1177 1178 switch (field) { 1179 case AM_PM: 1180 case ERA: 1181 case YEAR: 1182 case MINUTE: 1183 case SECOND: 1184 case MILLISECOND: 1185 // These fields are handled simply, since they have fixed minima 1186 // and maxima. The field DAY_OF_MONTH is almost as simple. Other 1187 // fields are complicated, since the range within they must roll 1188 // varies depending on the date. 1189 break; 1190 1191 case HOUR: 1192 case HOUR_OF_DAY: 1193 { 1194 int rolledValue = getRolledValue(internalGet(field), amount, min, max); 1195 int hourOfDay = rolledValue; 1196 if (field == HOUR && internalGet(AM_PM) == PM) { 1197 hourOfDay += 12; 1198 } 1199 1200 // Create the current date/time value to perform wall-clock-based 1201 // roll. 1202 CalendarDate d = calsys.getCalendarDate(time, getZone()); 1203 d.setHours(hourOfDay); 1204 time = calsys.getTime(d); 1205 1206 // If we stay on the same wall-clock time, try the next or previous hour. 1207 if (internalGet(HOUR_OF_DAY) == d.getHours()) { 1208 hourOfDay = getRolledValue(rolledValue, amount > 0 ? +1 : -1, min, max); 1209 if (field == HOUR && internalGet(AM_PM) == PM) { 1210 hourOfDay += 12; 1211 } 1212 d.setHours(hourOfDay); 1213 time = calsys.getTime(d); 1214 } 1215 // Get the new hourOfDay value which might have changed due to a DST transition. 1216 hourOfDay = d.getHours(); 1217 // Update the hour related fields 1218 internalSet(HOUR_OF_DAY, hourOfDay); 1219 internalSet(AM_PM, hourOfDay / 12); 1220 internalSet(HOUR, hourOfDay % 12); 1221 1222 // Time zone offset and/or daylight saving might have changed. 1223 int zoneOffset = d.getZoneOffset(); 1224 int saving = d.getDaylightSaving(); 1225 internalSet(ZONE_OFFSET, zoneOffset - saving); 1226 internalSet(DST_OFFSET, saving); 1227 return; 1228 } 1229 1230 case MONTH: 1231 // Rolling the month involves both pinning the final value to [0, 11] 1232 // and adjusting the DAY_OF_MONTH if necessary. We only adjust the 1233 // DAY_OF_MONTH if, after updating the MONTH field, it is illegal. 1234 // E.g., <jan31>.roll(MONTH, 1) -> <feb28> or <feb29>. 1235 { 1236 if (!isCutoverYear(cdate.getNormalizedYear())) { 1237 int mon = (internalGet(MONTH) + amount) % 12; 1238 if (mon < 0) { 1239 mon += 12; 1240 } 1241 set(MONTH, mon); 1242 1243 // Keep the day of month in the range. We don't want to spill over 1244 // into the next month; e.g., we don't want jan31 + 1 mo -> feb31 -> 1245 // mar3. 1246 int monthLen = monthLength(mon); 1247 if (internalGet(DAY_OF_MONTH) > monthLen) { 1248 set(DAY_OF_MONTH, monthLen); 1249 } 1250 } else { 1251 // We need to take care of different lengths in 1252 // year and month due to the cutover. 1253 int yearLength = getActualMaximum(MONTH) + 1; 1254 int mon = (internalGet(MONTH) + amount) % yearLength; 1255 if (mon < 0) { 1256 mon += yearLength; 1257 } 1258 set(MONTH, mon); 1259 int monthLen = getActualMaximum(DAY_OF_MONTH); 1260 if (internalGet(DAY_OF_MONTH) > monthLen) { 1261 set(DAY_OF_MONTH, monthLen); 1262 } 1263 } 1264 return; 1265 } 1266 1267 case WEEK_OF_YEAR: 1268 { 1269 int y = cdate.getNormalizedYear(); 1270 max = getActualMaximum(WEEK_OF_YEAR); 1271 set(DAY_OF_WEEK, internalGet(DAY_OF_WEEK)); 1272 int woy = internalGet(WEEK_OF_YEAR); 1273 int value = woy + amount; 1274 if (!isCutoverYear(y)) { 1275 int weekYear = getWeekYear(); 1276 if (weekYear == y) { 1277 // If the new value is in between min and max 1278 // (exclusive), then we can use the value. 1279 if (value > min && value < max) { 1280 set(WEEK_OF_YEAR, value); 1281 return; 1282 } 1283 long fd = getCurrentFixedDate(); 1284 // Make sure that the min week has the current DAY_OF_WEEK 1285 // in the calendar year 1286 long day1 = fd - (7 * (woy - min)); 1287 if (calsys.getYearFromFixedDate(day1) != y) { 1288 min++; 1289 } 1290 1291 // Make sure the same thing for the max week 1292 fd += 7 * (max - internalGet(WEEK_OF_YEAR)); 1293 if (calsys.getYearFromFixedDate(fd) != y) { 1294 max--; 1295 } 1296 } else { 1297 // When WEEK_OF_YEAR and YEAR are out of sync, 1298 // adjust woy and amount to stay in the calendar year. 1299 if (weekYear > y) { 1300 if (amount < 0) { 1301 amount++; 1302 } 1303 woy = max; 1304 } else { 1305 if (amount > 0) { 1306 amount -= woy - max; 1307 } 1308 woy = min; 1309 } 1310 } 1311 set(field, getRolledValue(woy, amount, min, max)); 1312 return; 1313 } 1314 1315 // Handle cutover here. 1316 long fd = getCurrentFixedDate(); 1317 BaseCalendar cal; 1318 if (gregorianCutoverYear == gregorianCutoverYearJulian) { 1319 cal = getCutoverCalendarSystem(); 1320 } else if (y == gregorianCutoverYear) { 1321 cal = gcal; 1322 } else { 1323 cal = getJulianCalendarSystem(); 1324 } 1325 long day1 = fd - (7 * (woy - min)); 1326 // Make sure that the min week has the current DAY_OF_WEEK 1327 if (cal.getYearFromFixedDate(day1) != y) { 1328 min++; 1329 } 1330 1331 // Make sure the same thing for the max week 1332 fd += 7 * (max - woy); 1333 cal = (fd >= gregorianCutoverDate) ? gcal : getJulianCalendarSystem(); 1334 if (cal.getYearFromFixedDate(fd) != y) { 1335 max--; 1336 } 1337 // value: the new WEEK_OF_YEAR which must be converted 1338 // to month and day of month. 1339 value = getRolledValue(woy, amount, min, max) - 1; 1340 BaseCalendar.Date d = getCalendarDate(day1 + value * 7); 1341 set(MONTH, d.getMonth() - 1); 1342 set(DAY_OF_MONTH, d.getDayOfMonth()); 1343 return; 1344 } 1345 1346 case WEEK_OF_MONTH: 1347 { 1348 boolean isCutoverYear = isCutoverYear(cdate.getNormalizedYear()); 1349 // dow: relative day of week from first day of week 1350 int dow = internalGet(DAY_OF_WEEK) - getFirstDayOfWeek(); 1351 if (dow < 0) { 1352 dow += 7; 1353 } 1354 1355 long fd = getCurrentFixedDate(); 1356 long month1; // fixed date of the first day (usually 1) of the month 1357 int monthLength; // actual month length 1358 if (isCutoverYear) { 1359 month1 = getFixedDateMonth1(cdate, fd); 1360 monthLength = actualMonthLength(); 1361 } else { 1362 month1 = fd - internalGet(DAY_OF_MONTH) + 1; 1363 monthLength = calsys.getMonthLength(cdate); 1364 } 1365 1366 // the first day of week of the month. 1367 long monthDay1st = BaseCalendar.getDayOfWeekDateOnOrBefore(month1 + 6, 1368 getFirstDayOfWeek()); 1369 // if the week has enough days to form a week, the 1370 // week starts from the previous month. 1371 if ((int)(monthDay1st - month1) >= getMinimalDaysInFirstWeek()) { 1372 monthDay1st -= 7; 1373 } 1374 max = getActualMaximum(field); 1375 1376 // value: the new WEEK_OF_MONTH value 1377 int value = getRolledValue(internalGet(field), amount, 1, max) - 1; 1378 1379 // nfd: fixed date of the rolled date 1380 long nfd = monthDay1st + value * 7 + dow; 1381 1382 // Unlike WEEK_OF_YEAR, we need to change day of week if the 1383 // nfd is out of the month. 1384 if (nfd < month1) { 1385 nfd = month1; 1386 } else if (nfd >= (month1 + monthLength)) { 1387 nfd = month1 + monthLength - 1; 1388 } 1389 int dayOfMonth; 1390 if (isCutoverYear) { 1391 // If we are in the cutover year, convert nfd to 1392 // its calendar date and use dayOfMonth. 1393 BaseCalendar.Date d = getCalendarDate(nfd); 1394 dayOfMonth = d.getDayOfMonth(); 1395 } else { 1396 dayOfMonth = (int)(nfd - month1) + 1; 1397 } 1398 set(DAY_OF_MONTH, dayOfMonth); 1399 return; 1400 } 1401 1402 case DAY_OF_MONTH: 1403 { 1404 if (!isCutoverYear(cdate.getNormalizedYear())) { 1405 max = calsys.getMonthLength(cdate); 1406 break; 1407 } 1408 1409 // Cutover year handling 1410 long fd = getCurrentFixedDate(); 1411 long month1 = getFixedDateMonth1(cdate, fd); 1412 // It may not be a regular month. Convert the date and range to 1413 // the relative values, perform the roll, and 1414 // convert the result back to the rolled date. 1415 int value = getRolledValue((int)(fd - month1), amount, 0, actualMonthLength() - 1); 1416 BaseCalendar.Date d = getCalendarDate(month1 + value); 1417 assert d.getMonth()-1 == internalGet(MONTH); 1418 set(DAY_OF_MONTH, d.getDayOfMonth()); 1419 return; 1420 } 1421 1422 case DAY_OF_YEAR: 1423 { 1424 max = getActualMaximum(field); 1425 if (!isCutoverYear(cdate.getNormalizedYear())) { 1426 break; 1427 } 1428 1429 // Handle cutover here. 1430 long fd = getCurrentFixedDate(); 1431 long jan1 = fd - internalGet(DAY_OF_YEAR) + 1; 1432 int value = getRolledValue((int)(fd - jan1) + 1, amount, min, max); 1433 BaseCalendar.Date d = getCalendarDate(jan1 + value - 1); 1434 set(MONTH, d.getMonth() - 1); 1435 set(DAY_OF_MONTH, d.getDayOfMonth()); 1436 return; 1437 } 1438 1439 case DAY_OF_WEEK: 1440 { 1441 if (!isCutoverYear(cdate.getNormalizedYear())) { 1442 // If the week of year is in the same year, we can 1443 // just change DAY_OF_WEEK. 1444 int weekOfYear = internalGet(WEEK_OF_YEAR); 1445 if (weekOfYear > 1 && weekOfYear < 52) { 1446 set(WEEK_OF_YEAR, weekOfYear); // update stamp[WEEK_OF_YEAR] 1447 max = SATURDAY; 1448 break; 1449 } 1450 } 1451 1452 // We need to handle it in a different way around year 1453 // boundaries and in the cutover year. Note that 1454 // changing era and year values violates the roll 1455 // rule: not changing larger calendar fields... 