1 /* 2 * Copyright (c) 1996, 2016, 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</code> is a concrete subclass of 57 * <code>Calendar</code> and provides the standard calendar system 58 * used by most of the world. 59 * 60 * <p> <code>GregorianCalendar</code> 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</code> 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</code> 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</code> may be used for all years to generate 82 * meaningful and consistent results. However, dates obtained using 83 * <code>GregorianCalendar</code> 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 * <h3><a id="week_and_year">Week Of Year and Week Year</a></h3> 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 * <h4>Week Of Month</h4> 137 * 138 * <p>Values calculated for the <code>WEEK_OF_MONTH</code> 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()</code> contiguous days in that month, 142 * ending on the day before <code>getFirstDayOfWeek()</code>. 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()</code>, and will not include days of 145 * the previous month. Days of a month before week 1 have a 146 * <code>WEEK_OF_MONTH</code> of 0. 147 * 148 * <p>For example, if <code>getFirstDayOfWeek()</code> is <code>SUNDAY</code> 149 * and <code>getMinimalDaysInFirstWeek()</code> 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</code> of 1. Thursday, January 1 through 152 * Saturday, January 3 have a <code>WEEK_OF_MONTH</code> of 0. If 153 * <code>getMinimalDaysInFirstWeek()</code> is changed to 3, then January 1 154 * through January 3 have a <code>WEEK_OF_MONTH</code> of 1. 155 * 156 * <h4>Default Fields Values</h4> 157 * 158 * <p>The <code>clear</code> method sets calendar field(s) 159 * undefined. <code>GregorianCalendar</code> uses the following 160 * default value for each calendar field if its value is undefined. 161 * 162 * <table cellpadding="0" cellspacing="3" border="0" 163 * summary="GregorianCalendar default field values" 164 * style="text-align: left; width: 66%;"> 165 * <tbody> 166 * <tr> 167 * <th style="vertical-align: top; background-color: rgb(204, 204, 255); 168 * text-align: center;">Field<br> 169 * </th> 170 * <th style="vertical-align: top; background-color: rgb(204, 204, 255); 171 * text-align: center;">Default Value<br> 172 * </th> 173 * </tr> 174 * <tr> 175 * <td style="vertical-align: middle;"> 176 * <code>ERA<br></code> 177 * </td> 178 * <td style="vertical-align: middle;"> 179 * <code>AD<br></code> 180 * </td> 181 * </tr> 182 * <tr> 183 * <td style="vertical-align: middle; background-color: rgb(238, 238, 255);"> 184 * <code>YEAR<br></code> 185 * </td> 186 * <td style="vertical-align: middle; background-color: rgb(238, 238, 255);"> 187 * <code>1970<br></code> 188 * </td> 189 * </tr> 190 * <tr> 191 * <td style="vertical-align: middle;"> 192 * <code>MONTH<br></code> 193 * </td> 194 * <td style="vertical-align: middle;"> 195 * <code>JANUARY<br></code> 196 * </td> 197 * </tr> 198 * <tr> 199 * <td style="vertical-align: top; background-color: rgb(238, 238, 255);"> 200 * <code>DAY_OF_MONTH<br></code> 201 * </td> 202 * <td style="vertical-align: top; background-color: rgb(238, 238, 255);"> 203 * <code>1<br></code> 204 * </td> 205 * </tr> 206 * <tr> 207 * <td style="vertical-align: middle;"> 208 * <code>DAY_OF_WEEK<br></code> 209 * </td> 210 * <td style="vertical-align: middle;"> 211 * <code>the first day of week<br></code> 212 * </td> 213 * </tr> 214 * <tr> 215 * <td style="vertical-align: top; background-color: rgb(238, 238, 255);"> 216 * <code>WEEK_OF_MONTH<br></code> 217 * </td> 218 * <td style="vertical-align: top; background-color: rgb(238, 238, 255);"> 219 * <code>0<br></code> 220 * </td> 221 * </tr> 222 * <tr> 223 * <td style="vertical-align: top;"> 224 * <code>DAY_OF_WEEK_IN_MONTH<br></code> 225 * </td> 226 * <td style="vertical-align: top;"> 227 * <code>1<br></code> 228 * </td> 229 * </tr> 230 * <tr> 231 * <td style="vertical-align: middle; background-color: rgb(238, 238, 255);"> 232 * <code>AM_PM<br></code> 233 * </td> 234 * <td style="vertical-align: middle; background-color: rgb(238, 238, 255);"> 235 * <code>AM<br></code> 236 * </td> 237 * </tr> 238 * <tr> 239 * <td style="vertical-align: middle;"> 240 * <code>HOUR, HOUR_OF_DAY, MINUTE, SECOND, MILLISECOND<br></code> 241 * </td> 242 * <td style="vertical-align: middle;"> 243 * <code>0<br></code> 244 * </td> 245 * </tr> 246 * </tbody> 247 * </table> 248 * <br>Default values are not applicable for the fields not listed above. 249 * 250 * <p> 251 * <strong>Example:</strong> 252 * <blockquote> 253 * <pre> 254 * // get the supported ids for GMT-08:00 (Pacific Standard Time) 255 * String[] ids = TimeZone.getAvailableIDs(-8 * 60 * 60 * 1000); 256 * // if no ids were returned, something is wrong. get out. 257 * if (ids.length == 0) 258 * System.exit(0); 259 * 260 * // begin output 261 * System.out.println("Current Time"); 262 * 263 * // create a Pacific Standard Time time zone 264 * SimpleTimeZone pdt = new SimpleTimeZone(-8 * 60 * 60 * 1000, ids[0]); 265 * 266 * // set up rules for Daylight Saving Time 267 * pdt.setStartRule(Calendar.APRIL, 1, Calendar.SUNDAY, 2 * 60 * 60 * 1000); 268 * pdt.setEndRule(Calendar.OCTOBER, -1, Calendar.SUNDAY, 2 * 60 * 60 * 1000); 269 * 270 * // create a GregorianCalendar with the Pacific Daylight time zone 271 * // and the current date and time 272 * Calendar calendar = new GregorianCalendar(pdt); 273 * Date trialTime = new Date(); 274 * calendar.setTime(trialTime); 275 * 276 * // print out a bunch of interesting things 277 * System.out.println("ERA: " + calendar.get(Calendar.ERA)); 278 * System.out.println("YEAR: " + calendar.get(Calendar.YEAR)); 279 * System.out.println("MONTH: " + calendar.get(Calendar.MONTH)); 280 * System.out.println("WEEK_OF_YEAR: " + calendar.get(Calendar.WEEK_OF_YEAR)); 281 * System.out.println("WEEK_OF_MONTH: " + calendar.get(Calendar.WEEK_OF_MONTH)); 282 * System.out.println("DATE: " + calendar.get(Calendar.DATE)); 283 * System.out.println("DAY_OF_MONTH: " + calendar.get(Calendar.DAY_OF_MONTH)); 284 * System.out.println("DAY_OF_YEAR: " + calendar.get(Calendar.DAY_OF_YEAR)); 285 * System.out.println("DAY_OF_WEEK: " + calendar.get(Calendar.DAY_OF_WEEK)); 286 * System.out.println("DAY_OF_WEEK_IN_MONTH: " 287 * + calendar.get(Calendar.DAY_OF_WEEK_IN_MONTH)); 288 * System.out.println("AM_PM: " + calendar.get(Calendar.AM_PM)); 289 * System.out.println("HOUR: " + calendar.get(Calendar.HOUR)); 290 * System.out.println("HOUR_OF_DAY: " + calendar.get(Calendar.HOUR_OF_DAY)); 291 * System.out.println("MINUTE: " + calendar.get(Calendar.MINUTE)); 292 * System.out.println("SECOND: " + calendar.get(Calendar.SECOND)); 293 * System.out.println("MILLISECOND: " + calendar.get(Calendar.MILLISECOND)); 294 * System.out.println("ZONE_OFFSET: " 295 * + (calendar.get(Calendar.ZONE_OFFSET)/(60*60*1000))); 296 * System.out.println("DST_OFFSET: " 297 * + (calendar.get(Calendar.DST_OFFSET)/(60*60*1000))); 298 299 * System.out.println("Current Time, with hour reset to 3"); 300 * calendar.clear(Calendar.HOUR_OF_DAY); // so doesn't override 301 * calendar.set(Calendar.HOUR, 3); 302 * System.out.println("ERA: " + calendar.get(Calendar.ERA)); 303 * System.out.println("YEAR: " + calendar.get(Calendar.YEAR)); 304 * System.out.println("MONTH: " + calendar.get(Calendar.MONTH)); 305 * System.out.println("WEEK_OF_YEAR: " + calendar.get(Calendar.WEEK_OF_YEAR)); 306 * System.out.println("WEEK_OF_MONTH: " + calendar.get(Calendar.WEEK_OF_MONTH)); 307 * System.out.println("DATE: " + calendar.get(Calendar.DATE)); 308 * System.out.println("DAY_OF_MONTH: " + calendar.get(Calendar.DAY_OF_MONTH)); 309 * System.out.println("DAY_OF_YEAR: " + calendar.get(Calendar.DAY_OF_YEAR)); 310 * System.out.println("DAY_OF_WEEK: " + calendar.get(Calendar.DAY_OF_WEEK)); 311 * System.out.println("DAY_OF_WEEK_IN_MONTH: " 312 * + calendar.get(Calendar.DAY_OF_WEEK_IN_MONTH)); 313 * System.out.println("AM_PM: " + calendar.get(Calendar.AM_PM)); 314 * System.out.println("HOUR: " + calendar.get(Calendar.HOUR)); 315 * System.out.println("HOUR_OF_DAY: " + calendar.get(Calendar.HOUR_OF_DAY)); 316 * System.out.println("MINUTE: " + calendar.get(Calendar.MINUTE)); 317 * System.out.println("SECOND: " + calendar.get(Calendar.SECOND)); 318 * System.out.println("MILLISECOND: " + calendar.get(Calendar.MILLISECOND)); 319 * System.out.println("ZONE_OFFSET: " 320 * + (calendar.get(Calendar.ZONE_OFFSET)/(60*60*1000))); // in hours 321 * System.out.println("DST_OFFSET: " 322 * + (calendar.get(Calendar.DST_OFFSET)/(60*60*1000))); // in hours 323 * </pre> 324 * </blockquote> 325 * 326 * @see TimeZone 327 * @author David Goldsmith, Mark Davis, Chen-Lieh Huang, Alan Liu 328 * @since 1.1 329 */ 330 public class GregorianCalendar extends Calendar { 331 /* 332 * Implementation Notes 333 * 334 * The epoch is the number of days or milliseconds from some defined 335 * starting point. The epoch for java.util.Date is used here; that is, 336 * milliseconds from January 1, 1970 (Gregorian), midnight UTC. Other 337 * epochs which are used are January 1, year 1 (Gregorian), which is day 1 338 * of the Gregorian calendar, and December 30, year 0 (Gregorian), which is 339 * day 1 of the Julian calendar. 340 * 341 * We implement the proleptic Julian and Gregorian calendars. This means we 342 * implement the modern definition of the calendar even though the 343 * historical usage differs. For example, if the Gregorian change is set 344 * to new Date(Long.MIN_VALUE), we have a pure Gregorian calendar which 345 * labels dates preceding the invention of the Gregorian calendar in 1582 as 346 * if the calendar existed then. 347 * 348 * Likewise, with the Julian calendar, we assume a consistent 349 * 4-year leap year rule, even though the historical pattern of 350 * leap years is irregular, being every 3 years from 45 BCE 351 * through 9 BCE, then every 4 years from 8 CE onwards, with no 352 * leap years in-between. Thus date computations and functions 353 * such as isLeapYear() are not intended to be historically 354 * accurate. 355 */ 356 357 ////////////////// 358 // Class Variables 359 ////////////////// 360 361 /** 362 * Value of the <code>ERA</code> field indicating 363 * the period before the common era (before Christ), also known as BCE. 364 * The sequence of years at the transition from <code>BC</code> to <code>AD</code> is 365 * ..., 2 BC, 1 BC, 1 AD, 2 AD,... 366 * 367 * @see #ERA 368 */ 369 public static final int BC = 0; 370 371 /** 372 * Value of the {@link #ERA} field indicating 373 * the period before the common era, the same value as {@link #BC}. 374 * 375 * @see #CE 376 */ 377 static final int BCE = 0; 378 379 /** 380 * Value of the <code>ERA</code> field indicating 381 * the common era (Anno Domini), also known as CE. 382 * The sequence of years at the transition from <code>BC</code> to <code>AD</code> is 383 * ..., 2 BC, 1 BC, 1 AD, 2 AD,... 384 * 385 * @see #ERA 386 */ 387 public static final int AD = 1; 388 389 /** 390 * Value of the {@link #ERA} field indicating 391 * the common era, the same value as {@link #AD}. 392 * 393 * @see #BCE 394 */ 395 static final int CE = 1; 396 397 private static final int EPOCH_OFFSET = 719163; // Fixed date of January 1, 1970 (Gregorian) 398 private static final int EPOCH_YEAR = 1970; 399 400 static final int MONTH_LENGTH[] 401 = {31,28,31,30,31,30,31,31,30,31,30,31}; // 0-based 402 static final int LEAP_MONTH_LENGTH[] 403 = {31,29,31,30,31,30,31,31,30,31,30,31}; // 0-based 404 405 // Useful millisecond constants. Although ONE_DAY and ONE_WEEK can fit 406 // into ints, they must be longs in order to prevent arithmetic overflow 407 // when performing (bug 4173516). 408 private static final int ONE_SECOND = 1000; 409 private static final int ONE_MINUTE = 60*ONE_SECOND; 410 private static final int ONE_HOUR = 60*ONE_MINUTE; 411 private static final long ONE_DAY = 24*ONE_HOUR; 412 private static final long ONE_WEEK = 7*ONE_DAY; 413 414 /* 415 * <pre> 416 * Greatest Least 417 * Field name Minimum Minimum Maximum Maximum 418 * ---------- ------- ------- ------- ------- 419 * ERA 0 0 1 1 420 * YEAR 1 1 292269054 292278994 421 * MONTH 0 0 11 11 422 * WEEK_OF_YEAR 1 1 52* 53 423 * WEEK_OF_MONTH 0 0 4* 6 424 * DAY_OF_MONTH 1 1 28* 31 425 * DAY_OF_YEAR 1 1 365* 366 426 * DAY_OF_WEEK 1 1 7 7 427 * DAY_OF_WEEK_IN_MONTH 1 1 4* 6 428 * AM_PM 0 0 1 1 429 * HOUR 0 0 11 11 430 * HOUR_OF_DAY 0 0 23 23 431 * MINUTE 0 0 59 59 432 * SECOND 0 0 59 59 433 * MILLISECOND 0 0 999 999 434 * ZONE_OFFSET -13:00 -13:00 14:00 14:00 435 * DST_OFFSET 0:00 0:00 0:20 2:00 436 * </pre> 437 * *: depends on the Gregorian change date 438 */ 439 static final int MIN_VALUES[] = { 440 BCE, // ERA 441 1, // YEAR 442 JANUARY, // MONTH 443 1, // WEEK_OF_YEAR 444 0, // WEEK_OF_MONTH 445 1, // DAY_OF_MONTH 446 1, // DAY_OF_YEAR 447 SUNDAY, // DAY_OF_WEEK 448 1, // DAY_OF_WEEK_IN_MONTH 449 AM, // AM_PM 450 0, // HOUR 451 0, // HOUR_OF_DAY 452 0, // MINUTE 453 0, // SECOND 454 0, // MILLISECOND 455 -13*ONE_HOUR, // ZONE_OFFSET (UNIX compatibility) 456 0 // DST_OFFSET 457 }; 458 static final int LEAST_MAX_VALUES[] = { 459 CE, // ERA 460 292269054, // YEAR 461 DECEMBER, // MONTH 462 52, // WEEK_OF_YEAR 463 4, // WEEK_OF_MONTH 464 28, // DAY_OF_MONTH 465 365, // DAY_OF_YEAR 466 SATURDAY, // DAY_OF_WEEK 467 4, // DAY_OF_WEEK_IN 468 PM, // AM_PM 469 11, // HOUR 470 23, // HOUR_OF_DAY 471 59, // MINUTE 472 59, // SECOND 473 999, // MILLISECOND 474 14*ONE_HOUR, // ZONE_OFFSET 475 20*ONE_MINUTE // DST_OFFSET (historical least maximum) 476 }; 477 static final int MAX_VALUES[] = { 478 CE, // ERA 479 292278994, // YEAR 480 DECEMBER, // MONTH 481 53, // WEEK_OF_YEAR 482 6, // WEEK_OF_MONTH 483 31, // DAY_OF_MONTH 484 366, // DAY_OF_YEAR 485 SATURDAY, // DAY_OF_WEEK 486 6, // DAY_OF_WEEK_IN 487 PM, // AM_PM 488 11, // HOUR 489 23, // HOUR_OF_DAY 490 59, // MINUTE 491 59, // SECOND 492 999, // MILLISECOND 493 14*ONE_HOUR, // ZONE_OFFSET 494 2*ONE_HOUR // DST_OFFSET (double summer time) 495 }; 496 497 // Proclaim serialization compatibility with JDK 1.1 498 @SuppressWarnings("FieldNameHidesFieldInSuperclass") 499 static final long serialVersionUID = -8125100834729963327L; 500 501 // Reference to the sun.util.calendar.Gregorian instance (singleton). 