1 /* 2 * Copyright (c) 2012, 2013, 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 * Copyright (c) 2012, Stephen Colebourne & Michael Nascimento Santos 28 * 29 * All rights reserved. 30 * 31 * Redistribution and use in source and binary forms, with or without 32 * modification, are permitted provided that the following conditions are met: 33 * 34 * * Redistributions of source code must retain the above copyright notice, 35 * this list of conditions and the following disclaimer. 36 * 37 * * Redistributions in binary form must reproduce the above copyright notice, 38 * this list of conditions and the following disclaimer in the documentation 39 * and/or other materials provided with the distribution. 40 * 41 * * Neither the name of JSR-310 nor the names of its contributors 42 * may be used to endorse or promote products derived from this software 43 * without specific prior written permission. 44 * 45 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 46 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 47 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 48 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR 49 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 50 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 51 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 52 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 53 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 54 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 55 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 56 */ 57 package java.time.chrono; 58 59 import static java.time.temporal.ChronoField.ALIGNED_DAY_OF_WEEK_IN_MONTH; 60 import static java.time.temporal.ChronoField.ALIGNED_DAY_OF_WEEK_IN_YEAR; 61 import static java.time.temporal.ChronoField.ALIGNED_WEEK_OF_MONTH; 62 import static java.time.temporal.ChronoField.ALIGNED_WEEK_OF_YEAR; 63 import static java.time.temporal.ChronoField.DAY_OF_MONTH; 64 import static java.time.temporal.ChronoField.MONTH_OF_YEAR; 65 import static java.time.temporal.ChronoField.YEAR; 66 67 import java.io.IOException; 68 import java.io.InvalidObjectException; 69 import java.io.ObjectInput; 70 import java.io.ObjectInputStream; 71 import java.io.ObjectOutput; 72 import java.io.Serializable; 73 import java.time.Clock; 74 import java.time.DateTimeException; 75 import java.time.LocalDate; 76 import java.time.LocalTime; 77 import java.time.ZoneId; 78 import java.time.temporal.ChronoField; 79 import java.time.temporal.TemporalAccessor; 80 import java.time.temporal.TemporalAdjuster; 81 import java.time.temporal.TemporalAmount; 82 import java.time.temporal.TemporalField; 83 import java.time.temporal.TemporalQuery; 84 import java.time.temporal.TemporalUnit; 85 import java.time.temporal.UnsupportedTemporalTypeException; 86 import java.time.temporal.ValueRange; 87 88 // Android-changed: removed ValueBased paragraph. 89 /** 90 * A date in the Hijrah calendar system. 91 * <p> 92 * This date operates using one of several variants of the 93 * {@linkplain HijrahChronology Hijrah calendar}. 94 * <p> 95 * The Hijrah calendar has a different total of days in a year than 96 * Gregorian calendar, and the length of each month is based on the period 97 * of a complete revolution of the moon around the earth 98 * (as between successive new moons). 99 * Refer to the {@link HijrahChronology} for details of supported variants. 100 * <p> 101 * Each HijrahDate is created bound to a particular HijrahChronology, 102 * The same chronology is propagated to each HijrahDate computed from the date. 103 * To use a different Hijrah variant, its HijrahChronology can be used 104 * to create new HijrahDate instances. 105 * Alternatively, the {@link #withVariant} method can be used to convert 106 * to a new HijrahChronology. 107 * 108 * @implSpec 109 * This class is immutable and thread-safe. 110 * 111 * @since 1.8 112 */ 113 public final class HijrahDate 114 extends ChronoLocalDateImpl<HijrahDate> 115 implements ChronoLocalDate, Serializable { 116 117 /** 118 * Serialization version. 119 */ 120 private static final long serialVersionUID = -5207853542612002020L; 121 /** 122 * The Chronology of this HijrahDate. 