1456 amount %= 7; 1457 if (amount == 0) { 1458 return; 1459 } 1460 long fd = getCurrentFixedDate(); 1461 long dowFirst = BaseCalendar.getDayOfWeekDateOnOrBefore(fd, getFirstDayOfWeek()); 1462 fd += amount; 1463 if (fd < dowFirst) { 1464 fd += 7; 1465 } else if (fd >= dowFirst + 7) { 1466 fd -= 7; 1467 } 1468 BaseCalendar.Date d = getCalendarDate(fd); 1469 set(ERA, (d.getNormalizedYear() <= 0 ? BCE : CE)); 1470 set(d.getYear(), d.getMonth() - 1, d.getDayOfMonth()); 1471 return; 1472 } 1473 1474 case DAY_OF_WEEK_IN_MONTH: 1475 { 1476 min = 1; // after normalized, min should be 1. 1477 if (!isCutoverYear(cdate.getNormalizedYear())) { 1478 int dom = internalGet(DAY_OF_MONTH); 1479 int monthLength = calsys.getMonthLength(cdate); 1480 int lastDays = monthLength % 7; 1481 max = monthLength / 7; 1482 int x = (dom - 1) % 7; 1483 if (x < lastDays) { 1484 max++; 1485 } 1486 set(DAY_OF_WEEK, internalGet(DAY_OF_WEEK)); 1487 break; 1488 } 1489 1490 // Cutover year handling 1491 long fd = getCurrentFixedDate(); 1492 long month1 = getFixedDateMonth1(cdate, fd); 1493 int monthLength = actualMonthLength(); 1494 int lastDays = monthLength % 7; 1495 max = monthLength / 7; 1496 int x = (int)(fd - month1) % 7; 1497 if (x < lastDays) { 1498 max++; 1499 } 1500 int value = getRolledValue(internalGet(field), amount, min, max) - 1; 1501 fd = month1 + value * 7 + x; 1502 BaseCalendar cal = (fd >= gregorianCutoverDate) ? gcal : getJulianCalendarSystem(); 1503 BaseCalendar.Date d = (BaseCalendar.Date) cal.newCalendarDate(TimeZone.NO_TIMEZONE); 1504 cal.getCalendarDateFromFixedDate(d, fd); 1505 set(DAY_OF_MONTH, d.getDayOfMonth()); 1506 return; 1507 } 1508 } 1509 1510 set(field, getRolledValue(internalGet(field), amount, min, max)); 1511 } 1512 1513 /** 1514 * Returns the minimum value for the given calendar field of this 1515 * {@code GregorianCalendar} instance. The minimum value is 1516 * defined as the smallest value returned by the {@link 1517 * Calendar#get(int) get} method for any possible time value, 1518 * taking into consideration the current values of the 1519 * {@link Calendar#getFirstDayOfWeek() getFirstDayOfWeek}, 1520 * {@link Calendar#getMinimalDaysInFirstWeek() getMinimalDaysInFirstWeek}, 1521 * {@link #getGregorianChange() getGregorianChange} and 1522 * {@link Calendar#getTimeZone() getTimeZone} methods. 1523 * 1524 * @param field the calendar field. 1525 * @return the minimum value for the given calendar field. 1526 * @see #getMaximum(int) 1527 * @see #getGreatestMinimum(int) 1528 * @see #getLeastMaximum(int) 1529 * @see #getActualMinimum(int) 1530 * @see #getActualMaximum(int) 1531 */ 1532 @Override 1533 public int getMinimum(int field) { 1534 return MIN_VALUES[field]; 1535 } 1536 1537 /** 1538 * Returns the maximum value for the given calendar field of this 1539 * {@code GregorianCalendar} instance. The maximum value is 1540 * defined as the largest value returned by the {@link 1541 * Calendar#get(int) get} method for any possible time value, 1542 * taking into consideration the current values of the 1543 * {@link Calendar#getFirstDayOfWeek() getFirstDayOfWeek}, 1544 * {@link Calendar#getMinimalDaysInFirstWeek() getMinimalDaysInFirstWeek}, 1545 * {@link #getGregorianChange() getGregorianChange} and 1546 * {@link Calendar#getTimeZone() getTimeZone} methods. 1547 * 1548 * @param field the calendar field. 1549 * @return the maximum value for the given calendar field. 1550 * @see #getMinimum(int) 1551 * @see #getGreatestMinimum(int) 1552 * @see #getLeastMaximum(int) 1553 * @see #getActualMinimum(int) 1554 * @see #getActualMaximum(int) 1555 */ 1556 @Override 1557 public int getMaximum(int field) { 1558 switch (field) { 1559 case MONTH: 1560 case DAY_OF_MONTH: 1561 case DAY_OF_YEAR: 1562 case WEEK_OF_YEAR: 1563 case WEEK_OF_MONTH: 1564 case DAY_OF_WEEK_IN_MONTH: 1565 case YEAR: 1566 { 1567 // On or after Gregorian 200-3-1, Julian and Gregorian 1568 // calendar dates are the same or Gregorian dates are 1569 // larger (i.e., there is a "gap") after 300-3-1. 1570 if (gregorianCutoverYear > 200) { 1571 break; 1572 } 1573 // There might be "overlapping" dates. 1574 GregorianCalendar gc = (GregorianCalendar) clone(); 1575 gc.setLenient(true); 1576 gc.setTimeInMillis(gregorianCutover); 1577 int v1 = gc.getActualMaximum(field); 1578 gc.setTimeInMillis(gregorianCutover-1); 1579 int v2 = gc.getActualMaximum(field); 1580 return Math.max(MAX_VALUES[field], Math.max(v1, v2)); 1581 } 1582 } 1583 return MAX_VALUES[field]; 1584 } 1585 1586 /** 1587 * Returns the highest minimum value for the given calendar field 1588 * of this {@code GregorianCalendar} instance. The highest 1589 * minimum value is defined as the largest value returned by 1590 * {@link #getActualMinimum(int)} for any possible time value, 1591 * taking into consideration the current values of the 1592 * {@link Calendar#getFirstDayOfWeek() getFirstDayOfWeek}, 1593 * {@link Calendar#getMinimalDaysInFirstWeek() getMinimalDaysInFirstWeek}, 1594 * {@link #getGregorianChange() getGregorianChange} and 1595 * {@link Calendar#getTimeZone() getTimeZone} methods. 1596 * 1597 * @param field the calendar field. 1598 * @return the highest minimum value for the given calendar field. 1599 * @see #getMinimum(int) 1600 * @see #getMaximum(int) 1601 * @see #getLeastMaximum(int) 1602 * @see #getActualMinimum(int) 1603 * @see #getActualMaximum(int) 1604 */ 1605 @Override 1606 public int getGreatestMinimum(int field) { 1607 if (field == DAY_OF_MONTH) { 1608 BaseCalendar.Date d = getGregorianCutoverDate(); 1609 long mon1 = getFixedDateMonth1(d, gregorianCutoverDate); 1610 d = getCalendarDate(mon1); 1611 return Math.max(MIN_VALUES[field], d.getDayOfMonth()); 1612 } 1613 return MIN_VALUES[field]; 1614 } 1615 1616 /** 1617 * Returns the lowest maximum value for the given calendar field 1618 * of this {@code GregorianCalendar} instance. The lowest 1619 * maximum value is defined as the smallest value returned by 1620 * {@link #getActualMaximum(int)} for any possible time value, 1621 * taking into consideration the current values of the 1622 * {@link Calendar#getFirstDayOfWeek() getFirstDayOfWeek}, 1623 * {@link Calendar#getMinimalDaysInFirstWeek() getMinimalDaysInFirstWeek}, 1624 * {@link #getGregorianChange() getGregorianChange} and 1625 * {@link Calendar#getTimeZone() getTimeZone} methods. 1626 * 1627 * @param field the calendar field 1628 * @return the lowest maximum value for the given calendar field. 1629 * @see #getMinimum(int) 1630 * @see #getMaximum(int) 1631 * @see #getGreatestMinimum(int) 1632 * @see #getActualMinimum(int) 1633 * @see #getActualMaximum(int) 1634 */ 1635 @Override 1636 public int getLeastMaximum(int field) { 1637 switch (field) { 1638 case MONTH: 1639 case DAY_OF_MONTH: 1640 case DAY_OF_YEAR: 1641 case WEEK_OF_YEAR: 1642 case WEEK_OF_MONTH: 1643 case DAY_OF_WEEK_IN_MONTH: 1644 case YEAR: 1645 { 1646 GregorianCalendar gc = (GregorianCalendar) clone(); 1647 gc.setLenient(true); 1648 gc.setTimeInMillis(gregorianCutover); 1649 int v1 = gc.getActualMaximum(field); 1650 gc.setTimeInMillis(gregorianCutover-1); 1651 int v2 = gc.getActualMaximum(field); 1652 return Math.min(LEAST_MAX_VALUES[field], Math.min(v1, v2)); 1653 } 1654 } 1655 return LEAST_MAX_VALUES[field]; 1656 } 1657 1658 /** 1659 * Returns the minimum value that this calendar field could have, 1660 * taking into consideration the given time value and the current 1661 * values of the 1662 * {@link Calendar#getFirstDayOfWeek() getFirstDayOfWeek}, 1663 * {@link Calendar#getMinimalDaysInFirstWeek() getMinimalDaysInFirstWeek}, 1664 * {@link #getGregorianChange() getGregorianChange} and 1665 * {@link Calendar#getTimeZone() getTimeZone} methods. 1666 * 1667 * <p>For example, if the Gregorian change date is January 10, 1668 * 1970 and the date of this {@code GregorianCalendar} is 1669 * January 20, 1970, the actual minimum value of the 1670 * {@code DAY_OF_MONTH} field is 10 because the previous date 1671 * of January 10, 1970 is December 27, 1996 (in the Julian 1672 * calendar). Therefore, December 28, 1969 to January 9, 1970 1673 * don't exist. 1674 * 1675 * @param field the calendar field 1676 * @return the minimum of the given field for the time value of 1677 * this {@code GregorianCalendar} 1678 * @see #getMinimum(int) 1679 * @see #getMaximum(int) 1680 * @see #getGreatestMinimum(int) 1681 * @see #getLeastMaximum(int) 1682 * @see #getActualMaximum(int) 1683 * @since 1.2 1684 */ 1685 @Override 1686 public int getActualMinimum(int field) { 1687 if (field == DAY_OF_MONTH) { 1688 GregorianCalendar gc = getNormalizedCalendar(); 1689 int year = gc.cdate.getNormalizedYear(); 1690 if (year == gregorianCutoverYear || year == gregorianCutoverYearJulian) { 1691 long month1 = getFixedDateMonth1(gc.cdate, gc.calsys.getFixedDate(gc.cdate)); 1692 BaseCalendar.Date d = getCalendarDate(month1); 1693 return d.getDayOfMonth(); 1694 } 1695 } 1696 return getMinimum(field); 1697 } 1698 1699 /** 1700 * Returns the maximum value that this calendar field could have, 1701 * taking into consideration the given time value and the current 1702 * values of the 1703 * {@link Calendar#getFirstDayOfWeek() getFirstDayOfWeek}, 1704 * {@link Calendar#getMinimalDaysInFirstWeek() getMinimalDaysInFirstWeek}, 1705 * {@link #getGregorianChange() getGregorianChange} and 1706 * {@link Calendar#getTimeZone() getTimeZone} methods. 