1 /*
2 * Copyright (c) 1996, 2017, 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 * (C) Copyright Taligent, Inc. 1996-1998 - All Rights Reserved
28 * (C) Copyright IBM Corp. 1996-1998 - All Rights Reserved
29 *
30 * The original version of this source code and documentation is copyrighted
31 * and owned by Taligent, Inc., a wholly-owned subsidiary of IBM. These
32 * materials are provided under terms of a License Agreement between Taligent
33 * and Sun. This technology is protected by multiple US and International
34 * patents. This notice and attribution to Taligent may not be removed.
35 * Taligent is a registered trademark of Taligent, Inc.
36 *
37 */
38
39 package java.util;
40
41 import java.io.IOException;
42 import java.io.ObjectInputStream;
43 import java.io.ObjectOutputStream;
44 import java.io.OptionalDataException;
45 import java.io.Serializable;
46 import java.security.AccessControlContext;
47 import java.security.AccessController;
48 import java.security.PermissionCollection;
49 import java.security.PrivilegedActionException;
50 import java.security.PrivilegedExceptionAction;
51 import java.security.ProtectionDomain;
52 import java.text.DateFormat;
53 import java.text.DateFormatSymbols;
54 import java.time.Instant;
55 import java.util.concurrent.ConcurrentHashMap;
56 import java.util.concurrent.ConcurrentMap;
57 import sun.util.BuddhistCalendar;
58 import sun.util.calendar.ZoneInfo;
59 import sun.util.locale.provider.CalendarDataUtility;
60 import sun.util.locale.provider.LocaleProviderAdapter;
61 import sun.util.locale.provider.TimeZoneNameUtility;
62 import sun.util.spi.CalendarProvider;
63
64 /**
65 * The <code>Calendar</code> class is an abstract class that provides methods
66 * for converting between a specific instant in time and a set of {@link
67 * #fields calendar fields} such as <code>YEAR</code>, <code>MONTH</code>,
68 * <code>DAY_OF_MONTH</code>, <code>HOUR</code>, and so on, and for
69 * manipulating the calendar fields, such as getting the date of the next
70 * week. An instant in time can be represented by a millisecond value that is
71 * an offset from the <a id="Epoch"><em>Epoch</em></a>, January 1, 1970
72 * 00:00:00.000 GMT (Gregorian).
73 *
74 * <p>The class also provides additional fields and methods for
75 * implementing a concrete calendar system outside the package. Those
76 * fields and methods are defined as <code>protected</code>.
77 *
78 * <p>
79 * Like other locale-sensitive classes, <code>Calendar</code> provides a
80 * class method, <code>getInstance</code>, for getting a generally useful
81 * object of this type. <code>Calendar</code>'s <code>getInstance</code> method
82 * returns a <code>Calendar</code> object whose
83 * calendar fields have been initialized with the current date and time:
84 * <blockquote>
85 * <pre>
86 * Calendar rightNow = Calendar.getInstance();
87 * </pre>
88 * </blockquote>
89 *
90 * <p>A <code>Calendar</code> object can produce all the calendar field values
91 * needed to implement the date-time formatting for a particular language and
92 * calendar style (for example, Japanese-Gregorian, Japanese-Traditional).
93 * <code>Calendar</code> defines the range of values returned by
94 * certain calendar fields, as well as their meaning. For example,
95 * the first month of the calendar system has value <code>MONTH ==
96 * JANUARY</code> for all calendars. Other values are defined by the
97 * concrete subclass, such as <code>ERA</code>. See individual field
98 * documentation and subclass documentation for details.
99 *
100 * <h3>Getting and Setting Calendar Field Values</h3>
101 *
102 * <p>The calendar field values can be set by calling the <code>set</code>
103 * methods. Any field values set in a <code>Calendar</code> will not be
104 * interpreted until it needs to calculate its time value (milliseconds from
105 * the Epoch) or values of the calendar fields. Calling the
106 * <code>get</code>, <code>getTimeInMillis</code>, <code>getTime</code>,
107 * <code>add</code> and <code>roll</code> involves such calculation.