123 */ 124 private final transient HijrahChronology chrono; 125 /** 126 * The proleptic year. 127 */ 128 private final transient int prolepticYear; 129 /** 130 * The month-of-year. 131 */ 132 private final transient int monthOfYear; 133 /** 134 * The day-of-month. 135 */ 136 private final transient int dayOfMonth; 137 138 //------------------------------------------------------------------------- 139 /** 140 * Obtains an instance of {@code HijrahDate} from the Hijrah proleptic year, 141 * month-of-year and day-of-month. 142 * 143 * @param prolepticYear the proleptic year to represent in the Hijrah calendar 144 * @param monthOfYear the month-of-year to represent, from 1 to 12 145 * @param dayOfMonth the day-of-month to represent, from 1 to 30 146 * @return the Hijrah date, never null 147 * @throws DateTimeException if the value of any field is out of range 148 */ 149 static HijrahDate of(HijrahChronology chrono, int prolepticYear, int monthOfYear, int dayOfMonth) { 150 return new HijrahDate(chrono, prolepticYear, monthOfYear, dayOfMonth); 151 } 152 153 /** 154 * Returns a HijrahDate for the chronology and epochDay. 155 * @param chrono The Hijrah chronology 156 * @param epochDay the epoch day 157 * @return a HijrahDate for the epoch day; non-null 158 */ 159 static HijrahDate ofEpochDay(HijrahChronology chrono, long epochDay) { 160 return new HijrahDate(chrono, epochDay); 161 } 162 163 //----------------------------------------------------------------------- 164 /** 165 * Obtains the current {@code HijrahDate} of the Islamic Umm Al-Qura calendar 166 * in the default time-zone. 167 * <p> 168 * This will query the {@link Clock#systemDefaultZone() system clock} in the default 169 * time-zone to obtain the current date. 170 * <p> 171 * Using this method will prevent the ability to use an alternate clock for testing 172 * because the clock is hard-coded. 173 * 174 * @return the current date using the system clock and default time-zone, not null 175 */ 176 public static HijrahDate now() { 177 return now(Clock.systemDefaultZone()); 178 } 179 180 /** 181 * Obtains the current {@code HijrahDate} of the Islamic Umm Al-Qura calendar 182 * in the specified time-zone. 183 * <p> 184 * This will query the {@link Clock#system(ZoneId) system clock} to obtain the current date. 185 * Specifying the time-zone avoids dependence on the default time-zone. 186 * <p> 187 * Using this method will prevent the ability to use an alternate clock for testing 188 * because the clock is hard-coded. 189 * 190 * @param zone the zone ID to use, not null 191 * @return the current date using the system clock, not null 192 */ 193 public static HijrahDate now(ZoneId zone) { 194 return now(Clock.system(zone)); 195 } 196 197 /** 198 * Obtains the current {@code HijrahDate} of the Islamic Umm Al-Qura calendar 199 * from the specified clock. 200 * <p> 201 * This will query the specified clock to obtain the current date - today. 202 * Using this method allows the use of an alternate clock for testing. 203 * The alternate clock may be introduced using {@linkplain Clock dependency injection}. 204 * 205 * @param clock the clock to use, not null 206 * @return the current date, not null 207 * @throws DateTimeException if the current date cannot be obtained 208 */ 209 public static HijrahDate now(Clock clock) { 210 return HijrahDate.ofEpochDay(HijrahChronology.INSTANCE, LocalDate.now(clock).toEpochDay()); 211 } 212 213 /** 214 * Obtains a {@code HijrahDate} of the Islamic Umm Al-Qura calendar 215 * from the proleptic-year, month-of-year and day-of-month fields. 216 * <p> 217 * This returns a {@code HijrahDate} with the specified fields. 218 * The day must be valid for the year and month, otherwise an exception will be thrown. 