1707 * For example, if the date of this instance is February 1, 2004, 1708 * the actual maximum value of the {@code DAY_OF_MONTH} field 1709 * is 29 because 2004 is a leap year, and if the date of this 1710 * instance is February 1, 2005, it's 28. 1711 * 1712 * <p>This method calculates the maximum value of {@link 1713 * Calendar#WEEK_OF_YEAR WEEK_OF_YEAR} based on the {@link 1714 * Calendar#YEAR YEAR} (calendar year) value, not the <a 1715 * href="#week_year">week year</a>. Call {@link 1716 * #getWeeksInWeekYear()} to get the maximum value of {@code 1717 * WEEK_OF_YEAR} in the week year of this {@code GregorianCalendar}. 1718 * 1719 * @param field the calendar field 1720 * @return the maximum of the given field for the time value of 1721 * this {@code GregorianCalendar} 1722 * @see #getMinimum(int) 1723 * @see #getMaximum(int) 1724 * @see #getGreatestMinimum(int) 1725 * @see #getLeastMaximum(int) 1726 * @see #getActualMinimum(int) 1727 * @since 1.2 1728 */ 1729 @Override 1730 public int getActualMaximum(int field) { 1731 final int fieldsForFixedMax = ERA_MASK|DAY_OF_WEEK_MASK|HOUR_MASK|AM_PM_MASK| 1732 HOUR_OF_DAY_MASK|MINUTE_MASK|SECOND_MASK|MILLISECOND_MASK| 1733 ZONE_OFFSET_MASK|DST_OFFSET_MASK; 1734 if ((fieldsForFixedMax & (1<<field)) != 0) { 1735 return getMaximum(field); 1736 } 1737 1738 GregorianCalendar gc = getNormalizedCalendar(); 1739 BaseCalendar.Date date = gc.cdate; 1740 BaseCalendar cal = gc.calsys; 1741 int normalizedYear = date.getNormalizedYear(); 1742 1743 int value = -1; 1744 switch (field) { 1745 case MONTH: 1746 { 1747 if (!gc.isCutoverYear(normalizedYear)) { 1748 value = DECEMBER; 1749 break; 1750 } 1751 1752 // January 1 of the next year may or may not exist. 1753 long nextJan1; 1754 do { 1755 nextJan1 = gcal.getFixedDate(++normalizedYear, BaseCalendar.JANUARY, 1, null); 1756 } while (nextJan1 < gregorianCutoverDate); 1757 BaseCalendar.Date d = (BaseCalendar.Date) date.clone(); 1758 cal.getCalendarDateFromFixedDate(d, nextJan1 - 1); 1759 value = d.getMonth() - 1; 1760 } 1761 break; 1762 1763 case DAY_OF_MONTH: 1764 { 1765 value = cal.getMonthLength(date); 1766 if (!gc.isCutoverYear(normalizedYear) || date.getDayOfMonth() == value) { 1767 break; 1768 } 1769 1770 // Handle cutover year. 1771 long fd = gc.getCurrentFixedDate(); 1772 if (fd >= gregorianCutoverDate) { 1773 break; 1774 } 1775 int monthLength = gc.actualMonthLength(); 1776 long monthEnd = gc.getFixedDateMonth1(gc.cdate, fd) + monthLength - 1; 1777 // Convert the fixed date to its calendar date. 1778 BaseCalendar.Date d = gc.getCalendarDate(monthEnd); 1779 value = d.getDayOfMonth(); 1780 } 1781 break; 1782 1783 case DAY_OF_YEAR: 1784 { 1785 if (!gc.isCutoverYear(normalizedYear)) { 1786 value = cal.getYearLength(date); 1787 break; 1788 } 1789 1790 // Handle cutover year. 1791 long jan1; 1792 if (gregorianCutoverYear == gregorianCutoverYearJulian) { 1793 BaseCalendar cocal = gc.getCutoverCalendarSystem(); 1794 jan1 = cocal.getFixedDate(normalizedYear, 1, 1, null); 1795 } else if (normalizedYear == gregorianCutoverYearJulian) { 1796 jan1 = cal.getFixedDate(normalizedYear, 1, 1, null); 1797 } else { 1798 jan1 = gregorianCutoverDate; 1799 } 1800 // January 1 of the next year may or may not exist. 1801 long nextJan1 = gcal.getFixedDate(++normalizedYear, 1, 1, null); 1802 if (nextJan1 < gregorianCutoverDate) { 1803 nextJan1 = gregorianCutoverDate; 1804 } 1805 assert jan1 <= cal.getFixedDate(date.getNormalizedYear(), date.getMonth(), 1806 date.getDayOfMonth(), date); 1807 assert nextJan1 >= cal.getFixedDate(date.getNormalizedYear(), date.getMonth(), 1808 date.getDayOfMonth(), date); 1809 value = (int)(nextJan1 - jan1); 1810 } 1811 break; 1812 1813 case WEEK_OF_YEAR: 1814 { 1815 if (!gc.isCutoverYear(normalizedYear)) { 1816 // Get the day of week of January 1 of the year 1817 CalendarDate d = cal.newCalendarDate(TimeZone.NO_TIMEZONE); 1818 d.setDate(date.getYear(), BaseCalendar.JANUARY, 1); 1819 int dayOfWeek = cal.getDayOfWeek(d); 1820 // Normalize the day of week with the firstDayOfWeek value 1821 dayOfWeek -= getFirstDayOfWeek(); 1822 if (dayOfWeek < 0) { 1823 dayOfWeek += 7; 1824 } 1825 value = 52; 1826 int magic = dayOfWeek + getMinimalDaysInFirstWeek() - 1; 1827 if ((magic == 6) || 1828 (date.isLeapYear() && (magic == 5 || magic == 12))) { 1829 value++; 1830 } 1831 break; 1832 } 1833 1834 if (gc == this) { 1835 gc = (GregorianCalendar) gc.clone(); 1836 } 1837 int maxDayOfYear = getActualMaximum(DAY_OF_YEAR); 1838 gc.set(DAY_OF_YEAR, maxDayOfYear); 1839 value = gc.get(WEEK_OF_YEAR); 1840 if (internalGet(YEAR) != gc.getWeekYear()) { 1841 gc.set(DAY_OF_YEAR, maxDayOfYear - 7); 1842 value = gc.get(WEEK_OF_YEAR); 1843 } 1844 } 1845 break; 1846 1847 case WEEK_OF_MONTH: 1848 { 1849 if (!gc.isCutoverYear(normalizedYear)) { 1850 CalendarDate d = cal.newCalendarDate(null); 1851 d.setDate(date.getYear(), date.getMonth(), 1); 1852 int dayOfWeek = cal.getDayOfWeek(d); 1853 int monthLength = cal.getMonthLength(d); 1854 dayOfWeek -= getFirstDayOfWeek(); 1855 if (dayOfWeek < 0) { 1856 dayOfWeek += 7; 1857 } 1858 int nDaysFirstWeek = 7 - dayOfWeek; // # of days in the first week 1859 value = 3; 1860 if (nDaysFirstWeek >= getMinimalDaysInFirstWeek()) { 1861 value++; 1862 } 1863 monthLength -= nDaysFirstWeek + 7 * 3; 1864 if (monthLength > 0) { 1865 value++; 1866 if (monthLength > 7) { 1867 value++; 1868 } 1869 } 1870 break; 1871 } 1872 1873 // Cutover year handling 1874 if (gc == this) { 1875 gc = (GregorianCalendar) gc.clone(); 1876 } 1877 int y = gc.internalGet(YEAR); 1878 int m = gc.internalGet(MONTH); 1879 do { 1880 value = gc.get(WEEK_OF_MONTH); 1881 gc.add(WEEK_OF_MONTH, +1); 1882 } while (gc.get(YEAR) == y && gc.get(MONTH) == m); 1883 } 1884 break; 1885 1886 case DAY_OF_WEEK_IN_MONTH: 1887 { 1888 // may be in the Gregorian cutover month 1889 int ndays, dow1; 1890 int dow = date.getDayOfWeek(); 1891 if (!gc.isCutoverYear(normalizedYear)) { 1892 BaseCalendar.Date d = (BaseCalendar.Date) date.clone(); 1893 ndays = cal.getMonthLength(d); 1894 d.setDayOfMonth(1); 1895 cal.normalize(d); 1896 dow1 = d.getDayOfWeek(); 1897 } else { 1898 // Let a cloned GregorianCalendar take care of the cutover cases. 1899 if (gc == this) { 1900 gc = (GregorianCalendar) clone(); 1901 } 1902 ndays = gc.actualMonthLength(); 1903 gc.set(DAY_OF_MONTH, gc.getActualMinimum(DAY_OF_MONTH)); 1904 dow1 = gc.get(DAY_OF_WEEK); 1905 } 1906 int x = dow - dow1; 1907 if (x < 0) { 1908 x += 7; 1909 } 1910 ndays -= x; 1911 value = (ndays + 6) / 7; 1912 } 1913 break; 1914 1915 case YEAR: 1916 /* The year computation is no different, in principle, from the 1917 * others, however, the range of possible maxima is large. In 1918 * addition, the way we know we've exceeded the range is different. 1919 * For these reasons, we use the special case code below to handle 1920 * this field. 1921 * 1922 * The actual maxima for YEAR depend on the type of calendar: 1923 * 1924 * Gregorian = May 17, 292275056 BCE - Aug 17, 292278994 CE 1925 * Julian = Dec 2, 292269055 BCE - Jan 3, 292272993 CE 1926 * Hybrid = Dec 2, 292269055 BCE - Aug 17, 292278994 CE 1927 * 1928 * We know we've exceeded the maximum when either the month, date, 1929 * time, or era changes in response to setting the year. We don't 1930 * check for month, date, and time here because the year and era are 1931 * sufficient to detect an invalid year setting. NOTE: If code is 1932 * added to check the month and date in the future for some reason, 1933 * Feb 29 must be allowed to shift to Mar 1 when setting the year. 1934 */ 1935 { 1936 if (gc == this) { 1937 gc = (GregorianCalendar) clone(); 1938 } 1939 1940 // Calculate the millisecond offset from the beginning 1941 // of the year of this calendar and adjust the max 1942 // year value if we are beyond the limit in the max 1943 // year. 1944 long current = gc.getYearOffsetInMillis(); 1945 1946 if (gc.internalGetEra() == CE) { 1947 gc.setTimeInMillis(Long.MAX_VALUE); 1948 value = gc.get(YEAR); 1949 long maxEnd = gc.getYearOffsetInMillis(); 1950 if (current > maxEnd) { 1951 value--; 1952 } 1953 } else { 1954 CalendarSystem mincal = gc.getTimeInMillis() >= gregorianCutover ? 1955 gcal : getJulianCalendarSystem(); 1956 CalendarDate d = mincal.getCalendarDate(Long.MIN_VALUE, getZone()); 1957 long maxEnd = (cal.getDayOfYear(d) - 1) * 24 + d.getHours(); 1958 maxEnd *= 60; 1959 maxEnd += d.getMinutes(); 1960 maxEnd *= 60; 1961 maxEnd += d.getSeconds(); 1962 maxEnd *= 1000; 1963 maxEnd += d.getMillis(); 1964 value = d.getYear(); 1965 if (value <= 0) { 1966 assert mincal == gcal; 1967 value = 1 - value; 1968 } 1969 if (current < maxEnd) { 1970 value--; 1971 } 1972 } 1973 } 1974 break; 1975 1976 default: 1977 throw new ArrayIndexOutOfBoundsException(field); 1978 } 1979 return value; 1980 } 1981 1982 /** 1983 * Returns the millisecond offset from the beginning of this 1984 * year. This Calendar object must have been normalized. 