502 private static final Gregorian gcal = 503 CalendarSystem.getGregorianCalendar(); 504 505 // Reference to the JulianCalendar instance (singleton), set as needed. See 506 // getJulianCalendarSystem(). 507 private static JulianCalendar jcal; 508 509 // JulianCalendar eras. See getJulianCalendarSystem(). 510 private static Era[] jeras; 511 512 // The default value of gregorianCutover. 513 static final long DEFAULT_GREGORIAN_CUTOVER = -12219292800000L; 514 515 ///////////////////// 516 // Instance Variables 517 ///////////////////// 518 519 /** 520 * The point at which the Gregorian calendar rules are used, measured in 521 * milliseconds from the standard epoch. Default is October 15, 1582 522 * (Gregorian) 00:00:00 UTC or -12219292800000L. For this value, October 4, 523 * 1582 (Julian) is followed by October 15, 1582 (Gregorian). This 524 * corresponds to Julian day number 2299161. 525 * @serial 526 */ 527 private long gregorianCutover = DEFAULT_GREGORIAN_CUTOVER; 528 529 /** 530 * The fixed date of the gregorianCutover. 531 */ 532 private transient long gregorianCutoverDate = 533 (((DEFAULT_GREGORIAN_CUTOVER + 1)/ONE_DAY) - 1) + EPOCH_OFFSET; // == 577736 534 535 /** 536 * The normalized year of the gregorianCutover in Gregorian, with 537 * 0 representing 1 BCE, -1 representing 2 BCE, etc. 538 */ 539 private transient int gregorianCutoverYear = 1582; 540 541 /** 542 * The normalized year of the gregorianCutover in Julian, with 0 543 * representing 1 BCE, -1 representing 2 BCE, etc. 544 */ 545 private transient int gregorianCutoverYearJulian = 1582; 546 547 /** 548 * gdate always has a sun.util.calendar.Gregorian.Date instance to 549 * avoid overhead of creating it. The assumption is that most 550 * applications will need only Gregorian calendar calculations. 551 */ 552 private transient BaseCalendar.Date gdate; 553 554 /** 555 * Reference to either gdate or a JulianCalendar.Date 556 * instance. After calling complete(), this value is guaranteed to 557 * be set. 558 */ 559 private transient BaseCalendar.Date cdate; 560 561 /** 562 * The CalendarSystem used to calculate the date in cdate. After 563 * calling complete(), this value is guaranteed to be set and 564 * consistent with the cdate value. 565 */ 566 private transient BaseCalendar calsys; 567 568 /** 569 * Temporary int[2] to get time zone offsets. zoneOffsets[0] gets 570 * the GMT offset value and zoneOffsets[1] gets the DST saving 571 * value. 572 */ 573 private transient int[] zoneOffsets; 574 575 /** 576 * Temporary storage for saving original fields[] values in 577 * non-lenient mode. 578 */ 579 private transient int[] originalFields; 580 581 /////////////// 582 // Constructors 583 /////////////// 584 585 /** 586 * Constructs a default <code>GregorianCalendar</code> using the current time 587 * in the default time zone with the default 588 * {@link Locale.Category#FORMAT FORMAT} locale. 589 */ 590 public GregorianCalendar() { 591 this(TimeZone.getDefaultRef(), Locale.getDefault(Locale.Category.FORMAT)); 592 setZoneShared(true); 593 } 594 595 /** 596 * Constructs a <code>GregorianCalendar</code> based on the current time 597 * in the given time zone with the default 598 * {@link Locale.Category#FORMAT FORMAT} locale. 599 * 600 * @param zone the given time zone. 601 */ 602 public GregorianCalendar(TimeZone zone) { 603 this(zone, Locale.getDefault(Locale.Category.FORMAT)); 604 } 605 606 /** 607 * Constructs a <code>GregorianCalendar</code> based on the current time 608 * in the default time zone with the given locale. 609 * 610 * @param aLocale the given locale. 611 */ 612 public GregorianCalendar(Locale aLocale) { 613 this(TimeZone.getDefaultRef(), aLocale); 614 setZoneShared(true); 615 } 616 617 /** 618 * Constructs a <code>GregorianCalendar</code> based on the current time 619 * in the given time zone with the given locale. 620 * 621 * @param zone the given time zone. 622 * @param aLocale the given locale. 623 */ 624 public GregorianCalendar(TimeZone zone, Locale aLocale) { 625 super(zone, aLocale); 626 gdate = (BaseCalendar.Date) gcal.newCalendarDate(zone); 627 setTimeInMillis(System.currentTimeMillis()); 628 } 629 630 /** 631 * Constructs a <code>GregorianCalendar</code> with the given date set 632 * in the default time zone with the default locale. 633 * 634 * @param year the value used to set the <code>YEAR</code> calendar field in the calendar. 635 * @param month the value used to set the <code>MONTH</code> calendar field in the calendar. 636 * Month value is 0-based. e.g., 0 for January. 637 * @param dayOfMonth the value used to set the <code>DAY_OF_MONTH</code> calendar field in the calendar. 638 */ 639 public GregorianCalendar(int year, int month, int dayOfMonth) { 640 this(year, month, dayOfMonth, 0, 0, 0, 0); 641 } 642 643 /** 644 * Constructs a <code>GregorianCalendar</code> with the given date 645 * and time set for the default time zone with the default locale. 646 * 647 * @param year the value used to set the <code>YEAR</code> calendar field in the calendar. 648 * @param month the value used to set the <code>MONTH</code> calendar field in the calendar. 649 * Month value is 0-based. e.g., 0 for January. 650 * @param dayOfMonth the value used to set the <code>DAY_OF_MONTH</code> calendar field in the calendar. 651 * @param hourOfDay the value used to set the <code>HOUR_OF_DAY</code> calendar field 652 * in the calendar. 653 * @param minute the value used to set the <code>MINUTE</code> calendar field 654 * in the calendar. 655 */ 656 public GregorianCalendar(int year, int month, int dayOfMonth, int hourOfDay, 657 int minute) { 658 this(year, month, dayOfMonth, hourOfDay, minute, 0, 0); 659 } 660 661 /** 662 * Constructs a GregorianCalendar with the given date 663 * and time set for the default time zone with the default locale. 664 * 665 * @param year the value used to set the <code>YEAR</code> calendar field in the calendar. 666 * @param month the value used to set the <code>MONTH</code> calendar field in the calendar. 667 * Month value is 0-based. e.g., 0 for January. 668 * @param dayOfMonth the value used to set the <code>DAY_OF_MONTH</code> calendar field in the calendar. 669 * @param hourOfDay the value used to set the <code>HOUR_OF_DAY</code> calendar field 670 * in the calendar. 671 * @param minute the value used to set the <code>MINUTE</code> calendar field 672 * in the calendar. 673 * @param second the value used to set the <code>SECOND</code> calendar field 674 * in the calendar. 675 */ 676 public GregorianCalendar(int year, int month, int dayOfMonth, int hourOfDay, 677 int minute, int second) { 678 this(year, month, dayOfMonth, hourOfDay, minute, second, 0); 679 } 680 681 /** 682 * Constructs a <code>GregorianCalendar</code> with the given date 683 * and time set for the default time zone with the default locale. 684 * 685 * @param year the value used to set the <code>YEAR</code> calendar field in the calendar. 686 * @param month the value used to set the <code>MONTH</code> calendar field in the calendar. 687 * Month value is 0-based. e.g., 0 for January. 688 * @param dayOfMonth the value used to set the <code>DAY_OF_MONTH</code> calendar field in the calendar. 689 * @param hourOfDay the value used to set the <code>HOUR_OF_DAY</code> calendar field 690 * in the calendar. 691 * @param minute the value used to set the <code>MINUTE</code> calendar field 692 * in the calendar. 693 * @param second the value used to set the <code>SECOND</code> calendar field 694 * in the calendar. 695 * @param millis the value used to set the <code>MILLISECOND</code> calendar field 696 */ 697 GregorianCalendar(int year, int month, int dayOfMonth, 698 int hourOfDay, int minute, int second, int millis) { 699 super(); 700 gdate = (BaseCalendar.Date) gcal.newCalendarDate(getZone()); 701 this.set(YEAR, year); 702 this.set(MONTH, month); 703 this.set(DAY_OF_MONTH, dayOfMonth); 704 705 // Set AM_PM and HOUR here to set their stamp values before 706 // setting HOUR_OF_DAY (6178071). 707 if (hourOfDay >= 12 && hourOfDay <= 23) { 708 // If hourOfDay is a valid PM hour, set the correct PM values 709 // so that it won't throw an exception in case it's set to 710 // non-lenient later. 711 this.internalSet(AM_PM, PM); 712 this.internalSet(HOUR, hourOfDay - 12); 713 } else { 714 // The default value for AM_PM is AM. 715 // We don't care any out of range value here for leniency. 716 this.internalSet(HOUR, hourOfDay); 717 } 718 // The stamp values of AM_PM and HOUR must be COMPUTED. (6440854) 719 setFieldsComputed(HOUR_MASK|AM_PM_MASK); 720 721 this.set(HOUR_OF_DAY, hourOfDay); 722 this.set(MINUTE, minute); 723 this.set(SECOND, second); 724 // should be changed to set() when this constructor is made 725 // public. 726 this.internalSet(MILLISECOND, millis); 727 } 728 729 /** 730 * Constructs an empty GregorianCalendar. 731 * 732 * @param zone the given time zone 733 * @param aLocale the given locale 734 * @param flag the flag requesting an empty instance 735 */ 736 GregorianCalendar(TimeZone zone, Locale locale, boolean flag) { 737 super(zone, locale); 738 gdate = (BaseCalendar.Date) gcal.newCalendarDate(getZone()); 739 } 740 741 ///////////////// 742 // Public methods 743 ///////////////// 744 745 /** 746 * Sets the <code>GregorianCalendar</code> change date. This is the point when the switch 747 * from Julian dates to Gregorian dates occurred. Default is October 15, 748 * 1582 (Gregorian). Previous to this, dates will be in the Julian calendar. 749 * <p> 750 * To obtain a pure Julian calendar, set the change date to 751 * <code>Date(Long.MAX_VALUE)</code>. To obtain a pure Gregorian calendar, 752 * set the change date to <code>Date(Long.MIN_VALUE)</code>. 753 * 754 * @param date the given Gregorian cutover date. 755 */ 756 public void setGregorianChange(Date date) { 757 long cutoverTime = date.getTime(); 758 if (cutoverTime == gregorianCutover) { 759 return; 760 } 761 // Before changing the cutover date, make sure to have the 762 // time of this calendar. 763 complete(); 764 setGregorianChange(cutoverTime); 765 } 766 767 private void setGregorianChange(long cutoverTime) { 768 gregorianCutover = cutoverTime; 769 gregorianCutoverDate = CalendarUtils.floorDivide(cutoverTime, ONE_DAY) 770 + EPOCH_OFFSET; 771 772 // To provide the "pure" Julian calendar as advertised. 773 // Strictly speaking, the last millisecond should be a 774 // Gregorian date. However, the API doc specifies that setting 775 // the cutover date to Long.MAX_VALUE will make this calendar 776 // a pure Julian calendar. (See 4167995) 777 if (cutoverTime == Long.MAX_VALUE) { 778 gregorianCutoverDate++; 779 } 780 781 BaseCalendar.Date d = getGregorianCutoverDate(); 782 783 // Set the cutover year (in the Gregorian year numbering) 784 gregorianCutoverYear = d.getYear(); 785 786 BaseCalendar julianCal = getJulianCalendarSystem(); 787 d = (BaseCalendar.Date) julianCal.newCalendarDate(TimeZone.NO_TIMEZONE); 788 julianCal.getCalendarDateFromFixedDate(d, gregorianCutoverDate - 1); 789 gregorianCutoverYearJulian = d.getNormalizedYear(); 790 791 if (time < gregorianCutover) { 792 // The field values are no longer valid under the new 793 // cutover date. 794 setUnnormalized(); 795 } 796 } 797 798 /** 799 * Gets the Gregorian Calendar change date. This is the point when the 800 * switch from Julian dates to Gregorian dates occurred. Default is 801 * October 15, 1582 (Gregorian). Previous to this, dates will be in the Julian 802 * calendar. 803 * 804 * @return the Gregorian cutover date for this <code>GregorianCalendar</code> object. 805 */ 806 public final Date getGregorianChange() { 807 return new Date(gregorianCutover); 808 } 809 810 /** 811 * Determines if the given year is a leap year. Returns <code>true</code> if 812 * the given year is a leap year. To specify BC year numbers, 813 * <code>1 - year number</code> must be given. For example, year BC 4 is 814 * specified as -3. 815 * 816 * @param year the given year. 817 * @return <code>true</code> if the given year is a leap year; <code>false</code> otherwise. 818 */ 819 public boolean isLeapYear(int year) { 820 if ((year & 3) != 0) { 821 return false; 822 } 823 824 if (year > gregorianCutoverYear) { 825 return (year%100 != 0) || (year%400 == 0); // Gregorian 826 } 827 if (year < gregorianCutoverYearJulian) { 828 return true; // Julian 829 } 830 boolean gregorian; 831 // If the given year is the Gregorian cutover year, we need to 832 // determine which calendar system to be applied to February in the year. 833 if (gregorianCutoverYear == gregorianCutoverYearJulian) { 834 BaseCalendar.Date d = getCalendarDate(gregorianCutoverDate); // Gregorian 835 gregorian = d.getMonth() < BaseCalendar.MARCH; 836 } else { 837 gregorian = year == gregorianCutoverYear; 838 } 839 return gregorian ? (year%100 != 0) || (year%400 == 0) : true; 840 } 841 842 /** 843 * Returns {@code "gregory"} as the calendar type. 844 * 845 * @return {@code "gregory"} 846 * @since 1.8 847 */ 848 @Override 849 public String getCalendarType() { 850 return "gregory"; 851 } 852 853 /** 854 * Compares this <code>GregorianCalendar</code> to the specified 855 * <code>Object</code>. The result is <code>true</code> if and 856 * only if the argument is a <code>GregorianCalendar</code> object 857 * that represents the same time value (millisecond offset from 858 * the <a href="Calendar.html#Epoch">Epoch</a>) under the same 859 * <code>Calendar</code> parameters and Gregorian change date as 860 * this object. 861 * 862 * @param obj the object to compare with. 863 * @return <code>true</code> if this object is equal to <code>obj</code>; 864 * <code>false</code> otherwise. 