108 *
109 * <h4>Leniency</h4>
110 *
111 * <p><code>Calendar</code> has two modes for interpreting the calendar
112 * fields, <em>lenient</em> and <em>non-lenient</em>. When a
113 * <code>Calendar</code> is in lenient mode, it accepts a wider range of
114 * calendar field values than it produces. When a <code>Calendar</code>
115 * recomputes calendar field values for return by <code>get()</code>, all of
116 * the calendar fields are normalized. For example, a lenient
117 * <code>GregorianCalendar</code> interprets <code>MONTH == JANUARY</code>,
118 * <code>DAY_OF_MONTH == 32</code> as February 1.
119
120 * <p>When a <code>Calendar</code> is in non-lenient mode, it throws an
121 * exception if there is any inconsistency in its calendar fields. For
122 * example, a <code>GregorianCalendar</code> always produces
123 * <code>DAY_OF_MONTH</code> values between 1 and the length of the month. A
124 * non-lenient <code>GregorianCalendar</code> throws an exception upon
125 * calculating its time or calendar field values if any out-of-range field
126 * value has been set.
127 *
128 * <h4><a id="first_week">First Week</a></h4>
129 *
130 * <code>Calendar</code> defines a locale-specific seven day week using two
131 * parameters: the first day of the week and the minimal days in first week
132 * (from 1 to 7). These numbers are taken from the locale resource data or the
133 * locale itself when a {@code Calendar} is constructed. If the designated
134 * locale contains "fw" and/or "rg" <a href="./Locale.html#def_locale_extension">
135 * Unicode extensions</a>, the first day of the week will be obtained according to
136 * those extensions. If both "fw" and "rg" are specified, the value from the "fw"
137 * extension supersedes the implicit one from the "rg" extension.
138 * They may also be specified explicitly through the methods for setting their
139 * values.
140 *
141 * <p>When setting or getting the <code>WEEK_OF_MONTH</code> or
142 * <code>WEEK_OF_YEAR</code> fields, <code>Calendar</code> must determine the
143 * first week of the month or year as a reference point. The first week of a
144 * month or year is defined as the earliest seven day period beginning on
145 * <code>getFirstDayOfWeek()</code> and containing at least
146 * <code>getMinimalDaysInFirstWeek()</code> days of that month or year. Weeks
147 * numbered ..., -1, 0 precede the first week; weeks numbered 2, 3,... follow
148 * it. Note that the normalized numbering returned by <code>get()</code> may be
149 * different. For example, a specific <code>Calendar</code> subclass may
150 * designate the week before week 1 of a year as week <code><i>n</i></code> of
151 * the previous year.
152 *
153 * <h4>Calendar Fields Resolution</h4>
154 *
155 * When computing a date and time from the calendar fields, there
156 * may be insufficient information for the computation (such as only
157 * year and month with no day of month), or there may be inconsistent
158 * information (such as Tuesday, July 15, 1996 (Gregorian) -- July 15,
159 * 1996 is actually a Monday). <code>Calendar</code> will resolve
160 * calendar field values to determine the date and time in the
161 * following way.
162 *
163 * <p><a id="resolution">If there is any conflict in calendar field values,
164 * <code>Calendar</code> gives priorities to calendar fields that have been set
165 * more recently.</a> The following are the default combinations of the
166 * calendar fields. The most recent combination, as determined by the
167 * most recently set single field, will be used.