219 * 220 * @param prolepticYear the Hijrah proleptic-year 221 * @param month the Hijrah month-of-year, from 1 to 12 222 * @param dayOfMonth the Hijrah day-of-month, from 1 to 30 223 * @return the date in Hijrah calendar system, not null 224 * @throws DateTimeException if the value of any field is out of range, 225 * or if the day-of-month is invalid for the month-year 226 */ 227 public static HijrahDate of(int prolepticYear, int month, int dayOfMonth) { 228 return HijrahChronology.INSTANCE.date(prolepticYear, month, dayOfMonth); 229 } 230 231 /** 232 * Obtains a {@code HijrahDate} of the Islamic Umm Al-Qura calendar from a temporal object. 233 * <p> 234 * This obtains a date in the Hijrah calendar system based on the specified temporal. 235 * A {@code TemporalAccessor} represents an arbitrary set of date and time information, 236 * which this factory converts to an instance of {@code HijrahDate}. 237 * <p> 238 * The conversion typically uses the {@link ChronoField#EPOCH_DAY EPOCH_DAY} 239 * field, which is standardized across calendar systems. 240 * <p> 241 * This method matches the signature of the functional interface {@link TemporalQuery} 242 * allowing it to be used as a query via method reference, {@code HijrahDate::from}. 243 * 244 * @param temporal the temporal object to convert, not null 245 * @return the date in Hijrah calendar system, not null 246 * @throws DateTimeException if unable to convert to a {@code HijrahDate} 247 */ 248 public static HijrahDate from(TemporalAccessor temporal) { 249 return HijrahChronology.INSTANCE.date(temporal); 250 } 251 252 //----------------------------------------------------------------------- 253 /** 254 * Constructs an {@code HijrahDate} with the proleptic-year, month-of-year and 255 * day-of-month fields. 256 * 257 * @param chrono The chronology to create the date with 258 * @param prolepticYear the proleptic year 259 * @param monthOfYear the month of year 260 * @param dayOfMonth the day of month 261 */ 262 private HijrahDate(HijrahChronology chrono, int prolepticYear, int monthOfYear, int dayOfMonth) { 263 // Computing the Gregorian day checks the valid ranges 264 chrono.getEpochDay(prolepticYear, monthOfYear, dayOfMonth); 265 266 this.chrono = chrono; 267 this.prolepticYear = prolepticYear; 268 this.monthOfYear = monthOfYear; 269 this.dayOfMonth = dayOfMonth; 270 } 271 272 /** 273 * Constructs an instance with the Epoch Day. 274 * 275 * @param epochDay the epochDay 276 */ 277 private HijrahDate(HijrahChronology chrono, long epochDay) { 278 int[] dateInfo = chrono.getHijrahDateInfo((int)epochDay); 279 280 this.chrono = chrono; 281 this.prolepticYear = dateInfo[0]; 282 this.monthOfYear = dateInfo[1]; 283 this.dayOfMonth = dateInfo[2]; 284 } 285 286 //----------------------------------------------------------------------- 287 /** 288 * Gets the chronology of this date, which is the Hijrah calendar system. 289 * <p> 290 * The {@code Chronology} represents the calendar system in use. 291 * The era and other fields in {@link ChronoField} are defined by the chronology. 292 * 293 * @return the Hijrah chronology, not null 294 */ 295 @Override 296 public HijrahChronology getChronology() { 297 return chrono; 298 } 299 300 /** 301 * Gets the era applicable at this date. 302 * <p> 303 * The Hijrah calendar system has one era, 'AH', 304 * defined by {@link HijrahEra}. 305 * 306 * @return the era applicable at this date, not null 307 */ 308 @Override 309 public HijrahEra getEra() { 310 return HijrahEra.AH; 311 } 312 313 /** 314 * Returns the length of the month represented by this date. 315 * <p> 316 * This returns the length of the month in days. 317 * Month lengths in the Hijrah calendar system vary between 29 and 30 days. 318 * 319 * @return the length of the month in days 320 */ 321 @Override 322 public int lengthOfMonth() { 323 return chrono.getMonthLength(prolepticYear, monthOfYear); 324 } 325 326 /** 327 * Returns the length of the year represented by this date. 328 * <p> 329 * This returns the length of the year in days. 330 * A Hijrah calendar system year is typically shorter than 331 * that of the ISO calendar system. 