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.DAY_OF_MONTH;
60 import static java.time.temporal.ChronoField.MONTH_OF_YEAR;
61 import static java.time.temporal.ChronoField.YEAR;
62
63 import java.io.DataInput;
64 import java.io.DataOutput;
65 import java.io.IOException;
66 import java.io.Serializable;
67 import java.time.Clock;
68 import java.time.DateTimeException;
69 import java.time.LocalDate;
70 import java.time.LocalTime;
71 import java.time.Period;
72 import java.time.Year;
73 import java.time.ZoneId;
74 import java.time.temporal.ChronoField;
75 import java.time.temporal.TemporalAccessor;
76 import java.time.temporal.TemporalAdjuster;
77 import java.time.temporal.TemporalAmount;
78 import java.time.temporal.TemporalField;
79 import java.time.temporal.TemporalQuery;
80 import java.time.temporal.TemporalUnit;
81 import java.time.temporal.UnsupportedTemporalTypeException;
82 import java.time.temporal.ValueRange;
83 import java.util.Calendar;
84 import java.util.Objects;
85
86 import sun.util.calendar.LocalGregorianCalendar;
87
88 /**
89 * A date in the Japanese Imperial calendar system.
90 * <p>
91 * This date operates using the {@linkplain JapaneseChronology Japanese Imperial calendar}.
92 * This calendar system is primarily used in Japan.
93 * <p>
94 * The Japanese Imperial calendar system is the same as the ISO calendar system
95 * apart from the era-based year numbering. The proleptic-year is defined to be
96 * equal to the ISO proleptic-year.
97 * <p>
98 * For example, the Japanese year "Heisei 24" corresponds to ISO year "2012".<br>
99 * Calling {@code japaneseDate.get(YEAR_OF_ERA)} will return 24.<br>
100 * Calling {@code japaneseDate.get(YEAR)} will return 2012.<br>
101 * Calling {@code japaneseDate.get(ERA)} will return 2, corresponding to
102 * {@code JapaneseChronology.ERA_HEISEI}.<br>
103 *
104 * <h3>Specification for implementors</h3>
105 * This class is immutable and thread-safe.
106 *
107 * @since 1.8
108 */
109 public final class JapaneseDate
110 extends ChronoDateImpl<JapaneseDate>
111 implements ChronoLocalDate<JapaneseDate>, Serializable {
112
113 /**
114 * Serialization version.
115 */
116 private static final long serialVersionUID = -305327627230580483L;
117
118 /**
119 * The underlying ISO local date.
120 */
121 private transient final LocalDate isoDate;
122 /**
123 * The JapaneseEra of this date.
124 */
125 private transient JapaneseEra era;
126 /**
127 * The Japanese imperial calendar year of this date.
128 */
129 private transient int yearOfEra;
130
131 //-----------------------------------------------------------------------
132 /**
133 * Obtains the current {@code JapaneseDate} from the system clock in the default time-zone.
134 * <p>
135 * This will query the {@link Clock#systemDefaultZone() system clock} in the default
136 * time-zone to obtain the current date.
137 * <p>
138 * Using this method will prevent the ability to use an alternate clock for testing
139 * because the clock is hard-coded.
140 *
141 * @return the current date using the system clock and default time-zone, not null
142 */
143 public static JapaneseDate now() {
144 return now(Clock.systemDefaultZone());
145 }
146
147 /**
148 * Obtains the current {@code JapaneseDate} from the system clock in the specified time-zone.
149 * <p>
150 * This will query the {@link Clock#system(ZoneId) system clock} to obtain the current date.
151 * Specifying the time-zone avoids dependence on the default time-zone.
152 * <p>
153 * Using this method will prevent the ability to use an alternate clock for testing
154 * because the clock is hard-coded.
155 *
156 * @param zone the zone ID to use, not null
157 * @return the current date using the system clock, not null
158 */
159 public static JapaneseDate now(ZoneId zone) {
160 return now(Clock.system(zone));
161 }
162
163 /**
164 * Obtains the current {@code JapaneseDate} from the specified clock.
165 * <p>
166 * This will query the specified clock to obtain the current date - today.
167 * Using this method allows the use of an alternate clock for testing.
168 * The alternate clock may be introduced using {@linkplain Clock dependency injection}.
169 *
170 * @param clock the clock to use, not null
171 * @return the current date, not null
172 * @throws DateTimeException if the current date cannot be obtained
173 */
174 public static JapaneseDate now(Clock clock) {
175 return JapaneseChronology.INSTANCE.date(LocalDate.now(clock));
176 }
177
178 /**
179 * Obtains a {@code JapaneseDate} representing a date in the Japanese calendar
180 * system from the era, year-of-era, month-of-year and day-of-month fields.
