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) 2007-2012, 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.temporal; |
|
63 |
|
64 import static java.time.temporal.ChronoField.EPOCH_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.YEAR; |
|
68 import static java.time.temporal.ChronoField.YEAR_OF_ERA; |
|
69 import static java.time.temporal.ChronoUnit.MONTHS; |
|
70 |
|
71 import java.io.DataInput; |
|
72 import java.io.DataOutput; |
|
73 import java.io.IOException; |
|
74 import java.io.InvalidObjectException; |
|
75 import java.io.ObjectStreamException; |
|
76 import java.io.Serializable; |
|
77 import java.time.Clock; |
|
78 import java.time.DateTimeException; |
|
79 import java.time.LocalDate; |
|
80 import java.time.Month; |
|
81 import java.time.ZoneId; |
|
82 import java.time.format.DateTimeFormatter; |
|
83 import java.time.format.DateTimeFormatterBuilder; |
|
84 import java.time.format.DateTimeParseException; |
|
85 import java.time.format.SignStyle; |
|
86 import java.util.Objects; |
|
87 |
|
88 /** |
|
89 * A year-month in the ISO-8601 calendar system, such as {@code 2007-12}. |
|
90 * <p> |
|
91 * {@code YearMonth} is an immutable date-time object that represents the combination |
|
92 * of a year and month. Any field that can be derived from a year and month, such as |
|
93 * quarter-of-year, can be obtained. |
|
94 * <p> |
|
95 * This class does not store or represent a day, time or time-zone. |
|
96 * For example, the value "October 2007" can be stored in a {@code YearMonth}. |
|
97 * <p> |
|
98 * The ISO-8601 calendar system is the modern civil calendar system used today |
|
99 * in most of the world. It is equivalent to the proleptic Gregorian calendar |
|
100 * system, in which today's rules for leap years are applied for all time. |
|
101 * For most applications written today, the ISO-8601 rules are entirely suitable. |
|
102 * However, any application that makes use of historical dates, and requires them |
|
103 * to be accurate will find the ISO-8601 approach unsuitable. |
|
104 * |
|
105 * <h3>Specification for implementors</h3> |
|
106 * This class is immutable and thread-safe. |
|
107 * |
|
108 * @since 1.8 |
|
109 */ |
|
110 public final class YearMonth |
|
111 implements Temporal, TemporalAdjuster, Comparable<YearMonth>, Serializable { |
|
112 |
|
113 /** |
|
114 * Serialization version. |
|
115 */ |
|
116 private static final long serialVersionUID = 4183400860270640070L; |
|
117 /** |
|
118 * Parser. |
|
119 */ |
|
120 private static final DateTimeFormatter PARSER = new DateTimeFormatterBuilder() |
|
121 .appendValue(YEAR, 4, 10, SignStyle.EXCEEDS_PAD) |
|
122 .appendLiteral('-') |
|
123 .appendValue(MONTH_OF_YEAR, 2) |
|
124 .toFormatter(); |
|
125 |
|
126 /** |
|
127 * The year. |
|
128 */ |
|
129 private final int year; |
|
130 /** |
|
131 * The month-of-year, not null. |
|
132 */ |
|
133 private final int month; |
|
134 |
|
135 //----------------------------------------------------------------------- |
|
136 /** |
|
137 * Obtains the current year-month from the system clock in the default time-zone. |
|
138 * <p> |
|
139 * This will query the {@link java.time.Clock#systemDefaultZone() system clock} in the default |
|
140 * time-zone to obtain the current year-month. |
|
141 * The zone and offset will be set based on the time-zone in the clock. |
|
142 * <p> |
|
143 * Using this method will prevent the ability to use an alternate clock for testing |
|
144 * because the clock is hard-coded. |
|
145 * |
|
146 * @return the current year-month using the system clock and default time-zone, not null |
|
147 */ |
|
148 public static YearMonth now() { |
|
149 return now(Clock.systemDefaultZone()); |
|
150 } |
|
151 |
|
152 /** |
|
153 * Obtains the current year-month from the system clock in the specified time-zone. |
|
154 * <p> |
|
155 * This will query the {@link Clock#system(java.time.ZoneId) system clock} to obtain the current year-month. |
|
156 * Specifying the time-zone avoids dependence on the default time-zone. |
|
157 * <p> |
|
158 * Using this method will prevent the ability to use an alternate clock for testing |
|
159 * because the clock is hard-coded. |
|
160 * |
|
161 * @param zone the zone ID to use, not null |
|
162 * @return the current year-month using the system clock, not null |
|
163 */ |
|
164 public static YearMonth now(ZoneId zone) { |
|
165 return now(Clock.system(zone)); |
|
166 } |
|
167 |
|
168 /** |
|
169 * Obtains the current year-month from the specified clock. |
|
170 * <p> |
|
171 * This will query the specified clock to obtain the current year-month. |
|
172 * Using this method allows the use of an alternate clock for testing. |
|
173 * The alternate clock may be introduced using {@link Clock dependency injection}. |
|
174 * |
|
175 * @param clock the clock to use, not null |
|
176 * @return the current year-month, not null |
|
177 */ |
|
178 public static YearMonth now(Clock clock) { |
|
179 final LocalDate now = LocalDate.now(clock); // called once |
|
180 return YearMonth.of(now.getYear(), now.getMonth()); |
|
181 } |
|
182 |
|
183 //----------------------------------------------------------------------- |
|
184 /** |
|
185 * Obtains an instance of {@code YearMonth} from a year and month. |
|
186 * |
|
187 * @param year the year to represent, from MIN_YEAR to MAX_YEAR |
|
188 * @param month the month-of-year to represent, not null |
|
189 * @return the year-month, not null |
|
190 * @throws DateTimeException if the year value is invalid |
|
191 */ |
|
192 public static YearMonth of(int year, Month month) { |
|
193 Objects.requireNonNull(month, "month"); |
|
194 return of(year, month.getValue()); |