1985 */ 1986 private long getYearOffsetInMillis() { 1987 long t = (internalGet(DAY_OF_YEAR) - 1) * 24; 1988 t += internalGet(HOUR_OF_DAY); 1989 t *= 60; 1990 t += internalGet(MINUTE); 1991 t *= 60; 1992 t += internalGet(SECOND); 1993 t *= 1000; 1994 return t + internalGet(MILLISECOND) - 1995 (internalGet(ZONE_OFFSET) + internalGet(DST_OFFSET)); 1996 } 1997 1998 @Override 1999 public Object clone() 2000 { 2001 GregorianCalendar other = (GregorianCalendar) super.clone(); 2002 2003 other.gdate = (BaseCalendar.Date) gdate.clone(); 2004 if (cdate != null) { 2005 if (cdate != gdate) { 2006 other.cdate = (BaseCalendar.Date) cdate.clone(); 2007 } else { 2008 other.cdate = other.gdate; 2009 } 2010 } 2011 other.originalFields = null; 2012 other.zoneOffsets = null; 2013 return other; 2014 } 2015 2016 @Override 2017 public TimeZone getTimeZone() { 2018 TimeZone zone = super.getTimeZone(); 2019 // To share the zone by CalendarDates 2020 gdate.setZone(zone); 2021 if (cdate != null && cdate != gdate) { 2022 cdate.setZone(zone); 2023 } 2024 return zone; 2025 } 2026 2027 @Override 2028 public void setTimeZone(TimeZone zone) { 2029 super.setTimeZone(zone); 2030 // To share the zone by CalendarDates 2031 gdate.setZone(zone); 2032 if (cdate != null && cdate != gdate) { 2033 cdate.setZone(zone); 2034 } 2035 } 2036 2037 /** 2038 * Returns {@code true} indicating this {@code GregorianCalendar} 2039 * supports week dates. 2040 * 2041 * @return {@code true} (always) 2042 * @see #getWeekYear() 2043 * @see #setWeekDate(int,int,int) 2044 * @see #getWeeksInWeekYear() 2045 * @since 1.7 2046 */ 2047 @Override 2048 public final boolean isWeekDateSupported() { 2049 return true; 2050 } 2051 2052 /** 2053 * Returns the <a href="#week_year">week year</a> represented by this 2054 * {@code GregorianCalendar}. The dates in the weeks between 1 and the 2055 * maximum week number of the week year have the same week year value 2056 * that may be one year before or after the {@link Calendar#YEAR YEAR} 2057 * (calendar year) value. 2058 * 2059 * <p>This method calls {@link Calendar#complete()} before 2060 * calculating the week year. 2061 * 2062 * @return the week year represented by this {@code GregorianCalendar}. 2063 * If the {@link Calendar#ERA ERA} value is {@link #BC}, the year is 2064 * represented by 0 or a negative number: BC 1 is 0, BC 2 2065 * is -1, BC 3 is -2, and so on. 2066 * @throws IllegalArgumentException 2067 * if any of the calendar fields is invalid in non-lenient mode. 2068 * @see #isWeekDateSupported() 2069 * @see #getWeeksInWeekYear() 2070 * @see Calendar#getFirstDayOfWeek() 2071 * @see Calendar#getMinimalDaysInFirstWeek() 2072 * @since 1.7 2073 */ 2074 @Override 2075 public int getWeekYear() { 2076 int year = get(YEAR); // implicitly calls complete() 2077 if (internalGetEra() == BCE) { 2078 year = 1 - year; 2079 } 2080 2081 // Fast path for the Gregorian calendar years that are never 2082 // affected by the Julian-Gregorian transition 2083 if (year > gregorianCutoverYear + 1) { 2084 int weekOfYear = internalGet(WEEK_OF_YEAR); 2085 if (internalGet(MONTH) == JANUARY) { 2086 if (weekOfYear >= 52) { 2087 --year; 2088 } 2089 } else { 2090 if (weekOfYear == 1) { 2091 ++year; 2092 } 2093 } 2094 return year; 2095 } 2096 2097 // General (slow) path 2098 int dayOfYear = internalGet(DAY_OF_YEAR); 2099 int maxDayOfYear = getActualMaximum(DAY_OF_YEAR); 2100 int minimalDays = getMinimalDaysInFirstWeek(); 2101 2102 // Quickly check the possibility of year adjustments before 2103 // cloning this GregorianCalendar. 2104 if (dayOfYear > minimalDays && dayOfYear < (maxDayOfYear - 6)) { 2105 return year; 2106 } 2107 2108 // Create a clone to work on the calculation 2109 GregorianCalendar cal = (GregorianCalendar) clone(); 2110 cal.setLenient(true); 2111 // Use GMT so that intermediate date calculations won't 2112 // affect the time of day fields. 2113 cal.setTimeZone(TimeZone.getTimeZone("GMT")); 2114 // Go to the first day of the year, which is usually January 1. 2115 cal.set(DAY_OF_YEAR, 1); 2116 cal.complete(); 2117 2118 // Get the first day of the first day-of-week in the year. 2119 int delta = getFirstDayOfWeek() - cal.get(DAY_OF_WEEK); 2120 if (delta != 0) { 2121 if (delta < 0) { 2122 delta += 7; 2123 } 2124 cal.add(DAY_OF_YEAR, delta); 2125 } 2126 int minDayOfYear = cal.get(DAY_OF_YEAR); 2127 if (dayOfYear < minDayOfYear) { 2128 if (minDayOfYear <= minimalDays) { 2129 --year; 2130 } 2131 } else { 2132 cal.set(YEAR, year + 1); 2133 cal.set(DAY_OF_YEAR, 1); 2134 cal.complete(); 2135 int del = getFirstDayOfWeek() - cal.get(DAY_OF_WEEK); 2136 if (del != 0) { 2137 if (del < 0) { 2138 del += 7; 2139 } 2140 cal.add(DAY_OF_YEAR, del); 2141 } 2142 minDayOfYear = cal.get(DAY_OF_YEAR) - 1; 2143 if (minDayOfYear == 0) { 2144 minDayOfYear = 7; 2145 } 2146 if (minDayOfYear >= minimalDays) { 2147 int days = maxDayOfYear - dayOfYear + 1; 2148 if (days <= (7 - minDayOfYear)) { 2149 ++year; 2150 } 2151 } 2152 } 2153 return year; 2154 } 2155 2156 /** 2157 * Sets this {@code GregorianCalendar} to the date given by the 2158 * date specifiers - <a href="#week_year">{@code weekYear}</a>, 2159 * {@code weekOfYear}, and {@code dayOfWeek}. {@code weekOfYear} 2160 * follows the <a href="#week_and_year">{@code WEEK_OF_YEAR} 2161 * numbering</a>. The {@code dayOfWeek} value must be one of the 2162 * {@link Calendar#DAY_OF_WEEK DAY_OF_WEEK} values: {@link 2163 * Calendar#SUNDAY SUNDAY} to {@link Calendar#SATURDAY SATURDAY}. 2164 * 2165 * <p>Note that the numeric day-of-week representation differs from 2166 * the ISO 8601 standard, and that the {@code weekOfYear} 2167 * numbering is compatible with the standard when {@code 2168 * getFirstDayOfWeek()} is {@code MONDAY} and {@code 2169 * getMinimalDaysInFirstWeek()} is 4. 2170 * 2171 * <p>Unlike the {@code set} method, all of the calendar fields 2172 * and the instant of time value are calculated upon return. 2173 * 2174 * <p>If {@code weekOfYear} is out of the valid week-of-year 2175 * range in {@code weekYear}, the {@code weekYear} 2176 * and {@code weekOfYear} values are adjusted in lenient 2177 * mode, or an {@code IllegalArgumentException} is thrown in 2178 * non-lenient mode. 2179 * 2180 * @param weekYear the week year 2181 * @param weekOfYear the week number based on {@code weekYear} 2182 * @param dayOfWeek the day of week value: one of the constants 2183 * for the {@link #DAY_OF_WEEK DAY_OF_WEEK} field: 2184 * {@link Calendar#SUNDAY SUNDAY}, ..., 2185 * {@link Calendar#SATURDAY SATURDAY}. 2186 * @throws IllegalArgumentException 2187 * if any of the given date specifiers is invalid, 2188 * or if any of the calendar fields are inconsistent 2189 * with the given date specifiers in non-lenient mode 2190 * @see GregorianCalendar#isWeekDateSupported() 2191 * @see Calendar#getFirstDayOfWeek() 2192 * @see Calendar#getMinimalDaysInFirstWeek() 2193 * @since 1.7 2194 */ 2195 @Override 2196 public void setWeekDate(int weekYear, int weekOfYear, int dayOfWeek) { 2197 if (dayOfWeek < SUNDAY || dayOfWeek > SATURDAY) { 2198 throw new IllegalArgumentException("invalid dayOfWeek: " + dayOfWeek); 2199 } 2200 2201 // To avoid changing the time of day fields by date 2202 // calculations, use a clone with the GMT time zone. 2203 GregorianCalendar gc = (GregorianCalendar) clone(); 2204 gc.setLenient(true); 2205 int era = gc.get(ERA); 2206 gc.clear(); 2207 gc.setTimeZone(TimeZone.getTimeZone("GMT")); 2208 gc.set(ERA, era); 2209 gc.set(YEAR, weekYear); 2210 gc.set(WEEK_OF_YEAR, 1); 2211 gc.set(DAY_OF_WEEK, getFirstDayOfWeek()); 2212 int days = dayOfWeek - getFirstDayOfWeek(); 2213 if (days < 0) { 2214 days += 7; 2215 } 2216 days += 7 * (weekOfYear - 1); 2217 if (days != 0) { 2218 gc.add(DAY_OF_YEAR, days); 2219 } else { 2220 gc.complete(); 2221 } 2222 2223 if (!isLenient() && 2224 (gc.getWeekYear() != weekYear 2225 || gc.internalGet(WEEK_OF_YEAR) != weekOfYear 2226 || gc.internalGet(DAY_OF_WEEK) != dayOfWeek)) { 2227 throw new IllegalArgumentException(); 2228 } 2229 2230 set(ERA, gc.internalGet(ERA)); 2231 set(YEAR, gc.internalGet(YEAR)); 2232 set(MONTH, gc.internalGet(MONTH)); 2233 set(DAY_OF_MONTH, gc.internalGet(DAY_OF_MONTH)); 2234 2235 // to avoid throwing an IllegalArgumentException in 2236 // non-lenient, set WEEK_OF_YEAR internally 2237 internalSet(WEEK_OF_YEAR, weekOfYear); 2238 complete(); 2239 } 2240 2241 /** 2242 * Returns the number of weeks in the <a href="#week_year">week year</a> 2243 * represented by this {@code GregorianCalendar}. 2244 * 2245 * <p>For example, if this {@code GregorianCalendar}'s date is 2246 * December 31, 2008 with <a href="#iso8601_compatible_setting">the ISO 2247 * 8601 compatible setting</a>, this method will return 53 for the 2248 * period: December 29, 2008 to January 3, 2010 while {@link 2249 * #getActualMaximum(int) getActualMaximum(WEEK_OF_YEAR)} will return 2250 * 52 for the period: December 31, 2007 to December 28, 2008. 2251 * 2252 * @return the number of weeks in the week year. 2253 * @see Calendar#WEEK_OF_YEAR 2254 * @see #getWeekYear() 2255 * @see #getActualMaximum(int) 2256 * @since 1.7 2257 */ 2258 @Override 2259 public int getWeeksInWeekYear() { 2260 GregorianCalendar gc = getNormalizedCalendar(); 2261 int weekYear = gc.getWeekYear(); 2262 if (weekYear == gc.internalGet(YEAR)) { 2263 return gc.getActualMaximum(WEEK_OF_YEAR); 2264 } 2265 2266 // Use the 2nd week for calculating the max of WEEK_OF_YEAR 2267 if (gc == this) { 2268 gc = (GregorianCalendar) gc.clone(); 2269 } 2270 gc.setWeekDate(weekYear, 2, internalGet(DAY_OF_WEEK)); 2271 return gc.getActualMaximum(WEEK_OF_YEAR); 2272 } 2273 2274 ///////////////////////////// 2275 // Time => Fields computation 2276 ///////////////////////////// 2277 2278 /** 2279 * The fixed date corresponding to gdate. If the value is 2280 * Long.MIN_VALUE, the fixed date value is unknown. Currently, 2281 * Julian calendar dates are not cached. 