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 * This file is available under and governed by the GNU General Public
28 * License version 2 only, as published by the Free Software Foundation.
29 * However, the following notice accompanied the original version of this
30 * file:
31 *
32 * Copyright (c) 2012, Stephen Colebourne & Michael Nascimento Santos
33 *
34 * All rights reserved.
35 *
36 * Redistribution and use in source and binary forms, with or without
37 * modification, are permitted provided that the following conditions are met:
38 *
39 * * Redistributions of source code must retain the above copyright notice,
40 * this list of conditions and the following disclaimer.
41 *
42 * * Redistributions in binary form must reproduce the above copyright notice,
43 * this list of conditions and the following disclaimer in the documentation
44 * and/or other materials provided with the distribution.
45 *
46 * * Neither the name of JSR-310 nor the names of its contributors
47 * may be used to endorse or promote products derived from this software
48 * without specific prior written permission.
49 *
50 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
51 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
52 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
53 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
54 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
55 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
56 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
57 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
58 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
59 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
60 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
61 */
62 package java.time.chrono;
63
64 import static java.time.temporal.ChronoField.ALIGNED_DAY_OF_WEEK_IN_MONTH;
65 import static java.time.temporal.ChronoField.ALIGNED_DAY_OF_WEEK_IN_YEAR;
66 import static java.time.temporal.ChronoField.ALIGNED_WEEK_OF_MONTH;
67 import static java.time.temporal.ChronoField.ALIGNED_WEEK_OF_YEAR;
68 import static java.time.temporal.ChronoField.DAY_OF_MONTH;
69 import static java.time.temporal.ChronoField.DAY_OF_WEEK;
70 import static java.time.temporal.ChronoField.DAY_OF_YEAR;
71 import static java.time.temporal.ChronoField.EPOCH_DAY;
72 import static java.time.temporal.ChronoField.ERA;
73 import static java.time.temporal.ChronoField.MONTH_OF_YEAR;
74 import static java.time.temporal.ChronoField.PROLEPTIC_MONTH;
75 import static java.time.temporal.ChronoField.YEAR;
76 import static java.time.temporal.ChronoField.YEAR_OF_ERA;
77 import static java.time.temporal.TemporalAdjuster.nextOrSame;
78
79 import java.io.Serializable;
80 import java.time.Clock;
81 import java.time.DateTimeException;
82 import java.time.DayOfWeek;
83 import java.time.Instant;
84 import java.time.LocalDate;
85 import java.time.LocalDateTime;
86 import java.time.Month;
87 import java.time.Year;
88 import java.time.ZoneId;
89 import java.time.ZonedDateTime;
90 import java.time.format.ResolverStyle;
91 import java.time.temporal.ChronoField;
92 import java.time.temporal.TemporalAccessor;
93 import java.time.temporal.TemporalField;
94 import java.time.temporal.ValueRange;
95 import java.util.Arrays;
96 import java.util.List;
97 import java.util.Locale;
98 import java.util.Map;
99 import java.util.Objects;
100
101 /**
102 * The ISO calendar system.
103 * <p>
104 * This chronology defines the rules of the ISO calendar system.
105 * This calendar system is based on the ISO-8601 standard, which is the
106 * <i>de facto</i> world calendar.
107 * <p>
108 * The fields are defined as follows:
109 * <p><ul>
110 * <li>era - There are two eras, 'Current Era' (CE) and 'Before Current Era' (BCE).
111 * <li>year-of-era - The year-of-era is the same as the proleptic-year for the current CE era.
112 * For the BCE era before the ISO epoch the year increases from 1 upwards as time goes backwards.
113 * <li>proleptic-year - The proleptic year is the same as the year-of-era for the
114 * current era. For the previous era, years have zero, then negative values.
115 * <li>month-of-year - There are 12 months in an ISO year, numbered from 1 to 12.
116 * <li>day-of-month - There are between 28 and 31 days in each of the ISO month, numbered from 1 to 31.
117 * Months 4, 6, 9 and 11 have 30 days, Months 1, 3, 5, 7, 8, 10 and 12 have 31 days.
