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.DAY_OF_MONTH;
65 import static java.time.temporal.ChronoField.ERA;
66 import static java.time.temporal.ChronoField.MONTH_OF_YEAR;
67 import static java.time.temporal.ChronoField.PROLEPTIC_MONTH;
68 import static java.time.temporal.ChronoField.YEAR;
69 import static java.time.temporal.ChronoField.YEAR_OF_ERA;
70
71 import java.io.Serializable;
72 import java.time.Clock;
73 import java.time.DateTimeException;
74 import java.time.Instant;
75 import java.time.LocalDate;
76 import java.time.LocalDateTime;
77 import java.time.Month;
78 import java.time.Year;
79 import java.time.ZoneId;
80 import java.time.ZonedDateTime;
81 import java.time.format.ResolverStyle;
82 import java.time.temporal.ChronoField;
83 import java.time.temporal.TemporalAccessor;
84 import java.time.temporal.TemporalField;
85 import java.time.temporal.ValueRange;
86 import java.util.Arrays;
87 import java.util.List;
88 import java.util.Locale;
89 import java.util.Map;
90 import java.util.Objects;
91
92 /**
93 * The ISO calendar system.
94 * <p>
95 * This chronology defines the rules of the ISO calendar system.
96 * This calendar system is based on the ISO-8601 standard, which is the
97 * <i>de facto</i> world calendar.
98 * <p>
99 * The fields are defined as follows:
100 * <p><ul>
101 * <li>era - There are two eras, 'Current Era' (CE) and 'Before Current Era' (BCE).
102 * <li>year-of-era - The year-of-era is the same as the proleptic-year for the current CE era.
103 * For the BCE era before the ISO epoch the year increases from 1 upwards as time goes backwards.
104 * <li>proleptic-year - The proleptic year is the same as the year-of-era for the
105 * current era. For the previous era, years have zero, then negative values.
106 * <li>month-of-year - There are 12 months in an ISO year, numbered from 1 to 12.
107 * <li>day-of-month - There are between 28 and 31 days in each of the ISO month, numbered from 1 to 31.
108 * Months 4, 6, 9 and 11 have 30 days, Months 1, 3, 5, 7, 8, 10 and 12 have 31 days.
109 * Month 2 has 28 days, or 29 in a leap year.
110 * <li>day-of-year - There are 365 days in a standard ISO year and 366 in a leap year.
111 * The days are numbered from 1 to 365 or 1 to 366.
112 * <li>leap-year - Leap years occur every 4 years, except where the year is divisble by 100 and not divisble by 400.
113 * </ul><p>
114 *
115 * @implSpec
116 * This class is immutable and thread-safe.
117 *
118 * @since 1.8
119 */
120 public final class IsoChronology extends Chronology implements Serializable {
121
122 /**
123 * Singleton instance of the ISO chronology.
124 */
125 public static final IsoChronology INSTANCE = new IsoChronology();
126
127 /**
128 * Serialization version.
129 */
130 private static final long serialVersionUID = -1440403870442975015L;
131
132 /**
133 * Restricted constructor.
134 */
135 private IsoChronology() {
136 }
137
138 //-----------------------------------------------------------------------
139 /**
140 * Gets the ID of the chronology - 'ISO'.
141 * <p>
142 * The ID uniquely identifies the {@code Chronology}.
143 * It can be used to lookup the {@code Chronology} using {@link #of(String)}.
144 *
145 * @return the chronology ID - 'ISO'
146 * @see #getCalendarType()
147 */
148 @Override
149 public String getId() {
150 return "ISO";
151 }
152
153 /**
154 * Gets the calendar type of the underlying calendar system - 'iso8601'.
155 * <p>
156 * The calendar type is an identifier defined by the
157 * <em>Unicode Locale Data Markup Language (LDML)</em> specification.
158 * It can be used to lookup the {@code Chronology} using {@link #of(String)}.
159 * It can also be used as part of a locale, accessible via
160 * {@link Locale#getUnicodeLocaleType(String)} with the key 'ca'.
161 *
162 * @return the calendar system type - 'iso8601'
163 * @see #getId()
164 */
165 @Override
166 public String getCalendarType() {
167 return "iso8601";
168 }
169
170 //-----------------------------------------------------------------------
171 /**
172 * Obtains an ISO local date from the era, year-of-era, month-of-year
173 * and day-of-month fields.