181 * <p>
182 * This returns a {@code JapaneseDate} with the specified fields.
183 * The day must be valid for the year and month, otherwise an exception will be thrown.
184 *
185 * @param era the Japanese era, not null
186 * @param yearOfEra the Japanese year-of-era
187 * @param month the Japanese month-of-year, from 1 to 12
188 * @param dayOfMonth the Japanese day-of-month, from 1 to 31
189 * @return the date in Japanese calendar system, not null
190 * @throws DateTimeException if the value of any field is out of range,
191 * or if the day-of-month is invalid for the month-year,
192 * or if the date is not a Japanese era
193 */
194 public static JapaneseDate of(Era era, int yearOfEra, int month, int dayOfMonth) {
195 if (era instanceof JapaneseEra == false) {
196 throw new ClassCastException("Era must be JapaneseEra");
197 }
198 return JapaneseDate.of((JapaneseEra) era, yearOfEra, month, dayOfMonth);
199 }
200
201 /**
202 * Obtains a {@code JapaneseDate} representing a date in the Japanese calendar
203 * system from the proleptic-year, month-of-year and day-of-month fields.
204 * <p>
205 * This returns a {@code JapaneseDate} with the specified fields.
206 * The day must be valid for the year and month, otherwise an exception will be thrown.
207 *
208 * @param prolepticYear the Japanese proleptic-year
209 * @param month the Japanese month-of-year, from 1 to 12
210 * @param dayOfMonth the Japanese day-of-month, from 1 to 31
211 * @return the date in Japanese calendar system, not null
212 * @throws DateTimeException if the value of any field is out of range,
213 * or if the day-of-month is invalid for the month-year
214 */
215 public static JapaneseDate of(int prolepticYear, int month, int dayOfMonth) {
216 return new JapaneseDate(LocalDate.of(prolepticYear, month, dayOfMonth));
217 }
218
219 /**
220 * Obtains a {@code JapaneseDate} representing a date in the Japanese calendar
221 * system from the proleptic-year and day-of-year fields.
222 * <p>
223 * This returns a {@code JapaneseDate} with the specified fields.
224 * The day must be valid for the year, otherwise an exception will be thrown.
225 *
226 * @param prolepticYear the chronology proleptic-year
227 * @param dayOfYear the chronology day-of-year, from 1 to 366
228 * @return the date in Japanese calendar system, not null
229 * @throws DateTimeException if the value of any field is out of range,
230 * or if the day-of-year is invalid for the year
231 */
232 public static JapaneseDate ofYearDay(int prolepticYear, int dayOfYear) {
233 LocalDate date = LocalDate.ofYearDay(prolepticYear, dayOfYear);
234 return of(prolepticYear, date.getMonthValue(), date.getDayOfMonth());
235 }
236
237 /**
238 * Obtains a {@code JapaneseDate} representing a date in the Japanese calendar
239 * system from the era, year-of-era, month-of-year and day-of-month fields.
240 * <p>
241 * This returns a {@code JapaneseDate} with the specified fields.
242 * The day must be valid for the year and month, otherwise an exception will be thrown.
243 *
244 * @param era the Japanese era, not null
245 * @param yearOfEra the Japanese year-of-era
246 * @param month the Japanese month-of-year, from 1 to 12
247 * @param dayOfMonth the Japanese day-of-month, from 1 to 31
248 * @return the date in Japanese calendar system, not null
249 * @throws DateTimeException if the value of any field is out of range,
250 * or if the day-of-month is invalid for the month-year
251 */
252 static JapaneseDate of(JapaneseEra era, int yearOfEra, int month, int dayOfMonth) {
253 Objects.requireNonNull(era, "era");
254 LocalGregorianCalendar.Date jdate = JapaneseChronology.JCAL.newCalendarDate(null);
255 jdate.setEra(era.getPrivateEra()).setDate(yearOfEra, month, dayOfMonth);
256 if (!JapaneseChronology.JCAL.validate(jdate)) {
257 throw new DateTimeException("year, month, and day not valid for Era");
258 }
259 LocalDate date = LocalDate.of(jdate.getNormalizedYear(), month, dayOfMonth);
260 return new JapaneseDate(era, yearOfEra, date);
261 }
262
263 /**
264 * Obtains a {@code JapaneseDate} from a temporal object.