118 * Month 2 has 28 days, or 29 in a leap year.
119 * <li>day-of-year - There are 365 days in a standard ISO year and 366 in a leap year.
120 * The days are numbered from 1 to 365 or 1 to 366.
121 * <li>leap-year - Leap years occur every 4 years, except where the year is divisble by 100 and not divisble by 400.
122 * </ul><p>
123 *
124 * <h3>Specification for implementors</h3>
125 * This class is immutable and thread-safe.
126 *
127 * @since 1.8
128 */
129 public final class IsoChronology extends Chronology implements Serializable {
130
131 /**
132 * Singleton instance of the ISO chronology.
133 */
134 public static final IsoChronology INSTANCE = new IsoChronology();
135
136 /**
137 * Serialization version.
138 */
139 private static final long serialVersionUID = -1440403870442975015L;
140
141 /**
142 * Restricted constructor.
143 */
144 private IsoChronology() {
145 }
146
147 //-----------------------------------------------------------------------
148 /**
149 * Gets the ID of the chronology - 'ISO'.
150 * <p>
151 * The ID uniquely identifies the {@code Chronology}.
152 * It can be used to lookup the {@code Chronology} using {@link #of(String)}.
153 *
154 * @return the chronology ID - 'ISO'
155 * @see #getCalendarType()
156 */
157 @Override
158 public String getId() {
159 return "ISO";
160 }
161
162 /**
163 * Gets the calendar type of the underlying calendar system - 'iso8601'.
164 * <p>
165 * The calendar type is an identifier defined by the
166 * <em>Unicode Locale Data Markup Language (LDML)</em> specification.
167 * It can be used to lookup the {@code Chronology} using {@link #of(String)}.
168 * It can also be used as part of a locale, accessible via
169 * {@link Locale#getUnicodeLocaleType(String)} with the key 'ca'.
170 *
171 * @return the calendar system type - 'iso8601'
172 * @see #getId()
173 */
174 @Override
175 public String getCalendarType() {
176 return "iso8601";
177 }
178
179 //-----------------------------------------------------------------------
180 /**
181 * Obtains an ISO local date from the era, year-of-era, month-of-year
182 * and day-of-month fields.
183 *
184 * @param era the ISO era, not null
185 * @param yearOfEra the ISO year-of-era
186 * @param month the ISO month-of-year
187 * @param dayOfMonth the ISO day-of-month
188 * @return the ISO local date, not null
189 * @throws DateTimeException if unable to create the date
190 * @throws ClassCastException if the type of {@code era} is not {@code IsoEra}
191 */
192 @Override // override with covariant return type
193 public LocalDate date(Era era, int yearOfEra, int month, int dayOfMonth) {
194 return date(prolepticYear(era, yearOfEra), month, dayOfMonth);
195 }
196
197 /**
198 * Obtains an ISO local date from the proleptic-year, month-of-year
199 * and day-of-month fields.
200 * <p>
201 * This is equivalent to {@link LocalDate#of(int, int, int)}.
202 *
203 * @param prolepticYear the ISO proleptic-year
204 * @param month the ISO month-of-year
205 * @param dayOfMonth the ISO day-of-month
206 * @return the ISO local date, not null
207 * @throws DateTimeException if unable to create the date
208 */
209 @Override // override with covariant return type
210 public LocalDate date(int prolepticYear, int month, int dayOfMonth) {
211 return LocalDate.of(prolepticYear, month, dayOfMonth);
212 }
213
214 /**
215 * Obtains an ISO local date from the era, year-of-era and day-of-year fields.
216 *
217 * @param era the ISO era, not null
218 * @param yearOfEra the ISO year-of-era
219 * @param dayOfYear the ISO day-of-year
220 * @return the ISO local date, not null
221 * @throws DateTimeException if unable to create the date
222 */
223 @Override // override with covariant return type
224 public LocalDate dateYearDay(Era era, int yearOfEra, int dayOfYear) {
225 return dateYearDay(prolepticYear(era, yearOfEra), dayOfYear);
226 }
227
228 /**
229 * Obtains an ISO local date from the proleptic-year and day-of-year fields.