2282 */ 2283 private transient long cachedFixedDate = Long.MIN_VALUE; 2284 2285 /** 2286 * Converts the time value (millisecond offset from the <a 2287 * href="Calendar.html#Epoch">Epoch</a>) to calendar field values. 2288 * The time is <em>not</em> 2289 * recomputed first; to recompute the time, then the fields, call the 2290 * {@code complete} method. 2291 * 2292 * @see Calendar#complete 2293 */ 2294 @Override 2295 protected void computeFields() { 2296 int mask; 2297 if (isPartiallyNormalized()) { 2298 // Determine which calendar fields need to be computed. 2299 mask = getSetStateFields(); 2300 int fieldMask = ~mask & ALL_FIELDS; 2301 // We have to call computTime in case calsys == null in 2302 // order to set calsys and cdate. (6263644) 2303 if (fieldMask != 0 || calsys == null) { 2304 mask |= computeFields(fieldMask, 2305 mask & (ZONE_OFFSET_MASK|DST_OFFSET_MASK)); 2306 assert mask == ALL_FIELDS; 2307 } 2308 } else { 2309 mask = ALL_FIELDS; 2310 computeFields(mask, 0); 2311 } 2312 // After computing all the fields, set the field state to `COMPUTED'. 2313 setFieldsComputed(mask); 2314 } 2315 2316 /** 2317 * This computeFields implements the conversion from UTC 2318 * (millisecond offset from the Epoch) to calendar 2319 * field values. fieldMask specifies which fields to change the 2320 * setting state to COMPUTED, although all fields are set to 2321 * the correct values. This is required to fix 4685354. 2322 * 2323 * @param fieldMask a bit mask to specify which fields to change 2324 * the setting state. 2325 * @param tzMask a bit mask to specify which time zone offset 2326 * fields to be used for time calculations 2327 * @return a new field mask that indicates what field values have 2328 * actually been set. 2329 */ 2330 private int computeFields(int fieldMask, int tzMask) { 2331 int zoneOffset = 0; 2332 TimeZone tz = getZone(); 2333 if (zoneOffsets == null) { 2334 zoneOffsets = new int[2]; 2335 } 2336 if (tzMask != (ZONE_OFFSET_MASK|DST_OFFSET_MASK)) { 2337 if (tz instanceof ZoneInfo) { 2338 zoneOffset = ((ZoneInfo)tz).getOffsets(time, zoneOffsets); 2339 } else { 2340 zoneOffset = tz.getOffset(time); 2341 zoneOffsets[0] = tz.getRawOffset(); 2342 zoneOffsets[1] = zoneOffset - zoneOffsets[0]; 2343 } 2344 } 2345 if (tzMask != 0) { 2346 if (isFieldSet(tzMask, ZONE_OFFSET)) { 2347 zoneOffsets[0] = internalGet(ZONE_OFFSET); 2348 } 2349 if (isFieldSet(tzMask, DST_OFFSET)) { 2350 zoneOffsets[1] = internalGet(DST_OFFSET); 2351 } 2352 zoneOffset = zoneOffsets[0] + zoneOffsets[1]; 2353 } 2354 2355 // By computing time and zoneOffset separately, we can take 2356 // the wider range of time+zoneOffset than the previous 2357 // implementation. 2358 long fixedDate = zoneOffset / ONE_DAY; 2359 int timeOfDay = zoneOffset % (int)ONE_DAY; 2360 fixedDate += time / ONE_DAY; 2361 timeOfDay += (int) (time % ONE_DAY); 2362 if (timeOfDay >= ONE_DAY) { 2363 timeOfDay -= ONE_DAY; 2364 ++fixedDate; 2365 } else { 2366 while (timeOfDay < 0) { 2367 timeOfDay += ONE_DAY; 2368 --fixedDate; 2369 } 2370 } 2371 fixedDate += EPOCH_OFFSET; 2372 2373 int era = CE; 2374 int year; 2375 if (fixedDate >= gregorianCutoverDate) { 2376 // Handle Gregorian dates. 2377 assert cachedFixedDate == Long.MIN_VALUE || gdate.isNormalized() 2378 : "cache control: not normalized"; 2379 assert cachedFixedDate == Long.MIN_VALUE || 2380 gcal.getFixedDate(gdate.getNormalizedYear(), 2381 gdate.getMonth(), 2382 gdate.getDayOfMonth(), gdate) 2383 == cachedFixedDate 2384 : "cache control: inconsictency" + 2385 ", cachedFixedDate=" + cachedFixedDate + 2386 ", computed=" + 2387 gcal.getFixedDate(gdate.getNormalizedYear(), 2388 gdate.getMonth(), 2389 gdate.getDayOfMonth(), 2390 gdate) + 2391 ", date=" + gdate; 2392 2393 // See if we can use gdate to avoid date calculation. 2394 if (fixedDate != cachedFixedDate) { 2395 gcal.getCalendarDateFromFixedDate(gdate, fixedDate); 2396 cachedFixedDate = fixedDate; 2397 } 2398 2399 year = gdate.getYear(); 2400 if (year <= 0) { 2401 year = 1 - year; 2402 era = BCE; 2403 } 2404 calsys = gcal; 2405 cdate = gdate; 2406 assert cdate.getDayOfWeek() > 0 : "dow="+cdate.getDayOfWeek()+", date="+cdate; 2407 } else { 2408 // Handle Julian calendar dates. 2409 calsys = getJulianCalendarSystem(); 2410 cdate = (BaseCalendar.Date) jcal.newCalendarDate(getZone()); 2411 jcal.getCalendarDateFromFixedDate(cdate, fixedDate); 2412 Era e = cdate.getEra(); 2413 if (e == jeras[0]) { 2414 era = BCE; 2415 } 2416 year = cdate.getYear(); 2417 } 2418 2419 // Always set the ERA and YEAR values. 2420 internalSet(ERA, era); 2421 internalSet(YEAR, year); 2422 int mask = fieldMask | (ERA_MASK|YEAR_MASK); 2423 2424 int month = cdate.getMonth() - 1; // 0-based 2425 int dayOfMonth = cdate.getDayOfMonth(); 2426 2427 // Set the basic date fields. 2428 if ((fieldMask & (MONTH_MASK|DAY_OF_MONTH_MASK|DAY_OF_WEEK_MASK)) 2429 != 0) { 2430 internalSet(MONTH, month); 2431 internalSet(DAY_OF_MONTH, dayOfMonth); 2432 internalSet(DAY_OF_WEEK, cdate.getDayOfWeek()); 2433 mask |= MONTH_MASK|DAY_OF_MONTH_MASK|DAY_OF_WEEK_MASK; 2434 } 2435 2436 if ((fieldMask & (HOUR_OF_DAY_MASK|AM_PM_MASK|HOUR_MASK 2437 |MINUTE_MASK|SECOND_MASK|MILLISECOND_MASK)) != 0) { 2438 if (timeOfDay != 0) { 2439 int hours = timeOfDay / ONE_HOUR; 2440 internalSet(HOUR_OF_DAY, hours); 2441 internalSet(AM_PM, hours / 12); // Assume AM == 0 2442 internalSet(HOUR, hours % 12); 2443 int r = timeOfDay % ONE_HOUR; 2444 internalSet(MINUTE, r / ONE_MINUTE); 2445 r %= ONE_MINUTE; 2446 internalSet(SECOND, r / ONE_SECOND); 2447 internalSet(MILLISECOND, r % ONE_SECOND); 2448 } else { 2449 internalSet(HOUR_OF_DAY, 0); 2450 internalSet(AM_PM, AM); 2451 internalSet(HOUR, 0); 2452 internalSet(MINUTE, 0); 2453 internalSet(SECOND, 0); 2454 internalSet(MILLISECOND, 0); 2455 } 2456 mask |= (HOUR_OF_DAY_MASK|AM_PM_MASK|HOUR_MASK 2457 |MINUTE_MASK|SECOND_MASK|MILLISECOND_MASK); 2458 } 2459 2460 if ((fieldMask & (ZONE_OFFSET_MASK|DST_OFFSET_MASK)) != 0) { 2461 internalSet(ZONE_OFFSET, zoneOffsets[0]); 2462 internalSet(DST_OFFSET, zoneOffsets[1]); 2463 mask |= (ZONE_OFFSET_MASK|DST_OFFSET_MASK); 2464 } 2465 2466 if ((fieldMask & (DAY_OF_YEAR_MASK|WEEK_OF_YEAR_MASK|WEEK_OF_MONTH_MASK|DAY_OF_WEEK_IN_MONTH_MASK)) != 0) { 2467 int normalizedYear = cdate.getNormalizedYear(); 2468 long fixedDateJan1 = calsys.getFixedDate(normalizedYear, 1, 1, cdate); 2469 int dayOfYear = (int)(fixedDate - fixedDateJan1) + 1; 2470 long fixedDateMonth1 = fixedDate - dayOfMonth + 1; 2471 int cutoverGap = 0; 2472 int cutoverYear = (calsys == gcal) ? gregorianCutoverYear : gregorianCutoverYearJulian; 2473 int relativeDayOfMonth = dayOfMonth - 1; 2474 2475 // If we are in the cutover year, we need some special handling. 2476 if (normalizedYear == cutoverYear) { 2477 // Need to take care of the "missing" days. 2478 if (gregorianCutoverYearJulian <= gregorianCutoverYear) { 2479 // We need to find out where we are. The cutover 2480 // gap could even be more than one year. (One 2481 // year difference in ~48667 years.) 2482 fixedDateJan1 = getFixedDateJan1(cdate, fixedDate); 2483 if (fixedDate >= gregorianCutoverDate) { 2484 fixedDateMonth1 = getFixedDateMonth1(cdate, fixedDate); 2485 } 2486 } 2487 int realDayOfYear = (int)(fixedDate - fixedDateJan1) + 1; 2488 cutoverGap = dayOfYear - realDayOfYear; 2489 dayOfYear = realDayOfYear; 2490 relativeDayOfMonth = (int)(fixedDate - fixedDateMonth1); 2491 } 2492 internalSet(DAY_OF_YEAR, dayOfYear); 2493 internalSet(DAY_OF_WEEK_IN_MONTH, relativeDayOfMonth / 7 + 1); 2494 2495 int weekOfYear = getWeekNumber(fixedDateJan1, fixedDate); 2496 2497 // The spec is to calculate WEEK_OF_YEAR in the 2498 // ISO8601-style. This creates problems, though. 2499 if (weekOfYear == 0) { 2500 // If the date belongs to the last week of the 2501 // previous year, use the week number of "12/31" of 2502 // the "previous" year. Again, if the previous year is 2503 // the Gregorian cutover year, we need to take care of 2504 // it. Usually the previous day of January 1 is 2505 // December 31, which is not always true in 2506 // GregorianCalendar. 2507 long fixedDec31 = fixedDateJan1 - 1; 2508 long prevJan1 = fixedDateJan1 - 365; 2509 if (normalizedYear > (cutoverYear + 1)) { 2510 if (CalendarUtils.isGregorianLeapYear(normalizedYear - 1)) { 2511 --prevJan1; 2512 } 2513 } else if (normalizedYear <= gregorianCutoverYearJulian) { 2514 if (CalendarUtils.isJulianLeapYear(normalizedYear - 1)) { 2515 --prevJan1; 2516 } 2517 } else { 2518 BaseCalendar calForJan1 = calsys; 2519 //int prevYear = normalizedYear - 1; 2520 int prevYear = getCalendarDate(fixedDec31).getNormalizedYear(); 2521 if (prevYear == gregorianCutoverYear) { 2522 calForJan1 = getCutoverCalendarSystem(); 2523 if (calForJan1 == jcal) { 2524 prevJan1 = calForJan1.getFixedDate(prevYear, 2525 BaseCalendar.JANUARY, 2526 1, 2527 null); 2528 } else { 2529 prevJan1 = gregorianCutoverDate; 2530 calForJan1 = gcal; 2531 } 2532 } else if (prevYear <= gregorianCutoverYearJulian) { 2533 calForJan1 = getJulianCalendarSystem(); 2534 prevJan1 = calForJan1.getFixedDate(prevYear, 2535 BaseCalendar.JANUARY, 2536 1, 2537 null); 2538 } 2539 } 2540 weekOfYear = getWeekNumber(prevJan1, fixedDec31); 2541 } else { 2542 if (normalizedYear > gregorianCutoverYear || 2543 normalizedYear < (gregorianCutoverYearJulian - 1)) { 2544 // Regular years 2545 if (weekOfYear >= 52) { 2546 long nextJan1 = fixedDateJan1 + 365; 2547 if (cdate.isLeapYear()) { 2548 nextJan1++; 2549 } 2550 long nextJan1st = BaseCalendar.getDayOfWeekDateOnOrBefore(nextJan1 + 6, 2551 getFirstDayOfWeek()); 2552 int ndays = (int)(nextJan1st - nextJan1); 2553 if (ndays >= getMinimalDaysInFirstWeek() && fixedDate >= (nextJan1st - 7)) { 2554 // The first days forms a week in which the date is included. 