174 *
175 * @param era the ISO era, not null
176 * @param yearOfEra the ISO year-of-era
177 * @param month the ISO month-of-year
178 * @param dayOfMonth the ISO day-of-month
179 * @return the ISO local date, not null
180 * @throws DateTimeException if unable to create the date
181 * @throws ClassCastException if the type of {@code era} is not {@code IsoEra}
182 */
183 @Override // override with covariant return type
184 public LocalDate date(Era era, int yearOfEra, int month, int dayOfMonth) {
185 return date(prolepticYear(era, yearOfEra), month, dayOfMonth);
186 }
187
188 /**
189 * Obtains an ISO local date from the proleptic-year, month-of-year
190 * and day-of-month fields.
191 * <p>
192 * This is equivalent to {@link LocalDate#of(int, int, int)}.
193 *
194 * @param prolepticYear the ISO proleptic-year
195 * @param month the ISO month-of-year
196 * @param dayOfMonth the ISO day-of-month
197 * @return the ISO local date, not null
198 * @throws DateTimeException if unable to create the date
199 */
200 @Override // override with covariant return type
201 public LocalDate date(int prolepticYear, int month, int dayOfMonth) {
202 return LocalDate.of(prolepticYear, month, dayOfMonth);
203 }
204
205 /**
206 * Obtains an ISO local date from the era, year-of-era and day-of-year fields.
207 *
208 * @param era the ISO era, not null
209 * @param yearOfEra the ISO year-of-era
210 * @param dayOfYear the ISO day-of-year
211 * @return the ISO local date, not null
212 * @throws DateTimeException if unable to create the date
213 */
214 @Override // override with covariant return type
215 public LocalDate dateYearDay(Era era, int yearOfEra, int dayOfYear) {
216 return dateYearDay(prolepticYear(era, yearOfEra), dayOfYear);
217 }
218
219 /**
220 * Obtains an ISO local date from the proleptic-year and day-of-year fields.
221 * <p>
222 * This is equivalent to {@link LocalDate#ofYearDay(int, int)}.
223 *
224 * @param prolepticYear the ISO proleptic-year
225 * @param dayOfYear the ISO day-of-year
226 * @return the ISO local date, not null
227 * @throws DateTimeException if unable to create the date
228 */
229 @Override // override with covariant return type
230 public LocalDate dateYearDay(int prolepticYear, int dayOfYear) {
231 return LocalDate.ofYearDay(prolepticYear, dayOfYear);
232 }
233
234 /**
235 * Obtains an ISO local date from the epoch-day.
236 * <p>
237 * This is equivalent to {@link LocalDate#ofEpochDay(long)}.
238 *
239 * @param epochDay the epoch day
240 * @return the ISO local date, not null
241 * @throws DateTimeException if unable to create the date
242 */
243 @Override // override with covariant return type
244 public LocalDate dateEpochDay(long epochDay) {
245 return LocalDate.ofEpochDay(epochDay);
246 }
247
248 //-----------------------------------------------------------------------
249 /**
250 * Obtains an ISO local date from another date-time object.
251 * <p>
252 * This is equivalent to {@link LocalDate#from(TemporalAccessor)}.
253 *
254 * @param temporal the date-time object to convert, not null
255 * @return the ISO local date, not null
256 * @throws DateTimeException if unable to create the date
257 */
258 @Override // override with covariant return type
259 public LocalDate date(TemporalAccessor temporal) {
260 return LocalDate.from(temporal);
261 }
262
263 /**
264 * Obtains an ISO local date-time from another date-time object.
265 * <p>
266 * This is equivalent to {@link LocalDateTime#from(TemporalAccessor)}.
267 *
268 * @param temporal the date-time object to convert, not null
269 * @return the ISO local date-time, not null
270 * @throws DateTimeException if unable to create the date-time
271 */
272 @Override // override with covariant return type
273 public LocalDateTime localDateTime(TemporalAccessor temporal) {
274 return LocalDateTime.from(temporal);
275 }
276
277 /**
278 * Obtains an ISO zoned date-time from another date-time object.
279 * <p>
280 * This is equivalent to {@link ZonedDateTime#from(TemporalAccessor)}.
281 *
282 * @param temporal the date-time object to convert, not null
283 * @return the ISO zoned date-time, not null
284 * @throws DateTimeException if unable to create the date-time
285 */
286 @Override // override with covariant return type
287 public ZonedDateTime zonedDateTime(TemporalAccessor temporal) {
288 return ZonedDateTime.from(temporal);
289 }
290
291 /**
292 * Obtains an ISO zoned date-time in this chronology from an {@code Instant}.
293 * <p>
294 * This is equivalent to {@link ZonedDateTime#ofInstant(Instant, ZoneId)}.