265 * <p>
266 * This obtains a date in the Japanese calendar system based on the specified temporal.
267 * A {@code TemporalAccessor} represents an arbitrary set of date and time information,
268 * which this factory converts to an instance of {@code JapaneseDate}.
269 * <p>
270 * The conversion typically uses the {@link ChronoField#EPOCH_DAY EPOCH_DAY}
271 * field, which is standardized across calendar systems.
272 * <p>
273 * This method matches the signature of the functional interface {@link TemporalQuery}
274 * allowing it to be used as a query via method reference, {@code JapaneseDate::from}.
275 *
276 * @param temporal the temporal object to convert, not null
277 * @return the date in Japanese calendar system, not null
278 * @throws DateTimeException if unable to convert to a {@code JapaneseDate}
279 */
280 public static JapaneseDate from(TemporalAccessor temporal) {
281 return JapaneseChronology.INSTANCE.date(temporal);
282 }
283
284 //-----------------------------------------------------------------------
285 /**
286 * Creates an instance from an ISO date.
287 *
288 * @param isoDate the standard local date, validated not null
289 */
290 JapaneseDate(LocalDate isoDate) {
291 LocalGregorianCalendar.Date jdate = toPrivateJapaneseDate(isoDate);
292 this.era = JapaneseEra.toJapaneseEra(jdate.getEra());
293 this.yearOfEra = jdate.getYear();
294 this.isoDate = isoDate;
295 }
296
297 /**
298 * Constructs a {@code JapaneseDate}. This constructor does NOT validate the given parameters,
299 * and {@code era} and {@code year} must agree with {@code isoDate}.
300 *
301 * @param era the era, validated not null
302 * @param year the year-of-era, validated
303 * @param isoDate the standard local date, validated not null
304 */
305 JapaneseDate(JapaneseEra era, int year, LocalDate isoDate) {
306 this.era = era;
307 this.yearOfEra = year;
308 this.isoDate = isoDate;
309 }
310
311 //-----------------------------------------------------------------------
312 /**
313 * Gets the chronology of this date, which is the Japanese calendar system.
314 * <p>
315 * The {@code Chronology} represents the calendar system in use.
316 * The era and other fields in {@link ChronoField} are defined by the chronology.
317 *
318 * @return the Japanese chronology, not null
319 */
320 @Override
321 public JapaneseChronology getChronology() {
322 return JapaneseChronology.INSTANCE;
323 }
324
325 /**
326 * Gets the era applicable at this date.
327 * <p>
328 * The Japanese calendar system has multiple eras defined by {@link JapaneseEra}.
329 *
330 * @return the era applicable at this date, not null
331 */
332 @Override
333 public JapaneseEra getEra() {
334 return era;
335 }
336
337 /**
338 * Returns the length of the month represented by this date.
339 * <p>
340 * This returns the length of the month in days.
341 * Month lengths match those of the ISO calendar system.
342 *
343 * @return the length of the month in days
344 */
345 @Override
346 public int lengthOfMonth() {
347 return isoDate.lengthOfMonth();
348 }
349
350 //-----------------------------------------------------------------------
351 @Override
352 public ValueRange range(TemporalField field) {
353 if (field instanceof ChronoField) {
354 if (isSupported(field)) {
355 ChronoField f = (ChronoField) field;
356 switch (f) {
357 case DAY_OF_MONTH:
358 case ALIGNED_WEEK_OF_MONTH:
359 return isoDate.range(field);
360 case DAY_OF_YEAR:
361 return actualRange(Calendar.DAY_OF_YEAR);
362 case YEAR_OF_ERA:
363 return actualRange(Calendar.YEAR);
364 }
365 return getChronology().range(f);
366 }
367 throw new UnsupportedTemporalTypeException("Unsupported field: " + field.getName());
368 }
369 return field.rangeRefinedBy(this);
370 }
371
372 private ValueRange actualRange(int calendarField) {
373 Calendar jcal = Calendar.getInstance(JapaneseChronology.LOCALE);
374 jcal.set(Calendar.ERA, era.getValue() + JapaneseEra.ERA_OFFSET); // TODO: cannot calculate this way for SEIREKI
375 jcal.set(yearOfEra, isoDate.getMonthValue() - 1, isoDate.getDayOfMonth());
376 return ValueRange.of(jcal.getActualMinimum(calendarField),
377 jcal.getActualMaximum(calendarField));
378 }
379
380 @Override
381 public long getLong(TemporalField field) {
382 if (field instanceof ChronoField) {
383 // same as ISO:
384 // DAY_OF_WEEK, ALIGNED_DAY_OF_WEEK_IN_MONTH, DAY_OF_MONTH, EPOCH_DAY,
385 // ALIGNED_WEEK_OF_MONTH, MONTH_OF_YEAR, PROLEPTIC_MONTH, YEAR
386 //
387 // calendar specific fields
388 // ALIGNED_DAY_OF_WEEK_IN_YEAR, DAY_OF_YEAR, ALIGNED_WEEK_OF_YEAR, YEAR_OF_ERA, ERA
389 switch ((ChronoField) field) {
390 case YEAR_OF_ERA:
391 return yearOfEra;
392 case ERA:
393 return era.getValue();
394 case DAY_OF_YEAR: {
395 LocalGregorianCalendar.Date jdate = toPrivateJapaneseDate(isoDate);
396 return JapaneseChronology.JCAL.getDayOfYear(jdate);
397 }
398 // TODO: ALIGNED_DAY_OF_WEEK_IN_YEAR and ALIGNED_WEEK_OF_YEAR ???