865 * @see Calendar#compareTo(Calendar) 866 */ 867 @Override 868 public boolean equals(Object obj) { 869 return obj instanceof GregorianCalendar && 870 super.equals(obj) && 871 gregorianCutover == ((GregorianCalendar)obj).gregorianCutover; 872 } 873 874 /** 875 * Generates the hash code for this <code>GregorianCalendar</code> object. 876 */ 877 @Override 878 public int hashCode() { 879 return super.hashCode() ^ (int)gregorianCutoverDate; 880 } 881 882 /** 883 * Adds the specified (signed) amount of time to the given calendar field, 884 * based on the calendar's rules. 885 * 886 * <p><em>Add rule 1</em>. The value of <code>field</code> 887 * after the call minus the value of <code>field</code> before the 888 * call is <code>amount</code>, modulo any overflow that has occurred in 889 * <code>field</code>. Overflow occurs when a field value exceeds its 890 * range and, as a result, the next larger field is incremented or 891 * decremented and the field value is adjusted back into its range.</p> 892 * 893 * <p><em>Add rule 2</em>. If a smaller field is expected to be 894 * invariant, but it is impossible for it to be equal to its 895 * prior value because of changes in its minimum or maximum after 896 * <code>field</code> is changed, then its value is adjusted to be as close 897 * as possible to its expected value. A smaller field represents a 898 * smaller unit of time. <code>HOUR</code> is a smaller field than 899 * <code>DAY_OF_MONTH</code>. No adjustment is made to smaller fields 900 * that are not expected to be invariant. The calendar system 901 * determines what fields are expected to be invariant.</p> 902 * 903 * @param field the calendar field. 904 * @param amount the amount of date or time to be added to the field. 905 * @exception IllegalArgumentException if <code>field</code> is 906 * <code>ZONE_OFFSET</code>, <code>DST_OFFSET</code>, or unknown, 907 * or if any calendar fields have out-of-range values in 908 * non-lenient mode. 909 */ 910 @Override 911 public void add(int field, int amount) { 912 // If amount == 0, do nothing even the given field is out of 913 // range. This is tested by JCK. 914 if (amount == 0) { 915 return; // Do nothing! 916 } 917 918 if (field < 0 || field >= ZONE_OFFSET) { 919 throw new IllegalArgumentException(); 920 } 921 922 // Sync the time and calendar fields. 923 complete(); 924 925 if (field == YEAR) { 926 int year = internalGet(YEAR); 927 if (internalGetEra() == CE) { 928 year += amount; 929 if (year > 0) { 930 set(YEAR, year); 931 } else { // year <= 0 932 set(YEAR, 1 - year); 933 // if year == 0, you get 1 BCE. 934 set(ERA, BCE); 935 } 936 } 937 else { // era == BCE 938 year -= amount; 939 if (year > 0) { 940 set(YEAR, year); 941 } else { // year <= 0 942 set(YEAR, 1 - year); 943 // if year == 0, you get 1 CE 944 set(ERA, CE); 945 } 946 } 947 pinDayOfMonth(); 948 } else if (field == MONTH) { 949 int month = internalGet(MONTH) + amount; 950 int year = internalGet(YEAR); 951 int y_amount; 952 953 if (month >= 0) { 954 y_amount = month/12; 955 } else { 956 y_amount = (month+1)/12 - 1; 957 } 958 if (y_amount != 0) { 959 if (internalGetEra() == CE) { 960 year += y_amount; 961 if (year > 0) { 962 set(YEAR, year); 963 } else { // year <= 0 964 set(YEAR, 1 - year); 965 // if year == 0, you get 1 BCE 966 set(ERA, BCE); 967 } 968 } 969 else { // era == BCE 970 year -= y_amount; 971 if (year > 0) { 972 set(YEAR, year); 973 } else { // year <= 0 974 set(YEAR, 1 - year); 975 // if year == 0, you get 1 CE 976 set(ERA, CE); 977 } 978 } 979 } 980 981 if (month >= 0) { 982 set(MONTH, month % 12); 983 } else { 984 // month < 0 985 month %= 12; 986 if (month < 0) { 987 month += 12; 988 } 989 set(MONTH, JANUARY + month); 990 } 991 pinDayOfMonth(); 992 } else if (field == ERA) { 993 int era = internalGet(ERA) + amount; 994 if (era < 0) { 995 era = 0; 996 } 997 if (era > 1) { 998 era = 1; 999 } 1000 set(ERA, era); 1001 } else { 1002 long delta = amount; 1003 long timeOfDay = 0; 1004 switch (field) { 1005 // Handle the time fields here. Convert the given 1006 // amount to milliseconds and call setTimeInMillis. 1007 case HOUR: 1008 case HOUR_OF_DAY: 1009 delta *= 60 * 60 * 1000; // hours to minutes 1010 break; 1011 1012 case MINUTE: 1013 delta *= 60 * 1000; // minutes to seconds 1014 break; 1015 1016 case SECOND: 1017 delta *= 1000; // seconds to milliseconds 1018 break; 1019 1020 case MILLISECOND: 1021 break; 1022 1023 // Handle week, day and AM_PM fields which involves 1024 // time zone offset change adjustment. Convert the 1025 // given amount to the number of days. 1026 case WEEK_OF_YEAR: 1027 case WEEK_OF_MONTH: 1028 case DAY_OF_WEEK_IN_MONTH: 1029 delta *= 7; 1030 break; 1031 1032 case DAY_OF_MONTH: // synonym of DATE 1033 case DAY_OF_YEAR: 1034 case DAY_OF_WEEK: 1035 break; 1036 1037 case AM_PM: 1038 // Convert the amount to the number of days (delta) 1039 // and +12 or -12 hours (timeOfDay). 1040 delta = amount / 2; 1041 timeOfDay = 12 * (amount % 2); 1042 break; 1043 } 1044 1045 // The time fields don't require time zone offset change 1046 // adjustment. 1047 if (field >= HOUR) { 1048 setTimeInMillis(time + delta); 1049 return; 1050 } 1051 1052 // The rest of the fields (week, day or AM_PM fields) 1053 // require time zone offset (both GMT and DST) change 1054 // adjustment. 1055 1056 // Translate the current time to the fixed date and time 1057 // of the day. 1058 long fd = getCurrentFixedDate(); 1059 timeOfDay += internalGet(HOUR_OF_DAY); 1060 timeOfDay *= 60; 1061 timeOfDay += internalGet(MINUTE); 1062 timeOfDay *= 60; 1063 timeOfDay += internalGet(SECOND); 1064 timeOfDay *= 1000; 1065 timeOfDay += internalGet(MILLISECOND); 1066 if (timeOfDay >= ONE_DAY) { 1067 fd++; 1068 timeOfDay -= ONE_DAY; 1069 } else if (timeOfDay < 0) { 1070 fd--; 1071 timeOfDay += ONE_DAY; 1072 } 1073 1074 fd += delta; // fd is the expected fixed date after the calculation 1075 int zoneOffset = internalGet(ZONE_OFFSET) + internalGet(DST_OFFSET); 1076 setTimeInMillis((fd - EPOCH_OFFSET) * ONE_DAY + timeOfDay - zoneOffset); 1077 zoneOffset -= internalGet(ZONE_OFFSET) + internalGet(DST_OFFSET); 1078 // If the time zone offset has changed, then adjust the difference. 1079 if (zoneOffset != 0) { 1080 setTimeInMillis(time + zoneOffset); 1081 long fd2 = getCurrentFixedDate(); 1082 // If the adjustment has changed the date, then take 1083 // the previous one. 1084 if (fd2 != fd) { 1085 setTimeInMillis(time - zoneOffset); 1086 } 1087 } 1088 } 1089 } 1090 1091 /** 1092 * Adds or subtracts (up/down) a single unit of time on the given time 1093 * field without changing larger fields. 1094 * <p> 1095 * <em>Example</em>: Consider a <code>GregorianCalendar</code> 1096 * originally set to December 31, 1999. Calling {@link #roll(int,boolean) roll(Calendar.MONTH, true)} 1097 * sets the calendar to January 31, 1999. The <code>YEAR</code> field is unchanged 1098 * because it is a larger field than <code>MONTH</code>.</p> 1099 * 1100 * @param up indicates if the value of the specified calendar field is to be 1101 * rolled up or rolled down. Use <code>true</code> if rolling up, <code>false</code> otherwise. 1102 * @exception IllegalArgumentException if <code>field</code> is 1103 * <code>ZONE_OFFSET</code>, <code>DST_OFFSET</code>, or unknown, 1104 * or if any calendar fields have out-of-range values in 1105 * non-lenient mode. 1106 * @see #add(int,int) 1107 * @see #set(int,int) 1108 */ 1109 @Override 1110 public void roll(int field, boolean up) { 1111 roll(field, up ? +1 : -1); 1112 } 1113 1114 /** 1115 * Adds a signed amount to the specified calendar field without changing larger fields. 1116 * A negative roll amount means to subtract from field without changing 1117 * larger fields. If the specified amount is 0, this method performs nothing. 1118 * 1119 * <p>This method calls {@link #complete()} before adding the 1120 * amount so that all the calendar fields are normalized. If there 1121 * is any calendar field having an out-of-range value in non-lenient mode, then an 1122 * <code>IllegalArgumentException</code> is thrown. 1123 * 1124 * <p> 1125 * <em>Example</em>: Consider a <code>GregorianCalendar</code> 1126 * originally set to August 31, 1999. Calling <code>roll(Calendar.MONTH, 1127 * 8)</code> sets the calendar to April 30, <strong>1999</strong>. Using a 1128 * <code>GregorianCalendar</code>, the <code>DAY_OF_MONTH</code> field cannot 1129 * be 31 in the month April. <code>DAY_OF_MONTH</code> is set to the closest possible 1130 * value, 30. The <code>YEAR</code> field maintains the value of 1999 because it 1131 * is a larger field than <code>MONTH</code>. 1132 * <p> 1133 * <em>Example</em>: Consider a <code>GregorianCalendar</code> 1134 * originally set to Sunday June 6, 1999. Calling 1135 * <code>roll(Calendar.WEEK_OF_MONTH, -1)</code> sets the calendar to 1136 * Tuesday June 1, 1999, whereas calling 1137 * <code>add(Calendar.WEEK_OF_MONTH, -1)</code> sets the calendar to 1138 * Sunday May 30, 1999. This is because the roll rule imposes an 1139 * additional constraint: The <code>MONTH</code> must not change when the 1140 * <code>WEEK_OF_MONTH</code> is rolled. Taken together with add rule 1, 1141 * the resultant date must be between Tuesday June 1 and Saturday June 1142 * 5. According to add rule 2, the <code>DAY_OF_WEEK</code>, an invariant 1143 * when changing the <code>WEEK_OF_MONTH</code>, is set to Tuesday, the 1144 * closest possible value to Sunday (where Sunday is the first day of the 1145 * week).</p> 1146 * 1147 * @param field the calendar field. 1148 * @param amount the signed amount to add to <code>field</code>. 1149 * @exception IllegalArgumentException if <code>field</code> is 1150 * <code>ZONE_OFFSET</code>, <code>DST_OFFSET</code>, or unknown, 1151 * or if any calendar fields have out-of-range values in 1152 * non-lenient mode. 1153 * @see #roll(int,boolean) 1154 * @see #add(int,int) 1155 * @see #set(int,int) 1156 * @since 1.2 1157 */ 1158 @Override 1159 public void roll(int field, int amount) { 1160 // If amount == 0, do nothing even the given field is out of 1161 // range. This is tested by JCK. 1162 if (amount == 0) { 1163 return; 1164 } 1165 1166 if (field < 0 || field >= ZONE_OFFSET) { 1167 throw new IllegalArgumentException(); 1168 } 1169 1170 // Sync the time and calendar fields. 1171 complete(); 1172 1173 int min = getMinimum(field); 1174 int max = getMaximum(field); 1175 1176 switch (field) { 1177 case AM_PM: 1178 case ERA: 1179 case YEAR: 1180 case MINUTE: 1181 case SECOND: 1182 case MILLISECOND: 1183 // These fields are handled simply, since they have fixed minima 1184 // and maxima. The field DAY_OF_MONTH is almost as simple. Other 1185 // fields are complicated, since the range within they must roll 1186 // varies depending on the date. 1187 break; 1188 1189 case HOUR: 1190 case HOUR_OF_DAY: 1191 { 1192 int rolledValue = getRolledValue(internalGet(field), amount, min, max); 1193 int hourOfDay = rolledValue; 1194 if (field == HOUR && internalGet(AM_PM) == PM) { 1195 hourOfDay += 12; 1196 } 1197 1198 // Create the current date/time value to perform wall-clock-based 1199 // roll. 1200 CalendarDate d = calsys.getCalendarDate(time, getZone()); 1201 d.setHours(hourOfDay); 1202 time = calsys.getTime(d); 1203 1204 // If we stay on the same wall-clock time, try the next or previous hour. 1205 if (internalGet(HOUR_OF_DAY) == d.getHours()) { 1206 hourOfDay = getRolledValue(rolledValue, amount > 0 ? +1 : -1, min, max); 1207 if (field == HOUR && internalGet(AM_PM) == PM) { 1208 hourOfDay += 12; 1209 } 1210 d.setHours(hourOfDay); 1211 time = calsys.getTime(d); 1212 } 1213 // Get the new hourOfDay value which might have changed due to a DST transition. 1214 hourOfDay = d.getHours(); 1215 // Update the hour related fields 1216 internalSet(HOUR_OF_DAY, hourOfDay); 1217 internalSet(AM_PM, hourOfDay / 12); 1218 internalSet(HOUR, hourOfDay % 12); 1219 1220 // Time zone offset and/or daylight saving might have changed. 1221 int zoneOffset = d.getZoneOffset(); 1222 int saving = d.getDaylightSaving(); 1223 internalSet(ZONE_OFFSET, zoneOffset - saving); 1224 internalSet(DST_OFFSET, saving); 1225 return; 1226 } 1227 1228 case MONTH: 1229 // Rolling the month involves both pinning the final value to [0, 11] 1230 // and adjusting the DAY_OF_MONTH if necessary. We only adjust the 1231 // DAY_OF_MONTH if, after updating the MONTH field, it is illegal. 1232 // E.g., <jan31>.roll(MONTH, 1) -> <feb28> or <feb29>. 1233 { 1234 if (!isCutoverYear(cdate.getNormalizedYear())) { 1235 int mon = (internalGet(MONTH) + amount) % 12; 1236 if (mon < 0) { 1237 mon += 12; 1238 } 1239 set(MONTH, mon); 1240 1241 // Keep the day of month in the range. We don't want to spill over 1242 // into the next month; e.g., we don't want jan31 + 1 mo -> feb31 -> 1243 // mar3. 1244 int monthLen = monthLength(mon); 1245 if (internalGet(DAY_OF_MONTH) > monthLen) { 1246 set(DAY_OF_MONTH, monthLen); 1247 } 1248 } else { 1249 // We need to take care of different lengths in 1250 // year and month due to the cutover. 1251 int yearLength = getActualMaximum(MONTH) + 1; 1252 int mon = (internalGet(MONTH) + amount) % yearLength; 1253 if (mon < 0) { 1254 mon += yearLength; 1255 } 1256 set(MONTH, mon); 1257 int monthLen = getActualMaximum(DAY_OF_MONTH); 1258 if (internalGet(DAY_OF_MONTH) > monthLen) { 1259 set(DAY_OF_MONTH, monthLen); 1260 } 1261 } 1262 return; 1263 } 1264 1265 case WEEK_OF_YEAR: 1266 { 1267 int y = cdate.getNormalizedYear(); 1268 max = getActualMaximum(WEEK_OF_YEAR); 1269 set(DAY_OF_WEEK, internalGet(DAY_OF_WEEK)); 1270 int woy = internalGet(WEEK_OF_YEAR); 1271 int value = woy + amount; 1272 if (!isCutoverYear(y)) { 1273 int weekYear = getWeekYear(); 1274 if (weekYear == y) { 1275 // If the new value is in between min and max 1276 // (exclusive), then we can use the value. 