2555 weekOfYear = 1; 2556 } 2557 } 2558 } else { 2559 BaseCalendar calForJan1 = calsys; 2560 int nextYear = normalizedYear + 1; 2561 if (nextYear == (gregorianCutoverYearJulian + 1) && 2562 nextYear < gregorianCutoverYear) { 2563 // In case the gap is more than one year. 2564 nextYear = gregorianCutoverYear; 2565 } 2566 if (nextYear == gregorianCutoverYear) { 2567 calForJan1 = getCutoverCalendarSystem(); 2568 } 2569 2570 long nextJan1; 2571 if (nextYear > gregorianCutoverYear 2572 || gregorianCutoverYearJulian == gregorianCutoverYear 2573 || nextYear == gregorianCutoverYearJulian) { 2574 nextJan1 = calForJan1.getFixedDate(nextYear, 2575 BaseCalendar.JANUARY, 2576 1, 2577 null); 2578 } else { 2579 nextJan1 = gregorianCutoverDate; 2580 calForJan1 = gcal; 2581 } 2582 2583 long nextJan1st = BaseCalendar.getDayOfWeekDateOnOrBefore(nextJan1 + 6, 2584 getFirstDayOfWeek()); 2585 int ndays = (int)(nextJan1st - nextJan1); 2586 if (ndays >= getMinimalDaysInFirstWeek() && fixedDate >= (nextJan1st - 7)) { 2587 // The first days forms a week in which the date is included. 2588 weekOfYear = 1; 2589 } 2590 } 2591 } 2592 internalSet(WEEK_OF_YEAR, weekOfYear); 2593 internalSet(WEEK_OF_MONTH, getWeekNumber(fixedDateMonth1, fixedDate)); 2594 mask |= (DAY_OF_YEAR_MASK|WEEK_OF_YEAR_MASK|WEEK_OF_MONTH_MASK|DAY_OF_WEEK_IN_MONTH_MASK); 2595 } 2596 return mask; 2597 } 2598 2599 /** 2600 * Returns the number of weeks in a period between fixedDay1 and 2601 * fixedDate. The getFirstDayOfWeek-getMinimalDaysInFirstWeek rule 2602 * is applied to calculate the number of weeks. 2603 * 2604 * @param fixedDay1 the fixed date of the first day of the period 2605 * @param fixedDate the fixed date of the last day of the period 2606 * @return the number of weeks of the given period 2607 */ 2608 private int getWeekNumber(long fixedDay1, long fixedDate) { 2609 // We can always use `gcal' since Julian and Gregorian are the 2610 // same thing for this calculation. 2611 long fixedDay1st = Gregorian.getDayOfWeekDateOnOrBefore(fixedDay1 + 6, 2612 getFirstDayOfWeek()); 2613 int ndays = (int)(fixedDay1st - fixedDay1); 2614 assert ndays <= 7; 2615 if (ndays >= getMinimalDaysInFirstWeek()) { 2616 fixedDay1st -= 7; 2617 } 2618 int normalizedDayOfPeriod = (int)(fixedDate - fixedDay1st); 2619 if (normalizedDayOfPeriod >= 0) { 2620 return normalizedDayOfPeriod / 7 + 1; 2621 } 2622 return CalendarUtils.floorDivide(normalizedDayOfPeriod, 7) + 1; 2623 } 2624 2625 /** 2626 * Converts calendar field values to the time value (millisecond 2627 * offset from the <a href="Calendar.html#Epoch">Epoch</a>). 2628 * 2629 * @throws IllegalArgumentException if any calendar fields are invalid. 2630 */ 2631 @Override 2632 protected void computeTime() { 2633 // In non-lenient mode, perform brief checking of calendar 2634 // fields which have been set externally. Through this 2635 // checking, the field values are stored in originalFields[] 2636 // to see if any of them are normalized later. 2637 if (!isLenient()) { 2638 if (originalFields == null) { 2639 originalFields = new int[FIELD_COUNT]; 2640 } 2641 for (int field = 0; field < FIELD_COUNT; field++) { 2642 int value = internalGet(field); 2643 if (isExternallySet(field)) { 2644 // Quick validation for any out of range values 2645 if (value < getMinimum(field) || value > getMaximum(field)) { 2646 throw new IllegalArgumentException(getFieldName(field)); 2647 } 2648 } 2649 originalFields[field] = value; 2650 } 2651 } 2652 2653 // Let the super class determine which calendar fields to be 2654 // used to calculate the time. 2655 int fieldMask = selectFields(); 2656 2657 // The year defaults to the epoch start. We don't check 2658 // fieldMask for YEAR because YEAR is a mandatory field to 2659 // determine the date. 2660 int year = isSet(YEAR) ? internalGet(YEAR) : EPOCH_YEAR; 2661 2662 int era = internalGetEra(); 2663 if (era == BCE) { 2664 year = 1 - year; 2665 } else if (era != CE) { 2666 // Even in lenient mode we disallow ERA values other than CE & BCE. 2667 // (The same normalization rule as add()/roll() could be 2668 // applied here in lenient mode. But this checking is kept 2669 // unchanged for compatibility as of 1.5.) 2670 throw new IllegalArgumentException("Invalid era"); 2671 } 2672 2673 // If year is 0 or negative, we need to set the ERA value later. 2674 if (year <= 0 && !isSet(ERA)) { 2675 fieldMask |= ERA_MASK; 2676 setFieldsComputed(ERA_MASK); 2677 } 2678 2679 // Calculate the time of day. We rely on the convention that 2680 // an UNSET field has 0. 2681 long timeOfDay = 0; 2682 if (isFieldSet(fieldMask, HOUR_OF_DAY)) { 2683 timeOfDay += (long) internalGet(HOUR_OF_DAY); 2684 } else { 2685 timeOfDay += internalGet(HOUR); 2686 // The default value of AM_PM is 0 which designates AM. 2687 if (isFieldSet(fieldMask, AM_PM)) { 2688 timeOfDay += 12 * internalGet(AM_PM); 2689 } 2690 } 2691 timeOfDay *= 60; 2692 timeOfDay += internalGet(MINUTE); 2693 timeOfDay *= 60; 2694 timeOfDay += internalGet(SECOND); 2695 timeOfDay *= 1000; 2696 timeOfDay += internalGet(MILLISECOND); 2697 2698 // Convert the time of day to the number of days and the 2699 // millisecond offset from midnight. 2700 long fixedDate = timeOfDay / ONE_DAY; 2701 timeOfDay %= ONE_DAY; 2702 while (timeOfDay < 0) { 2703 timeOfDay += ONE_DAY; 2704 --fixedDate; 2705 } 2706 2707 // Calculate the fixed date since January 1, 1 (Gregorian). 2708 calculateFixedDate: { 2709 long gfd, jfd; 2710 if (year > gregorianCutoverYear && year > gregorianCutoverYearJulian) { 2711 gfd = fixedDate + getFixedDate(gcal, year, fieldMask); 2712 if (gfd >= gregorianCutoverDate) { 2713 fixedDate = gfd; 2714 break calculateFixedDate; 2715 } 2716 jfd = fixedDate + getFixedDate(getJulianCalendarSystem(), year, fieldMask); 2717 } else if (year < gregorianCutoverYear && year < gregorianCutoverYearJulian) { 2718 jfd = fixedDate + getFixedDate(getJulianCalendarSystem(), year, fieldMask); 2719 if (jfd < gregorianCutoverDate) { 2720 fixedDate = jfd; 2721 break calculateFixedDate; 2722 } 2723 gfd = jfd; 2724 } else { 2725 jfd = fixedDate + getFixedDate(getJulianCalendarSystem(), year, fieldMask); 2726 gfd = fixedDate + getFixedDate(gcal, year, fieldMask); 2727 } 2728 2729 // Now we have to determine which calendar date it is. 2730 2731 // If the date is relative from the beginning of the year 2732 // in the Julian calendar, then use jfd; 2733 if (isFieldSet(fieldMask, DAY_OF_YEAR) || isFieldSet(fieldMask, WEEK_OF_YEAR)) { 2734 if (gregorianCutoverYear == gregorianCutoverYearJulian) { 2735 fixedDate = jfd; 2736 break calculateFixedDate; 2737 } else if (year == gregorianCutoverYear) { 2738 fixedDate = gfd; 2739 break calculateFixedDate; 2740 } 2741 } 2742 2743 if (gfd >= gregorianCutoverDate) { 2744 if (jfd >= gregorianCutoverDate) { 2745 fixedDate = gfd; 2746 } else { 2747 // The date is in an "overlapping" period. No way 2748 // to disambiguate it. Determine it using the 2749 // previous date calculation. 2750 if (calsys == gcal || calsys == null) { 2751 fixedDate = gfd; 2752 } else { 2753 fixedDate = jfd; 2754 } 2755 } 2756 } else { 2757 if (jfd < gregorianCutoverDate) { 2758 fixedDate = jfd; 2759 } else { 2760 // The date is in a "missing" period. 2761 if (!isLenient()) { 2762 throw new IllegalArgumentException("the specified date doesn't exist"); 2763 } 2764 // Take the Julian date for compatibility, which 2765 // will produce a Gregorian date. 2766 fixedDate = jfd; 2767 } 2768 } 2769 } 2770 2771 // millis represents local wall-clock time in milliseconds. 2772 long millis = (fixedDate - EPOCH_OFFSET) * ONE_DAY + timeOfDay; 2773 2774 // Compute the time zone offset and DST offset. There are two potential 2775 // ambiguities here. We'll assume a 2:00 am (wall time) switchover time 2776 // for discussion purposes here. 2777 // 1. The transition into DST. Here, a designated time of 2:00 am - 2:59 am 2778 // can be in standard or in DST depending. However, 2:00 am is an invalid 2779 // representation (the representation jumps from 1:59:59 am Std to 3:00:00 am DST). 2780 // We assume standard time. 2781 // 2. The transition out of DST. Here, a designated time of 1:00 am - 1:59 am 2782 // can be in standard or DST. Both are valid representations (the rep 2783 // jumps from 1:59:59 DST to 1:00:00 Std). 2784 // Again, we assume standard time. 2785 // We use the TimeZone object, unless the user has explicitly set the ZONE_OFFSET 2786 // or DST_OFFSET fields; then we use those fields. 