332 * 333 * @return the length of the year in days 334 */ 335 @Override 336 public int lengthOfYear() { 337 return chrono.getYearLength(prolepticYear); 338 } 339 340 //----------------------------------------------------------------------- 341 @Override 342 public ValueRange range(TemporalField field) { 343 if (field instanceof ChronoField) { 344 if (isSupported(field)) { 345 ChronoField f = (ChronoField) field; 346 switch (f) { 347 case DAY_OF_MONTH: return ValueRange.of(1, lengthOfMonth()); 348 case DAY_OF_YEAR: return ValueRange.of(1, lengthOfYear()); 349 case ALIGNED_WEEK_OF_MONTH: return ValueRange.of(1, 5); // TODO 350 // TODO does the limited range of valid years cause years to 351 // start/end part way through? that would affect range 352 } 353 return getChronology().range(f); 354 } 355 throw new UnsupportedTemporalTypeException("Unsupported field: " + field); 356 } 357 return field.rangeRefinedBy(this); 358 } 359 360 @Override 361 public long getLong(TemporalField field) { 362 if (field instanceof ChronoField) { 363 switch ((ChronoField) field) { 364 case DAY_OF_WEEK: return getDayOfWeek(); 365 case ALIGNED_DAY_OF_WEEK_IN_MONTH: return ((getDayOfWeek() - 1) % 7) + 1; 366 case ALIGNED_DAY_OF_WEEK_IN_YEAR: return ((getDayOfYear() - 1) % 7) + 1; 367 case DAY_OF_MONTH: return this.dayOfMonth; 368 case DAY_OF_YEAR: return this.getDayOfYear(); 369 case EPOCH_DAY: return toEpochDay(); 370 case ALIGNED_WEEK_OF_MONTH: return ((dayOfMonth - 1) / 7) + 1; 371 case ALIGNED_WEEK_OF_YEAR: return ((getDayOfYear() - 1) / 7) + 1; 372 case MONTH_OF_YEAR: return monthOfYear; 373 case PROLEPTIC_MONTH: return getProlepticMonth(); 374 case YEAR_OF_ERA: return prolepticYear; 375 case YEAR: return prolepticYear; 376 case ERA: return getEraValue(); 377 } 378 throw new UnsupportedTemporalTypeException("Unsupported field: " + field); 379 } 380 return field.getFrom(this); 381 } 382 383 private long getProlepticMonth() { 384 return prolepticYear * 12L + monthOfYear - 1; 385 } 386 387 @Override 388 public HijrahDate with(TemporalField field, long newValue) { 389 if (field instanceof ChronoField) { 390 ChronoField f = (ChronoField) field; 391 // not using checkValidIntValue so EPOCH_DAY and PROLEPTIC_MONTH work 392 chrono.range(f).checkValidValue(newValue, f); // TODO: validate value 393 int nvalue = (int) newValue; 394 switch (f) { 395 case DAY_OF_WEEK: return plusDays(newValue - getDayOfWeek()); 396 case ALIGNED_DAY_OF_WEEK_IN_MONTH: return plusDays(newValue - getLong(ALIGNED_DAY_OF_WEEK_IN_MONTH)); 397 case ALIGNED_DAY_OF_WEEK_IN_YEAR: return plusDays(newValue - getLong(ALIGNED_DAY_OF_WEEK_IN_YEAR)); 398 case DAY_OF_MONTH: return resolvePreviousValid(prolepticYear, monthOfYear, nvalue); 399 case DAY_OF_YEAR: return plusDays(Math.min(nvalue, lengthOfYear()) - getDayOfYear()); 400 case EPOCH_DAY: return new HijrahDate(chrono, newValue); 401 case ALIGNED_WEEK_OF_MONTH: return plusDays((newValue - getLong(ALIGNED_WEEK_OF_MONTH)) * 7); 402 case ALIGNED_WEEK_OF_YEAR: return plusDays((newValue - getLong(ALIGNED_WEEK_OF_YEAR)) * 7); 403 case MONTH_OF_YEAR: return resolvePreviousValid(prolepticYear, nvalue, dayOfMonth); 404 case PROLEPTIC_MONTH: return plusMonths(newValue - getProlepticMonth()); 405 case YEAR_OF_ERA: return resolvePreviousValid(prolepticYear >= 1 ? nvalue : 1 - nvalue, monthOfYear, dayOfMonth); 406 case YEAR: return resolvePreviousValid(nvalue, monthOfYear, dayOfMonth); 407 case ERA: return resolvePreviousValid(1 - prolepticYear, monthOfYear, dayOfMonth); 408 } 409 throw new UnsupportedTemporalTypeException("Unsupported field: " + field); 410 } 411 return super.with(field, newValue); 412 } 413 414 private HijrahDate resolvePreviousValid(int prolepticYear, int month, int day) { 415 int monthDays = chrono.getMonthLength(prolepticYear, month); 416 if (day > monthDays) { 417 day = monthDays; 418 } 419 return HijrahDate.of(chrono, prolepticYear, month, day); 420 } 421 422 /** 423 * {@inheritDoc} 424 * @throws DateTimeException if unable to make the adjustment. 425 * For example, if the adjuster requires an ISO chronology 426 * @throws ArithmeticException {@inheritDoc} 427 */ 428 @Override 429 public HijrahDate with(TemporalAdjuster adjuster) { 430 return super.with(adjuster); 431 } 432 433 /** 434 * Returns a {@code HijrahDate} with the Chronology requested. 