230 * <p>
231 * This is equivalent to {@link LocalDate#ofYearDay(int, int)}.
232 *
233 * @param prolepticYear the ISO proleptic-year
234 * @param dayOfYear the ISO day-of-year
235 * @return the ISO local date, not null
236 * @throws DateTimeException if unable to create the date
237 */
238 @Override // override with covariant return type
239 public LocalDate dateYearDay(int prolepticYear, int dayOfYear) {
240 return LocalDate.ofYearDay(prolepticYear, dayOfYear);
241 }
242
243 /**
244 * Obtains an ISO local date from the epoch-day.
245 * <p>
246 * This is equivalent to {@link LocalDate#ofEpochDay(long)}.
247 *
248 * @param epochDay the epoch day
249 * @return the ISO local date, not null
250 * @throws DateTimeException if unable to create the date
251 */
252 @Override // override with covariant return type
253 public LocalDate dateEpochDay(long epochDay) {
254 return LocalDate.ofEpochDay(epochDay);
255 }
256
257 //-----------------------------------------------------------------------
258 /**
259 * Obtains an ISO local date from another date-time object.
260 * <p>
261 * This is equivalent to {@link LocalDate#from(TemporalAccessor)}.
262 *
263 * @param temporal the date-time object to convert, not null
264 * @return the ISO local date, not null
265 * @throws DateTimeException if unable to create the date
266 */
267 @Override // override with covariant return type
268 public LocalDate date(TemporalAccessor temporal) {
269 return LocalDate.from(temporal);
270 }
271
272 /**
273 * Obtains an ISO local date-time from another date-time object.
274 * <p>
275 * This is equivalent to {@link LocalDateTime#from(TemporalAccessor)}.
276 *
277 * @param temporal the date-time object to convert, not null
278 * @return the ISO local date-time, not null
279 * @throws DateTimeException if unable to create the date-time
280 */
281 @Override // override with covariant return type
282 public LocalDateTime localDateTime(TemporalAccessor temporal) {
283 return LocalDateTime.from(temporal);
284 }
285
286 /**
287 * Obtains an ISO zoned date-time from another date-time object.
288 * <p>
289 * This is equivalent to {@link ZonedDateTime#from(TemporalAccessor)}.
290 *
291 * @param temporal the date-time object to convert, not null
292 * @return the ISO zoned date-time, not null
293 * @throws DateTimeException if unable to create the date-time
294 */
295 @Override // override with covariant return type
296 public ZonedDateTime zonedDateTime(TemporalAccessor temporal) {
297 return ZonedDateTime.from(temporal);
298 }
299
300 /**
301 * Obtains an ISO zoned date-time in this chronology from an {@code Instant}.
302 * <p>
303 * This is equivalent to {@link ZonedDateTime#ofInstant(Instant, ZoneId)}.
304 *
305 * @param instant the instant to create the date-time from, not null
306 * @param zone the time-zone, not null
307 * @return the zoned date-time, not null
308 * @throws DateTimeException if the result exceeds the supported range
309 */
310 @Override
311 public ZonedDateTime zonedDateTime(Instant instant, ZoneId zone) {
312 return ZonedDateTime.ofInstant(instant, zone);
313 }
314
315 //-----------------------------------------------------------------------
316 /**
317 * Obtains the current ISO local date from the system clock in the default time-zone.
318 * <p>
319 * This will query the {@link Clock#systemDefaultZone() system clock} in the default
320 * time-zone to obtain the current date.
321 * <p>
322 * Using this method will prevent the ability to use an alternate clock for testing
323 * because the clock is hard-coded.
324 *
325 * @return the current ISO local date using the system clock and default time-zone, not null
326 * @throws DateTimeException if unable to create the date
327 */
328 @Override // override with covariant return type
329 public LocalDate dateNow() {
330 return dateNow(Clock.systemDefaultZone());
331 }
332
333 /**
334 * Obtains the current ISO local date from the system clock in the specified time-zone.
335 * <p>
336 * This will query the {@link Clock#system(ZoneId) system clock} to obtain the current date.
337 * Specifying the time-zone avoids dependence on the default time-zone.