168 *
169 * <p><a id="date_resolution">For the date fields</a>:
170 * <blockquote>
171 * <pre>
172 * YEAR + MONTH + DAY_OF_MONTH
173 * YEAR + MONTH + WEEK_OF_MONTH + DAY_OF_WEEK
174 * YEAR + MONTH + DAY_OF_WEEK_IN_MONTH + DAY_OF_WEEK
175 * YEAR + DAY_OF_YEAR
176 * YEAR + DAY_OF_WEEK + WEEK_OF_YEAR
177 * </pre></blockquote>
178 *
179 * <a id="time_resolution">For the time of day fields</a>:
180 * <blockquote>
181 * <pre>
182 * HOUR_OF_DAY
183 * AM_PM + HOUR
184 * </pre></blockquote>
185 *
186 * <p>If there are any calendar fields whose values haven't been set in the selected
187 * field combination, <code>Calendar</code> uses their default values. The default
188 * value of each field may vary by concrete calendar systems. For example, in
189 * <code>GregorianCalendar</code>, the default of a field is the same as that
190 * of the start of the Epoch: i.e., <code>YEAR = 1970</code>, <code>MONTH =
191 * JANUARY</code>, <code>DAY_OF_MONTH = 1</code>, etc.
192 *
193 * <p>
194 * <strong>Note:</strong> There are certain possible ambiguities in
195 * interpretation of certain singular times, which are resolved in the
196 * following ways:
197 * <ol>
198 * <li> 23:59 is the last minute of the day and 00:00 is the first
199 * minute of the next day. Thus, 23:59 on Dec 31, 1999 < 00:00 on
200 * Jan 1, 2000 < 00:01 on Jan 1, 2000.
201 *
202 * <li> Although historically not precise, midnight also belongs to "am",
203 * and noon belongs to "pm", so on the same day,
204 * 12:00 am (midnight) < 12:01 am, and 12:00 pm (noon) < 12:01 pm
205 * </ol>
206 *
207 * <p>
208 * The date or time format strings are not part of the definition of a
209 * calendar, as those must be modifiable or overridable by the user at
210 * runtime. Use {@link DateFormat}
211 * to format dates.
212 *
213 * <h4>Field Manipulation</h4>
214 *
215 * The calendar fields can be changed using three methods:
216 * <code>set()</code>, <code>add()</code>, and <code>roll()</code>.
217 *
218 * <p><strong><code>set(f, value)</code></strong> changes calendar field
219 * <code>f</code> to <code>value</code>. In addition, it sets an
220 * internal member variable to indicate that calendar field <code>f</code> has
221 * been changed. Although calendar field <code>f</code> is changed immediately,
222 * the calendar's time value in milliseconds is not recomputed until the next call to
223 * <code>get()</code>, <code>getTime()</code>, <code>getTimeInMillis()</code>,
224 * <code>add()</code>, or <code>roll()</code> is made. Thus, multiple calls to
225 * <code>set()</code> do not trigger multiple, unnecessary
226 * computations. As a result of changing a calendar field using
227 * <code>set()</code>, other calendar fields may also change, depending on the
228 * calendar field, the calendar field value, and the calendar system. In addition,
229 * <code>get(f)</code> will not necessarily return <code>value</code> set by
230 * the call to the <code>set</code> method
231 * after the calendar fields have been recomputed. The specifics are determined by
232 * the concrete calendar class.</p>
233 *
234 * <p><em>Example</em>: Consider a <code>GregorianCalendar</code>
235 * originally set to August 31, 1999. Calling <code>set(Calendar.MONTH,
236 * Calendar.SEPTEMBER)</code> sets the date to September 31,
237 * 1999. This is a temporary internal representation that resolves to
238 * October 1, 1999 if <code>getTime()</code>is then called. However, a
239 * call to <code>set(Calendar.DAY_OF_MONTH, 30)</code> before the call to
240 * <code>getTime()</code> sets the date to September 30, 1999, since
241 * no recomputation occurs after <code>set()</code> itself.</p>
242 *
243 * <p><strong><code>add(f, delta)</code></strong> adds <code>delta</code>
244 * to field <code>f</code>. This is equivalent to calling <code>set(f,
245 * get(f) + delta)</code> with two adjustments:</p>
246 *
247 * <blockquote>
248 * <p><strong>Add rule 1</strong>. The value of field <code>f</code>
249 * after the call minus the value of field <code>f</code> before the
250 * call is <code>delta</code>, modulo any overflow that has occurred in