|
195 } |
|
196 |
|
197 /** |
|
198 * Obtains an instance of {@code YearMonth} from a year and month. |
|
199 * |
|
200 * @param year the year to represent, from MIN_YEAR to MAX_YEAR |
|
201 * @param month the month-of-year to represent, from 1 (January) to 12 (December) |
|
202 * @return the year-month, not null |
|
203 * @throws DateTimeException if either field value is invalid |
|
204 */ |
|
205 public static YearMonth of(int year, int month) { |
|
206 YEAR.checkValidValue(year); |
|
207 MONTH_OF_YEAR.checkValidValue(month); |
|
208 return new YearMonth(year, month); |
|
209 } |
|
210 |
|
211 //----------------------------------------------------------------------- |
|
212 /** |
|
213 * Obtains an instance of {@code YearMonth} from a temporal object. |
|
214 * <p> |
|
215 * A {@code TemporalAccessor} represents some form of date and time information. |
|
216 * This factory converts the arbitrary temporal object to an instance of {@code YearMonth}. |
|
217 * <p> |
|
218 * The conversion extracts the {@link ChronoField#YEAR YEAR} and |
|
219 * {@link ChronoField#MONTH_OF_YEAR MONTH_OF_YEAR} fields. |
|
220 * The extraction is only permitted if the temporal object has an ISO |
|
221 * chronology, or can be converted to a {@code LocalDate}. |
|
222 * <p> |
|
223 * This method matches the signature of the functional interface {@link TemporalQuery} |
|
224 * allowing it to be used in queries via method reference, {@code YearMonth::from}. |
|
225 * |
|
226 * @param temporal the temporal object to convert, not null |
|
227 * @return the year-month, not null |
|
228 * @throws DateTimeException if unable to convert to a {@code YearMonth} |
|
229 */ |
|
230 public static YearMonth from(TemporalAccessor temporal) { |
|
231 if (temporal instanceof YearMonth) { |
|
232 return (YearMonth) temporal; |
|
233 } |
|
234 try { |
|
235 if (ISOChrono.INSTANCE.equals(Chrono.from(temporal)) == false) { |
|
236 temporal = LocalDate.from(temporal); |
|
237 } |
|
238 return of(temporal.get(YEAR), temporal.get(MONTH_OF_YEAR)); |
|
239 } catch (DateTimeException ex) { |
|
240 throw new DateTimeException("Unable to obtain YearMonth from TemporalAccessor: " + temporal.getClass(), ex); |
|
241 } |
|
242 } |
|
243 |
|
244 //----------------------------------------------------------------------- |
|
245 /** |
|
246 * Obtains an instance of {@code YearMonth} from a text string such as {@code 2007-12}. |
|
247 * <p> |
|
248 * The string must represent a valid year-month. |
|
249 * The format must be {@code yyyy-MM}. |
|
250 * Years outside the range 0000 to 9999 must be prefixed by the plus or minus symbol. |
|
251 * |
|
252 * @param text the text to parse such as "2007-12", not null |
|
253 * @return the parsed year-month, not null |
|
254 * @throws DateTimeParseException if the text cannot be parsed |
|
255 */ |
|
256 public static YearMonth parse(CharSequence text) { |
|
257 return parse(text, PARSER); |
|
258 } |
|
259 |
|
260 /** |
|
261 * Obtains an instance of {@code YearMonth} from a text string using a specific formatter. |
|
262 * <p> |
|
263 * The text is parsed using the formatter, returning a year-month. |
|
264 * |
|
265 * @param text the text to parse, not null |
|
266 * @param formatter the formatter to use, not null |
|
267 * @return the parsed year-month, not null |
|
268 * @throws DateTimeParseException if the text cannot be parsed |
|
269 */ |
|
270 public static YearMonth parse(CharSequence text, DateTimeFormatter formatter) { |
|
271 Objects.requireNonNull(formatter, "formatter"); |
|
272 return formatter.parse(text, YearMonth::from); |
|
273 } |
|
274 |
|
275 //----------------------------------------------------------------------- |
|
276 /** |
|
277 * Constructor. |
|
278 * |
|
279 * @param year the year to represent, validated from MIN_YEAR to MAX_YEAR |
|
280 * @param month the month-of-year to represent, validated from 1 (January) to 12 (December) |
|
281 */ |
|
282 private YearMonth(int year, int month) { |
|
283 this.year = year; |
|
284 this.month = month; |
|
285 } |
|
286 |
|
287 /** |
|
288 * Returns a copy of this year-month with the new year and month, checking |
|
289 * to see if a new object is in fact required. |
|
290 * |
|
291 * @param newYear the year to represent, validated from MIN_YEAR to MAX_YEAR |
|
292 * @param newMonth the month-of-year to represent, validated not null |
|
293 * @return the year-month, not null |
|
294 */ |
|
295 private YearMonth with(int newYear, int newMonth) { |
|
296 if (year == newYear && month == newMonth) { |
|
297 return this; |
|
298 } |
|
299 return new YearMonth(newYear, newMonth); |
|
300 } |
|
301 |
|
302 //----------------------------------------------------------------------- |
|
303 /** |
|
304 * Checks if the specified field is supported. |
|
305 * <p> |
|
306 * This checks if this year-month can be queried for the specified field. |
|
307 * If false, then calling the {@link #range(TemporalField) range} and |
|
308 * {@link #get(TemporalField) get} methods will throw an exception. |
|
309 * <p> |
|
310 * If the field is a {@link ChronoField} then the query is implemented here. |
|
311 * The {@link #isSupported(TemporalField) supported fields} will return valid |
|
312 * values based on this date-time. |
|
313 * The supported fields are: |
|
314 * <ul> |
|
315 * <li>{@code MONTH_OF_YEAR} |
|
316 * <li>{@code EPOCH_MONTH} |
|
317 * <li>{@code YEAR_OF_ERA} |
|
318 * <li>{@code YEAR} |
|
319 * <li>{@code ERA} |
|
320 * </ul> |
|
321 * All other {@code ChronoField} instances will return false. |
|
322 * <p> |
|
323 * If the field is not a {@code ChronoField}, then the result of this method |
|