1277 if (value > min && value < max) { 1278 set(WEEK_OF_YEAR, value); 1279 return; 1280 } 1281 long fd = getCurrentFixedDate(); 1282 // Make sure that the min week has the current DAY_OF_WEEK 1283 // in the calendar year 1284 long day1 = fd - (7 * (woy - min)); 1285 if (calsys.getYearFromFixedDate(day1) != y) { 1286 min++; 1287 } 1288 1289 // Make sure the same thing for the max week 1290 fd += 7 * (max - internalGet(WEEK_OF_YEAR)); 1291 if (calsys.getYearFromFixedDate(fd) != y) { 1292 max--; 1293 } 1294 } else { 1295 // When WEEK_OF_YEAR and YEAR are out of sync, 1296 // adjust woy and amount to stay in the calendar year. 1297 if (weekYear > y) { 1298 if (amount < 0) { 1299 amount++; 1300 } 1301 woy = max; 1302 } else { 1303 if (amount > 0) { 1304 amount -= woy - max; 1305 } 1306 woy = min; 1307 } 1308 } 1309 set(field, getRolledValue(woy, amount, min, max)); 1310 return; 1311 } 1312 1313 // Handle cutover here. 1314 long fd = getCurrentFixedDate(); 1315 BaseCalendar cal; 1316 if (gregorianCutoverYear == gregorianCutoverYearJulian) { 1317 cal = getCutoverCalendarSystem(); 1318 } else if (y == gregorianCutoverYear) { 1319 cal = gcal; 1320 } else { 1321 cal = getJulianCalendarSystem(); 1322 } 1323 long day1 = fd - (7 * (woy - min)); 1324 // Make sure that the min week has the current DAY_OF_WEEK 1325 if (cal.getYearFromFixedDate(day1) != y) { 1326 min++; 1327 } 1328 1329 // Make sure the same thing for the max week 1330 fd += 7 * (max - woy); 1331 cal = (fd >= gregorianCutoverDate) ? gcal : getJulianCalendarSystem(); 1332 if (cal.getYearFromFixedDate(fd) != y) { 1333 max--; 1334 } 1335 // value: the new WEEK_OF_YEAR which must be converted 1336 // to month and day of month. 1337 value = getRolledValue(woy, amount, min, max) - 1; 1338 BaseCalendar.Date d = getCalendarDate(day1 + value * 7); 1339 set(MONTH, d.getMonth() - 1); 1340 set(DAY_OF_MONTH, d.getDayOfMonth()); 1341 return; 1342 } 1343 1344 case WEEK_OF_MONTH: 1345 { 1346 boolean isCutoverYear = isCutoverYear(cdate.getNormalizedYear()); 1347 // dow: relative day of week from first day of week 1348 int dow = internalGet(DAY_OF_WEEK) - getFirstDayOfWeek(); 1349 if (dow < 0) { 1350 dow += 7; 1351 } 1352 1353 long fd = getCurrentFixedDate(); 1354 long month1; // fixed date of the first day (usually 1) of the month 1355 int monthLength; // actual month length 1356 if (isCutoverYear) { 1357 month1 = getFixedDateMonth1(cdate, fd); 1358 monthLength = actualMonthLength(); 1359 } else { 1360 month1 = fd - internalGet(DAY_OF_MONTH) + 1; 1361 monthLength = calsys.getMonthLength(cdate); 1362 } 1363 1364 // the first day of week of the month. 1365 long monthDay1st = BaseCalendar.getDayOfWeekDateOnOrBefore(month1 + 6, 1366 getFirstDayOfWeek()); 1367 // if the week has enough days to form a week, the 1368 // week starts from the previous month. 1369 if ((int)(monthDay1st - month1) >= getMinimalDaysInFirstWeek()) { 1370 monthDay1st -= 7; 1371 } 1372 max = getActualMaximum(field); 1373 1374 // value: the new WEEK_OF_MONTH value 1375 int value = getRolledValue(internalGet(field), amount, 1, max) - 1; 1376 1377 // nfd: fixed date of the rolled date 1378 long nfd = monthDay1st + value * 7 + dow; 1379 1380 // Unlike WEEK_OF_YEAR, we need to change day of week if the 1381 // nfd is out of the month. 1382 if (nfd < month1) { 1383 nfd = month1; 1384 } else if (nfd >= (month1 + monthLength)) { 1385 nfd = month1 + monthLength - 1; 1386 } 1387 int dayOfMonth; 1388 if (isCutoverYear) { 1389 // If we are in the cutover year, convert nfd to 1390 // its calendar date and use dayOfMonth. 1391 BaseCalendar.Date d = getCalendarDate(nfd); 1392 dayOfMonth = d.getDayOfMonth(); 1393 } else { 1394 dayOfMonth = (int)(nfd - month1) + 1; 1395 } 1396 set(DAY_OF_MONTH, dayOfMonth); 1397 return; 1398 } 1399 1400 case DAY_OF_MONTH: 1401 { 1402 if (!isCutoverYear(cdate.getNormalizedYear())) { 1403 max = calsys.getMonthLength(cdate); 1404 break; 1405 } 1406 1407 // Cutover year handling 1408 long fd = getCurrentFixedDate(); 1409 long month1 = getFixedDateMonth1(cdate, fd); 1410 // It may not be a regular month. Convert the date and range to 1411 // the relative values, perform the roll, and 1412 // convert the result back to the rolled date. 1413 int value = getRolledValue((int)(fd - month1), amount, 0, actualMonthLength() - 1); 1414 BaseCalendar.Date d = getCalendarDate(month1 + value); 1415 assert d.getMonth()-1 == internalGet(MONTH); 1416 set(DAY_OF_MONTH, d.getDayOfMonth()); 1417 return; 1418 } 1419 1420 case DAY_OF_YEAR: 1421 { 1422 max = getActualMaximum(field); 1423 if (!isCutoverYear(cdate.getNormalizedYear())) { 1424 break; 1425 } 1426 1427 // Handle cutover here. 1428 long fd = getCurrentFixedDate(); 1429 long jan1 = fd - internalGet(DAY_OF_YEAR) + 1; 1430 int value = getRolledValue((int)(fd - jan1) + 1, amount, min, max); 1431 BaseCalendar.Date d = getCalendarDate(jan1 + value - 1); 1432 set(MONTH, d.getMonth() - 1); 1433 set(DAY_OF_MONTH, d.getDayOfMonth()); 1434 return; 1435 } 1436 1437 case DAY_OF_WEEK: 1438 { 1439 if (!isCutoverYear(cdate.getNormalizedYear())) { 1440 // If the week of year is in the same year, we can 1441 // just change DAY_OF_WEEK. 1442 int weekOfYear = internalGet(WEEK_OF_YEAR); 1443 if (weekOfYear > 1 && weekOfYear < 52) { 1444 set(WEEK_OF_YEAR, weekOfYear); // update stamp[WEEK_OF_YEAR] 1445 max = SATURDAY; 1446 break; 1447 } 1448 } 1449 1450 // We need to handle it in a different way around year 1451 // boundaries and in the cutover year. Note that 1452 // changing era and year values violates the roll 1453 // rule: not changing larger calendar fields... 1454 amount %= 7; 1455 if (amount == 0) { 1456 return; 1457 } 1458 long fd = getCurrentFixedDate(); 1459 long dowFirst = BaseCalendar.getDayOfWeekDateOnOrBefore(fd, getFirstDayOfWeek()); 1460 fd += amount; 1461 if (fd < dowFirst) { 1462 fd += 7; 1463 } else if (fd >= dowFirst + 7) { 1464 fd -= 7; 1465 } 1466 BaseCalendar.Date d = getCalendarDate(fd); 1467 set(ERA, (d.getNormalizedYear() <= 0 ? BCE : CE)); 1468 set(d.getYear(), d.getMonth() - 1, d.getDayOfMonth()); 1469 return; 1470 } 1471 1472 case DAY_OF_WEEK_IN_MONTH: 1473 { 1474 min = 1; // after normalized, min should be 1. 1475 if (!isCutoverYear(cdate.getNormalizedYear())) { 1476 int dom = internalGet(DAY_OF_MONTH); 1477 int monthLength = calsys.getMonthLength(cdate); 1478 int lastDays = monthLength % 7; 1479 max = monthLength / 7; 1480 int x = (dom - 1) % 7; 1481 if (x < lastDays) { 1482 max++; 1483 } 1484 set(DAY_OF_WEEK, internalGet(DAY_OF_WEEK)); 1485 break; 1486 } 1487 1488 // Cutover year handling 1489 long fd = getCurrentFixedDate(); 1490 long month1 = getFixedDateMonth1(cdate, fd); 1491 int monthLength = actualMonthLength(); 1492 int lastDays = monthLength % 7; 1493 max = monthLength / 7; 1494 int x = (int)(fd - month1) % 7; 1495 if (x < lastDays) { 1496 max++; 1497 } 1498 int value = getRolledValue(internalGet(field), amount, min, max) - 1; 1499 fd = month1 + value * 7 + x; 1500 BaseCalendar cal = (fd >= gregorianCutoverDate) ? gcal : getJulianCalendarSystem(); 1501 BaseCalendar.Date d = (BaseCalendar.Date) cal.newCalendarDate(TimeZone.NO_TIMEZONE); 1502 cal.getCalendarDateFromFixedDate(d, fd); 1503 set(DAY_OF_MONTH, d.getDayOfMonth()); 1504 return; 1505 } 1506 } 1507 1508 set(field, getRolledValue(internalGet(field), amount, min, max)); 1509 } 1510 1511 /** 1512 * Returns the minimum value for the given calendar field of this 1513 * <code>GregorianCalendar</code> instance. The minimum value is 1514 * defined as the smallest value returned by the {@link 1515 * Calendar#get(int) get} method for any possible time value, 1516 * taking into consideration the current values of the 1517 * {@link Calendar#getFirstDayOfWeek() getFirstDayOfWeek}, 1518 * {@link Calendar#getMinimalDaysInFirstWeek() getMinimalDaysInFirstWeek}, 1519 * {@link #getGregorianChange() getGregorianChange} and 1520 * {@link Calendar#getTimeZone() getTimeZone} methods. 1521 * 1522 * @param field the calendar field. 1523 * @return the minimum value for the given calendar field. 1524 * @see #getMaximum(int) 1525 * @see #getGreatestMinimum(int) 1526 * @see #getLeastMaximum(int) 1527 * @see #getActualMinimum(int) 1528 * @see #getActualMaximum(int) 1529 */ 1530 @Override 1531 public int getMinimum(int field) { 1532 return MIN_VALUES[field]; 1533 } 1534 1535 /** 1536 * Returns the maximum value for the given calendar field of this 1537 * <code>GregorianCalendar</code> instance. The maximum value is 1538 * defined as the largest value returned by the {@link 1539 * Calendar#get(int) get} method for any possible time value, 1540 * taking into consideration the current values of the 1541 * {@link Calendar#getFirstDayOfWeek() getFirstDayOfWeek}, 1542 * {@link Calendar#getMinimalDaysInFirstWeek() getMinimalDaysInFirstWeek}, 1543 * {@link #getGregorianChange() getGregorianChange} and 1544 * {@link Calendar#getTimeZone() getTimeZone} methods. 1545 * 1546 * @param field the calendar field. 1547 * @return the maximum value for the given calendar field. 1548 * @see #getMinimum(int) 1549 * @see #getGreatestMinimum(int) 1550 * @see #getLeastMaximum(int) 1551 * @see #getActualMinimum(int) 1552 * @see #getActualMaximum(int) 1553 */ 1554 @Override 1555 public int getMaximum(int field) { 1556 switch (field) { 1557 case MONTH: 1558 case DAY_OF_MONTH: 1559 case DAY_OF_YEAR: 1560 case WEEK_OF_YEAR: 1561 case WEEK_OF_MONTH: 1562 case DAY_OF_WEEK_IN_MONTH: 1563 case YEAR: 1564 { 1565 // On or after Gregorian 200-3-1, Julian and Gregorian 1566 // calendar dates are the same or Gregorian dates are 1567 // larger (i.e., there is a "gap") after 300-3-1. 1568 if (gregorianCutoverYear > 200) { 1569 break; 1570 } 1571 // There might be "overlapping" dates. 1572 GregorianCalendar gc = (GregorianCalendar) clone(); 1573 gc.setLenient(true); 1574 gc.setTimeInMillis(gregorianCutover); 1575 int v1 = gc.getActualMaximum(field); 1576 gc.setTimeInMillis(gregorianCutover-1); 1577 int v2 = gc.getActualMaximum(field); 1578 return Math.max(MAX_VALUES[field], Math.max(v1, v2)); 1579 } 1580 } 1581 return MAX_VALUES[field]; 1582 } 1583 1584 /** 1585 * Returns the highest minimum value for the given calendar field 1586 * of this <code>GregorianCalendar</code> instance. The highest 1587 * minimum value is defined as the largest value returned by 1588 * {@link #getActualMinimum(int)} for any possible time value, 1589 * taking into consideration the current values of the 1590 * {@link Calendar#getFirstDayOfWeek() getFirstDayOfWeek}, 1591 * {@link Calendar#getMinimalDaysInFirstWeek() getMinimalDaysInFirstWeek}, 1592 * {@link #getGregorianChange() getGregorianChange} and 1593 * {@link Calendar#getTimeZone() getTimeZone} methods. 1594 * 1595 * @param field the calendar field. 1596 * @return the highest minimum value for the given calendar field. 1597 * @see #getMinimum(int) 1598 * @see #getMaximum(int) 1599 * @see #getLeastMaximum(int) 1600 * @see #getActualMinimum(int) 1601 * @see #getActualMaximum(int) 1602 */ 1603 @Override 1604 public int getGreatestMinimum(int field) { 1605 if (field == DAY_OF_MONTH) { 1606 BaseCalendar.Date d = getGregorianCutoverDate(); 1607 long mon1 = getFixedDateMonth1(d, gregorianCutoverDate); 1608 d = getCalendarDate(mon1); 1609 return Math.max(MIN_VALUES[field], d.getDayOfMonth()); 1610 } 1611 return MIN_VALUES[field]; 1612 } 1613 1614 /** 1615 * Returns the lowest maximum value for the given calendar field 1616 * of this <code>GregorianCalendar</code> instance. The lowest 1617 * maximum value is defined as the smallest value returned by 1618 * {@link #getActualMaximum(int)} for any possible time value, 1619 * taking into consideration the current values of the 1620 * {@link Calendar#getFirstDayOfWeek() getFirstDayOfWeek}, 1621 * {@link Calendar#getMinimalDaysInFirstWeek() getMinimalDaysInFirstWeek}, 1622 * {@link #getGregorianChange() getGregorianChange} and 1623 * {@link Calendar#getTimeZone() getTimeZone} methods. 1624 * 1625 * @param field the calendar field 1626 * @return the lowest maximum value for the given calendar field. 1627 * @see #getMinimum(int) 1628 * @see #getMaximum(int) 1629 * @see #getGreatestMinimum(int) 1630 * @see #getActualMinimum(int) 1631 * @see #getActualMaximum(int) 1632 */ 1633 @Override 1634 public int getLeastMaximum(int field) { 1635 switch (field) { 1636 case MONTH: 1637 case DAY_OF_MONTH: 1638 case DAY_OF_YEAR: 1639 case WEEK_OF_YEAR: 1640 case WEEK_OF_MONTH: 1641 case DAY_OF_WEEK_IN_MONTH: 1642 case YEAR: 1643 { 1644 GregorianCalendar gc = (GregorianCalendar) clone(); 1645 gc.setLenient(true); 1646 gc.setTimeInMillis(gregorianCutover); 1647 int v1 = gc.getActualMaximum(field); 1648 gc.setTimeInMillis(gregorianCutover-1); 1649 int v2 = gc.getActualMaximum(field); 1650 return Math.min(LEAST_MAX_VALUES[field], Math.min(v1, v2)); 1651 } 1652 } 1653 return LEAST_MAX_VALUES[field]; 1654 } 1655 1656 /** 1657 * Returns the minimum value that this calendar field could have, 1658 * taking into consideration the given time value and the current 1659 * values of the 1660 * {@link Calendar#getFirstDayOfWeek() getFirstDayOfWeek}, 1661 * {@link Calendar#getMinimalDaysInFirstWeek() getMinimalDaysInFirstWeek}, 1662 * {@link #getGregorianChange() getGregorianChange} and 1663 * {@link Calendar#getTimeZone() getTimeZone} methods. 1664 * 1665 * <p>For example, if the Gregorian change date is January 10, 1666 * 1970 and the date of this <code>GregorianCalendar</code> is 1667 * January 20, 1970, the actual minimum value of the 1668 * <code>DAY_OF_MONTH</code> field is 10 because the previous date 1669 * of January 10, 1970 is December 27, 1996 (in the Julian 1670 * calendar). Therefore, December 28, 1969 to January 9, 1970 1671 * don't exist. 