399 }
400 return isoDate.getLong(field);
401 }
402 return field.getFrom(this);
403 }
404
405 /**
406 * Returns a {@code LocalGregorianCalendar.Date} converted from the given {@code isoDate}.
407 *
408 * @param isoDate the local date, not null
409 * @return a {@code LocalGregorianCalendar.Date}, not null
410 */
411 private static LocalGregorianCalendar.Date toPrivateJapaneseDate(LocalDate isoDate) {
412 LocalGregorianCalendar.Date jdate = JapaneseChronology.JCAL.newCalendarDate(null);
413 sun.util.calendar.Era sunEra = JapaneseEra.privateEraFrom(isoDate);
414 int year = isoDate.getYear();
415 if (sunEra != null) {
416 year -= sunEra.getSinceDate().getYear() - 1;
417 }
418 jdate.setEra(sunEra).setYear(year).setMonth(isoDate.getMonthValue()).setDayOfMonth(isoDate.getDayOfMonth());
419 JapaneseChronology.JCAL.normalize(jdate);
420 return jdate;
421 }
422
423 //-----------------------------------------------------------------------
424 @Override
425 public JapaneseDate with(TemporalField field, long newValue) {
426 if (field instanceof ChronoField) {
427 ChronoField f = (ChronoField) field;
428 if (getLong(f) == newValue) {
429 return this;
430 }
431 switch (f) {
432 case YEAR_OF_ERA:
433 case YEAR:
434 case ERA: {
435 int nvalue = getChronology().range(f).checkValidIntValue(newValue, f);
436 switch (f) {
437 case YEAR_OF_ERA:
438 return this.withYear(nvalue);
439 case YEAR:
440 return with(isoDate.withYear(nvalue));
441 case ERA: {
442 return this.withYear(JapaneseEra.of(nvalue), yearOfEra);
443 }
444 }
445 }
446 }
447 // YEAR, PROLEPTIC_MONTH and others are same as ISO
448 // TODO: review other fields, such as WEEK_OF_YEAR
449 return with(isoDate.with(field, newValue));
450 }
451 return ChronoLocalDate.super.with(field, newValue);
452 }
453
454 /**
455 * {@inheritDoc}
456 * @throws DateTimeException {@inheritDoc}
457 * @throws ArithmeticException {@inheritDoc}
458 */
459 @Override
460 public JapaneseDate with(TemporalAdjuster adjuster) {
461 return super.with(adjuster);
462 }
463
464 /**
465 * {@inheritDoc}
466 * @throws DateTimeException {@inheritDoc}
467 * @throws ArithmeticException {@inheritDoc}
468 */
469 @Override
470 public JapaneseDate plus(TemporalAmount amount) {
471 return super.plus(amount);
472 }
473
474 /**
475 * {@inheritDoc}
476 * @throws DateTimeException {@inheritDoc}
477 * @throws ArithmeticException {@inheritDoc}
478 */
479 @Override
480 public JapaneseDate minus(TemporalAmount amount) {
481 return super.minus(amount);
482 }
483 //-----------------------------------------------------------------------
484 /**
485 * Returns a copy of this date with the year altered.
486 * <p>
487 * This method changes the year of the date.
488 * If the month-day is invalid for the year, then the previous valid day
489 * will be selected instead.
490 * <p>
491 * This instance is immutable and unaffected by this method call.