324 * is obtained by invoking {@code TemporalField.doIsSupported(TemporalAccessor)} |
|
325 * passing {@code this} as the argument. |
|
326 * Whether the field is supported is determined by the field. |
|
327 * |
|
328 * @param field the field to check, null returns false |
|
329 * @return true if the field is supported on this year-month, false if not |
|
330 */ |
|
331 @Override |
|
332 public boolean isSupported(TemporalField field) { |
|
333 if (field instanceof ChronoField) { |
|
334 return field == YEAR || field == MONTH_OF_YEAR || |
|
335 field == EPOCH_MONTH || field == YEAR_OF_ERA || field == ERA; |
|
336 } |
|
337 return field != null && field.doIsSupported(this); |
|
338 } |
|
339 |
|
340 /** |
|
341 * Gets the range of valid values for the specified field. |
|
342 * <p> |
|
343 * The range object expresses the minimum and maximum valid values for a field. |
|
344 * This year-month is used to enhance the accuracy of the returned range. |
|
345 * If it is not possible to return the range, because the field is not supported |
|
346 * or for some other reason, an exception is thrown. |
|
347 * <p> |
|
348 * If the field is a {@link ChronoField} then the query is implemented here. |
|
349 * The {@link #isSupported(TemporalField) supported fields} will return |
|
350 * appropriate range instances. |
|
351 * All other {@code ChronoField} instances will throw a {@code DateTimeException}. |
|
352 * <p> |
|
353 * If the field is not a {@code ChronoField}, then the result of this method |
|
354 * is obtained by invoking {@code TemporalField.doRange(TemporalAccessor)} |
|
355 * passing {@code this} as the argument. |
|
356 * Whether the range can be obtained is determined by the field. |
|
357 * |
|
358 * @param field the field to query the range for, not null |
|
359 * @return the range of valid values for the field, not null |
|
360 * @throws DateTimeException if the range for the field cannot be obtained |
|
361 */ |
|
362 @Override |
|
363 public ValueRange range(TemporalField field) { |
|
364 if (field == YEAR_OF_ERA) { |
|
365 return (getYear() <= 0 ? ValueRange.of(1, Year.MAX_VALUE + 1) : ValueRange.of(1, Year.MAX_VALUE)); |
|
366 } |
|
367 return Temporal.super.range(field); |
|
368 } |
|
369 |
|
370 /** |
|
371 * Gets the value of the specified field from this year-month as an {@code int}. |
|
372 * <p> |
|
373 * This queries this year-month for the value for the specified field. |
|
374 * The returned value will always be within the valid range of values for the field. |
|
375 * If it is not possible to return the value, because the field is not supported |
|
376 * or for some other reason, an exception is thrown. |
|
377 * <p> |
|
378 * If the field is a {@link ChronoField} then the query is implemented here. |
|
379 * The {@link #isSupported(TemporalField) supported fields} will return valid |
|
380 * values based on this year-month, except {@code EPOCH_MONTH} which is too |
|
381 * large to fit in an {@code int} and throw a {@code DateTimeException}. |
|
382 * All other {@code ChronoField} instances will throw a {@code DateTimeException}. |
|
383 * <p> |
|
384 * If the field is not a {@code ChronoField}, then the result of this method |
|
385 * is obtained by invoking {@code TemporalField.doGet(TemporalAccessor)} |
|
386 * passing {@code this} as the argument. Whether the value can be obtained, |
|
387 * and what the value represents, is determined by the field. |
|
388 * |
|
389 * @param field the field to get, not null |
|
390 * @return the value for the field |
|
391 * @throws DateTimeException if a value for the field cannot be obtained |
|
392 * @throws ArithmeticException if numeric overflow occurs |
|
393 */ |
|
394 @Override // override for Javadoc |
|
395 public int get(TemporalField field) { |
|
396 return range(field).checkValidIntValue(getLong(field), field); |
|
397 } |
|
398 |
|
399 /** |
|
400 * Gets the value of the specified field from this year-month as a {@code long}. |
|
401 * <p> |
|
402 * This queries this year-month for the value for the specified field. |
|
403 * If it is not possible to return the value, because the field is not supported |
|
404 * or for some other reason, an exception is thrown. |
|
405 * <p> |
|
406 * If the field is a {@link ChronoField} then the query is implemented here. |
|
407 * The {@link #isSupported(TemporalField) supported fields} will return valid |
|
408 * values based on this year-month. |
|
409 * All other {@code ChronoField} instances will throw a {@code DateTimeException}. |
|
410 * <p> |
|
411 * If the field is not a {@code ChronoField}, then the result of this method |
|
412 * is obtained by invoking {@code TemporalField.doGet(TemporalAccessor)} |
|
413 * passing {@code this} as the argument. Whether the value can be obtained, |
|
414 * and what the value represents, is determined by the field. |
|
415 * |
|
416 * @param field the field to get, not null |
|
417 * @return the value for the field |
|
418 * @throws DateTimeException if a value for the field cannot be obtained |
|
419 * @throws ArithmeticException if numeric overflow occurs |
|
420 */ |
|
421 @Override |
|
422 public long getLong(TemporalField field) { |
|
423 if (field instanceof ChronoField) { |
|
424 switch ((ChronoField) field) { |
|
425 case MONTH_OF_YEAR: return month; |
|
426 case EPOCH_MONTH: return getEpochMonth(); |
|
427 case YEAR_OF_ERA: return (year < 1 ? 1 - year : year); |
|
428 case YEAR: return year; |
|
429 case ERA: return (year < 1 ? 0 : 1); |
|
430 } |
|
431 throw new DateTimeException("Unsupported field: " + field.getName()); |
|
432 } |
|
433 return field.doGet(this); |
|
434 } |
|
435 |
|
436 private long getEpochMonth() { |
|