2787 TimeZone zone = getZone(); 2788 if (zoneOffsets == null) { 2789 zoneOffsets = new int[2]; 2790 } 2791 int tzMask = fieldMask & (ZONE_OFFSET_MASK|DST_OFFSET_MASK); 2792 if (tzMask != (ZONE_OFFSET_MASK|DST_OFFSET_MASK)) { 2793 if (zone instanceof ZoneInfo) { 2794 ((ZoneInfo)zone).getOffsetsByWall(millis, zoneOffsets); 2795 } else { 2796 int gmtOffset = isFieldSet(fieldMask, ZONE_OFFSET) ? 2797 internalGet(ZONE_OFFSET) : zone.getRawOffset(); 2798 zone.getOffsets(millis - gmtOffset, zoneOffsets); 2799 } 2800 } 2801 if (tzMask != 0) { 2802 if (isFieldSet(tzMask, ZONE_OFFSET)) { 2803 zoneOffsets[0] = internalGet(ZONE_OFFSET); 2804 } 2805 if (isFieldSet(tzMask, DST_OFFSET)) { 2806 zoneOffsets[1] = internalGet(DST_OFFSET); 2807 } 2808 } 2809 2810 // Adjust the time zone offset values to get the UTC time. 2811 millis -= zoneOffsets[0] + zoneOffsets[1]; 2812 2813 // Set this calendar's time in milliseconds 2814 time = millis; 2815 2816 int mask = computeFields(fieldMask | getSetStateFields(), tzMask); 2817 2818 if (!isLenient()) { 2819 for (int field = 0; field < FIELD_COUNT; field++) { 2820 if (!isExternallySet(field)) { 2821 continue; 2822 } 2823 if (originalFields[field] != internalGet(field)) { 2824 String s = originalFields[field] + " -> " + internalGet(field); 2825 // Restore the original field values 2826 System.arraycopy(originalFields, 0, fields, 0, fields.length); 2827 throw new IllegalArgumentException(getFieldName(field) + ": " + s); 2828 } 2829 } 2830 } 2831 setFieldsNormalized(mask); 2832 } 2833 2834 /** 2835 * Computes the fixed date under either the Gregorian or the 2836 * Julian calendar, using the given year and the specified calendar fields. 2837 * 2838 * @param cal the CalendarSystem to be used for the date calculation 2839 * @param year the normalized year number, with 0 indicating the 2840 * year 1 BCE, -1 indicating 2 BCE, etc. 2841 * @param fieldMask the calendar fields to be used for the date calculation 2842 * @return the fixed date 2843 * @see Calendar#selectFields 2844 */ 2845 private long getFixedDate(BaseCalendar cal, int year, int fieldMask) { 2846 int month = JANUARY; 2847 if (isFieldSet(fieldMask, MONTH)) { 2848 // No need to check if MONTH has been set (no isSet(MONTH) 2849 // call) since its unset value happens to be JANUARY (0). 2850 month = internalGet(MONTH); 2851 2852 // If the month is out of range, adjust it into range 2853 if (month > DECEMBER) { 2854 year += month / 12; 2855 month %= 12; 2856 } else if (month < JANUARY) { 2857 int[] rem = new int[1]; 2858 year += CalendarUtils.floorDivide(month, 12, rem); 2859 month = rem[0]; 2860 } 2861 } 2862 2863 // Get the fixed date since Jan 1, 1 (Gregorian). We are on 2864 // the first day of either `month' or January in 'year'. 2865 long fixedDate = cal.getFixedDate(year, month + 1, 1, 2866 cal == gcal ? gdate : null); 2867 if (isFieldSet(fieldMask, MONTH)) { 2868 // Month-based calculations 2869 if (isFieldSet(fieldMask, DAY_OF_MONTH)) { 2870 // We are on the first day of the month. Just add the 2871 // offset if DAY_OF_MONTH is set. If the isSet call 2872 // returns false, that means DAY_OF_MONTH has been 2873 // selected just because of the selected 2874 // combination. We don't need to add any since the 2875 // default value is the 1st. 2876 if (isSet(DAY_OF_MONTH)) { 2877 // To avoid underflow with DAY_OF_MONTH-1, add 2878 // DAY_OF_MONTH, then subtract 1. 2879 fixedDate += internalGet(DAY_OF_MONTH); 2880 fixedDate--; 2881 } 2882 } else { 2883 if (isFieldSet(fieldMask, WEEK_OF_MONTH)) { 2884 long firstDayOfWeek = BaseCalendar.getDayOfWeekDateOnOrBefore(fixedDate + 6, 2885 getFirstDayOfWeek()); 2886 // If we have enough days in the first week, then 2887 // move to the previous week. 2888 if ((firstDayOfWeek - fixedDate) >= getMinimalDaysInFirstWeek()) { 2889 firstDayOfWeek -= 7; 2890 } 2891 if (isFieldSet(fieldMask, DAY_OF_WEEK)) { 2892 firstDayOfWeek = BaseCalendar.getDayOfWeekDateOnOrBefore(firstDayOfWeek + 6, 2893 internalGet(DAY_OF_WEEK)); 2894 } 2895 // In lenient mode, we treat days of the previous 2896 // months as a part of the specified 2897 // WEEK_OF_MONTH. See 4633646. 2898 fixedDate = firstDayOfWeek + 7 * (internalGet(WEEK_OF_MONTH) - 1); 2899 } else { 2900 int dayOfWeek; 2901 if (isFieldSet(fieldMask, DAY_OF_WEEK)) { 2902 dayOfWeek = internalGet(DAY_OF_WEEK); 2903 } else { 2904 dayOfWeek = getFirstDayOfWeek(); 2905 } 2906 // We are basing this on the day-of-week-in-month. The only 2907 // trickiness occurs if the day-of-week-in-month is 2908 // negative. 2909 int dowim; 2910 if (isFieldSet(fieldMask, DAY_OF_WEEK_IN_MONTH)) { 2911 dowim = internalGet(DAY_OF_WEEK_IN_MONTH); 2912 } else { 2913 dowim = 1; 2914 } 2915 if (dowim >= 0) { 2916 fixedDate = BaseCalendar.getDayOfWeekDateOnOrBefore(fixedDate + (7 * dowim) - 1, 2917 dayOfWeek); 2918 } else { 2919 // Go to the first day of the next week of 2920 // the specified week boundary. 2921 int lastDate = monthLength(month, year) + (7 * (dowim + 1)); 2922 // Then, get the day of week date on or before the last date. 2923 fixedDate = BaseCalendar.getDayOfWeekDateOnOrBefore(fixedDate + lastDate - 1, 2924 dayOfWeek); 2925 } 2926 } 2927 } 2928 } else { 2929 if (year == gregorianCutoverYear && cal == gcal 2930 && fixedDate < gregorianCutoverDate 2931 && gregorianCutoverYear != gregorianCutoverYearJulian) { 2932 // January 1 of the year doesn't exist. Use 2933 // gregorianCutoverDate as the first day of the 2934 // year. 2935 fixedDate = gregorianCutoverDate; 2936 } 2937 // We are on the first day of the year. 2938 if (isFieldSet(fieldMask, DAY_OF_YEAR)) { 2939 // Add the offset, then subtract 1. (Make sure to avoid underflow.) 2940 fixedDate += internalGet(DAY_OF_YEAR); 2941 fixedDate--; 2942 } else { 2943 long firstDayOfWeek = BaseCalendar.getDayOfWeekDateOnOrBefore(fixedDate + 6, 2944 getFirstDayOfWeek()); 2945 // If we have enough days in the first week, then move 2946 // to the previous week. 2947 if ((firstDayOfWeek - fixedDate) >= getMinimalDaysInFirstWeek()) { 2948 firstDayOfWeek -= 7; 2949 } 2950 if (isFieldSet(fieldMask, DAY_OF_WEEK)) { 2951 int dayOfWeek = internalGet(DAY_OF_WEEK); 2952 if (dayOfWeek != getFirstDayOfWeek()) { 2953 firstDayOfWeek = BaseCalendar.getDayOfWeekDateOnOrBefore(firstDayOfWeek + 6, 2954 dayOfWeek); 2955 } 2956 } 2957 fixedDate = firstDayOfWeek + 7 * ((long)internalGet(WEEK_OF_YEAR) - 1); 2958 } 2959 } 2960 2961 return fixedDate; 2962 } 2963 2964 /** 2965 * Returns this object if it's normalized (all fields and time are 2966 * in sync). Otherwise, a cloned object is returned after calling 2967 * complete() in lenient mode. 2968 */ 2969 private GregorianCalendar getNormalizedCalendar() { 2970 GregorianCalendar gc; 2971 if (isFullyNormalized()) { 2972 gc = this; 2973 } else { 2974 // Create a clone and normalize the calendar fields 2975 gc = (GregorianCalendar) this.clone(); 2976 gc.setLenient(true); 2977 gc.complete(); 2978 } 2979 return gc; 2980 } 2981 2982 /** 2983 * Returns the Julian calendar system instance (singleton). 'jcal' 2984 * and 'jeras' are set upon the return. 2985 */ 2986 private static synchronized BaseCalendar getJulianCalendarSystem() { 2987 if (jcal == null) { 2988 jcal = (JulianCalendar) CalendarSystem.forName("julian"); 2989 jeras = jcal.getEras(); 2990 } 2991 return jcal; 2992 } 2993 2994 /** 2995 * Returns the calendar system for dates before the cutover date 2996 * in the cutover year. If the cutover date is January 1, the 2997 * method returns Gregorian. Otherwise, Julian. 2998 */ 2999 private BaseCalendar getCutoverCalendarSystem() { 3000 if (gregorianCutoverYearJulian < gregorianCutoverYear) { 3001 return gcal; 3002 } 3003 return getJulianCalendarSystem(); 3004 } 3005 3006 /** 3007 * Determines if the specified year (normalized) is the Gregorian 3008 * cutover year. This object must have been normalized. 3009 */ 3010 private boolean isCutoverYear(int normalizedYear) { 3011 int cutoverYear = (calsys == gcal) ? gregorianCutoverYear : gregorianCutoverYearJulian; 3012 return normalizedYear == cutoverYear; 3013 } 3014 3015 /** 3016 * Returns the fixed date of the first day of the year (usually 3017 * January 1) before the specified date. 3018 * 3019 * @param date the date for which the first day of the year is 3020 * calculated. The date has to be in the cut-over year (Gregorian 3021 * or Julian). 3022 * @param fixedDate the fixed date representation of the date 3023 */ 3024 private long getFixedDateJan1(BaseCalendar.Date date, long fixedDate) { 3025 assert date.getNormalizedYear() == gregorianCutoverYear || 3026 date.getNormalizedYear() == gregorianCutoverYearJulian; 3027 if (gregorianCutoverYear != gregorianCutoverYearJulian) { 3028 if (fixedDate >= gregorianCutoverDate) { 3029 // Dates before the cutover date don't exist 3030 // in the same (Gregorian) year. So, no 3031 // January 1 exists in the year. Use the 3032 // cutover date as the first day of the year. 3033 return gregorianCutoverDate; 3034 } 3035 } 3036 // January 1 of the normalized year should exist. 