251 * field <code>f</code>. Overflow occurs when a field value exceeds its
252 * range and, as a result, the next larger field is incremented or
253 * decremented and the field value is adjusted back into its range.</p>
254 *
255 * <p><strong>Add rule 2</strong>. If a smaller field is expected to be
256 * invariant, but it is impossible for it to be equal to its
257 * prior value because of changes in its minimum or maximum after field
258 * <code>f</code> is changed or other constraints, such as time zone
259 * offset changes, then its value is adjusted to be as close
260 * as possible to its expected value. A smaller field represents a
261 * smaller unit of time. <code>HOUR</code> is a smaller field than
262 * <code>DAY_OF_MONTH</code>. No adjustment is made to smaller fields
263 * that are not expected to be invariant. The calendar system
264 * determines what fields are expected to be invariant.</p>
265 * </blockquote>
266 *
267 * <p>In addition, unlike <code>set()</code>, <code>add()</code> forces
268 * an immediate recomputation of the calendar's milliseconds and all
269 * fields.</p>
270 *
271 * <p><em>Example</em>: Consider a <code>GregorianCalendar</code>
272 * originally set to August 31, 1999. Calling <code>add(Calendar.MONTH,
273 * 13)</code> sets the calendar to September 30, 2000. <strong>Add rule
274 * 1</strong> sets the <code>MONTH</code> field to September, since
275 * adding 13 months to August gives September of the next year. Since
276 * <code>DAY_OF_MONTH</code> cannot be 31 in September in a
277 * <code>GregorianCalendar</code>, <strong>add rule 2</strong> sets the
278 * <code>DAY_OF_MONTH</code> to 30, the closest possible value. Although
279 * it is a smaller field, <code>DAY_OF_WEEK</code> is not adjusted by
280 * rule 2, since it is expected to change when the month changes in a
281 * <code>GregorianCalendar</code>.</p>
282 *
283 * <p><strong><code>roll(f, delta)</code></strong> adds
284 * <code>delta</code> to field <code>f</code> without changing larger
285 * fields. This is equivalent to calling <code>add(f, delta)</code> with
286 * the following adjustment:</p>
287 *
288 * <blockquote>
289 * <p><strong>Roll rule</strong>. Larger fields are unchanged after the
290 * call. A larger field represents a larger unit of
291 * time. <code>DAY_OF_MONTH</code> is a larger field than
292 * <code>HOUR</code>.</p>
293 * </blockquote>
294 *
295 * <p><em>Example</em>: See {@link java.util.GregorianCalendar#roll(int, int)}.
296 *
297 * <p><strong>Usage model</strong>. To motivate the behavior of
298 * <code>add()</code> and <code>roll()</code>, consider a user interface
299 * component with increment and decrement buttons for the month, day, and
300 * year, and an underlying <code>GregorianCalendar</code>. If the
301 * interface reads January 31, 1999 and the user presses the month
302 * increment button, what should it read? If the underlying
303 * implementation uses <code>set()</code>, it might read March 3, 1999. A
304 * better result would be February 28, 1999. Furthermore, if the user
305 * presses the month increment button again, it should read March 31,
306 * 1999, not March 28, 1999. By saving the original date and using either
307 * <code>add()</code> or <code>roll()</code>, depending on whether larger
308 * fields should be affected, the user interface can behave as most users
309 * will intuitively expect.</p>
310 *
311 * @see java.lang.System#currentTimeMillis()
312 * @see Date
313 * @see GregorianCalendar
314 * @see TimeZone
315 * @see java.text.DateFormat
316 * @author Mark Davis, David Goldsmith, Chen-Lieh Huang, Alan Liu
317 * @since 1.1
318 */
319 public abstract class Calendar implements Serializable, Cloneable, Comparable<Calendar> {
320
321 // Data flow in Calendar
322 // ---------------------
323
324 // The current time is represented in two ways by Calendar: as UTC
325 // milliseconds from the epoch (1 January 1970 0:00 UTC), and as local
326 // fields such as MONTH, HOUR, AM_PM, etc. It is possible to compute the
327 // millis from the fields, and vice versa. The data needed to do this
328 // conversion is encapsulated by a TimeZone object owned by the Calendar.