295 *
296 * @param instant the instant to create the date-time from, not null
297 * @param zone the time-zone, not null
298 * @return the zoned date-time, not null
299 * @throws DateTimeException if the result exceeds the supported range
300 */
301 @Override
302 public ZonedDateTime zonedDateTime(Instant instant, ZoneId zone) {
303 return ZonedDateTime.ofInstant(instant, zone);
304 }
305
306 //-----------------------------------------------------------------------
307 /**
308 * Obtains the current ISO local date from the system clock in the default time-zone.
309 * <p>
310 * This will query the {@link Clock#systemDefaultZone() system clock} in the default
311 * time-zone to obtain the current date.
312 * <p>
313 * Using this method will prevent the ability to use an alternate clock for testing
314 * because the clock is hard-coded.
315 *
316 * @return the current ISO local date using the system clock and default time-zone, not null
317 * @throws DateTimeException if unable to create the date
318 */
319 @Override // override with covariant return type
320 public LocalDate dateNow() {
321 return dateNow(Clock.systemDefaultZone());
322 }
323
324 /**
325 * Obtains the current ISO local date from the system clock in the specified time-zone.
326 * <p>
327 * This will query the {@link Clock#system(ZoneId) system clock} to obtain the current date.
328 * Specifying the time-zone avoids dependence on the default time-zone.
329 * <p>
330 * Using this method will prevent the ability to use an alternate clock for testing
331 * because the clock is hard-coded.
332 *
333 * @return the current ISO local date using the system clock, not null
334 * @throws DateTimeException if unable to create the date
335 */
336 @Override // override with covariant return type
337 public LocalDate dateNow(ZoneId zone) {
338 return dateNow(Clock.system(zone));
339 }
340
341 /**
342 * Obtains the current ISO local date from the specified clock.
343 * <p>
344 * This will query the specified clock to obtain the current date - today.
345 * Using this method allows the use of an alternate clock for testing.
346 * The alternate clock may be introduced using {@link Clock dependency injection}.
347 *
348 * @param clock the clock to use, not null
349 * @return the current ISO local date, not null
350 * @throws DateTimeException if unable to create the date
351 */
352 @Override // override with covariant return type
353 public LocalDate dateNow(Clock clock) {
354 Objects.requireNonNull(clock, "clock");
355 return date(LocalDate.now(clock));
356 }
357
358 //-----------------------------------------------------------------------
359 /**
360 * Checks if the year is a leap year, according to the ISO proleptic
361 * calendar system rules.
362 * <p>
363 * This method applies the current rules for leap years across the whole time-line.
364 * In general, a year is a leap year if it is divisible by four without
365 * remainder. However, years divisible by 100, are not leap years, with
366 * the exception of years divisible by 400 which are.
367 * <p>
368 * For example, 1904 is a leap year it is divisible by 4.
369 * 1900 was not a leap year as it is divisible by 100, however 2000 was a
370 * leap year as it is divisible by 400.
371 * <p>
372 * The calculation is proleptic - applying the same rules into the far future and far past.
373 * This is historically inaccurate, but is correct for the ISO-8601 standard.
374 *
375 * @param prolepticYear the ISO proleptic year to check
376 * @return true if the year is leap, false otherwise
377 */
378 @Override
379 public boolean isLeapYear(long prolepticYear) {
380 return ((prolepticYear & 3) == 0) && ((prolepticYear % 100) != 0 || (prolepticYear % 400) == 0);
381 }
382
383 @Override
384 public int prolepticYear(Era era, int yearOfEra) {
385 if (era instanceof IsoEra == false) {
386 throw new ClassCastException("Era must be IsoEra");
387 }
388 return (era == IsoEra.CE ? yearOfEra : 1 - yearOfEra);
389 }
390
391 @Override
392 public IsoEra eraOf(int eraValue) {
393 return IsoEra.of(eraValue);
394 }
395
396 @Override
397 public List<Era> eras() {
398 return Arrays.<Era>asList(IsoEra.values());
399 }
400
401 //-----------------------------------------------------------------------
402 /**
403 * Resolves parsed {@code ChronoField} values into a date during parsing.
404 * <p>
405 * Most {@code TemporalField} implementations are resolved using the
406 * resolve method on the field. By contrast, the {@code ChronoField} class
407 * defines fields that only have meaning relative to the chronology.
408 * As such, {@code ChronoField} date fields are resolved here in the
409 * context of a specific chronology.
410 * <p>
411 * {@code ChronoField} instances on the ISO calendar system are resolved
412 * as follows.