3037 BaseCalendar juliancal = getJulianCalendarSystem(); 3038 return juliancal.getFixedDate(date.getNormalizedYear(), BaseCalendar.JANUARY, 1, null); 3039 } 3040 3041 /** 3042 * Returns the fixed date of the first date of the month (usually 3043 * the 1st of the month) before the specified date. 3044 * 3045 * @param date the date for which the first day of the month is 3046 * calculated. The date has to be in the cut-over year (Gregorian 3047 * or Julian). 3048 * @param fixedDate the fixed date representation of the date 3049 */ 3050 private long getFixedDateMonth1(BaseCalendar.Date date, long fixedDate) { 3051 assert date.getNormalizedYear() == gregorianCutoverYear || 3052 date.getNormalizedYear() == gregorianCutoverYearJulian; 3053 BaseCalendar.Date gCutover = getGregorianCutoverDate(); 3054 if (gCutover.getMonth() == BaseCalendar.JANUARY 3055 && gCutover.getDayOfMonth() == 1) { 3056 // The cutover happened on January 1. 3057 return fixedDate - date.getDayOfMonth() + 1; 3058 } 3059 3060 long fixedDateMonth1; 3061 // The cutover happened sometime during the year. 3062 if (date.getMonth() == gCutover.getMonth()) { 3063 // The cutover happened in the month. 3064 BaseCalendar.Date jLastDate = getLastJulianDate(); 3065 if (gregorianCutoverYear == gregorianCutoverYearJulian 3066 && gCutover.getMonth() == jLastDate.getMonth()) { 3067 // The "gap" fits in the same month. 3068 fixedDateMonth1 = jcal.getFixedDate(date.getNormalizedYear(), 3069 date.getMonth(), 3070 1, 3071 null); 3072 } else { 3073 // Use the cutover date as the first day of the month. 3074 fixedDateMonth1 = gregorianCutoverDate; 3075 } 3076 } else { 3077 // The cutover happened before the month. 3078 fixedDateMonth1 = fixedDate - date.getDayOfMonth() + 1; 3079 } 3080 3081 return fixedDateMonth1; 3082 } 3083 3084 /** 3085 * Returns a CalendarDate produced from the specified fixed date. 3086 * 3087 * @param fd the fixed date 3088 */ 3089 private BaseCalendar.Date getCalendarDate(long fd) { 3090 BaseCalendar cal = (fd >= gregorianCutoverDate) ? gcal : getJulianCalendarSystem(); 3091 BaseCalendar.Date d = (BaseCalendar.Date) cal.newCalendarDate(TimeZone.NO_TIMEZONE); 3092 cal.getCalendarDateFromFixedDate(d, fd); 3093 return d; 3094 } 3095 3096 /** 3097 * Returns the Gregorian cutover date as a BaseCalendar.Date. The 3098 * date is a Gregorian date. 3099 */ 3100 private BaseCalendar.Date getGregorianCutoverDate() { 3101 return getCalendarDate(gregorianCutoverDate); 3102 } 3103 3104 /** 3105 * Returns the day before the Gregorian cutover date as a 3106 * BaseCalendar.Date. The date is a Julian date. 3107 */ 3108 private BaseCalendar.Date getLastJulianDate() { 3109 return getCalendarDate(gregorianCutoverDate - 1); 3110 } 3111 3112 /** 3113 * Returns the length of the specified month in the specified 3114 * year. The year number must be normalized. 3115 * 3116 * @see #isLeapYear(int) 3117 */ 3118 private int monthLength(int month, int year) { 3119 return isLeapYear(year) ? LEAP_MONTH_LENGTH[month] : MONTH_LENGTH[month]; 3120 } 3121 3122 /** 3123 * Returns the length of the specified month in the year provided 3124 * by internalGet(YEAR). 3125 * 3126 * @see #isLeapYear(int) 3127 */ 3128 private int monthLength(int month) { 3129 int year = internalGet(YEAR); 3130 if (internalGetEra() == BCE) { 3131 year = 1 - year; 3132 } 3133 return monthLength(month, year); 3134 } 3135 3136 private int actualMonthLength() { 3137 int year = cdate.getNormalizedYear(); 3138 if (year != gregorianCutoverYear && year != gregorianCutoverYearJulian) { 3139 return calsys.getMonthLength(cdate); 3140 } 3141 BaseCalendar.Date date = (BaseCalendar.Date) cdate.clone(); 3142 long fd = calsys.getFixedDate(date); 3143 long month1 = getFixedDateMonth1(date, fd); 3144 long next1 = month1 + calsys.getMonthLength(date); 3145 if (next1 < gregorianCutoverDate) { 3146 return (int)(next1 - month1); 3147 } 3148 if (cdate != gdate) { 3149 date = (BaseCalendar.Date) gcal.newCalendarDate(TimeZone.NO_TIMEZONE); 3150 } 3151 gcal.getCalendarDateFromFixedDate(date, next1); 3152 next1 = getFixedDateMonth1(date, next1); 3153 return (int)(next1 - month1); 3154 } 3155 3156 /** 3157 * Returns the length (in days) of the specified year. The year 3158 * must be normalized. 3159 */ 3160 private int yearLength(int year) { 3161 return isLeapYear(year) ? 366 : 365; 3162 } 3163 3164 /** 3165 * Returns the length (in days) of the year provided by 3166 * internalGet(YEAR). 3167 */ 3168 private int yearLength() { 3169 int year = internalGet(YEAR); 3170 if (internalGetEra() == BCE) { 3171 year = 1 - year; 3172 } 3173 return yearLength(year); 3174 } 3175 3176 /** 3177 * After adjustments such as add(MONTH), add(YEAR), we don't want the 3178 * month to jump around. E.g., we don't want Jan 31 + 1 month to go to Mar 3179 * 3, we want it to go to Feb 28. Adjustments which might run into this 3180 * problem call this method to retain the proper month. 3181 */ 3182 private void pinDayOfMonth() { 3183 int year = internalGet(YEAR); 3184 int monthLen; 3185 if (year > gregorianCutoverYear || year < gregorianCutoverYearJulian) { 3186 monthLen = monthLength(internalGet(MONTH)); 3187 } else { 3188 GregorianCalendar gc = getNormalizedCalendar(); 3189 monthLen = gc.getActualMaximum(DAY_OF_MONTH); 3190 } 3191 int dom = internalGet(DAY_OF_MONTH); 3192 if (dom > monthLen) { 3193 set(DAY_OF_MONTH, monthLen); 3194 } 3195 } 3196 3197 /** 3198 * Returns the fixed date value of this object. The time value and 3199 * calendar fields must be in synch. 3200 */ 3201 private long getCurrentFixedDate() { 3202 return (calsys == gcal) ? cachedFixedDate : calsys.getFixedDate(cdate); 3203 } 3204 3205 /** 3206 * Returns the new value after 'roll'ing the specified value and amount. 3207 */ 3208 private static int getRolledValue(int value, int amount, int min, int max) { 3209 assert value >= min && value <= max; 3210 int range = max - min + 1; 3211 amount %= range; 3212 int n = value + amount; 3213 if (n > max) { 3214 n -= range; 3215 } else if (n < min) { 3216 n += range; 3217 } 3218 assert n >= min && n <= max; 3219 return n; 3220 } 3221 3222 /** 3223 * Returns the ERA. We need a special method for this because the 3224 * default ERA is CE, but a zero (unset) ERA is BCE. 3225 */ 3226 private int internalGetEra() { 3227 return isSet(ERA) ? internalGet(ERA) : CE; 3228 } 3229 3230 /** 3231 * Updates internal state. 3232 */ 3233 @java.io.Serial 3234 private void readObject(ObjectInputStream stream) 3235 throws IOException, ClassNotFoundException { 3236 stream.defaultReadObject(); 3237 if (gdate == null) { 3238 gdate = (BaseCalendar.Date) gcal.newCalendarDate(getZone()); 3239 cachedFixedDate = Long.MIN_VALUE; 3240 } 3241 setGregorianChange(gregorianCutover); 3242 } 3243 3244 /** 3245 * Converts this object to a {@code ZonedDateTime} that represents 3246 * the same point on the time-line as this {@code GregorianCalendar}. 3247 * <p> 3248 * Since this object supports a Julian-Gregorian cutover date and 3249 * {@code ZonedDateTime} does not, it is possible that the resulting year, 3250 * month and day will have different values. The result will represent the 3251 * correct date in the ISO calendar system, which will also be the same value 3252 * for Modified Julian Days. 3253 * 3254 * @return a zoned date-time representing the same point on the time-line 3255 * as this gregorian calendar 3256 * @since 1.8 3257 */ 3258 public ZonedDateTime toZonedDateTime() { 3259 return ZonedDateTime.ofInstant(Instant.ofEpochMilli(getTimeInMillis()), 3260 getTimeZone().toZoneId()); 3261 } 3262 3263 /** 3264 * Obtains an instance of {@code GregorianCalendar} with the default locale 3265 * from a {@code ZonedDateTime} object. 3266 * <p> 3267 * Since {@code ZonedDateTime} does not support a Julian-Gregorian cutover 3268 * date and uses ISO calendar system, the return GregorianCalendar is a pure 3269 * Gregorian calendar and uses ISO 8601 standard for week definitions, 3270 * which has {@code MONDAY} as the {@link Calendar#getFirstDayOfWeek() 3271 * FirstDayOfWeek} and {@code 4} as the value of the 3272 * {@link Calendar#getMinimalDaysInFirstWeek() MinimalDaysInFirstWeek}. 3273 * <p> 3274 * {@code ZoneDateTime} can store points on the time-line further in the 3275 * future and further in the past than {@code GregorianCalendar}. In this 3276 * scenario, this method will throw an {@code IllegalArgumentException} 3277 * exception. 3278 * 3279 * @param zdt the zoned date-time object to convert 3280 * @return the gregorian calendar representing the same point on the 3281 * time-line as the zoned date-time provided 3282 * @throws NullPointerException if {@code zdt} is null 3283 * @throws IllegalArgumentException if the zoned date-time is too 3284 * large to represent as a {@code GregorianCalendar} 3285 * @since 1.8 3286 */ 3287 public static GregorianCalendar from(ZonedDateTime zdt) { 3288 GregorianCalendar cal = new GregorianCalendar(TimeZone.getTimeZone(zdt.getZone())); 3289 cal.setGregorianChange(new Date(Long.MIN_VALUE)); 3290 cal.setFirstDayOfWeek(MONDAY); 3291 cal.setMinimalDaysInFirstWeek(4); 3292 try { 3293 cal.setTimeInMillis(Math.addExact(Math.multiplyExact(zdt.toEpochSecond(), 1000), 3294 zdt.get(ChronoField.MILLI_OF_SECOND))); 3295 } catch (ArithmeticException ex) { 3296 throw new IllegalArgumentException(ex); 3297 } 3298 return cal; 3299 } 3300 }