1672 * 1673 * @param field the calendar field 1674 * @return the minimum of the given field for the time value of 1675 * this <code>GregorianCalendar</code> 1676 * @see #getMinimum(int) 1677 * @see #getMaximum(int) 1678 * @see #getGreatestMinimum(int) 1679 * @see #getLeastMaximum(int) 1680 * @see #getActualMaximum(int) 1681 * @since 1.2 1682 */ 1683 @Override 1684 public int getActualMinimum(int field) { 1685 if (field == DAY_OF_MONTH) { 1686 GregorianCalendar gc = getNormalizedCalendar(); 1687 int year = gc.cdate.getNormalizedYear(); 1688 if (year == gregorianCutoverYear || year == gregorianCutoverYearJulian) { 1689 long month1 = getFixedDateMonth1(gc.cdate, gc.calsys.getFixedDate(gc.cdate)); 1690 BaseCalendar.Date d = getCalendarDate(month1); 1691 return d.getDayOfMonth(); 1692 } 1693 } 1694 return getMinimum(field); 1695 } 1696 1697 /** 1698 * Returns the maximum value that this calendar field could have, 1699 * taking into consideration the given time value and the current 1700 * values of the 1701 * {@link Calendar#getFirstDayOfWeek() getFirstDayOfWeek}, 1702 * {@link Calendar#getMinimalDaysInFirstWeek() getMinimalDaysInFirstWeek}, 1703 * {@link #getGregorianChange() getGregorianChange} and 1704 * {@link Calendar#getTimeZone() getTimeZone} methods. 1705 * For example, if the date of this instance is February 1, 2004, 1706 * the actual maximum value of the <code>DAY_OF_MONTH</code> field 1707 * is 29 because 2004 is a leap year, and if the date of this 1708 * instance is February 1, 2005, it's 28. 1709 * 1710 * <p>This method calculates the maximum value of {@link 1711 * Calendar#WEEK_OF_YEAR WEEK_OF_YEAR} based on the {@link 1712 * Calendar#YEAR YEAR} (calendar year) value, not the <a 1713 * href="#week_year">week year</a>. Call {@link 1714 * #getWeeksInWeekYear()} to get the maximum value of {@code 1715 * WEEK_OF_YEAR} in the week year of this {@code GregorianCalendar}. 1716 * 1717 * @param field the calendar field 1718 * @return the maximum of the given field for the time value of 1719 * this <code>GregorianCalendar</code> 1720 * @see #getMinimum(int) 1721 * @see #getMaximum(int) 1722 * @see #getGreatestMinimum(int) 1723 * @see #getLeastMaximum(int) 1724 * @see #getActualMinimum(int) 1725 * @since 1.2 1726 */ 1727 @Override 1728 public int getActualMaximum(int field) { 1729 final int fieldsForFixedMax = ERA_MASK|DAY_OF_WEEK_MASK|HOUR_MASK|AM_PM_MASK| 1730 HOUR_OF_DAY_MASK|MINUTE_MASK|SECOND_MASK|MILLISECOND_MASK| 1731 ZONE_OFFSET_MASK|DST_OFFSET_MASK; 1732 if ((fieldsForFixedMax & (1<<field)) != 0) { 1733 return getMaximum(field); 1734 } 1735 1736 GregorianCalendar gc = getNormalizedCalendar(); 1737 BaseCalendar.Date date = gc.cdate; 1738 BaseCalendar cal = gc.calsys; 1739 int normalizedYear = date.getNormalizedYear(); 1740 1741 int value = -1; 1742 switch (field) { 1743 case MONTH: 1744 { 1745 if (!gc.isCutoverYear(normalizedYear)) { 1746 value = DECEMBER; 1747 break; 1748 } 1749 1750 // January 1 of the next year may or may not exist. 1751 long nextJan1; 1752 do { 1753 nextJan1 = gcal.getFixedDate(++normalizedYear, BaseCalendar.JANUARY, 1, null); 1754 } while (nextJan1 < gregorianCutoverDate); 1755 BaseCalendar.Date d = (BaseCalendar.Date) date.clone(); 1756 cal.getCalendarDateFromFixedDate(d, nextJan1 - 1); 1757 value = d.getMonth() - 1; 1758 } 1759 break; 1760 1761 case DAY_OF_MONTH: 1762 { 1763 value = cal.getMonthLength(date); 1764 if (!gc.isCutoverYear(normalizedYear) || date.getDayOfMonth() == value) { 1765 break; 1766 } 1767 1768 // Handle cutover year. 1769 long fd = gc.getCurrentFixedDate(); 1770 if (fd >= gregorianCutoverDate) { 1771 break; 1772 } 1773 int monthLength = gc.actualMonthLength(); 1774 long monthEnd = gc.getFixedDateMonth1(gc.cdate, fd) + monthLength - 1; 1775 // Convert the fixed date to its calendar date. 1776 BaseCalendar.Date d = gc.getCalendarDate(monthEnd); 1777 value = d.getDayOfMonth(); 1778 } 1779 break; 1780 1781 case DAY_OF_YEAR: 1782 { 1783 if (!gc.isCutoverYear(normalizedYear)) { 1784 value = cal.getYearLength(date); 1785 break; 1786 } 1787 1788 // Handle cutover year. 1789 long jan1; 1790 if (gregorianCutoverYear == gregorianCutoverYearJulian) { 1791 BaseCalendar cocal = gc.getCutoverCalendarSystem(); 1792 jan1 = cocal.getFixedDate(normalizedYear, 1, 1, null); 1793 } else if (normalizedYear == gregorianCutoverYearJulian) { 1794 jan1 = cal.getFixedDate(normalizedYear, 1, 1, null); 1795 } else { 1796 jan1 = gregorianCutoverDate; 1797 } 1798 // January 1 of the next year may or may not exist. 1799 long nextJan1 = gcal.getFixedDate(++normalizedYear, 1, 1, null); 1800 if (nextJan1 < gregorianCutoverDate) { 1801 nextJan1 = gregorianCutoverDate; 1802 } 1803 assert jan1 <= cal.getFixedDate(date.getNormalizedYear(), date.getMonth(), 1804 date.getDayOfMonth(), date); 1805 assert nextJan1 >= cal.getFixedDate(date.getNormalizedYear(), date.getMonth(), 1806 date.getDayOfMonth(), date); 1807 value = (int)(nextJan1 - jan1); 1808 } 1809 break; 1810 1811 case WEEK_OF_YEAR: 1812 { 1813 if (!gc.isCutoverYear(normalizedYear)) { 1814 // Get the day of week of January 1 of the year 1815 CalendarDate d = cal.newCalendarDate(TimeZone.NO_TIMEZONE); 1816 d.setDate(date.getYear(), BaseCalendar.JANUARY, 1); 1817 int dayOfWeek = cal.getDayOfWeek(d); 1818 // Normalize the day of week with the firstDayOfWeek value 1819 dayOfWeek -= getFirstDayOfWeek(); 1820 if (dayOfWeek < 0) { 1821 dayOfWeek += 7; 1822 } 1823 value = 52; 1824 int magic = dayOfWeek + getMinimalDaysInFirstWeek() - 1; 1825 if ((magic == 6) || 1826 (date.isLeapYear() && (magic == 5 || magic == 12))) { 1827 value++; 1828 } 1829 break; 1830 } 1831 1832 if (gc == this) { 1833 gc = (GregorianCalendar) gc.clone(); 1834 } 1835 int maxDayOfYear = getActualMaximum(DAY_OF_YEAR); 1836 gc.set(DAY_OF_YEAR, maxDayOfYear); 1837 value = gc.get(WEEK_OF_YEAR); 1838 if (internalGet(YEAR) != gc.getWeekYear()) { 1839 gc.set(DAY_OF_YEAR, maxDayOfYear - 7); 1840 value = gc.get(WEEK_OF_YEAR); 1841 } 1842 } 1843 break; 1844 1845 case WEEK_OF_MONTH: 1846 { 1847 if (!gc.isCutoverYear(normalizedYear)) { 1848 CalendarDate d = cal.newCalendarDate(null); 1849 d.setDate(date.getYear(), date.getMonth(), 1); 1850 int dayOfWeek = cal.getDayOfWeek(d); 1851 int monthLength = cal.getMonthLength(d); 1852 dayOfWeek -= getFirstDayOfWeek(); 1853 if (dayOfWeek < 0) { 1854 dayOfWeek += 7; 1855 } 1856 int nDaysFirstWeek = 7 - dayOfWeek; // # of days in the first week 1857 value = 3; 1858 if (nDaysFirstWeek >= getMinimalDaysInFirstWeek()) { 1859 value++; 1860 } 1861 monthLength -= nDaysFirstWeek + 7 * 3; 1862 if (monthLength > 0) { 1863 value++; 1864 if (monthLength > 7) { 1865 value++; 1866 } 1867 } 1868 break; 1869 } 1870 1871 // Cutover year handling 1872 if (gc == this) { 1873 gc = (GregorianCalendar) gc.clone(); 1874 } 1875 int y = gc.internalGet(YEAR); 1876 int m = gc.internalGet(MONTH); 1877 do { 1878 value = gc.get(WEEK_OF_MONTH); 1879 gc.add(WEEK_OF_MONTH, +1); 1880 } while (gc.get(YEAR) == y && gc.get(MONTH) == m); 1881 } 1882 break; 1883 1884 case DAY_OF_WEEK_IN_MONTH: 1885 { 1886 // may be in the Gregorian cutover month 1887 int ndays, dow1; 1888 int dow = date.getDayOfWeek(); 1889 if (!gc.isCutoverYear(normalizedYear)) { 1890 BaseCalendar.Date d = (BaseCalendar.Date) date.clone(); 1891 ndays = cal.getMonthLength(d); 1892 d.setDayOfMonth(1); 1893 cal.normalize(d); 1894 dow1 = d.getDayOfWeek(); 1895 } else { 1896 // Let a cloned GregorianCalendar take care of the cutover cases. 1897 if (gc == this) { 1898 gc = (GregorianCalendar) clone(); 1899 } 1900 ndays = gc.actualMonthLength(); 1901 gc.set(DAY_OF_MONTH, gc.getActualMinimum(DAY_OF_MONTH)); 1902 dow1 = gc.get(DAY_OF_WEEK); 1903 } 1904 int x = dow - dow1; 1905 if (x < 0) { 1906 x += 7; 1907 } 1908 ndays -= x; 1909 value = (ndays + 6) / 7; 1910 } 1911 break; 1912 1913 case YEAR: 1914 /* The year computation is no different, in principle, from the 1915 * others, however, the range of possible maxima is large. In 1916 * addition, the way we know we've exceeded the range is different. 1917 * For these reasons, we use the special case code below to handle 1918 * this field. 1919 * 1920 * The actual maxima for YEAR depend on the type of calendar: 1921 * 1922 * Gregorian = May 17, 292275056 BCE - Aug 17, 292278994 CE 1923 * Julian = Dec 2, 292269055 BCE - Jan 3, 292272993 CE 1924 * Hybrid = Dec 2, 292269055 BCE - Aug 17, 292278994 CE 1925 * 1926 * We know we've exceeded the maximum when either the month, date, 1927 * time, or era changes in response to setting the year. We don't 1928 * check for month, date, and time here because the year and era are 1929 * sufficient to detect an invalid year setting. NOTE: If code is 1930 * added to check the month and date in the future for some reason, 1931 * Feb 29 must be allowed to shift to Mar 1 when setting the year. 1932 */ 1933 { 1934 if (gc == this) { 1935 gc = (GregorianCalendar) clone(); 1936 } 1937 1938 // Calculate the millisecond offset from the beginning 1939 // of the year of this calendar and adjust the max 1940 // year value if we are beyond the limit in the max 1941 // year. 1942 long current = gc.getYearOffsetInMillis(); 1943 1944 if (gc.internalGetEra() == CE) { 1945 gc.setTimeInMillis(Long.MAX_VALUE); 1946 value = gc.get(YEAR); 1947 long maxEnd = gc.getYearOffsetInMillis(); 1948 if (current > maxEnd) { 1949 value--; 1950 } 1951 } else { 1952 CalendarSystem mincal = gc.getTimeInMillis() >= gregorianCutover ? 1953 gcal : getJulianCalendarSystem(); 1954 CalendarDate d = mincal.getCalendarDate(Long.MIN_VALUE, getZone()); 1955 long maxEnd = (cal.getDayOfYear(d) - 1) * 24 + d.getHours(); 1956 maxEnd *= 60; 1957 maxEnd += d.getMinutes(); 1958 maxEnd *= 60; 1959 maxEnd += d.getSeconds(); 1960 maxEnd *= 1000; 1961 maxEnd += d.getMillis(); 1962 value = d.getYear(); 1963 if (value <= 0) { 1964 assert mincal == gcal; 1965 value = 1 - value; 1966 } 1967 if (current < maxEnd) { 1968 value--; 1969 } 1970 } 1971 } 1972 break; 1973 1974 default: 1975 throw new ArrayIndexOutOfBoundsException(field); 1976 } 1977 return value; 1978 } 1979 1980 /** 1981 * Returns the millisecond offset from the beginning of this 1982 * year. This Calendar object must have been normalized. 1983 */ 1984 private long getYearOffsetInMillis() { 1985 long t = (internalGet(DAY_OF_YEAR) - 1) * 24; 1986 t += internalGet(HOUR_OF_DAY); 1987 t *= 60; 1988 t += internalGet(MINUTE); 1989 t *= 60; 1990 t += internalGet(SECOND); 1991 t *= 1000; 1992 return t + internalGet(MILLISECOND) - 1993 (internalGet(ZONE_OFFSET) + internalGet(DST_OFFSET)); 1994 } 1995 1996 @Override 1997 public Object clone() 1998 { 1999 GregorianCalendar other = (GregorianCalendar) super.clone(); 2000 2001 other.gdate = (BaseCalendar.Date) gdate.clone(); 2002 if (cdate != null) { 2003 if (cdate != gdate) { 2004 other.cdate = (BaseCalendar.Date) cdate.clone(); 2005 } else { 2006 other.cdate = other.gdate; 2007 } 2008 } 2009 other.originalFields = null; 2010 other.zoneOffsets = null; 2011 return other; 2012 } 2013 2014 @Override 2015 public TimeZone getTimeZone() { 2016 TimeZone zone = super.getTimeZone(); 2017 // To share the zone by CalendarDates 2018 gdate.setZone(zone); 2019 if (cdate != null && cdate != gdate) { 2020 cdate.setZone(zone); 2021 } 2022 return zone; 2023 } 2024 2025 @Override 2026 public void setTimeZone(TimeZone zone) { 2027 super.setTimeZone(zone); 2028 // To share the zone by CalendarDates 2029 gdate.setZone(zone); 2030 if (cdate != null && cdate != gdate) { 2031 cdate.setZone(zone); 2032 } 2033 } 2034 2035 /** 2036 * Returns {@code true} indicating this {@code GregorianCalendar} 2037 * supports week dates. 2038 * 2039 * @return {@code true} (always) 2040 * @see #getWeekYear() 2041 * @see #setWeekDate(int,int,int) 2042 * @see #getWeeksInWeekYear() 2043 * @since 1.7 2044 */ 2045 @Override 2046 public final boolean isWeekDateSupported() { 2047 return true; 2048 } 2049 2050 /** 2051 * Returns the <a href="#week_year">week year</a> represented by this 2052 * {@code GregorianCalendar}. The dates in the weeks between 1 and the 2053 * maximum week number of the week year have the same week year value 2054 * that may be one year before or after the {@link Calendar#YEAR YEAR} 2055 * (calendar year) value. 2056 * 2057 * <p>This method calls {@link Calendar#complete()} before 2058 * calculating the week year. 2059 * 2060 * @return the week year represented by this {@code GregorianCalendar}. 2061 * If the {@link Calendar#ERA ERA} value is {@link #BC}, the year is 2062 * represented by 0 or a negative number: BC 1 is 0, BC 2 2063 * is -1, BC 3 is -2, and so on. 2064 * @throws IllegalArgumentException 2065 * if any of the calendar fields is invalid in non-lenient mode. 2066 * @see #isWeekDateSupported() 2067 * @see #getWeeksInWeekYear() 2068 * @see Calendar#getFirstDayOfWeek() 2069 * @see Calendar#getMinimalDaysInFirstWeek() 2070 * @since 1.7 2071 */ 2072 @Override 2073 public int getWeekYear() { 2074 int year = get(YEAR); // implicitly calls complete() 2075 if (internalGetEra() == BCE) { 2076 year = 1 - year; 2077 } 2078 2079 // Fast path for the Gregorian calendar years that are never 2080 // affected by the Julian-Gregorian transition 2081 if (year > gregorianCutoverYear + 1) { 2082 int weekOfYear = internalGet(WEEK_OF_YEAR); 2083 if (internalGet(MONTH) == JANUARY) { 2084 if (weekOfYear >= 52) { 2085 --year; 2086 } 2087 } else { 2088 if (weekOfYear == 1) { 2089 ++year; 2090 } 2091 } 2092 return year; 2093 } 2094 2095 // General (slow) path 2096 int dayOfYear = internalGet(DAY_OF_YEAR); 2097 int maxDayOfYear = getActualMaximum(DAY_OF_YEAR); 2098 int minimalDays = getMinimalDaysInFirstWeek(); 2099 2100 // Quickly check the possibility of year adjustments before 2101 // cloning this GregorianCalendar. 2102 if (dayOfYear > minimalDays && dayOfYear < (maxDayOfYear - 6)) { 2103 return year; 2104 } 2105 2106 // Create a clone to work on the calculation 2107 GregorianCalendar cal = (GregorianCalendar) clone(); 2108 cal.setLenient(true); 2109 // Use GMT so that intermediate date calculations won't 2110 // affect the time of day fields. 2111 cal.setTimeZone(TimeZone.getTimeZone("GMT")); 2112 // Go to the first day of the year, which is usually January 1. 