413 * <ul>
414 * <li>{@code EPOCH_DAY} - If present, this is converted to a {@code LocalDate}
415 * and all other date fields are then cross-checked against the date.
416 * <li>{@code PROLEPTIC_MONTH} - If present, then it is split into the
417 * {@code YEAR} and {@code MONTH_OF_YEAR}. If the mode is strict or smart
418 * then the field is validated.
419 * <li>{@code YEAR_OF_ERA} and {@code ERA} - If both are present, then they
420 * are combined to form a {@code YEAR}. In lenient mode, the {@code YEAR_OF_ERA}
421 * range is not validated, in smart and strict mode it is. The {@code ERA} is
422 * validated for range in all three modes. If only the {@code YEAR_OF_ERA} is
423 * present, and the mode is smart or lenient, then the current era (CE/AD)
424 * is assumed. In strict mode, no era is assumed and the {@code YEAR_OF_ERA} is
425 * left untouched. If only the {@code ERA} is present, then it is left untouched.
426 * <li>{@code YEAR}, {@code MONTH_OF_YEAR} and {@code DAY_OF_MONTH} -
427 * If all three are present, then they are combined to form a {@code LocalDate}.
428 * In all three modes, the {@code YEAR} is validated. If the mode is smart or strict,
429 * then the month and day are validated, with the day validated from 1 to 31.
430 * If the mode is lenient, then the date is combined in a manner equivalent to
431 * creating a date on the first of January in the requested year, then adding
432 * the difference in months, then the difference in days.
433 * If the mode is smart, and the day-of-month is greater than the maximum for
434 * the year-month, then the day-of-month is adjusted to the last day-of-month.
435 * If the mode is strict, then the three fields must form a valid date.
436 * <li>{@code YEAR} and {@code DAY_OF_YEAR} -
437 * If both are present, then they are combined to form a {@code LocalDate}.
438 * In all three modes, the {@code YEAR} is validated.
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 days.
442 * If the mode is smart or strict, then the two fields must form a valid date.
443 * <li>{@code YEAR}, {@code MONTH_OF_YEAR}, {@code ALIGNED_WEEK_OF_MONTH} and
444 * {@code ALIGNED_DAY_OF_WEEK_IN_MONTH} -
445 * If all four are present, then they are combined to form a {@code LocalDate}.
446 * In all three modes, the {@code YEAR} is validated.
447 * If the mode is lenient, then the date is combined in a manner equivalent to
448 * creating a date on the first of January in the requested year, then adding
449 * the difference in months, then the difference in weeks, then in days.
450 * If the mode is smart or strict, then the all four fields are validated to
451 * their outer ranges. The date is then combined in a manner equivalent to
452 * creating a date on the first day of the requested year and month, then adding
453 * the amount in weeks and days to reach their values. If the mode is strict,
454 * the date is additionally validated to check that the day and week adjustment
455 * did not change the month.
456 * <li>{@code YEAR}, {@code MONTH_OF_YEAR}, {@code ALIGNED_WEEK_OF_MONTH} and
457 * {@code DAY_OF_WEEK} - If all four are present, then they are combined to
458 * form a {@code LocalDate}. The approach is the same as described above for
459 * years, months and weeks in {@code ALIGNED_DAY_OF_WEEK_IN_MONTH}.
460 * The day-of-week is adjusted as the next or same matching day-of-week once
461 * the years, months and weeks have been handled.
462 * <li>{@code YEAR}, {@code ALIGNED_WEEK_OF_YEAR} and {@code ALIGNED_DAY_OF_WEEK_IN_YEAR} -
463 * If all three are present, then they are combined to form a {@code LocalDate}.
464 * In all three modes, the {@code YEAR} is validated.
465 * If the mode is lenient, then the date is combined in a manner equivalent to
466 * creating a date on the first of January in the requested year, then adding
467 * the difference in weeks, then in days.
468 * If the mode is smart or strict, then the all three fields are validated to
469 * their outer ranges. The date is then combined in a manner equivalent to
470 * creating a date on the first day of the requested year, then adding
471 * the amount in weeks and days to reach their values. If the mode is strict,
472 * the date is additionally validated to check that the day and week adjustment
473 * did not change the year.
474 * <li>{@code YEAR}, {@code ALIGNED_WEEK_OF_YEAR} and {@code DAY_OF_WEEK} -
475 * If all three are present, then they are combined to form a {@code LocalDate}.