338 * <p>
339 * Using this method will prevent the ability to use an alternate clock for testing
340 * because the clock is hard-coded.
341 *
342 * @return the current ISO local date using the system clock, not null
343 * @throws DateTimeException if unable to create the date
344 */
345 @Override // override with covariant return type
346 public LocalDate dateNow(ZoneId zone) {
347 return dateNow(Clock.system(zone));
348 }
349
350 /**
351 * Obtains the current ISO local date from the specified clock.
352 * <p>
353 * This will query the specified clock to obtain the current date - today.
354 * Using this method allows the use of an alternate clock for testing.
355 * The alternate clock may be introduced using {@link Clock dependency injection}.
356 *
357 * @param clock the clock to use, not null
358 * @return the current ISO local date, not null
359 * @throws DateTimeException if unable to create the date
360 */
361 @Override // override with covariant return type
362 public LocalDate dateNow(Clock clock) {
363 Objects.requireNonNull(clock, "clock");
364 return date(LocalDate.now(clock));
365 }
366
367 //-----------------------------------------------------------------------
368 /**
369 * Checks if the year is a leap year, according to the ISO proleptic
370 * calendar system rules.
371 * <p>
372 * This method applies the current rules for leap years across the whole time-line.
373 * In general, a year is a leap year if it is divisible by four without
374 * remainder. However, years divisible by 100, are not leap years, with
375 * the exception of years divisible by 400 which are.
376 * <p>
377 * For example, 1904 is a leap year it is divisible by 4.
378 * 1900 was not a leap year as it is divisible by 100, however 2000 was a
379 * leap year as it is divisible by 400.
380 * <p>
381 * The calculation is proleptic - applying the same rules into the far future and far past.
382 * This is historically inaccurate, but is correct for the ISO-8601 standard.
383 *
384 * @param prolepticYear the ISO proleptic year to check
385 * @return true if the year is leap, false otherwise
386 */
387 @Override
388 public boolean isLeapYear(long prolepticYear) {
389 return ((prolepticYear & 3) == 0) && ((prolepticYear % 100) != 0 || (prolepticYear % 400) == 0);
390 }
391
392 @Override
393 public int prolepticYear(Era era, int yearOfEra) {
394 if (era instanceof IsoEra == false) {
395 throw new ClassCastException("Era must be IsoEra");
396 }
397 return (era == IsoEra.CE ? yearOfEra : 1 - yearOfEra);
398 }
399
400 @Override
401 public Era eraOf(int eraValue) {
402 return IsoEra.of(eraValue);
403 }
404
405 @Override
406 public List<Era> eras() {
407 return Arrays.<Era>asList(IsoEra.values());
408 }
409
410 //-----------------------------------------------------------------------
411 /**
412 * Resolves parsed {@code ChronoField} values into a date during parsing.
413 * <p>
414 * Most {@code TemporalField} implementations are resolved using the
415 * resolve method on the field. By contrast, the {@code ChronoField} class
416 * defines fields that only have meaning relative to the chronology.
417 * As such, {@code ChronoField} date fields are resolved here in the
418 * context of a specific chronology.
419 * <p>
420 * {@code ChronoField} instances on the ISO calendar system are resolved
421 * as follows.
422 * <ul>
423 * <li>{@code EPOCH_DAY} - If present, this is converted to a {@code LocalDate}
424 * all other date fields are then cross-checked against the date
425 * <li>{@code PROLEPTIC_MONTH} - If present, then it is split into the
426 * {@code YEAR} and {@code MONTH_OF_YEAR}. If the mode is strict or smart
427 * then the field is validated.
428 * <li>{@code YEAR_OF_ERA} and {@code ERA} - If both are present, then they
429 * are combined to form a {@code YEAR}. In lenient mode, the {@code YEAR_OF_ERA}
430 * range is not validated, in smart and strict mode it is. The {@code ERA} is
431 * validated for range in all three modes. If only the {@code YEAR_OF_ERA} is
432 * present, and the mode is smart or lenient, then the current era (CE/AD)
433 * is assumed. In strict mode, no ers is assumed and the {@code YEAR_OF_ERA} is
434 * left untouched. If only the {@code ERA} is present, then it is left untouched.