437 return ((year - 1970) * 12L) + (month - 1); |
|
438 } |
|
439 |
|
440 //----------------------------------------------------------------------- |
|
441 /** |
|
442 * Gets the year field. |
|
443 * <p> |
|
444 * This method returns the primitive {@code int} value for the year. |
|
445 * <p> |
|
446 * The year returned by this method is proleptic as per {@code get(YEAR)}. |
|
447 * |
|
448 * @return the year, from MIN_YEAR to MAX_YEAR |
|
449 */ |
|
450 public int getYear() { |
|
451 return year; |
|
452 } |
|
453 |
|
454 /** |
|
455 * Gets the month-of-year field using the {@code Month} enum. |
|
456 * <p> |
|
457 * This method returns the enum {@link Month} for the month. |
|
458 * This avoids confusion as to what {@code int} values mean. |
|
459 * If you need access to the primitive {@code int} value then the enum |
|
460 * provides the {@link Month#getValue() int value}. |
|
461 * |
|
462 * @return the month-of-year, not null |
|
463 */ |
|
464 public Month getMonth() { |
|
465 return Month.of(month); |
|
466 } |
|
467 |
|
468 //----------------------------------------------------------------------- |
|
469 /** |
|
470 * Checks if the year is a leap year, according to the ISO proleptic |
|
471 * calendar system rules. |
|
472 * <p> |
|
473 * This method applies the current rules for leap years across the whole time-line. |
|
474 * In general, a year is a leap year if it is divisible by four without |
|
475 * remainder. However, years divisible by 100, are not leap years, with |
|
476 * the exception of years divisible by 400 which are. |
|
477 * <p> |
|
478 * For example, 1904 is a leap year it is divisible by 4. |
|
479 * 1900 was not a leap year as it is divisible by 100, however 2000 was a |
|
480 * leap year as it is divisible by 400. |
|
481 * <p> |
|
482 * The calculation is proleptic - applying the same rules into the far future and far past. |
|
483 * This is historically inaccurate, but is correct for the ISO-8601 standard. |
|
484 * |
|
485 * @return true if the year is leap, false otherwise |
|
486 */ |
|
487 public boolean isLeapYear() { |
|
488 return ISOChrono.INSTANCE.isLeapYear(year); |
|
489 } |
|
490 |
|
491 /** |
|
492 * Checks if the day-of-month is valid for this year-month. |
|
493 * <p> |
|
494 * This method checks whether this year and month and the input day form |
|
495 * a valid date. |
|
496 * |
|
497 * @param dayOfMonth the day-of-month to validate, from 1 to 31, invalid value returns false |
|
498 * @return true if the day is valid for this year-month |
|
499 */ |
|
500 public boolean isValidDay(int dayOfMonth) { |
|
501 return dayOfMonth >= 1 && dayOfMonth <= lengthOfMonth(); |
|
502 } |
|
503 |
|
504 /** |
|
505 * Returns the length of the month, taking account of the year. |
|
506 * <p> |
|
507 * This returns the length of the month in days. |
|
508 * For example, a date in January would return 31. |
|
509 * |
|
510 * @return the length of the month in days, from 28 to 31 |
|
511 */ |
|
512 public int lengthOfMonth() { |
|
513 return getMonth().length(isLeapYear()); |
|
514 } |
|
515 |
|
516 /** |
|
517 * Returns the length of the year. |
|
518 * <p> |
|
519 * This returns the length of the year in days, either 365 or 366. |
|
520 * |
|
521 * @return 366 if the year is leap, 365 otherwise |
|
522 */ |
|
523 public int lengthOfYear() { |
|
524 return (isLeapYear() ? 366 : 365); |
|
525 } |
|
526 |
|
527 //----------------------------------------------------------------------- |
|
528 /** |
|
529 * Returns an adjusted copy of this year-month. |
|
530 * <p> |
|
531 * This returns a new {@code YearMonth}, based on this one, with the year-month adjusted. |
|
532 * The adjustment takes place using the specified adjuster strategy object. |
|
533 * Read the documentation of the adjuster to understand what adjustment will be made. |
|
534 * <p> |
|
535 * A simple adjuster might simply set the one of the fields, such as the year field. |
|
536 * A more complex adjuster might set the year-month to the next month that |
|
537 * Halley's comet will pass the Earth. |
|
538 * <p> |
|
539 * The result of this method is obtained by invoking the |
|
540 * {@link TemporalAdjuster#adjustInto(Temporal)} method on the |
|
541 * specified adjuster passing {@code this} as the argument. |
|
542 * <p> |
|
543 * This instance is immutable and unaffected by this method call. |
|
544 * |
|
545 * @param adjuster the adjuster to use, not null |
|
546 * @return a {@code YearMonth} based on {@code this} with the adjustment made, not null |
|
547 * @throws DateTimeException if the adjustment cannot be made |
|
548 * @throws ArithmeticException if numeric overflow occurs |
|
549 */ |
|
550 @Override |
|
551 public YearMonth with(TemporalAdjuster adjuster) { |
|
552 return (YearMonth) adjuster.adjustInto(this); |
|
553 } |
|
554 |
|
555 /** |
|
556 * Returns a copy of this year-month with the specified field set to a new value. |
|
557 * <p> |
|
558 * This returns a new {@code YearMonth}, based on this one, with the value |
|
559 * for the specified field changed. |
|
560 * This can be used to change any supported field, such as the year or month. |
|
561 * If it is not possible to set the value, because the field is not supported or for |
|
562 * some other reason, an exception is thrown. |
|
563 * <p> |
|
564 * If the field is a {@link ChronoField} then the adjustment is implemented here. |
|
565 * The supported fields behave as follows: |
|
566 * <ul> |
|
567 * <li>{@code MONTH_OF_YEAR} - |
|
568 * Returns a {@code YearMonth} with the specified month-of-year. |
|
569 * The year will be unchanged. |
|
570 * <li>{@code EPOCH_MONTH} - |
|
571 * Returns a {@code YearMonth} with the specified epoch-month. |