476 * The approach is the same as described above for years and weeks in
477 * {@code ALIGNED_DAY_OF_WEEK_IN_YEAR}. The day-of-week is adjusted as the
478 * next or same matching day-of-week once the years and weeks have been handled.
479 * </ul>
480 *
481 * @param fieldValues the map of fields to values, which can be updated, not null
482 * @param resolverStyle the requested type of resolve, not null
483 * @return the resolved date, null if insufficient information to create a date
484 * @throws DateTimeException if the date cannot be resolved, typically
485 * because of a conflict in the input data
486 */
487 @Override // override for performance
488 public LocalDate resolveDate(Map<TemporalField, Long> fieldValues, ResolverStyle resolverStyle) {
489 return (LocalDate) super.resolveDate(fieldValues, resolverStyle);
490 }
491
492 @Override // override for better proleptic algorithm
493 void resolveProlepticMonth(Map<TemporalField, Long> fieldValues, ResolverStyle resolverStyle) {
494 Long pMonth = fieldValues.remove(PROLEPTIC_MONTH);
495 if (pMonth != null) {
496 if (resolverStyle != ResolverStyle.LENIENT) {
497 PROLEPTIC_MONTH.checkValidValue(pMonth);
498 }
499 addFieldValue(fieldValues, MONTH_OF_YEAR, Math.floorMod(pMonth, 12) + 1);
500 addFieldValue(fieldValues, YEAR, Math.floorDiv(pMonth, 12));
501 }
502 }
503
504 @Override // override for enhanced behaviour
505 LocalDate resolveYearOfEra(Map<TemporalField, Long> fieldValues, ResolverStyle resolverStyle) {
506 Long yoeLong = fieldValues.remove(YEAR_OF_ERA);
507 if (yoeLong != null) {
508 if (resolverStyle != ResolverStyle.LENIENT) {
509 YEAR_OF_ERA.checkValidValue(yoeLong);
510 }
511 Long era = fieldValues.remove(ERA);
512 if (era == null) {
513 Long year = fieldValues.get(YEAR);
514 if (resolverStyle == ResolverStyle.STRICT) {
515 // do not invent era if strict, but do cross-check with year
516 if (year != null) {
517 addFieldValue(fieldValues, YEAR, (year > 0 ? yoeLong: Math.subtractExact(1, yoeLong)));
518 } else {
519 // reinstate the field removed earlier, no cross-check issues
520 fieldValues.put(YEAR_OF_ERA, yoeLong);
521 }
522 } else {
523 // invent era
524 addFieldValue(fieldValues, YEAR, (year == null || year > 0 ? yoeLong: Math.subtractExact(1, yoeLong)));
525 }
526 } else if (era.longValue() == 1L) {
527 addFieldValue(fieldValues, YEAR, yoeLong);
528 } else if (era.longValue() == 0L) {
529 addFieldValue(fieldValues, YEAR, Math.subtractExact(1, yoeLong));
530 } else {
531 throw new DateTimeException("Invalid value for era: " + era);
532 }
533 } else if (fieldValues.containsKey(ERA)) {
534 ERA.checkValidValue(fieldValues.get(ERA)); // always validated
535 }
536 return null;
537 }
538
539 @Override // override for performance
540 LocalDate resolveYMD(Map <TemporalField, Long> fieldValues, ResolverStyle resolverStyle) {
541 int y = YEAR.checkValidIntValue(fieldValues.remove(YEAR));
542 if (resolverStyle == ResolverStyle.LENIENT) {
543 long months = Math.subtractExact(fieldValues.remove(MONTH_OF_YEAR), 1);
544 long days = Math.subtractExact(fieldValues.remove(DAY_OF_MONTH), 1);
545 return LocalDate.of(y, 1, 1).plusMonths(months).plusDays(days);
546 }
547 int moy = MONTH_OF_YEAR.checkValidIntValue(fieldValues.remove(MONTH_OF_YEAR));
548 int dom = DAY_OF_MONTH.checkValidIntValue(fieldValues.remove(DAY_OF_MONTH));
549 if (resolverStyle == ResolverStyle.SMART) { // previous valid
550 if (moy == 4 || moy == 6 || moy == 9 || moy == 11) {
551 dom = Math.min(dom, 30);
552 } else if (moy == 2) {
553 dom = Math.min(dom, Month.FEBRUARY.length(Year.isLeap(y)));
554
555 }
556 }
557 return LocalDate.of(y, moy, dom);
558 }
559
560 //-----------------------------------------------------------------------
561 @Override
562 public ValueRange range(ChronoField field) {
563 return field.range();
564 }
565
566 }