435 * <p> 436 * The year, month, and day are checked against the new requested 437 * HijrahChronology. If the chronology has a shorter month length 438 * for the month, the day is reduced to be the last day of the month. 439 * 440 * @param chronology the new HijrahChonology, non-null 441 * @return a HijrahDate with the requested HijrahChronology, non-null 442 */ 443 public HijrahDate withVariant(HijrahChronology chronology) { 444 if (chrono == chronology) { 445 return this; 446 } 447 // Like resolvePreviousValid the day is constrained to stay in the same month 448 int monthDays = chronology.getDayOfYear(prolepticYear, monthOfYear); 449 return HijrahDate.of(chronology, prolepticYear, monthOfYear,(dayOfMonth > monthDays) ? monthDays : dayOfMonth ); 450 } 451 452 /** 453 * {@inheritDoc} 454 * @throws DateTimeException {@inheritDoc} 455 * @throws ArithmeticException {@inheritDoc} 456 */ 457 @Override 458 public HijrahDate plus(TemporalAmount amount) { 459 return super.plus(amount); 460 } 461 462 /** 463 * {@inheritDoc} 464 * @throws DateTimeException {@inheritDoc} 465 * @throws ArithmeticException {@inheritDoc} 466 */ 467 @Override 468 public HijrahDate minus(TemporalAmount amount) { 469 return super.minus(amount); 470 } 471 472 @Override 473 public long toEpochDay() { 474 return chrono.getEpochDay(prolepticYear, monthOfYear, dayOfMonth); 475 } 476 477 /** 478 * Gets the day-of-year field. 479 * <p> 480 * This method returns the primitive {@code int} value for the day-of-year. 481 * 482 * @return the day-of-year 483 */ 484 private int getDayOfYear() { 485 return chrono.getDayOfYear(prolepticYear, monthOfYear) + dayOfMonth; 486 } 487 488 /** 489 * Gets the day-of-week value. 490 * 491 * @return the day-of-week; computed from the epochday 492 */ 493 private int getDayOfWeek() { 494 int dow0 = (int)Math.floorMod(toEpochDay() + 3, 7); 495 return dow0 + 1; 496 } 497 498 /** 499 * Gets the Era of this date. 500 * 501 * @return the Era of this date; computed from epochDay 502 */ 503 private int getEraValue() { 504 return (prolepticYear > 1 ? 1 : 0); 505 } 506 507 //----------------------------------------------------------------------- 508 /** 509 * Checks if the year is a leap year, according to the Hijrah calendar system rules. 510 * 511 * @return true if this date is in a leap year 512 */ 513 @Override 514 public boolean isLeapYear() { 515 return chrono.isLeapYear(prolepticYear); 516 } 517 518 //----------------------------------------------------------------------- 519 @Override 520 HijrahDate plusYears(long years) { 521 if (years == 0) { 522 return this; 523 } 524 int newYear = Math.addExact(this.prolepticYear, (int)years); 525 return resolvePreviousValid(newYear, monthOfYear, dayOfMonth); 526 } 527 528 @Override 529 HijrahDate plusMonths(long monthsToAdd) { 530 if (monthsToAdd == 0) { 531 return this; 532 } 533 long monthCount = prolepticYear * 12L + (monthOfYear - 1); 534 long calcMonths = monthCount + monthsToAdd; // safe overflow 535 int newYear = chrono.checkValidYear(Math.floorDiv(calcMonths, 12L)); 536 int newMonth = (int)Math.floorMod(calcMonths, 12L) + 1; 537 return resolvePreviousValid(newYear, newMonth, dayOfMonth); 538 } 539 540 @Override 541 HijrahDate plusWeeks(long weeksToAdd) { 542 return super.plusWeeks(weeksToAdd); 543 } 544 545 @Override 546 HijrahDate plusDays(long days) { 547 return new HijrahDate(chrono, toEpochDay() + days); 548 } 549 550 @Override 551 public HijrahDate plus(long amountToAdd, TemporalUnit unit) { 552 return super.plus(amountToAdd, unit); 553 } 554 555 @Override 556 public HijrahDate minus(long amountToSubtract, TemporalUnit unit) { 557 return super.minus(amountToSubtract, unit); 558 } 559 560 @Override 561 HijrahDate minusYears(long yearsToSubtract) { 562 return super.minusYears(yearsToSubtract); 563 } 564 565 @Override 566 HijrahDate minusMonths(long monthsToSubtract) { 567 return super.minusMonths(monthsToSubtract); 568 } 569 570 @Override 571 HijrahDate minusWeeks(long weeksToSubtract) { 572 return super.minusWeeks(weeksToSubtract); 573 } 574 575 @Override 576 HijrahDate minusDays(long daysToSubtract) { 577 return super.minusDays(daysToSubtract); 578 } 579 580 @Override // for javadoc and covariant