329 // The data provided by the TimeZone object may also be overridden if the
330 // user sets the ZONE_OFFSET and/or DST_OFFSET fields directly. The class
331 // keeps track of what information was most recently set by the caller, and
332 // uses that to compute any other information as needed.
333
334 // If the user sets the fields using set(), the data flow is as follows.
335 // This is implemented by the Calendar subclass's computeTime() method.
336 // During this process, certain fields may be ignored. The disambiguation
337 // algorithm for resolving which fields to pay attention to is described
338 // in the class documentation.
339
340 // local fields (YEAR, MONTH, DATE, HOUR, MINUTE, etc.)
341 // |
342 // | Using Calendar-specific algorithm
343 // V
344 // local standard millis
345 // |
346 // | Using TimeZone or user-set ZONE_OFFSET / DST_OFFSET
347 // V
348 // UTC millis (in time data member)
349
350 // If the user sets the UTC millis using setTime() or setTimeInMillis(),
351 // the data flow is as follows. This is implemented by the Calendar
352 // subclass's computeFields() method.
353
354 // UTC millis (in time data member)
355 // |
356 // | Using TimeZone getOffset()
357 // V
358 // local standard millis
359 // |
360 // | Using Calendar-specific algorithm
361 // V
362 // local fields (YEAR, MONTH, DATE, HOUR, MINUTE, etc.)
363
364 // In general, a round trip from fields, through local and UTC millis, and
365 // back out to fields is made when necessary. This is implemented by the
366 // complete() method. Resolving a partial set of fields into a UTC millis
367 // value allows all remaining fields to be generated from that value. If
368 // the Calendar is lenient, the fields are also renormalized to standard
369 // ranges when they are regenerated.
370
371 /**
372 * Field number for <code>get</code> and <code>set</code> indicating the
373 * era, e.g., AD or BC in the Julian calendar. This is a calendar-specific
374 * value; see subclass documentation.
375 *
376 * @see GregorianCalendar#AD
377 * @see GregorianCalendar#BC
378 */
379 public static final int ERA = 0;
380
381 /**
382 * Field number for <code>get</code> and <code>set</code> indicating the
383 * year. This is a calendar-specific value; see subclass documentation.
384 */
385 public static final int YEAR = 1;
386
387 /**
388 * Field number for <code>get</code> and <code>set</code> indicating the
389 * month. This is a calendar-specific value. The first month of
390 * the year in the Gregorian and Julian calendars is
391 * <code>JANUARY</code> which is 0; the last depends on the number
392 * of months in a year.
393 *
394 * @see #JANUARY
395 * @see #FEBRUARY
396 * @see #MARCH
397 * @see #APRIL
398 * @see #MAY
399 * @see #JUNE
400 * @see #JULY
401 * @see #AUGUST
402 * @see #SEPTEMBER
403 * @see #OCTOBER
404 * @see #NOVEMBER
405 * @see #DECEMBER
406 * @see #UNDECIMBER
407 */
408 public static final int MONTH = 2;
409
410 /**
411 * Field number for <code>get</code> and <code>set</code> indicating the
412 * week number within the current year. The first week of the year, as
413 * defined by <code>getFirstDayOfWeek()</code> and
414 * <code>getMinimalDaysInFirstWeek()</code>, has value 1. Subclasses define
415 * the value of <code>WEEK_OF_YEAR</code> for days before the first week of
416 * the year.