435 * <li>{@code YEAR}, {@code MONTH_OF_YEAR} and {@code DAY_OF_MONTH} -
436 * If all three are present, then they are combined to form a {@code LocalDate}.
437 * In all three modes, the {@code YEAR} is validated. If the mode is smart or strict,
438 * then the month and day are validated, with the day validated from 1 to 31.
439 * If the mode is lenient, then the date is combined in a manner equivalent to
440 * creating a date on the first of January in the requested year, then adding
441 * the difference in months, then the difference in days.
442 * If the mode is smart, and the day-of-month is greater than the maximum for
443 * the year-month, then the day-of-month is adjusted to the last day-of-month.
444 * If the mode is strict, then the three fields must form a valid date.
445 * <li>{@code YEAR} and {@code DAY_OF_YEAR} -
446 * If both are present, then they are combined to form a {@code LocalDate}.
447 * In all three modes, the {@code YEAR} is validated.
448 * If the mode is lenient, then the date is combined in a manner equivalent to
449 * creating a date on the first of January in the requested year, then adding
450 * the difference in days.
451 * If the mode is smart or strict, then the two fields must form a valid date.
452 * <li>{@code YEAR}, {@code MONTH_OF_YEAR}, {@code ALIGNED_WEEK_OF_MONTH} and
453 * {@code ALIGNED_DAY_OF_WEEK_IN_MONTH} -
454 * If all four are present, then they are combined to form a {@code LocalDate}.
455 * In all three modes, the {@code YEAR} is validated.
456 * If the mode is lenient, then the date is combined in a manner equivalent to
457 * creating a date on the first of January in the requested year, then adding
458 * the difference in months, then the difference in weeks, then in days.
459 * If the mode is smart or strict, then the all four fields are validated to
460 * their outer ranges. The date is then combined in a manner equivalent to
461 * creating a date on the first day of the requested year and month, then adding
462 * the amount in weeks and days to reach their values. If the mode is strict,
463 * the date is additionally validated to check that the day and week adjustment
464 * did not change the month.
465 * <li>{@code YEAR}, {@code MONTH_OF_YEAR}, {@code ALIGNED_WEEK_OF_MONTH} and
466 * {@code DAY_OF_WEEK} - If all four are present, then they are combined to
467 * form a {@code LocalDate}. The approach is the same as described above for
468 * years, months and weeks in {@code ALIGNED_DAY_OF_WEEK_IN_MONTH}.
469 * The day-of-week is adjusted as the next or same matching day-of-week once
470 * the years, months and weeks have been handled.
471 * <li>{@code YEAR}, {@code ALIGNED_WEEK_OF_YEAR} and {@code ALIGNED_DAY_OF_WEEK_IN_YEAR} -
472 * If all three are present, then they are combined to form a {@code LocalDate}.
473 * In all three modes, the {@code YEAR} is validated.
474 * If the mode is lenient, then the date is combined in a manner equivalent to
475 * creating a date on the first of January in the requested year, then adding
476 * the difference in weeks, then in days.
477 * If the mode is smart or strict, then the all three fields are validated to
478 * their outer ranges. The date is then combined in a manner equivalent to
479 * creating a date on the first day of the requested year, then adding
480 * the amount in weeks and days to reach their values. If the mode is strict,
481 * the date is additionally validated to check that the day and week adjustment
482 * did not change the year.
483 * <li>{@code YEAR}, {@code ALIGNED_WEEK_OF_YEAR} and {@code DAY_OF_WEEK} -
484 * If all three are present, then they are combined to form a {@code LocalDate}.
485 * The approach is the same as described above for years and weeks in
486 * {@code ALIGNED_DAY_OF_WEEK_IN_YEAR}. The day-of-week is adjusted as the
487 * next or same matching day-of-week once the years and weeks have been handled.