return type 581 @SuppressWarnings("unchecked") 582 public final ChronoLocalDateTime<HijrahDate> atTime(LocalTime localTime) { 583 return (ChronoLocalDateTime<HijrahDate>)super.atTime(localTime); 584 } 585 586 @Override 587 public ChronoPeriod until(ChronoLocalDate endDate) { 588 // TODO: untested 589 HijrahDate end = getChronology().date(endDate); 590 long totalMonths = (end.prolepticYear - this.prolepticYear) * 12 + (end.monthOfYear - this.monthOfYear); // safe 591 int days = end.dayOfMonth - this.dayOfMonth; 592 if (totalMonths > 0 && days < 0) { 593 totalMonths--; 594 HijrahDate calcDate = this.plusMonths(totalMonths); 595 days = (int) (end.toEpochDay() - calcDate.toEpochDay()); // safe 596 } else if (totalMonths < 0 && days > 0) { 597 totalMonths++; 598 days -= end.lengthOfMonth(); 599 } 600 long years = totalMonths / 12; // safe 601 int months = (int) (totalMonths % 12); // safe 602 return getChronology().period(Math.toIntExact(years), months, days); 603 } 604 605 //------------------------------------------------------------------------- 606 /** 607 * Compares this date to another date, including the chronology. 608 * <p> 609 * Compares this {@code HijrahDate} with another ensuring that the date is the same. 610 * <p> 611 * Only objects of type {@code HijrahDate} are compared, other types return false. 612 * To compare the dates of two {@code TemporalAccessor} instances, including dates 613 * in two different chronologies, use {@link ChronoField#EPOCH_DAY} as a comparator. 614 * 615 * @param obj the object to check, null returns false 616 * @return true if this is equal to the other date and the Chronologies are equal 617 */ 618 @Override // override for performance 619 public boolean equals(Object obj) { 620 if (this == obj) { 621 return true; 622 } 623 if (obj instanceof HijrahDate) { 624 HijrahDate otherDate = (HijrahDate) obj; 625 return prolepticYear == otherDate.prolepticYear 626 && this.monthOfYear == otherDate.monthOfYear 627 && this.dayOfMonth == otherDate.dayOfMonth 628 && getChronology().equals(otherDate.getChronology()); 629 } 630 return false; 631 } 632 633 /** 634 * A hash code for this date. 635 * 636 * @return a suitable hash code based only on the Chronology and the date 637 */ 638 @Override // override for performance 639 public int hashCode() { 640 int yearValue = prolepticYear; 641 int monthValue = monthOfYear; 642 int dayValue = dayOfMonth; 643 return getChronology().getId().hashCode() ^ (yearValue & 0xFFFFF800) 644 ^ ((yearValue << 11) + (monthValue << 6) + (dayValue)); 645 } 646 647 //----------------------------------------------------------------------- 648 /** 649 * Defend against malicious streams. 650 * 651 * @param s the stream to read 652 * @throws InvalidObjectException always 653 */ 654 private void readObject(ObjectInputStream s) throws InvalidObjectException { 655 throw new InvalidObjectException("Deserialization via serialization delegate"); 656 } 657 658 /** 659 * Writes the object using a 660 * <a href="../../../serialized-form.html#java.time.chrono.Ser">dedicated serialized form</a>. 661 * @serialData 662 * <pre> 663 * out.writeByte(6); // identifies a HijrahDate 664 * out.writeObject(chrono); // the HijrahChronology variant 665 * out.writeInt(get(YEAR)); 666 * out.writeByte(get(MONTH_OF_YEAR)); 667 * out.writeByte(get(DAY_OF_MONTH)); 668 * </pre> 669 * 670 * @return the instance of {@code Ser}, not null 671 */ 672 private Object writeReplace() { 673 return new Ser(Ser.HIJRAH_DATE_TYPE, this); 674 } 675 676 void writeExternal(ObjectOutput out) throws IOException { 677 // HijrahChronology is implicit in the Hijrah_DATE_TYPE 678 out.writeObject(getChronology()); 679 out.writeInt(get(YEAR)); 680 out.writeByte(get(MONTH_OF_YEAR)); 681 out.writeByte(get(DAY_OF_MONTH)); 682 } 683 684 static HijrahDate readExternal(ObjectInput in) throws IOException, ClassNotFoundException { 685 HijrahChronology chrono = (HijrahChronology) in.readObject(); 686 int year = in.readInt(); 687 int month = in.readByte(); 688 int dayOfMonth = in.readByte(); 689 return chrono.date(year, month, dayOfMonth); 690 } 691 692 } 693