2113 cal.set(DAY_OF_YEAR, 1); 2114 cal.complete(); 2115 2116 // Get the first day of the first day-of-week in the year. 2117 int delta = getFirstDayOfWeek() - cal.get(DAY_OF_WEEK); 2118 if (delta != 0) { 2119 if (delta < 0) { 2120 delta += 7; 2121 } 2122 cal.add(DAY_OF_YEAR, delta); 2123 } 2124 int minDayOfYear = cal.get(DAY_OF_YEAR); 2125 if (dayOfYear < minDayOfYear) { 2126 if (minDayOfYear <= minimalDays) { 2127 --year; 2128 } 2129 } else { 2130 cal.set(YEAR, year + 1); 2131 cal.set(DAY_OF_YEAR, 1); 2132 cal.complete(); 2133 int del = getFirstDayOfWeek() - cal.get(DAY_OF_WEEK); 2134 if (del != 0) { 2135 if (del < 0) { 2136 del += 7; 2137 } 2138 cal.add(DAY_OF_YEAR, del); 2139 } 2140 minDayOfYear = cal.get(DAY_OF_YEAR) - 1; 2141 if (minDayOfYear == 0) { 2142 minDayOfYear = 7; 2143 } 2144 if (minDayOfYear >= minimalDays) { 2145 int days = maxDayOfYear - dayOfYear + 1; 2146 if (days <= (7 - minDayOfYear)) { 2147 ++year; 2148 } 2149 } 2150 } 2151 return year; 2152 } 2153 2154 /** 2155 * Sets this {@code GregorianCalendar} to the date given by the 2156 * date specifiers - <a href="#week_year">{@code weekYear}</a>, 2157 * {@code weekOfYear}, and {@code dayOfWeek}. {@code weekOfYear} 2158 * follows the <a href="#week_and_year">{@code WEEK_OF_YEAR} 2159 * numbering</a>. The {@code dayOfWeek} value must be one of the 2160 * {@link Calendar#DAY_OF_WEEK DAY_OF_WEEK} values: {@link 2161 * Calendar#SUNDAY SUNDAY} to {@link Calendar#SATURDAY SATURDAY}. 2162 * 2163 * <p>Note that the numeric day-of-week representation differs from 2164 * the ISO 8601 standard, and that the {@code weekOfYear} 2165 * numbering is compatible with the standard when {@code 2166 * getFirstDayOfWeek()} is {@code MONDAY} and {@code 2167 * getMinimalDaysInFirstWeek()} is 4. 2168 * 2169 * <p>Unlike the {@code set} method, all of the calendar fields 2170 * and the instant of time value are calculated upon return. 2171 * 2172 * <p>If {@code weekOfYear} is out of the valid week-of-year 2173 * range in {@code weekYear}, the {@code weekYear} 2174 * and {@code weekOfYear} values are adjusted in lenient 2175 * mode, or an {@code IllegalArgumentException} is thrown in 2176 * non-lenient mode. 2177 * 2178 * @param weekYear the week year 2179 * @param weekOfYear the week number based on {@code weekYear} 2180 * @param dayOfWeek the day of week value: one of the constants 2181 * for the {@link #DAY_OF_WEEK DAY_OF_WEEK} field: 2182 * {@link Calendar#SUNDAY SUNDAY}, ..., 2183 * {@link Calendar#SATURDAY SATURDAY}. 2184 * @exception IllegalArgumentException 2185 * if any of the given date specifiers is invalid, 2186 * or if any of the calendar fields are inconsistent 2187 * with the given date specifiers in non-lenient mode 2188 * @see GregorianCalendar#isWeekDateSupported() 2189 * @see Calendar#getFirstDayOfWeek() 2190 * @see Calendar#getMinimalDaysInFirstWeek() 2191 * @since 1.7 2192 */ 2193 @Override 2194 public void setWeekDate(int weekYear, int weekOfYear, int dayOfWeek) { 2195 if (dayOfWeek < SUNDAY || dayOfWeek > SATURDAY) { 2196 throw new IllegalArgumentException("invalid dayOfWeek: " + dayOfWeek); 2197 } 2198 2199 // To avoid changing the time of day fields by date 2200 // calculations, use a clone with the GMT time zone. 2201 GregorianCalendar gc = (GregorianCalendar) clone(); 2202 gc.setLenient(true); 2203 int era = gc.get(ERA); 2204 gc.clear(); 2205 gc.setTimeZone(TimeZone.getTimeZone("GMT")); 2206 gc.set(ERA, era); 2207 gc.set(YEAR, weekYear); 2208 gc.set(WEEK_OF_YEAR, 1); 2209 gc.set(DAY_OF_WEEK, getFirstDayOfWeek()); 2210 int days = dayOfWeek - getFirstDayOfWeek(); 2211 if (days < 0) { 2212 days += 7; 2213 } 2214 days += 7 * (weekOfYear - 1); 2215 if (days != 0) { 2216 gc.add(DAY_OF_YEAR, days); 2217 } else { 2218 gc.complete(); 2219 } 2220 2221 if (!isLenient() && 2222 (gc.getWeekYear() != weekYear 2223 || gc.internalGet(WEEK_OF_YEAR) != weekOfYear 2224 || gc.internalGet(DAY_OF_WEEK) != dayOfWeek)) { 2225 throw new IllegalArgumentException(); 2226 } 2227 2228 set(ERA, gc.internalGet(ERA)); 2229 set(YEAR, gc.internalGet(YEAR)); 2230 set(MONTH, gc.internalGet(MONTH)); 2231 set(DAY_OF_MONTH, gc.internalGet(DAY_OF_MONTH)); 2232 2233 // to avoid throwing an IllegalArgumentException in 2234 // non-lenient, set WEEK_OF_YEAR internally 2235 internalSet(WEEK_OF_YEAR, weekOfYear); 2236 complete(); 2237 } 2238 2239 /** 2240 * Returns the number of weeks in the <a href="#week_year">week year</a> 2241 * represented by this {@code GregorianCalendar}. 2242 * 2243 * <p>For example, if this {@code GregorianCalendar}'s date is 2244 * December 31, 2008 with <a href="#iso8601_compatible_setting">the ISO 2245 * 8601 compatible setting</a>, this method will return 53 for the 2246 * period: December 29, 2008 to January 3, 2010 while {@link 2247 * #getActualMaximum(int) getActualMaximum(WEEK_OF_YEAR)} will return 2248 * 52 for the period: December 31, 2007 to December 28, 2008. 2249 * 2250 * @return the number of weeks in the week year. 2251 * @see Calendar#WEEK_OF_YEAR 2252 * @see #getWeekYear() 2253 * @see #getActualMaximum(int) 2254 * @since 1.7 2255 */ 2256 @Override 2257 public int getWeeksInWeekYear() { 2258 GregorianCalendar gc = getNormalizedCalendar(); 2259 int weekYear = gc.getWeekYear(); 2260 if (weekYear == gc.internalGet(YEAR)) { 2261 return gc.getActualMaximum(WEEK_OF_YEAR); 2262 } 2263 2264 // Use the 2nd week for calculating the max of WEEK_OF_YEAR 2265 if (gc == this) { 2266 gc = (GregorianCalendar) gc.clone(); 2267 } 2268 gc.setWeekDate(weekYear, 2, internalGet(DAY_OF_WEEK)); 2269 return gc.getActualMaximum(WEEK_OF_YEAR); 2270 } 2271 2272 ///////////////////////////// 2273 // Time => Fields computation 2274 ///////////////////////////// 2275 2276 /** 2277 * The fixed date corresponding to gdate. If the value is 2278 * Long.MIN_VALUE, the fixed date value is unknown. Currently, 2279 * Julian calendar dates are not cached. 2280 */ 2281 private transient long cachedFixedDate = Long.MIN_VALUE; 2282 2283 /** 2284 * Converts the time value (millisecond offset from the <a 2285 * href="Calendar.html#Epoch">Epoch</a>) to calendar field values. 2286 * The time is <em>not</em> 2287 * recomputed first; to recompute the time, then the fields, call the 2288 * <code>complete</code> method. 2289 * 2290 * @see Calendar#complete 2291 */ 2292 @Override 2293 protected void computeFields() { 2294 int mask; 2295 if (isPartiallyNormalized()) { 2296 // Determine which calendar fields need to be computed. 2297 mask = getSetStateFields(); 2298 int fieldMask = ~mask & ALL_FIELDS; 2299 // We have to call computTime in case calsys == null in 2300 // order to set calsys and cdate. (6263644) 2301 if (fieldMask != 0 || calsys == null) { 2302 mask |= computeFields(fieldMask, 2303 mask & (ZONE_OFFSET_MASK|DST_OFFSET_MASK)); 2304 assert mask == ALL_FIELDS; 2305 } 2306 } else { 2307 mask = ALL_FIELDS; 2308 computeFields(mask, 0); 2309 } 2310 // After computing all the fields, set the field state to `COMPUTED'. 2311 setFieldsComputed(mask); 2312 } 2313 2314 /** 2315 * This computeFields implements the conversion from UTC 2316 * (millisecond offset from the Epoch) to calendar 2317 * field values. fieldMask specifies which fields to change the 2318 * setting state to COMPUTED, although all fields are set to 2319 * the correct values. This is required to fix 4685354. 2320 * 2321 * @param fieldMask a bit mask to specify which fields to change 2322 * the setting state. 2323 * @param tzMask a bit mask to specify which time zone offset 2324 * fields to be used for time calculations 2325 * @return a new field mask that indicates what field values have 2326 * actually been set. 2327 */ 2328 private int computeFields(int fieldMask, int tzMask) { 2329 int zoneOffset = 0; 2330 TimeZone tz = getZone(); 2331 if (zoneOffsets == null) { 2332 zoneOffsets = new int[2]; 2333 } 2334 if (tzMask != (ZONE_OFFSET_MASK|DST_OFFSET_MASK)) { 2335 if (tz instanceof ZoneInfo) { 2336 zoneOffset = ((ZoneInfo)tz).getOffsets(time, zoneOffsets); 2337 } else { 2338 zoneOffset = tz.getOffset(time); 2339 zoneOffsets[0] = tz.getRawOffset(); 2340 zoneOffsets[1] = zoneOffset - zoneOffsets[0]; 2341 } 2342 } 2343 if (tzMask != 0) { 2344 if (isFieldSet(tzMask, ZONE_OFFSET)) { 2345 zoneOffsets[0] = internalGet(ZONE_OFFSET); 2346 } 2347 if (isFieldSet(tzMask, DST_OFFSET)) { 2348 zoneOffsets[1] = internalGet(DST_OFFSET); 2349 } 2350 zoneOffset = zoneOffsets[0] + zoneOffsets[1]; 2351 } 2352 2353 // By computing time and zoneOffset separately, we can take 2354 // the wider range of time+zoneOffset than the previous 2355 // implementation. 2356 long fixedDate = zoneOffset / ONE_DAY; 2357 int timeOfDay = zoneOffset % (int)ONE_DAY; 2358 fixedDate += time / ONE_DAY; 2359 timeOfDay += (int) (time % ONE_DAY); 2360 if (timeOfDay >= ONE_DAY) { 2361 timeOfDay -= ONE_DAY; 2362 ++fixedDate; 2363 } else { 2364 while (timeOfDay < 0) { 2365 timeOfDay += ONE_DAY; 2366 --fixedDate; 2367 } 2368 } 2369 fixedDate += EPOCH_OFFSET; 2370 2371 int era = CE; 2372 int year; 2373 if (fixedDate >= gregorianCutoverDate) { 2374 // Handle Gregorian dates. 2375 assert cachedFixedDate == Long.MIN_VALUE || gdate.isNormalized() 2376 : "cache control: not normalized"; 2377 assert cachedFixedDate == Long.MIN_VALUE || 2378 gcal.getFixedDate(gdate.getNormalizedYear(), 2379 gdate.getMonth(), 2380 gdate.getDayOfMonth(), gdate) 2381 == cachedFixedDate 2382 : "cache control: inconsictency" + 2383 ", cachedFixedDate=" + cachedFixedDate + 2384 ", computed=" + 2385 gcal.getFixedDate(gdate.getNormalizedYear(), 2386 gdate.getMonth(), 2387 gdate.getDayOfMonth(), 2388 gdate) + 2389 ", date=" + gdate; 2390 2391 // See if we can use gdate to avoid date calculation. 2392 if (fixedDate != cachedFixedDate) { 2393 gcal.getCalendarDateFromFixedDate(gdate, fixedDate); 2394 cachedFixedDate = fixedDate; 2395 } 2396 2397 year = gdate.getYear(); 2398 if (year <= 0) { 2399 year = 1 - year; 2400 era = BCE; 2401 } 2402 calsys = gcal; 2403 cdate = gdate; 2404 assert cdate.getDayOfWeek() > 0 : "dow="+cdate.getDayOfWeek()+", date="+cdate; 2405 } else { 2406 // Handle Julian calendar dates. 2407 calsys = getJulianCalendarSystem(); 2408 cdate = (BaseCalendar.Date) jcal.newCalendarDate(getZone()); 2409 jcal.getCalendarDateFromFixedDate(cdate, fixedDate); 2410 Era e = cdate.getEra(); 2411 if (e == jeras[0]) { 2412 era = BCE; 2413 } 2414 year = cdate.getYear(); 2415 } 2416 2417 // Always set the ERA and YEAR values. 2418 internalSet(ERA, era); 2419 internalSet(YEAR, year); 2420 int mask = fieldMask | (ERA_MASK|YEAR_MASK); 2421 2422 int month = cdate.getMonth() - 1; // 0-based 2423 int dayOfMonth = cdate.getDayOfMonth(); 2424 2425 // Set the basic date fields. 2426 if ((fieldMask & (MONTH_MASK|DAY_OF_MONTH_MASK|DAY_OF_WEEK_MASK)) 2427 != 0) { 2428 internalSet(MONTH, month); 2429 internalSet(DAY_OF_MONTH, dayOfMonth); 2430 internalSet(DAY_OF_WEEK, cdate.getDayOfWeek()); 2431 mask |= MONTH_MASK|DAY_OF_MONTH_MASK|DAY_OF_WEEK_MASK; 2432 } 2433 2434 if ((fieldMask & (HOUR_OF_DAY_MASK|AM_PM_MASK|HOUR_MASK 2435 |MINUTE_MASK|SECOND_MASK|MILLISECOND_MASK)) != 0) { 2436 if (timeOfDay != 0) { 2437 int hours = timeOfDay / ONE_HOUR; 2438 internalSet(HOUR_OF_DAY, hours); 2439 internalSet(AM_PM, hours / 12); // Assume AM == 0 2440 internalSet(HOUR, hours % 12); 2441 int r = timeOfDay % ONE_HOUR; 2442 internalSet(MINUTE, r / ONE_MINUTE); 2443 r %= ONE_MINUTE; 2444 internalSet(SECOND, r / ONE_SECOND); 2445 internalSet(MILLISECOND, r % ONE_SECOND); 2446 } else { 2447 internalSet(HOUR_OF_DAY, 0); 2448 internalSet(AM_PM, AM); 2449 internalSet(HOUR, 0); 2450 internalSet(MINUTE, 0); 2451 internalSet(SECOND, 0); 2452 internalSet(MILLISECOND, 0); 2453 } 2454 mask |= (HOUR_OF_DAY_MASK|AM_PM_MASK|HOUR_MASK 2455 |MINUTE_MASK|SECOND_MASK|MILLISECOND_MASK); 2456 } 2457 2458 if ((fieldMask & (ZONE_OFFSET_MASK|DST_OFFSET_MASK)) != 0) { 2459 internalSet(ZONE_OFFSET, zoneOffsets[0]); 2460 internalSet(DST_OFFSET, zoneOffsets[1]); 2461 mask |= (ZONE_OFFSET_MASK|DST_OFFSET_MASK); 2462 } 2463 2464 if ((fieldMask & (DAY_OF_YEAR_MASK|WEEK_OF_YEAR_MASK|WEEK_OF_MONTH_MASK|DAY_OF_WEEK_IN_MONTH_MASK)) != 0) { 2465 int normalizedYear = cdate.getNormalizedYear(); 2466 long fixedDateJan1 = calsys.getFixedDate(normalizedYear, 1, 1, cdate); 2467 int dayOfYear = (int)(fixedDate - fixedDateJan1) + 1; 2468 long fixedDateMonth1 = fixedDate - dayOfMonth + 1; 2469 int cutoverGap = 0; 2470 int cutoverYear = (calsys == gcal) ? gregorianCutoverYear : gregorianCutoverYearJulian; 2471 int relativeDayOfMonth = dayOfMonth - 1; 2472 2473 // If we are in the cutover year, we need some special handling. 2474 if (normalizedYear == cutoverYear) { 2475 // Need to take care of the "missing" days. 2476 if (gregorianCutoverYearJulian <= gregorianCutoverYear) { 2477 // We need to find out where we are. The cutover 2478 // gap could even be more than one year. (One 2479 // year difference in ~48667 years.) 2480 fixedDateJan1 = getFixedDateJan1(cdate, fixedDate); 2481 if (fixedDate >= gregorianCutoverDate) { 2482 fixedDateMonth1 = getFixedDateMonth1(cdate, fixedDate); 2483 } 2484 } 2485 int realDayOfYear = (int)(fixedDate - fixedDateJan1) + 1; 2486 cutoverGap = dayOfYear - realDayOfYear; 2487 dayOfYear = realDayOfYear; 2488 relativeDayOfMonth = (int)(fixedDate - fixedDateMonth1); 2489 } 2490 internalSet(DAY_OF_YEAR, dayOfYear); 2491 internalSet(DAY_OF_WEEK_IN_MONTH, relativeDayOfMonth / 7 + 1); 2492 2493 int weekOfYear = getWeekNumber(fixedDateJan1, fixedDate); 2494 2495 // The spec is to calculate WEEK_OF_YEAR in the 2496 // ISO8601-style. This creates problems, though. 2497 if (weekOfYear == 0) { 2498 // If the date belongs to the last week of the 2499 // previous year, use the week number of "12/31" of 2500 // the "previous" year. Again, if the previous year is 2501 // the Gregorian cutover year, we need to take care of 2502 // it. Usually the previous day of January 1 is 2503 // December 31, which is not always true in 2504 // GregorianCalendar. 