|
572 * This completely replaces the year and month of this object. |
|
573 * <li>{@code YEAR_OF_ERA} - |
|
574 * Returns a {@code YearMonth} with the specified year-of-era |
|
575 * The month and era will be unchanged. |
|
576 * <li>{@code YEAR} - |
|
577 * Returns a {@code YearMonth} with the specified year. |
|
578 * The month will be unchanged. |
|
579 * <li>{@code ERA} - |
|
580 * Returns a {@code YearMonth} with the specified era. |
|
581 * The month and year-of-era will be unchanged. |
|
582 * </ul> |
|
583 * <p> |
|
584 * In all cases, if the new value is outside the valid range of values for the field |
|
585 * then a {@code DateTimeException} will be thrown. |
|
586 * <p> |
|
587 * All other {@code ChronoField} instances will throw a {@code DateTimeException}. |
|
588 * <p> |
|
589 * If the field is not a {@code ChronoField}, then the result of this method |
|
590 * is obtained by invoking {@code TemporalField.doWith(Temporal, long)} |
|
591 * passing {@code this} as the argument. In this case, the field determines |
|
592 * whether and how to adjust the instant. |
|
593 * <p> |
|
594 * This instance is immutable and unaffected by this method call. |
|
595 * |
|
596 * @param field the field to set in the result, not null |
|
597 * @param newValue the new value of the field in the result |
|
598 * @return a {@code YearMonth} based on {@code this} with the specified field set, not null |
|
599 * @throws DateTimeException if the field cannot be set |
|
600 * @throws ArithmeticException if numeric overflow occurs |
|
601 */ |
|
602 @Override |
|
603 public YearMonth with(TemporalField field, long newValue) { |
|
604 if (field instanceof ChronoField) { |
|
605 ChronoField f = (ChronoField) field; |
|
606 f.checkValidValue(newValue); |
|
607 switch (f) { |
|
608 case MONTH_OF_YEAR: return withMonth((int) newValue); |
|
609 case EPOCH_MONTH: return plusMonths(newValue - getLong(EPOCH_MONTH)); |
|
610 case YEAR_OF_ERA: return withYear((int) (year < 1 ? 1 - newValue : newValue)); |
|
611 case YEAR: return withYear((int) newValue); |
|
612 case ERA: return (getLong(ERA) == newValue ? this : withYear(1 - year)); |
|
613 } |
|
614 throw new DateTimeException("Unsupported field: " + field.getName()); |
|
615 } |
|
616 return field.doWith(this, newValue); |
|
617 } |
|
618 |
|
619 //----------------------------------------------------------------------- |
|
620 /** |
|
621 * Returns a copy of this {@code YearMonth} with the year altered. |
|
622 * <p> |
|
623 * This instance is immutable and unaffected by this method call. |
|
624 * |
|
625 * @param year the year to set in the returned year-month, from MIN_YEAR to MAX_YEAR |
|
626 * @return a {@code YearMonth} based on this year-month with the requested year, not null |
|
627 * @throws DateTimeException if the year value is invalid |
|
628 */ |
|
629 public YearMonth withYear(int year) { |
|
630 YEAR.checkValidValue(year); |
|
631 return with(year, month); |
|
632 } |
|
633 |
|
634 /** |
|
635 * Returns a copy of this {@code YearMonth} with the month-of-year altered. |
|
636 * <p> |
|
637 * This instance is immutable and unaffected by this method call. |
|
638 * |
|
639 * @param month the month-of-year to set in the returned year-month, from 1 (January) to 12 (December) |
|
640 * @return a {@code YearMonth} based on this year-month with the requested month, not null |
|
641 * @throws DateTimeException if the month-of-year value is invalid |
|
642 */ |
|
643 public YearMonth withMonth(int month) { |
|
644 MONTH_OF_YEAR.checkValidValue(month); |
|
645 return with(year, month); |
|
646 } |
|
647 |
|
648 //----------------------------------------------------------------------- |
|
649 /** |
|
650 * Returns a copy of this year-month with the specified period added. |
|
651 * <p> |
|
652 * This method returns a new year-month based on this year-month with the specified period added. |
|
653 * The adder is typically {@link java.time.Period} but may be any other type implementing |
|
654 * the {@link TemporalAdder} interface. |
|
655 * The calculation is delegated to the specified adjuster, which typically calls |
|
656 * back to {@link #plus(long, TemporalUnit)}. |
|
657 * <p> |
|
658 * This instance is immutable and unaffected by this method call. |
|
659 * |
|
660 * @param adder the adder to use, not null |
|
661 * @return a {@code YearMonth} based on this year-month with the addition made, not null |
|
662 * @throws DateTimeException if the addition cannot be made |
|
663 * @throws ArithmeticException if numeric overflow occurs |
|
664 */ |
|
665 @Override |
|
666 public YearMonth plus(TemporalAdder adder) { |
|
667 return (YearMonth) adder.addTo(this); |
|
668 } |
|
669 |
|
670 /** |
|
671 * {@inheritDoc} |
|
672 * @throws DateTimeException {@inheritDoc} |
|
673 * @throws ArithmeticException {@inheritDoc} |
|
674 */ |
|
675 @Override |
|
676 public YearMonth plus(long amountToAdd, TemporalUnit unit) { |
|
677 if (unit instanceof ChronoUnit) { |
|
678 switch ((ChronoUnit) unit) { |
|
679 case MONTHS: return plusMonths(amountToAdd); |
|
680 case YEARS: return plusYears(amountToAdd); |
|
681 case DECADES: return plusYears(Math.multiplyExact(amountToAdd, 10)); |
|
682 case CENTURIES: return plusYears(Math.multiplyExact(amountToAdd, 100)); |
|
683 case MILLENNIA: return plusYears(Math.multiplyExact(amountToAdd, 1000)); |
|
684 case ERAS: return with(ERA, Math.addExact(getLong(ERA), amountToAdd)); |
|
685 } |
|
686 throw new DateTimeException("Unsupported unit: " + unit.getName()); |
|
687 } |
|
688 return unit.doPlus(this, amountToAdd); |
|
689 } |
|
690 |
|
691 /** |
|