488 * </ul>
489 *
490 * @param fieldValues the map of fields to values, which can be updated, not null
491 * @param resolverStyle the requested type of resolve, not null
492 * @return the resolved date, null if insufficient information to create a date
493 * @throws DateTimeException if the date cannot be resolved, typically
494 * because of a conflict in the input data
495 */
496 @Override // override for performance
497 public LocalDate resolveDate(Map<TemporalField, Long> fieldValues, ResolverStyle resolverStyle) {
498 // check epoch-day before inventing era
499 if (fieldValues.containsKey(EPOCH_DAY)) {
500 return LocalDate.ofEpochDay(fieldValues.remove(EPOCH_DAY));
501 }
502
503 // fix proleptic month before inventing era
504 resolveProlepticMonth(fieldValues, resolverStyle);
505
506 // invent era if necessary to resolve year-of-era
507 resolveYearOfEra(fieldValues, resolverStyle);
508
509 // build date
510 if (fieldValues.containsKey(YEAR)) {
511 if (fieldValues.containsKey(MONTH_OF_YEAR)) {
512 if (fieldValues.containsKey(DAY_OF_MONTH)) {
513 return resolveYMD(fieldValues, resolverStyle);
514 }
515 if (fieldValues.containsKey(ALIGNED_WEEK_OF_MONTH)) {
516 if (fieldValues.containsKey(ALIGNED_DAY_OF_WEEK_IN_MONTH)) {
517 return resolveYMAA(fieldValues, resolverStyle);
518 }
519 if (fieldValues.containsKey(DAY_OF_WEEK)) {
520 return resolveYMAD(fieldValues, resolverStyle);
521 }
522 }
523 }
524 if (fieldValues.containsKey(DAY_OF_YEAR)) {
525 return resolveYD(fieldValues, resolverStyle);
526 }
527 if (fieldValues.containsKey(ALIGNED_WEEK_OF_YEAR)) {
528 if (fieldValues.containsKey(ALIGNED_DAY_OF_WEEK_IN_YEAR)) {
529 return resolveYAA(fieldValues, resolverStyle);
530 }
531 if (fieldValues.containsKey(DAY_OF_WEEK)) {
532 return resolveYAD(fieldValues, resolverStyle);
533 }
534 }
535 }
536 return null;
537 }
538
539 private void resolveProlepticMonth(Map<TemporalField, Long> fieldValues, ResolverStyle resolverStyle) {
540 Long pMonth = fieldValues.remove(PROLEPTIC_MONTH);
541 if (pMonth != null) {
542 if (resolverStyle != ResolverStyle.LENIENT) {
543 PROLEPTIC_MONTH.checkValidValue(pMonth);
544 }
545 addFieldValue(fieldValues, MONTH_OF_YEAR, Math.floorMod(pMonth, 12) + 1);
546 addFieldValue(fieldValues, YEAR, Math.floorDiv(pMonth, 12));
547 }
548 }
549
550 private void resolveYearOfEra(Map<TemporalField, Long> fieldValues, ResolverStyle resolverStyle) {
551 Long yoeLong = fieldValues.remove(YEAR_OF_ERA);
552 if (yoeLong != null) {
553 if (resolverStyle != ResolverStyle.LENIENT) {
554 YEAR_OF_ERA.checkValidValue(yoeLong);
555 }
556 Long era = fieldValues.remove(ERA);
557 if (era == null) {
558 Long year = fieldValues.get(YEAR);
559 if (resolverStyle == ResolverStyle.STRICT) {
560 // do not invent era if strict, but do cross-check with year
561 if (year != null) {
562 addFieldValue(fieldValues, YEAR, (year > 0 ? yoeLong: Math.subtractExact(1, yoeLong)));
563 } else {
564 // reinstate the field removed earlier, no cross-check issues
565 fieldValues.put(YEAR_OF_ERA, yoeLong);
566 }
567 } else {
568 // invent era
569 addFieldValue(fieldValues, YEAR, (year == null || year > 0 ? yoeLong: Math.subtractExact(1, yoeLong)));