2505 long fixedDec31 = fixedDateJan1 - 1; 2506 long prevJan1 = fixedDateJan1 - 365; 2507 if (normalizedYear > (cutoverYear + 1)) { 2508 if (CalendarUtils.isGregorianLeapYear(normalizedYear - 1)) { 2509 --prevJan1; 2510 } 2511 } else if (normalizedYear <= gregorianCutoverYearJulian) { 2512 if (CalendarUtils.isJulianLeapYear(normalizedYear - 1)) { 2513 --prevJan1; 2514 } 2515 } else { 2516 BaseCalendar calForJan1 = calsys; 2517 //int prevYear = normalizedYear - 1; 2518 int prevYear = getCalendarDate(fixedDec31).getNormalizedYear(); 2519 if (prevYear == gregorianCutoverYear) { 2520 calForJan1 = getCutoverCalendarSystem(); 2521 if (calForJan1 == jcal) { 2522 prevJan1 = calForJan1.getFixedDate(prevYear, 2523 BaseCalendar.JANUARY, 2524 1, 2525 null); 2526 } else { 2527 prevJan1 = gregorianCutoverDate; 2528 calForJan1 = gcal; 2529 } 2530 } else if (prevYear <= gregorianCutoverYearJulian) { 2531 calForJan1 = getJulianCalendarSystem(); 2532 prevJan1 = calForJan1.getFixedDate(prevYear, 2533 BaseCalendar.JANUARY, 2534 1, 2535 null); 2536 } 2537 } 2538 weekOfYear = getWeekNumber(prevJan1, fixedDec31); 2539 } else { 2540 if (normalizedYear > gregorianCutoverYear || 2541 normalizedYear < (gregorianCutoverYearJulian - 1)) { 2542 // Regular years 2543 if (weekOfYear >= 52) { 2544 long nextJan1 = fixedDateJan1 + 365; 2545 if (cdate.isLeapYear()) { 2546 nextJan1++; 2547 } 2548 long nextJan1st = BaseCalendar.getDayOfWeekDateOnOrBefore(nextJan1 + 6, 2549 getFirstDayOfWeek()); 2550 int ndays = (int)(nextJan1st - nextJan1); 2551 if (ndays >= getMinimalDaysInFirstWeek() && fixedDate >= (nextJan1st - 7)) { 2552 // The first days forms a week in which the date is included. 2553 weekOfYear = 1; 2554 } 2555 } 2556 } else { 2557 BaseCalendar calForJan1 = calsys; 2558 int nextYear = normalizedYear + 1; 2559 if (nextYear == (gregorianCutoverYearJulian + 1) && 2560 nextYear < gregorianCutoverYear) { 2561 // In case the gap is more than one year. 2562 nextYear = gregorianCutoverYear; 2563 } 2564 if (nextYear == gregorianCutoverYear) { 2565 calForJan1 = getCutoverCalendarSystem(); 2566 } 2567 2568 long nextJan1; 2569 if (nextYear > gregorianCutoverYear 2570 || gregorianCutoverYearJulian == gregorianCutoverYear 2571 || nextYear == gregorianCutoverYearJulian) { 2572 nextJan1 = calForJan1.getFixedDate(nextYear, 2573 BaseCalendar.JANUARY, 2574 1, 2575 null); 2576 } else { 2577 nextJan1 = gregorianCutoverDate; 2578 calForJan1 = gcal; 2579 } 2580 2581 long nextJan1st = BaseCalendar.getDayOfWeekDateOnOrBefore(nextJan1 + 6, 2582 getFirstDayOfWeek()); 2583 int ndays = (int)(nextJan1st - nextJan1); 2584 if (ndays >= getMinimalDaysInFirstWeek() && fixedDate >= (nextJan1st - 7)) { 2585 // The first days forms a week in which the date is included. 2586 weekOfYear = 1; 2587 } 2588 } 2589 } 2590 internalSet(WEEK_OF_YEAR, weekOfYear); 2591 internalSet(WEEK_OF_MONTH, getWeekNumber(fixedDateMonth1, fixedDate)); 2592 mask |= (DAY_OF_YEAR_MASK|WEEK_OF_YEAR_MASK|WEEK_OF_MONTH_MASK|DAY_OF_WEEK_IN_MONTH_MASK); 2593 } 2594 return mask; 2595 } 2596 2597 /** 2598 * Returns the number of weeks in a period between fixedDay1 and 2599 * fixedDate. The getFirstDayOfWeek-getMinimalDaysInFirstWeek rule 2600 * is applied to calculate the number of weeks. 2601 * 2602 * @param fixedDay1 the fixed date of the first day of the period 2603 * @param fixedDate the fixed date of the last day of the period 2604 * @return the number of weeks of the given period 2605 */ 2606 private int getWeekNumber(long fixedDay1, long fixedDate) { 2607 // We can always use `gcal' since Julian and Gregorian are the 2608 // same thing for this calculation. 2609 long fixedDay1st = Gregorian.getDayOfWeekDateOnOrBefore(fixedDay1 + 6, 2610 getFirstDayOfWeek()); 2611 int ndays = (int)(fixedDay1st - fixedDay1); 2612 assert ndays <= 7; 2613 if (ndays >= getMinimalDaysInFirstWeek()) { 2614 fixedDay1st -= 7; 2615 } 2616 int normalizedDayOfPeriod = (int)(fixedDate - fixedDay1st); 2617 if (normalizedDayOfPeriod >= 0) { 2618 return normalizedDayOfPeriod / 7 + 1; 2619 } 2620 return CalendarUtils.floorDivide(normalizedDayOfPeriod, 7) + 1; 2621 } 2622 2623 /** 2624 * Converts calendar field values to the time value (millisecond 2625 * offset from the <a href="Calendar.html#Epoch">Epoch</a>). 2626 * 2627 * @exception IllegalArgumentException if any calendar fields are invalid. 2628 */ 2629 @Override 2630 protected void computeTime() { 2631 // In non-lenient mode, perform brief checking of calendar 2632 // fields which have been set externally. Through this 2633 // checking, the field values are stored in originalFields[] 2634 // to see if any of them are normalized later. 2635 if (!isLenient()) { 2636 if (originalFields == null) { 2637 originalFields = new int[FIELD_COUNT]; 2638 } 2639 for (int field = 0; field < FIELD_COUNT; field++) { 2640 int value = internalGet(field); 2641 if (isExternallySet(field)) { 2642 // Quick validation for any out of range values 2643 if (value < getMinimum(field) || value > getMaximum(field)) { 2644 throw new IllegalArgumentException(getFieldName(field)); 2645 } 2646 } 2647 originalFields[field] = value; 2648 } 2649 } 2650 2651 // Let the super class determine which calendar fields to be 2652 // used to calculate the time. 2653 int fieldMask = selectFields(); 2654 2655 // The year defaults to the epoch start. We don't check 2656 // fieldMask for YEAR because YEAR is a mandatory field to 2657 // determine the date. 2658 int year = isSet(YEAR) ? internalGet(YEAR) : EPOCH_YEAR; 2659 2660 int era = internalGetEra(); 2661 if (era == BCE) { 2662 year = 1 - year; 2663 } else if (era != CE) { 2664 // Even in lenient mode we disallow ERA values other than CE & BCE. 2665 // (The same normalization rule as add()/roll() could be 2666 // applied here in lenient mode. But this checking is kept 2667 // unchanged for compatibility as of 1.5.) 2668 throw new IllegalArgumentException("Invalid era"); 2669 } 2670 2671 // If year is 0 or negative, we need to set the ERA value later. 2672 if (year <= 0 && !isSet(ERA)) { 2673 fieldMask |= ERA_MASK; 2674 setFieldsComputed(ERA_MASK); 2675 } 2676 2677 // Calculate the time of day. We rely on the convention that 2678 // an UNSET field has 0. 2679 long timeOfDay = 0; 2680 if (isFieldSet(fieldMask, HOUR_OF_DAY)) { 2681 timeOfDay += (long) internalGet(HOUR_OF_DAY); 2682 } else { 2683 timeOfDay += internalGet(HOUR); 2684 // The default value of AM_PM is 0 which designates AM. 2685 if (isFieldSet(fieldMask, AM_PM)) { 2686 timeOfDay += 12 * internalGet(AM_PM); 2687 } 2688 } 2689 timeOfDay *= 60; 2690 timeOfDay += internalGet(MINUTE); 2691 timeOfDay *= 60; 2692 timeOfDay += internalGet(SECOND); 2693 timeOfDay *= 1000; 2694 timeOfDay += internalGet(MILLISECOND); 2695 2696 // Convert the time of day to the number of days and the 2697 // millisecond offset from midnight. 2698 long fixedDate = timeOfDay / ONE_DAY; 2699 timeOfDay %= ONE_DAY; 2700 while (timeOfDay < 0) { 2701 timeOfDay += ONE_DAY; 2702 --fixedDate; 2703 } 2704 2705 // Calculate the fixed date since January 1, 1 (Gregorian). 2706 calculateFixedDate: { 2707 long gfd, jfd; 2708 if (year > gregorianCutoverYear && year > gregorianCutoverYearJulian) { 2709 gfd = fixedDate + getFixedDate(gcal, year, fieldMask); 2710 if (gfd >= gregorianCutoverDate) { 2711 fixedDate = gfd; 2712 break calculateFixedDate; 2713 } 2714 jfd = fixedDate + getFixedDate(getJulianCalendarSystem(), year, fieldMask); 2715 } else if (year < gregorianCutoverYear && year < gregorianCutoverYearJulian) { 2716 jfd = fixedDate + getFixedDate(getJulianCalendarSystem(), year, fieldMask); 2717 if (jfd < gregorianCutoverDate) { 2718 fixedDate = jfd; 2719 break calculateFixedDate; 2720 } 2721 gfd = jfd; 2722 } else { 2723 jfd = fixedDate + getFixedDate(getJulianCalendarSystem(), year, fieldMask); 2724 gfd = fixedDate + getFixedDate(gcal, year, fieldMask); 2725 } 2726 2727 // Now we have to determine which calendar date it is. 2728 2729 // If the date is relative from the beginning of the year 2730 // in the Julian calendar, then use jfd; 2731 if (isFieldSet(fieldMask, DAY_OF_YEAR) || isFieldSet(fieldMask, WEEK_OF_YEAR)) { 2732 if (gregorianCutoverYear == gregorianCutoverYearJulian) { 2733 fixedDate = jfd; 2734 break calculateFixedDate; 2735 } else if (year == gregorianCutoverYear) { 2736 fixedDate = gfd; 2737 break calculateFixedDate; 2738 } 2739 } 2740 2741 if (gfd >= gregorianCutoverDate) { 2742 if (jfd >= gregorianCutoverDate) { 2743 fixedDate = gfd; 2744 } else { 2745 // The date is in an "overlapping" period. No way 2746 // to disambiguate it. Determine it using the 2747 // previous date calculation. 2748 if (calsys == gcal || calsys == null) { 2749 fixedDate = gfd; 2750 } else { 2751 fixedDate = jfd; 2752 } 2753 } 2754 } else { 2755 if (jfd < gregorianCutoverDate) { 2756 fixedDate = jfd; 2757 } else { 2758 // The date is in a "missing" period. 2759 if (!isLenient()) { 2760 throw new IllegalArgumentException("the specified date doesn't exist"); 2761 } 2762 // Take the Julian date for compatibility, which 2763 // will produce a Gregorian date. 2764 fixedDate = jfd; 2765 } 2766 } 2767 } 2768 2769 // millis represents local wall-clock time in milliseconds. 2770 long millis = (fixedDate - EPOCH_OFFSET) * ONE_DAY + timeOfDay; 2771 2772 // Compute the time zone offset and DST offset. There are two potential 2773 // ambiguities here. We'll assume a 2:00 am (wall time) switchover time 2774 // for discussion purposes here. 2775 // 1. The transition into DST. Here, a designated time of 2:00 am - 2:59 am 2776 // can be in standard or in DST depending. However, 2:00 am is an invalid 2777 // representation (the representation jumps from 1:59:59 am Std to 3:00:00 am DST). 2778 // We assume standard time. 2779 // 2. The transition out of DST. Here, a designated time of 1:00 am - 1:59 am 2780 // can be in standard or DST. Both are valid representations (the rep 2781 // jumps from 1:59:59 DST to 1:00:00 Std). 2782 // Again, we assume standard time. 2783 // We use the TimeZone object, unless the user has explicitly set the ZONE_OFFSET 2784 // or DST_OFFSET fields; then we use those fields. 2785 TimeZone zone = getZone(); 2786 if (zoneOffsets == null) { 2787 zoneOffsets = new int[2]; 2788 } 2789 int tzMask = fieldMask & (ZONE_OFFSET_MASK|DST_OFFSET_MASK); 2790 if (tzMask != (ZONE_OFFSET_MASK|DST_OFFSET_MASK)) { 2791 if (zone instanceof ZoneInfo) { 2792 ((ZoneInfo)zone).getOffsetsByWall(millis, zoneOffsets); 2793 } else { 2794 int gmtOffset = isFieldSet(fieldMask, ZONE_OFFSET) ? 2795 internalGet(ZONE_OFFSET) : zone.getRawOffset(); 2796 zone.getOffsets(millis - gmtOffset, zoneOffsets); 2797 } 2798 } 2799 if (tzMask != 0) { 2800 if (isFieldSet(tzMask, ZONE_OFFSET)) { 2801 zoneOffsets[0] = internalGet(ZONE_OFFSET); 2802 } 2803 if (isFieldSet(tzMask, DST_OFFSET)) { 2804 zoneOffsets[1] = internalGet(DST_OFFSET); 2805 } 2806 } 2807 2808 // Adjust the time zone offset values to get the UTC time. 2809 millis -= zoneOffsets[0] + zoneOffsets[1]; 2810 2811 // Set this calendar's time in milliseconds 2812 time = millis; 2813 2814 int mask = computeFields(fieldMask | getSetStateFields(), tzMask); 2815 2816 if (!isLenient()) { 2817 for (int field = 0; field < FIELD_COUNT; field++) { 2818 if (!isExternallySet(field)) { 2819 continue; 2820 } 2821 if (originalFields[field] != internalGet(field)) { 2822 String s = originalFields[field] + " -> " + internalGet(field); 2823 // Restore the original field values 2824 System.arraycopy(originalFields, 0, fields, 0, fields.length); 2825 throw new IllegalArgumentException(getFieldName(field) + ": " + s); 2826 } 2827 } 2828 } 2829 setFieldsNormalized(mask); 2830 } 2831 2832 /** 2833 * Computes the fixed date under either the Gregorian or the 2834 * Julian calendar, using the given year and the specified calendar fields. 2835 * 2836 * @param cal the CalendarSystem to be used for the date calculation 2837 * @param year the normalized year number, with 0 indicating the 2838 * year 1 BCE, -1 indicating 2 BCE, etc. 2839 * @param fieldMask the calendar fields to be used for the date calculation 2840 * @return the fixed date 2841 * @see Calendar#selectFields 2842 */ 2843 private long getFixedDate(BaseCalendar cal, int year, int fieldMask) { 2844 int month = JANUARY; 2845 if (isFieldSet(fieldMask, MONTH)) { 2846 // No need to check if MONTH has been set (no isSet(MONTH) 2847 // call) since its unset value happens to be JANUARY (0). 2848 month = internalGet(MONTH); 2849 2850 // If the month is out of range, adjust it into range 2851 if (month > DECEMBER) { 2852 year += month / 12; 2853 month %= 12; 2854 } else if (month < JANUARY) { 2855 int[] rem = new int[1]; 2856 year += CalendarUtils.floorDivide(month, 12, rem); 2857 month = rem[0]; 2858 } 2859 } 2860 2861 // Get the fixed date since Jan 1, 1 (Gregorian). We are on 2862 // the first day of either `month' or January in 'year'. 2863 long fixedDate = cal.getFixedDate(year, month + 1, 1, 2864 cal == gcal ? gdate : null); 2865 if (isFieldSet(fieldMask, MONTH)) { 2866 // Month-based calculations 2867 if (isFieldSet(fieldMask, DAY_OF_MONTH)) { 2868 // We are on the first day of the month. Just add the 2869 // offset if DAY_OF_MONTH is set. If the isSet call 2870 // returns false, that means DAY_OF_MONTH has been 2871 // selected just because of the selected 2872 // combination. We don't need to add any since the 2873 // default value is the 1st. 2874 if (isSet(DAY_OF_MONTH)) { 2875 // To avoid underflow with DAY_OF_MONTH-1, add 2876 // DAY_OF_MONTH, then subtract 1. 2877 fixedDate += internalGet(DAY_OF_MONTH); 2878 fixedDate--; 2879 } 2880 } else { 2881 if (isFieldSet(fieldMask, WEEK_OF_MONTH)) { 2882 long firstDayOfWeek = BaseCalendar.getDayOfWeekDateOnOrBefore(fixedDate + 6, 2883 getFirstDayOfWeek()); 2884 // If we have enough days in the first week, then 2885 // move to the previous week. 2886 if ((firstDayOfWeek - fixedDate) >= getMinimalDaysInFirstWeek()) { 2887 firstDayOfWeek -= 7; 2888 } 2889 if (isFieldSet(fieldMask, DAY_OF_WEEK)) { 2890 firstDayOfWeek = BaseCalendar.getDayOfWeekDateOnOrBefore(firstDayOfWeek + 6, 2891 internalGet(DAY_OF_WEEK)); 2892 } 2893 // In lenient mode, we treat days of the previous 2894 // months as a part of the specified 2895 // WEEK_OF_MONTH. See 4633646. 2896 fixedDate = firstDayOfWeek + 7 * (internalGet(WEEK_OF_MONTH) - 1); 2897 } else { 2898 int dayOfWeek; 2899 if (isFieldSet(fieldMask, DAY_OF_WEEK)) { 2900 dayOfWeek = internalGet(DAY_OF_WEEK); 2901 } else { 2902 dayOfWeek = getFirstDayOfWeek(); 2903 } 2904 // We are basing this on the day-of-week-in-month. The only 2905 // trickiness occurs if the day-of-week-in-month is 2906 // negative. 