692 * Returns a copy of this year-month with the specified period in years added. |
|
693 * <p> |
|
694 * This instance is immutable and unaffected by this method call. |
|
695 * |
|
696 * @param yearsToAdd the years to add, may be negative |
|
697 * @return a {@code YearMonth} based on this year-month with the years added, not null |
|
698 * @throws DateTimeException if the result exceeds the supported range |
|
699 */ |
|
700 public YearMonth plusYears(long yearsToAdd) { |
|
701 if (yearsToAdd == 0) { |
|
702 return this; |
|
703 } |
|
704 int newYear = YEAR.checkValidIntValue(year + yearsToAdd); // safe overflow |
|
705 return with(newYear, month); |
|
706 } |
|
707 |
|
708 /** |
|
709 * Returns a copy of this year-month with the specified period in months added. |
|
710 * <p> |
|
711 * This instance is immutable and unaffected by this method call. |
|
712 * |
|
713 * @param monthsToAdd the months to add, may be negative |
|
714 * @return a {@code YearMonth} based on this year-month with the months added, not null |
|
715 * @throws DateTimeException if the result exceeds the supported range |
|
716 */ |
|
717 public YearMonth plusMonths(long monthsToAdd) { |
|
718 if (monthsToAdd == 0) { |
|
719 return this; |
|
720 } |
|
721 long monthCount = year * 12L + (month - 1); |
|
722 long calcMonths = monthCount + monthsToAdd; // safe overflow |
|
723 int newYear = YEAR.checkValidIntValue(Math.floorDiv(calcMonths, 12)); |
|
724 int newMonth = (int)Math.floorMod(calcMonths, 12) + 1; |
|
725 return with(newYear, newMonth); |
|
726 } |
|
727 |
|
728 //----------------------------------------------------------------------- |
|
729 /** |
|
730 * Returns a copy of this year-month with the specified period subtracted. |
|
731 * <p> |
|
732 * This method returns a new year-month based on this year-month with the specified period subtracted. |
|
733 * The subtractor is typically {@link java.time.Period} but may be any other type implementing |
|
734 * the {@link TemporalSubtractor} interface. |
|
735 * The calculation is delegated to the specified adjuster, which typically calls |
|
736 * back to {@link #minus(long, TemporalUnit)}. |
|
737 * <p> |
|
738 * This instance is immutable and unaffected by this method call. |
|
739 * |
|
740 * @param subtractor the subtractor to use, not null |
|
741 * @return a {@code YearMonth} based on this year-month with the subtraction made, not null |
|
742 * @throws DateTimeException if the subtraction cannot be made |
|
743 * @throws ArithmeticException if numeric overflow occurs |
|
744 */ |
|
745 @Override |
|
746 public YearMonth minus(TemporalSubtractor subtractor) { |
|
747 return (YearMonth) subtractor.subtractFrom(this); |
|
748 } |
|
749 |
|
750 /** |
|
751 * {@inheritDoc} |
|
752 * @throws DateTimeException {@inheritDoc} |
|
753 * @throws ArithmeticException {@inheritDoc} |
|
754 */ |
|
755 @Override |
|
756 public YearMonth minus(long amountToSubtract, TemporalUnit unit) { |
|
757 return (amountToSubtract == Long.MIN_VALUE ? plus(Long.MAX_VALUE, unit).plus(1, unit) : plus(-amountToSubtract, unit)); |
|
758 } |
|
759 |
|
760 /** |
|
761 * Returns a copy of this year-month with the specified period in years subtracted. |
|
762 * <p> |
|
763 * This instance is immutable and unaffected by this method call. |
|
764 * |
|
765 * @param yearsToSubtract the years to subtract, may be negative |
|
766 * @return a {@code YearMonth} based on this year-month with the years subtracted, not null |
|
767 * @throws DateTimeException if the result exceeds the supported range |
|
768 */ |
|
769 public YearMonth minusYears(long yearsToSubtract) { |
|
770 return (yearsToSubtract == Long.MIN_VALUE ? plusYears(Long.MAX_VALUE).plusYears(1) : plusYears(-yearsToSubtract)); |
|
771 } |
|
772 |
|
773 /** |
|
774 * Returns a copy of this year-month with the specified period in months subtracted. |
|
775 * <p> |
|
776 * This instance is immutable and unaffected by this method call. |
|
777 * |
|
778 * @param monthsToSubtract the months to subtract, may be negative |
|
779 * @return a {@code YearMonth} based on this year-month with the months subtracted, not null |
|
780 * @throws DateTimeException if the result exceeds the supported range |
|
781 */ |
|
782 public YearMonth minusMonths(long monthsToSubtract) { |
|
783 return (monthsToSubtract == Long.MIN_VALUE ? plusMonths(Long.MAX_VALUE).plusMonths(1) : plusMonths(-monthsToSubtract)); |
|
784 } |
|
785 |
|
786 //----------------------------------------------------------------------- |
|
787 /** |
|
788 * Queries this year-month using the specified query. |
|
789 * <p> |
|
790 * This queries this year-month using the specified query strategy object. |
|
791 * The {@code TemporalQuery} object defines the logic to be used to |
|
792 * obtain the result. Read the documentation of the query to understand |
|
793 * what the result of this method will be. |
|
794 * <p> |
|
795 * The result of this method is obtained by invoking the |
|
796 * {@link TemporalQuery#queryFrom(TemporalAccessor)} method on the |
|
797 * specified query passing {@code this} as the argument. |
|
798 * |
|
799 * @param <R> the type of the result |
|
800 * @param query the query to invoke, not null |
|
801 * @return the query result, null may be returned (defined by the query) |
|
802 * @throws DateTimeException if unable to query (defined by the query) |
|
803 * @throws ArithmeticException if numeric overflow occurs (defined by the query) |
|
804 */ |
|
805 @SuppressWarnings("unchecked") |
|
806 @Override |
|
807 public <R> R query(TemporalQuery<R> query) { |
|
808 if (query == Queries.chrono()) { |
|
809 return (R) ISOChrono.INSTANCE; |
|
810 } else if (query == Queries.precision()) { |