417 *
418 * @see #getFirstDayOfWeek
419 * @see #getMinimalDaysInFirstWeek
420 */
421 public static final int WEEK_OF_YEAR = 3;
422
423 /**
424 * Field number for <code>get</code> and <code>set</code> indicating the
425 * week number within the current month. The first week of the month, as
426 * defined by <code>getFirstDayOfWeek()</code> and
427 * <code>getMinimalDaysInFirstWeek()</code>, has value 1. Subclasses define
428 * the value of <code>WEEK_OF_MONTH</code> for days before the first week of
429 * the month.
430 *
431 * @see #getFirstDayOfWeek
432 * @see #getMinimalDaysInFirstWeek
433 */
434 public static final int WEEK_OF_MONTH = 4;
435
436 /**
437 * Field number for <code>get</code> and <code>set</code> indicating the
438 * day of the month. This is a synonym for <code>DAY_OF_MONTH</code>.
439 * The first day of the month has value 1.
440 *
441 * @see #DAY_OF_MONTH
442 */
443 public static final int DATE = 5;
444
445 /**
446 * Field number for <code>get</code> and <code>set</code> indicating the
447 * day of the month. This is a synonym for <code>DATE</code>.
448 * The first day of the month has value 1.
449 *
450 * @see #DATE
451 */
452 public static final int DAY_OF_MONTH = 5;
453
454 /**
455 * Field number for <code>get</code> and <code>set</code> indicating the day
456 * number within the current year. The first day of the year has value 1.
457 */
458 public static final int DAY_OF_YEAR = 6;
459
460 /**
461 * Field number for <code>get</code> and <code>set</code> indicating the day
462 * of the week. This field takes values <code>SUNDAY</code>,
463 * <code>MONDAY</code>, <code>TUESDAY</code>, <code>WEDNESDAY</code>,
464 * <code>THURSDAY</code>, <code>FRIDAY</code>, and <code>SATURDAY</code>.
465 *
466 * @see #SUNDAY
467 * @see #MONDAY
468 * @see #TUESDAY
469 * @see #WEDNESDAY
470 * @see #THURSDAY
471 * @see #FRIDAY
472 * @see #SATURDAY
473 */
474 public static final int DAY_OF_WEEK = 7;
475
476 /**
477 * Field number for <code>get</code> and <code>set</code> indicating the
478 * ordinal number of the day of the week within the current month. Together
479 * with the <code>DAY_OF_WEEK</code> field, this uniquely specifies a day
480 * within a month. Unlike <code>WEEK_OF_MONTH</code> and
481 * <code>WEEK_OF_YEAR</code>, this field's value does <em>not</em> depend on
482 * <code>getFirstDayOfWeek()</code> or
483 * <code>getMinimalDaysInFirstWeek()</code>. <code>DAY_OF_MONTH 1</code>
484 * through <code>7</code> always correspond to <code>DAY_OF_WEEK_IN_MONTH
485 * 1</code>; <code>8</code> through <code>14</code> correspond to
486 * <code>DAY_OF_WEEK_IN_MONTH 2</code>, and so on.
487 * <code>DAY_OF_WEEK_IN_MONTH 0</code> indicates the week before
488 * <code>DAY_OF_WEEK_IN_MONTH 1</code>. Negative values count back from the
489 * end of the month, so the last Sunday of a month is specified as
490 * <code>DAY_OF_WEEK = SUNDAY, DAY_OF_WEEK_IN_MONTH = -1</code>. Because
491 * negative values count backward they will usually be aligned differently
492 * within the month than positive values. For example, if a month has 31
493 * days, <code>DAY_OF_WEEK_IN_MONTH -1</code> will overlap
494 * <code>DAY_OF_WEEK_IN_MONTH 5</code> and the end of <code>4</code>.
495 *
496 * @see #DAY_OF_WEEK
497 * @see #WEEK_OF_MONTH
498 */
499 public static final int DAY_OF_WEEK_IN_MONTH = 8;
500
501 /**
502 * Field number for <code>get</code> and <code>set</code> indicating
503 * whether the <code>HOUR</code> is before or after noon.