2907 int dowim; 2908 if (isFieldSet(fieldMask, DAY_OF_WEEK_IN_MONTH)) { 2909 dowim = internalGet(DAY_OF_WEEK_IN_MONTH); 2910 } else { 2911 dowim = 1; 2912 } 2913 if (dowim >= 0) { 2914 fixedDate = BaseCalendar.getDayOfWeekDateOnOrBefore(fixedDate + (7 * dowim) - 1, 2915 dayOfWeek); 2916 } else { 2917 // Go to the first day of the next week of 2918 // the specified week boundary. 2919 int lastDate = monthLength(month, year) + (7 * (dowim + 1)); 2920 // Then, get the day of week date on or before the last date. 2921 fixedDate = BaseCalendar.getDayOfWeekDateOnOrBefore(fixedDate + lastDate - 1, 2922 dayOfWeek); 2923 } 2924 } 2925 } 2926 } else { 2927 if (year == gregorianCutoverYear && cal == gcal 2928 && fixedDate < gregorianCutoverDate 2929 && gregorianCutoverYear != gregorianCutoverYearJulian) { 2930 // January 1 of the year doesn't exist. Use 2931 // gregorianCutoverDate as the first day of the 2932 // year. 2933 fixedDate = gregorianCutoverDate; 2934 } 2935 // We are on the first day of the year. 2936 if (isFieldSet(fieldMask, DAY_OF_YEAR)) { 2937 // Add the offset, then subtract 1. (Make sure to avoid underflow.) 2938 fixedDate += internalGet(DAY_OF_YEAR); 2939 fixedDate--; 2940 } else { 2941 long firstDayOfWeek = BaseCalendar.getDayOfWeekDateOnOrBefore(fixedDate + 6, 2942 getFirstDayOfWeek()); 2943 // If we have enough days in the first week, then move 2944 // to the previous week. 2945 if ((firstDayOfWeek - fixedDate) >= getMinimalDaysInFirstWeek()) { 2946 firstDayOfWeek -= 7; 2947 } 2948 if (isFieldSet(fieldMask, DAY_OF_WEEK)) { 2949 int dayOfWeek = internalGet(DAY_OF_WEEK); 2950 if (dayOfWeek != getFirstDayOfWeek()) { 2951 firstDayOfWeek = BaseCalendar.getDayOfWeekDateOnOrBefore(firstDayOfWeek + 6, 2952 dayOfWeek); 2953 } 2954 } 2955 fixedDate = firstDayOfWeek + 7 * ((long)internalGet(WEEK_OF_YEAR) - 1); 2956 } 2957 } 2958 2959 return fixedDate; 2960 } 2961 2962 /** 2963 * Returns this object if it's normalized (all fields and time are 2964 * in sync). Otherwise, a cloned object is returned after calling 2965 * complete() in lenient mode. 2966 */ 2967 private GregorianCalendar getNormalizedCalendar() { 2968 GregorianCalendar gc; 2969 if (isFullyNormalized()) { 2970 gc = this; 2971 } else { 2972 // Create a clone and normalize the calendar fields 2973 gc = (GregorianCalendar) this.clone(); 2974 gc.setLenient(true); 2975 gc.complete(); 2976 } 2977 return gc; 2978 } 2979 2980 /** 2981 * Returns the Julian calendar system instance (singleton). 'jcal' 2982 * and 'jeras' are set upon the return. 2983 */ 2984 private static synchronized BaseCalendar getJulianCalendarSystem() { 2985 if (jcal == null) { 2986 jcal = (JulianCalendar) CalendarSystem.forName("julian"); 2987 jeras = jcal.getEras(); 2988 } 2989 return jcal; 2990 } 2991 2992 /** 2993 * Returns the calendar system for dates before the cutover date 2994 * in the cutover year. If the cutover date is January 1, the 2995 * method returns Gregorian. Otherwise, Julian. 2996 */ 2997 private BaseCalendar getCutoverCalendarSystem() { 2998 if (gregorianCutoverYearJulian < gregorianCutoverYear) { 2999 return gcal; 3000 } 3001 return getJulianCalendarSystem(); 3002 } 3003 3004 /** 3005 * Determines if the specified year (normalized) is the Gregorian 3006 * cutover year. This object must have been normalized. 3007 */ 3008 private boolean isCutoverYear(int normalizedYear) { 3009 int cutoverYear = (calsys == gcal) ? gregorianCutoverYear : gregorianCutoverYearJulian; 3010 return normalizedYear == cutoverYear; 3011 } 3012 3013 /** 3014 * Returns the fixed date of the first day of the year (usually 3015 * January 1) before the specified date. 3016 * 3017 * @param date the date for which the first day of the year is 3018 * calculated. The date has to be in the cut-over year (Gregorian 3019 * or Julian). 3020 * @param fixedDate the fixed date representation of the date 3021 */ 3022 private long getFixedDateJan1(BaseCalendar.Date date, long fixedDate) { 3023 assert date.getNormalizedYear() == gregorianCutoverYear || 3024 date.getNormalizedYear() == gregorianCutoverYearJulian; 3025 if (gregorianCutoverYear != gregorianCutoverYearJulian) { 3026 if (fixedDate >= gregorianCutoverDate) { 3027 // Dates before the cutover date don't exist 3028 // in the same (Gregorian) year. So, no 3029 // January 1 exists in the year. Use the 3030 // cutover date as the first day of the year. 3031 return gregorianCutoverDate; 3032 } 3033 } 3034 // January 1 of the normalized year should exist. 3035 BaseCalendar juliancal = getJulianCalendarSystem(); 3036 return juliancal.getFixedDate(date.getNormalizedYear(), BaseCalendar.JANUARY, 1, null); 3037 } 3038 3039 /** 3040 * Returns the fixed date of the first date of the month (usually 3041 * the 1st of the month) before the specified date. 3042 * 3043 * @param date the date for which the first day of the month is 3044 * calculated. The date has to be in the cut-over year (Gregorian 3045 * or Julian). 3046 * @param fixedDate the fixed date representation of the date 3047 */ 3048 private long getFixedDateMonth1(BaseCalendar.Date date, long fixedDate) { 3049 assert date.getNormalizedYear() == gregorianCutoverYear || 3050 date.getNormalizedYear() == gregorianCutoverYearJulian; 3051 BaseCalendar.Date gCutover = getGregorianCutoverDate(); 3052 if (gCutover.getMonth() == BaseCalendar.JANUARY 3053 && gCutover.getDayOfMonth() == 1) { 3054 // The cutover happened on January 1. 3055 return fixedDate - date.getDayOfMonth() + 1; 3056 } 3057 3058 long fixedDateMonth1; 3059 // The cutover happened sometime during the year. 3060 if (date.getMonth() == gCutover.getMonth()) { 3061 // The cutover happened in the month. 3062 BaseCalendar.Date jLastDate = getLastJulianDate(); 3063 if (gregorianCutoverYear == gregorianCutoverYearJulian 3064 && gCutover.getMonth() == jLastDate.getMonth()) { 3065 // The "gap" fits in the same month. 3066 fixedDateMonth1 = jcal.getFixedDate(date.getNormalizedYear(), 3067 date.getMonth(), 3068 1, 3069 null); 3070 } else { 3071 // Use the cutover date as the first day of the month. 3072 fixedDateMonth1 = gregorianCutoverDate; 3073 } 3074 } else { 3075 // The cutover happened before the month. 3076 fixedDateMonth1 = fixedDate - date.getDayOfMonth() + 1; 3077 } 3078 3079 return fixedDateMonth1; 3080 } 3081 3082 /** 3083 * Returns a CalendarDate produced from the specified fixed date. 3084 * 3085 * @param fd the fixed date 3086 */ 3087 private BaseCalendar.Date getCalendarDate(long fd) { 3088 BaseCalendar cal = (fd >= gregorianCutoverDate) ? gcal : getJulianCalendarSystem(); 3089 BaseCalendar.Date d = (BaseCalendar.Date) cal.newCalendarDate(TimeZone.NO_TIMEZONE); 3090 cal.getCalendarDateFromFixedDate(d, fd); 3091 return d; 3092 } 3093 3094 /** 3095 * Returns the Gregorian cutover date as a BaseCalendar.Date. The 3096 * date is a Gregorian date. 3097 */ 3098 private BaseCalendar.Date getGregorianCutoverDate() { 3099 return getCalendarDate(gregorianCutoverDate); 3100 } 3101 3102 /** 3103 * Returns the day before the Gregorian cutover date as a 3104 * BaseCalendar.Date. The date is a Julian date. 3105 */ 3106 private BaseCalendar.Date getLastJulianDate() { 3107 return getCalendarDate(gregorianCutoverDate - 1); 3108 } 3109 3110 /** 3111 * Returns the length of the specified month in the specified 3112 * year. The year number must be normalized. 3113 * 3114 * @see #isLeapYear(int) 3115 */ 3116 private int monthLength(int month, int year) { 3117 return isLeapYear(year) ? LEAP_MONTH_LENGTH[month] : MONTH_LENGTH[month]; 3118 } 3119 3120 /** 3121 * Returns the length of the specified month in the year provided 3122 * by internalGet(YEAR). 3123 * 3124 * @see #isLeapYear(int) 3125 */ 3126 private int monthLength(int month) { 3127 int year = internalGet(YEAR); 3128 if (internalGetEra() == BCE) { 3129 year = 1 - year; 3130 } 3131 return monthLength(month, year); 3132 } 3133 3134 private int actualMonthLength() { 3135 int year = cdate.getNormalizedYear(); 3136 if (year != gregorianCutoverYear && year != gregorianCutoverYearJulian) { 3137 return calsys.getMonthLength(cdate); 3138 } 3139 BaseCalendar.Date date = (BaseCalendar.Date) cdate.clone(); 3140 long fd = calsys.getFixedDate(date); 3141 long month1 = getFixedDateMonth1(date, fd); 3142 long next1 = month1 + calsys.getMonthLength(date); 3143 if (next1 < gregorianCutoverDate) { 3144 return (int)(next1 - month1); 3145 } 3146 if (cdate != gdate) { 3147 date = (BaseCalendar.Date) gcal.newCalendarDate(TimeZone.NO_TIMEZONE); 3148 } 3149 gcal.getCalendarDateFromFixedDate(date, next1); 3150 next1 = getFixedDateMonth1(date, next1); 3151 return (int)(next1 - month1); 3152 } 3153 3154 /** 3155 * Returns the length (in days) of the specified year. The year 3156 * must be normalized. 3157 */ 3158 private int yearLength(int year) { 3159 return isLeapYear(year) ? 366 : 365; 3160 } 3161 3162 /** 3163 * Returns the length (in days) of the year provided by 3164 * internalGet(YEAR). 3165 */ 3166 private int yearLength() { 3167 int year = internalGet(YEAR); 3168 if (internalGetEra() == BCE) { 3169 year = 1 - year; 3170 } 3171 return yearLength(year); 3172 } 3173 3174 /** 3175 * After adjustments such as add(MONTH), add(YEAR), we don't want the 3176 * month to jump around. E.g., we don't want Jan 31 + 1 month to go to Mar 3177 * 3, we want it to go to Feb 28. Adjustments which might run into this 3178 * problem call this method to retain the proper month. 3179 */ 3180 private void pinDayOfMonth() { 3181 int year = internalGet(YEAR); 3182 int monthLen; 3183 if (year > gregorianCutoverYear || year < gregorianCutoverYearJulian) { 3184 monthLen = monthLength(internalGet(MONTH)); 3185 } else { 3186 GregorianCalendar gc = getNormalizedCalendar(); 3187 monthLen = gc.getActualMaximum(DAY_OF_MONTH); 3188 } 3189 int dom = internalGet(DAY_OF_MONTH); 3190 if (dom > monthLen) { 3191 set(DAY_OF_MONTH, monthLen); 3192 } 3193 } 3194 3195 /** 3196 * Returns the fixed date value of this object. The time value and 3197 * calendar fields must be in synch. 3198 */ 3199 private long getCurrentFixedDate() { 3200 return (calsys == gcal) ? cachedFixedDate : calsys.getFixedDate(cdate); 3201 } 3202 3203 /** 3204 * Returns the new value after 'roll'ing the specified value and amount. 3205 */ 3206 private static int getRolledValue(int value, int amount, int min, int max) { 3207 assert value >= min && value <= max; 3208 int range = max - min + 1; 3209 amount %= range; 3210 int n = value + amount; 3211 if (n > max) { 3212 n -= range; 3213 } else if (n < min) { 3214 n += range; 3215 } 3216 assert n >= min && n <= max; 3217 return n; 3218 } 3219 3220 /** 3221 * Returns the ERA. We need a special method for this because the 3222 * default ERA is CE, but a zero (unset) ERA is BCE. 3223 */ 3224 private int internalGetEra() { 3225 return isSet(ERA) ? internalGet(ERA) : CE; 3226 } 3227 3228 /** 3229 * Updates internal state. 3230 */ 3231 private void readObject(ObjectInputStream stream) 3232 throws IOException, ClassNotFoundException { 3233 stream.defaultReadObject(); 3234 if (gdate == null) { 3235 gdate = (BaseCalendar.Date) gcal.newCalendarDate(getZone()); 3236 cachedFixedDate = Long.MIN_VALUE; 3237 } 3238 setGregorianChange(gregorianCutover); 3239 } 3240 3241 /** 3242 * Converts this object to a {@code ZonedDateTime} that represents 3243 * the same point on the time-line as this {@code GregorianCalendar}. 3244 * <p> 3245 * Since this object supports a Julian-Gregorian cutover date and 3246 * {@code ZonedDateTime} does not, it is possible that the resulting year, 3247 * month and day will have different values. The result will represent the 3248 * correct date in the ISO calendar system, which will also be the same value 3249 * for Modified Julian Days. 3250 * 3251 * @return a zoned date-time representing the same point on the time-line 3252 * as this gregorian calendar 3253 * @since 1.8 3254 */ 3255 public ZonedDateTime toZonedDateTime() { 3256 return ZonedDateTime.ofInstant(Instant.ofEpochMilli(getTimeInMillis()), 3257 getTimeZone().toZoneId()); 3258 } 3259 3260 /** 3261 * Obtains an instance of {@code GregorianCalendar} with the default locale 3262 * from a {@code ZonedDateTime} object. 3263 * <p> 3264 * Since {@code ZonedDateTime} does not support a Julian-Gregorian cutover 3265 * date and uses ISO calendar system, the return GregorianCalendar is a pure 3266 * Gregorian calendar and uses ISO 8601 standard for week definitions, 3267 * which has {@code MONDAY} as the {@link Calendar#getFirstDayOfWeek() 3268 * FirstDayOfWeek} and {@code 4} as the value of the 3269 * {@link Calendar#getMinimalDaysInFirstWeek() MinimalDaysInFirstWeek}. 3270 * <p> 3271 * {@code ZoneDateTime} can store points on the time-line further in the 3272 * future and further in the past than {@code GregorianCalendar}. In this 3273 * scenario, this method will throw an {@code IllegalArgumentException} 3274 * exception. 3275 * 3276 * @param zdt the zoned date-time object to convert 3277 * @return the gregorian calendar representing the same point on the 3278 * time-line as the zoned date-time provided 3279 * @exception NullPointerException if {@code zdt} is null 3280 * @exception IllegalArgumentException if the zoned date-time is too 3281 * large to represent as a {@code GregorianCalendar} 3282 * @since 1.8 3283 */ 3284 public static GregorianCalendar from(ZonedDateTime zdt) { 3285 GregorianCalendar cal = new GregorianCalendar(TimeZone.getTimeZone(zdt.getZone())); 3286 cal.setGregorianChange(new Date(Long.MIN_VALUE)); 3287 cal.setFirstDayOfWeek(MONDAY); 3288 cal.setMinimalDaysInFirstWeek(4); 3289 try { 3290 cal.setTimeInMillis(Math.addExact(Math.multiplyExact(zdt.toEpochSecond(), 1000), 3291 zdt.get(ChronoField.MILLI_OF_SECOND))); 3292 } catch (ArithmeticException ex) { 3293 throw new IllegalArgumentException(ex); 3294 } 3295 return cal; 3296 } 3297 }