|
811 return (R) MONTHS; |
|
812 } |
|
813 return Temporal.super.query(query); |
|
814 } |
|
815 |
|
816 /** |
|
817 * Adjusts the specified temporal object to have this year-month. |
|
818 * <p> |
|
819 * This returns a temporal object of the same observable type as the input |
|
820 * with the year and month changed to be the same as this. |
|
821 * <p> |
|
822 * The adjustment is equivalent to using {@link Temporal#with(TemporalField, long)} |
|
823 * passing {@link ChronoField#EPOCH_MONTH} as the field. |
|
824 * If the specified temporal object does not use the ISO calendar system then |
|
825 * a {@code DateTimeException} is thrown. |
|
826 * <p> |
|
827 * In most cases, it is clearer to reverse the calling pattern by using |
|
828 * {@link Temporal#with(TemporalAdjuster)}: |
|
829 * <pre> |
|
830 * // these two lines are equivalent, but the second approach is recommended |
|
831 * temporal = thisYearMonth.adjustInto(temporal); |
|
832 * temporal = temporal.with(thisYearMonth); |
|
833 * </pre> |
|
834 * <p> |
|
835 * This instance is immutable and unaffected by this method call. |
|
836 * |
|
837 * @param temporal the target object to be adjusted, not null |
|
838 * @return the adjusted object, not null |
|
839 * @throws DateTimeException if unable to make the adjustment |
|
840 * @throws ArithmeticException if numeric overflow occurs |
|
841 */ |
|
842 @Override |
|
843 public Temporal adjustInto(Temporal temporal) { |
|
844 if (Chrono.from(temporal).equals(ISOChrono.INSTANCE) == false) { |
|
845 throw new DateTimeException("Adjustment only supported on ISO date-time"); |
|
846 } |
|
847 return temporal.with(EPOCH_MONTH, getEpochMonth()); |
|
848 } |
|
849 |
|
850 /** |
|
851 * Calculates the period between this year-month and another year-month in |
|
852 * terms of the specified unit. |
|
853 * <p> |
|
854 * This calculates the period between two year-months in terms of a single unit. |
|
855 * The start and end points are {@code this} and the specified year-month. |
|
856 * The result will be negative if the end is before the start. |
|
857 * The {@code Temporal} passed to this method must be a {@code YearMonth}. |
|
858 * For example, the period in years between two year-months can be calculated |
|
859 * using {@code startYearMonth.periodUntil(endYearMonth, YEARS)}. |
|
860 * <p> |
|
861 * The calculation returns a whole number, representing the number of |
|
862 * complete units between the two year-months. |
|
863 * For example, the period in decades between 2012-06 and 2032-05 |
|
864 * will only be one decade as it is one month short of two decades. |
|
865 * <p> |
|
866 * This method operates in association with {@link TemporalUnit#between}. |
|
867 * The result of this method is a {@code long} representing the amount of |
|
868 * the specified unit. By contrast, the result of {@code between} is an |
|
869 * object that can be used directly in addition/subtraction: |
|
870 * <pre> |
|
871 * long period = start.periodUntil(end, YEARS); // this method |
|
872 * dateTime.plus(YEARS.between(start, end)); // use in plus/minus |
|
873 * </pre> |
|
874 * <p> |
|
875 * The calculation is implemented in this method for {@link ChronoUnit}. |
|
876 * The units {@code MONTHS}, {@code YEARS}, {@code DECADES}, |
|
877 * {@code CENTURIES}, {@code MILLENNIA} and {@code ERAS} are supported. |
|
878 * Other {@code ChronoUnit} values will throw an exception. |
|
879 * <p> |
|
880 * If the unit is not a {@code ChronoUnit}, then the result of this method |
|
881 * is obtained by invoking {@code TemporalUnit.between(Temporal, Temporal)} |
|
882 * passing {@code this} as the first argument and the input temporal as |
|
883 * the second argument. |
|
884 * <p> |
|
885 * This instance is immutable and unaffected by this method call. |
|
886 * |
|
887 * @param endYearMonth the end year-month, which must be a {@code YearMonth}, not null |
|
888 * @param unit the unit to measure the period in, not null |
|
889 * @return the amount of the period between this year-month and the end year-month |
|
890 * @throws DateTimeException if the period cannot be calculated |
|
891 * @throws ArithmeticException if numeric overflow occurs |
|
892 */ |
|
893 @Override |
|
894 public long periodUntil(Temporal endYearMonth, TemporalUnit unit) { |
|
895 if (endYearMonth instanceof YearMonth == false) { |
|
896 Objects.requireNonNull(endYearMonth, "endYearMonth"); |
|
897 throw new DateTimeException("Unable to calculate period between objects of two different types"); |
|
898 } |
|
899 YearMonth end = (YearMonth) endYearMonth; |
|
900 if (unit instanceof ChronoUnit) { |
|
901 long monthsUntil = end.getEpochMonth() - getEpochMonth(); // no overflow |
|
902 switch ((ChronoUnit) unit) { |
|
903 case MONTHS: return monthsUntil; |
|
904 case YEARS: return monthsUntil / 12; |
|
905 case DECADES: return monthsUntil / 120; |
|
906 case CENTURIES: return monthsUntil / 1200; |
|
907 case MILLENNIA: return monthsUntil / 12000; |
|
908 case ERAS: return end.getLong(ERA) - getLong(ERA); |
|
909 } |
|
910 throw new DateTimeException("Unsupported unit: " + unit.getName()); |
|
911 } |
|
912 return unit.between(this, endYearMonth).getAmount(); |
|
913 } |
|
914 |
|
915 //----------------------------------------------------------------------- |
|
916 /** |
|
917 * Returns a date formed from this year-month at the specified day-of-month. |
|
918 * <p> |
|
919 * This combines this year-month and the specified day-of-month to form a {@code LocalDate}. |
|
920 * The day-of-month value must be valid for the year-month. |
|
921 * <p> |
|
922 * This method can be used as part of a chain to produce a date: |
|