570 }
571 } else if (era.longValue() == 1L) {
572 addFieldValue(fieldValues, YEAR, yoeLong);
573 } else if (era.longValue() == 0L) {
574 addFieldValue(fieldValues, YEAR, Math.subtractExact(1, yoeLong));
575 } else {
576 throw new DateTimeException("Invalid value for era: " + era);
577 }
578 }
579 }
580
581 private LocalDate resolveYMD(Map<TemporalField, Long> fieldValues, ResolverStyle resolverStyle) {
582 int y = YEAR.checkValidIntValue(fieldValues.remove(YEAR));
583 if (resolverStyle == ResolverStyle.LENIENT) {
584 long months = Math.subtractExact(fieldValues.remove(MONTH_OF_YEAR), 1);
585 long days = Math.subtractExact(fieldValues.remove(DAY_OF_MONTH), 1);
586 return LocalDate.of(y, 1, 1).plusMonths(months).plusDays(days);
587 }
588 int moy = MONTH_OF_YEAR.checkValidIntValue(fieldValues.remove(MONTH_OF_YEAR));
589 int dom = DAY_OF_MONTH.checkValidIntValue(fieldValues.remove(DAY_OF_MONTH));
590 if (resolverStyle == ResolverStyle.SMART) { // previous valid
591 dom = Math.min(dom, Month.of(moy).length(Year.isLeap(y)));
592 }
593 return LocalDate.of(y, moy, dom);
594 }
595
596 private LocalDate resolveYD(Map<TemporalField, Long> fieldValues, ResolverStyle resolverStyle) {
597 int y = YEAR.checkValidIntValue(fieldValues.remove(YEAR));
598 if (resolverStyle == ResolverStyle.LENIENT) {
599 long days = Math.subtractExact(fieldValues.remove(DAY_OF_YEAR), 1);
600 return LocalDate.of(y, 1, 1).plusDays(days);
601 }
602 int doy = DAY_OF_YEAR.checkValidIntValue(fieldValues.remove(DAY_OF_YEAR));
603 return LocalDate.ofYearDay(y, doy); // smart is same as strict
604 }
605
606 private LocalDate resolveYMAA(Map<TemporalField, Long> fieldValues, ResolverStyle resolverStyle) {
607 int y = YEAR.checkValidIntValue(fieldValues.remove(YEAR));
608 if (resolverStyle == ResolverStyle.LENIENT) {
609 long months = Math.subtractExact(fieldValues.remove(MONTH_OF_YEAR), 1);
610 long weeks = Math.subtractExact(fieldValues.remove(ALIGNED_WEEK_OF_MONTH), 1);
611 long days = Math.subtractExact(fieldValues.remove(ALIGNED_DAY_OF_WEEK_IN_MONTH), 1);
612 return LocalDate.of(y, 1, 1).plusMonths(months).plusWeeks(weeks).plusDays(days);
613 }
614 int moy = MONTH_OF_YEAR.checkValidIntValue(fieldValues.remove(MONTH_OF_YEAR));
615 int aw = ALIGNED_WEEK_OF_MONTH.checkValidIntValue(fieldValues.remove(ALIGNED_WEEK_OF_MONTH));
616 int ad = ALIGNED_DAY_OF_WEEK_IN_MONTH.checkValidIntValue(fieldValues.remove(ALIGNED_DAY_OF_WEEK_IN_MONTH));
617 LocalDate date = LocalDate.of(y, moy, 1).plusDays((aw - 1) * 7 + (ad - 1));
618 if (resolverStyle == ResolverStyle.STRICT && date.getMonthValue() != moy) {
619 throw new DateTimeException("Strict mode rejected resolved date as it is in a different month");
620 }
621 return date;
622 }
623
624 private LocalDate resolveYMAD(Map<TemporalField, Long> fieldValues, ResolverStyle resolverStyle) {
625 int y = YEAR.checkValidIntValue(fieldValues.remove(YEAR));
626 if (resolverStyle == ResolverStyle.LENIENT) {
627 long months = Math.subtractExact(fieldValues.remove(MONTH_OF_YEAR), 1);
628 long weeks = Math.subtractExact(fieldValues.remove(ALIGNED_WEEK_OF_MONTH), 1);