492 *
493 * @param era the era to set in the result, not null
494 * @param yearOfEra the year-of-era to set in the returned date
495 * @return a {@code JapaneseDate} based on this date with the requested year, never null
496 * @throws DateTimeException if {@code year} is invalid
497 */
498 private JapaneseDate withYear(JapaneseEra era, int yearOfEra) {
499 int year = JapaneseChronology.INSTANCE.prolepticYear(era, yearOfEra);
500 return with(isoDate.withYear(year));
501 }
502
503 /**
504 * Returns a copy of this date with the year-of-era altered.
505 * <p>
506 * This method changes the year-of-era of the date.
507 * If the month-day is invalid for the year, then the previous valid day
508 * will be selected instead.
509 * <p>
510 * This instance is immutable and unaffected by this method call.
511 *
512 * @param year the year to set in the returned date
513 * @return a {@code JapaneseDate} based on this date with the requested year-of-era, never null
514 * @throws DateTimeException if {@code year} is invalid
515 */
516 private JapaneseDate withYear(int year) {
517 return withYear(getEra(), year);
518 }
519
520 //-----------------------------------------------------------------------
521 @Override
522 JapaneseDate plusYears(long years) {
523 return with(isoDate.plusYears(years));
524 }
525
526 @Override
527 JapaneseDate plusMonths(long months) {
528 return with(isoDate.plusMonths(months));
529 }
530
531 @Override
532 JapaneseDate plusWeeks(long weeksToAdd) {
533 return with(isoDate.plusWeeks(weeksToAdd));
534 }
535
536 @Override
537 JapaneseDate plusDays(long days) {
538 return with(isoDate.plusDays(days));
539 }
540
541 @Override
542 public JapaneseDate plus(long amountToAdd, TemporalUnit unit) {
543 return super.plus(amountToAdd, unit);
544 }
545
546 @Override
547 public JapaneseDate minus(long amountToAdd, TemporalUnit unit) {
548 return super.minus(amountToAdd, unit);
549 }
550
551 @Override
552 JapaneseDate minusYears(long yearsToSubtract) {
553 return super.minusYears(yearsToSubtract);
554 }
555
556 @Override
557 JapaneseDate minusMonths(long monthsToSubtract) {
558 return super.minusMonths(monthsToSubtract);
559 }
560
561 @Override
562 JapaneseDate minusWeeks(long weeksToSubtract) {
563 return super.minusWeeks(weeksToSubtract);
564 }
565
566 @Override
567 JapaneseDate minusDays(long daysToSubtract) {
568 return super.minusDays(daysToSubtract);
569 }
570
571 private JapaneseDate with(LocalDate newDate) {
572 return (newDate.equals(isoDate) ? this : new JapaneseDate(newDate));
573 }
574
575 @Override // for javadoc and covariant return type
576 public final ChronoLocalDateTime<JapaneseDate> atTime(LocalTime localTime) {
577 return super.atTime(localTime);
578 }
579
580 @Override
581 public Period periodUntil(ChronoLocalDate<?> endDate) {
582 return isoDate.periodUntil(endDate);
583 }
584
585 @Override // override for performance
586 public long toEpochDay() {
587 return isoDate.toEpochDay();
588 }
589
590 //-------------------------------------------------------------------------
591 @Override // override for performance
592 public boolean equals(Object obj) {
593 if (this == obj) {
594 return true;
595 }
596 if (obj instanceof JapaneseDate) {
597 JapaneseDate otherDate = (JapaneseDate) obj;
598 return this.isoDate.equals(otherDate.isoDate);
599 }
600 return false;
601 }
602
603 @Override // override for performance
604 public int hashCode() {
605 return getChronology().getId().hashCode() ^ isoDate.hashCode();
606 }
607
608 @Override
609 public String toString() {
610 if (era == JapaneseEra.SEIREKI) {
611 return getChronology().getId() + " " + isoDate.toString();
612 }
613 return super.toString();
614 }
615
616 //-----------------------------------------------------------------------
617 private Object writeReplace() {
618 return new Ser(Ser.JAPANESE_DATE_TYPE, this);
619 }
620
621 void writeExternal(DataOutput out) throws IOException {
622 // JapaneseChronology is implicit in the JAPANESE_DATE_TYPE
623 out.writeInt(get(YEAR));
624 out.writeByte(get(MONTH_OF_YEAR));
625 out.writeByte(get(DAY_OF_MONTH));
626 }
627
628 static JapaneseDate readExternal(DataInput in) throws IOException {
629 int year = in.readInt();
630 int month = in.readByte();
631 int dayOfMonth = in.readByte();
632 return JapaneseChronology.INSTANCE.date(year, month, dayOfMonth);
633 }
634
635 }