923 * <pre> |
|
924 * LocalDate date = year.atMonth(month).atDay(day); |
|
925 * </pre> |
|
926 * <p> |
|
927 * This instance is immutable and unaffected by this method call. |
|
928 * |
|
929 * @param dayOfMonth the day-of-month to use, from 1 to 31 |
|
930 * @return the date formed from this year-month and the specified day, not null |
|
931 * @throws DateTimeException when the day is invalid for the year-month |
|
932 * @see #isValidDay(int) |
|
933 */ |
|
934 public LocalDate atDay(int dayOfMonth) { |
|
935 return LocalDate.of(year, month, dayOfMonth); |
|
936 } |
|
937 |
|
938 //----------------------------------------------------------------------- |
|
939 /** |
|
940 * Compares this year-month to another year-month. |
|
941 * <p> |
|
942 * The comparison is based first on the value of the year, then on the value of the month. |
|
943 * It is "consistent with equals", as defined by {@link Comparable}. |
|
944 * |
|
945 * @param other the other year-month to compare to, not null |
|
946 * @return the comparator value, negative if less, positive if greater |
|
947 */ |
|
948 @Override |
|
949 public int compareTo(YearMonth other) { |
|
950 int cmp = (year - other.year); |
|
951 if (cmp == 0) { |
|
952 cmp = (month - other.month); |
|
953 } |
|
954 return cmp; |
|
955 } |
|
956 |
|
957 /** |
|
958 * Is this year-month after the specified year-month. |
|
959 * |
|
960 * @param other the other year-month to compare to, not null |
|
961 * @return true if this is after the specified year-month |
|
962 */ |
|
963 public boolean isAfter(YearMonth other) { |
|
964 return compareTo(other) > 0; |
|
965 } |
|
966 |
|
967 /** |
|
968 * Is this year-month before the specified year-month. |
|
969 * |
|
970 * @param other the other year-month to compare to, not null |
|
971 * @return true if this point is before the specified year-month |
|
972 */ |
|
973 public boolean isBefore(YearMonth other) { |
|
974 return compareTo(other) < 0; |
|
975 } |
|
976 |
|
977 //----------------------------------------------------------------------- |
|
978 /** |
|
979 * Checks if this year-month is equal to another year-month. |
|
980 * <p> |
|
981 * The comparison is based on the time-line position of the year-months. |
|
982 * |
|
983 * @param obj the object to check, null returns false |
|
984 * @return true if this is equal to the other year-month |
|
985 */ |
|
986 @Override |
|
987 public boolean equals(Object obj) { |
|
988 if (this == obj) { |
|
989 return true; |
|
990 } |
|
991 if (obj instanceof YearMonth) { |
|
992 YearMonth other = (YearMonth) obj; |
|
993 return year == other.year && month == other.month; |
|
994 } |
|
995 return false; |
|
996 } |
|
997 |
|
998 /** |
|
999 * A hash code for this year-month. |
|
1000 * |
|
1001 * @return a suitable hash code |
|
1002 */ |
|
1003 @Override |
|
1004 public int hashCode() { |
|
1005 return year ^ (month << 27); |
|
1006 } |
|
1007 |
|
1008 //----------------------------------------------------------------------- |
|
1009 /** |
|
1010 * Outputs this year-month as a {@code String}, such as {@code 2007-12}. |
|
1011 * <p> |
|
1012 * The output will be in the format {@code yyyy-MM}: |
|
1013 * |
|
1014 * @return a string representation of this year-month, not null |
|
1015 */ |
|
1016 @Override |
|
1017 public String toString() { |
|
1018 int absYear = Math.abs(year); |
|
1019 StringBuilder buf = new StringBuilder(9); |
|
1020 if (absYear < 1000) { |
|
1021 if (year < 0) { |
|
1022 buf.append(year - 10000).deleteCharAt(1); |
|
1023 } else { |
|
1024 buf.append(year + 10000).deleteCharAt(0); |
|
1025 } |
|
1026 } else { |
|
1027 buf.append(year); |
|
1028 } |
|
1029 return buf.append(month < 10 ? "-0" : "-") |
|
1030 .append(month) |
|
1031 .toString(); |
|
1032 } |
|
1033 |
|
1034 /** |
|
1035 * Outputs this year-month as a {@code String} using the formatter. |
|
1036 * <p> |
|
1037 * This year-month will be passed to the formatter |
|
1038 * {@link DateTimeFormatter#print(TemporalAccessor) print method}. |
|
1039 * |
|
1040 * @param formatter the formatter to use, not null |
|
1041 * @return the formatted year-month string, not null |
|
1042 * @throws DateTimeException if an error occurs during printing |
|
1043 */ |
|
1044 public String toString(DateTimeFormatter formatter) { |
|
1045 Objects.requireNonNull(formatter, "formatter"); |
|
1046 return formatter.print(this); |
|
1047 } |
|
1048 |
|
1049 //----------------------------------------------------------------------- |
|
1050 /** |
|
1051 * Writes the object using a |
|
1052 * <a href="../../../serialized-form.html#java.time.temporal.Ser">dedicated serialized form</a>. |
|
1053 * <pre> |
|
1054 * out.writeByte(5); // identifies this as a Year |
|
1055 * out.writeInt(year); |
|
1056 * out.writeByte(month); |
|
1057 * </pre> |
|
1058 * |
|
1059 * @return the instance of {@code Ser}, not null |
|
1060 */ |
|
1061 private Object writeReplace() { |
|
1062 return new Ser(Ser.YEAR_MONTH_TYPE, this); |
|
1063 } |
|
1064 |
|
1065 /** |
|
1066 * Defend against malicious streams. |
|
1067 * @return never |
|
1068 * @throws InvalidObjectException always |
|
1069 */ |
|
1070 private Object readResolve() throws ObjectStreamException { |
|
1071 throw new InvalidObjectException("Deserialization via serialization delegate"); |
|
1072 } |
|
1073 |
|
1074 void writeExternal(DataOutput out) throws IOException { |
|
1075 out.writeInt(year); |
|
1076 out.writeByte(month); |
|
1077 } |
|
1078 |
|
1079 static YearMonth readExternal(DataInput in) throws IOException { |
|
1080 int year = in.readInt(); |
|
1081 byte month = in.readByte(); |
|
1082 return YearMonth.of(year, month); |
|
1083 } |
|
1084 |
|
1085 } |
|