629 long dow = Math.subtractExact(fieldValues.remove(DAY_OF_WEEK), 1);
630 return resolveAligned(y, months, weeks, dow);
631 }
632 int moy = MONTH_OF_YEAR.checkValidIntValue(fieldValues.remove(MONTH_OF_YEAR));
633 int aw = ALIGNED_WEEK_OF_MONTH.checkValidIntValue(fieldValues.remove(ALIGNED_WEEK_OF_MONTH));
634 int dow = DAY_OF_WEEK.checkValidIntValue(fieldValues.remove(DAY_OF_WEEK));
635 LocalDate date = LocalDate.of(y, moy, 1).plusDays((aw - 1) * 7).with(nextOrSame(DayOfWeek.of(dow)));
636 if (resolverStyle == ResolverStyle.STRICT && date.getMonthValue() != moy) {
637 throw new DateTimeException("Strict mode rejected resolved date as it is in a different month");
638 }
639 return date;
640 }
641
642 private LocalDate resolveYAA(Map<TemporalField, Long> fieldValues, ResolverStyle resolverStyle) {
643 int y = YEAR.checkValidIntValue(fieldValues.remove(YEAR));
644 if (resolverStyle == ResolverStyle.LENIENT) {
645 long weeks = Math.subtractExact(fieldValues.remove(ALIGNED_WEEK_OF_YEAR), 1);
646 long days = Math.subtractExact(fieldValues.remove(ALIGNED_DAY_OF_WEEK_IN_YEAR), 1);
647 return LocalDate.of(y, 1, 1).plusWeeks(weeks).plusDays(days);
648 }
649 int aw = ALIGNED_WEEK_OF_YEAR.checkValidIntValue(fieldValues.remove(ALIGNED_WEEK_OF_YEAR));
650 int ad = ALIGNED_DAY_OF_WEEK_IN_YEAR.checkValidIntValue(fieldValues.remove(ALIGNED_DAY_OF_WEEK_IN_YEAR));
651 LocalDate date = LocalDate.of(y, 1, 1).plusDays((aw - 1) * 7 + (ad - 1));
652 if (resolverStyle == ResolverStyle.STRICT && date.getYear() != y) {
653 throw new DateTimeException("Strict mode rejected resolved date as it is in a different year");
654 }
655 return date;
656 }
657
658 private LocalDate resolveYAD(Map<TemporalField, Long> fieldValues, ResolverStyle resolverStyle) {
659 int y = YEAR.checkValidIntValue(fieldValues.remove(YEAR));
660 if (resolverStyle == ResolverStyle.LENIENT) {
661 long weeks = Math.subtractExact(fieldValues.remove(ALIGNED_WEEK_OF_YEAR), 1);
662 long dow = Math.subtractExact(fieldValues.remove(DAY_OF_WEEK), 1);
663 return resolveAligned(y, 0, weeks, dow);
664 }
665 int aw = ALIGNED_WEEK_OF_YEAR.checkValidIntValue(fieldValues.remove(ALIGNED_WEEK_OF_YEAR));
666 int dow = DAY_OF_WEEK.checkValidIntValue(fieldValues.remove(DAY_OF_WEEK));
667 LocalDate date = LocalDate.of(y, 1, 1).plusDays((aw - 1) * 7).with(nextOrSame(DayOfWeek.of(dow)));
668 if (resolverStyle == ResolverStyle.STRICT && date.getYear() != y) {
669 throw new DateTimeException("Strict mode rejected resolved date as it is in a different year");
670 }
671 return date;
672 }
673
674 private LocalDate resolveAligned(int y, long months, long weeks, long dow) {
675 LocalDate date = LocalDate.of(y, 1, 1).plusMonths(months).plusWeeks(weeks);
676 if (dow > 7) {
677 date = date.plusWeeks((dow - 1) / 7);
678 dow = ((dow - 1) % 7) + 1;
679 } else if (dow < 1) {
680 date = date.plusWeeks(Math.subtractExact(dow, 7) / 7);
681 dow = ((dow + 6) % 7) + 1;
682 }
683 return date.with(nextOrSame(DayOfWeek.of((int) dow)));
684 }
685
686 //-----------------------------------------------------------------------
687 @Override
688 public ValueRange range(ChronoField field) {
689 return field.range();
690 }
691
692 }