504 * E.g., at 10:04:15.250 PM the <code>AM_PM</code> is <code>PM</code>.
505 *
506 * @see #AM
507 * @see #PM
508 * @see #HOUR
509 */
510 public static final int AM_PM = 9;
511
512 /**
513 * Field number for <code>get</code> and <code>set</code> indicating the
514 * hour of the morning or afternoon. <code>HOUR</code> is used for the
515 * 12-hour clock (0 - 11). Noon and midnight are represented by 0, not by 12.
516 * E.g., at 10:04:15.250 PM the <code>HOUR</code> is 10.
517 *
518 * @see #AM_PM
519 * @see #HOUR_OF_DAY
520 */
521 public static final int HOUR = 10;
522
523 /**
524 * Field number for <code>get</code> and <code>set</code> indicating the
525 * hour of the day. <code>HOUR_OF_DAY</code> is used for the 24-hour clock.
526 * E.g., at 10:04:15.250 PM the <code>HOUR_OF_DAY</code> is 22.
527 *
528 * @see #HOUR
529 */
530 public static final int HOUR_OF_DAY = 11;
531
532 /**
533 * Field number for <code>get</code> and <code>set</code> indicating the
534 * minute within the hour.
535 * E.g., at 10:04:15.250 PM the <code>MINUTE</code> is 4.
536 */
537 public static final int MINUTE = 12;
538
539 /**
540 * Field number for <code>get</code> and <code>set</code> indicating the
541 * second within the minute.
542 * E.g., at 10:04:15.250 PM the <code>SECOND</code> is 15.
543 */
544 public static final int SECOND = 13;
545
546 /**
547 * Field number for <code>get</code> and <code>set</code> indicating the
548 * millisecond within the second.
549 * E.g., at 10:04:15.250 PM the <code>MILLISECOND</code> is 250.
550 */
551 public static final int MILLISECOND = 14;
552
553 /**
554 * Field number for <code>get</code> and <code>set</code>
555 * indicating the raw offset from GMT in milliseconds.
556 * <p>
557 * This field reflects the correct GMT offset value of the time
558 * zone of this <code>Calendar</code> if the
559 * <code>TimeZone</code> implementation subclass supports
560 * historical GMT offset changes.
561 */
562 public static final int ZONE_OFFSET = 15;
563
564 /**
565 * Field number for <code>get</code> and <code>set</code> indicating the
566 * daylight saving offset in milliseconds.
567 * <p>
568 * This field reflects the correct daylight saving offset value of
569 * the time zone of this <code>Calendar</code> if the
570 * <code>TimeZone</code> implementation subclass supports
571 * historical Daylight Saving Time schedule changes.
572 */
573 public static final int DST_OFFSET = 16;
574
575 /**
576 * The number of distinct fields recognized by <code>get</code> and <code>set</code>.
577 * Field numbers range from <code>0..FIELD_COUNT-1</code>.
578 */
579 public static final int FIELD_COUNT = 17;
580
581 /**
582 * Value of the {@link #DAY_OF_WEEK} field indicating
583 * Sunday.
584 */
585 public static final int SUNDAY = 1;
586
587 /**
588 * Value of the {@link #DAY_OF_WEEK} field indicating
589 * Monday.
590 */
591 public static final int MONDAY = 2;
592
593 /**
594 * Value of the {@link #DAY_OF_WEEK} field indicating
595 * Tuesday.
596 */
597 public static final int TUESDAY = 3;
598
599 /**
600 * Value of the {@link #DAY_OF_WEEK} field indicating
601 * Wednesday.
602 */
603 public static final int WEDNESDAY = 4;
604
605 /**
606 * Value of the {@link #DAY_OF_WEEK} field indicating
607 * Thursday.
608 */
609 public static final int THURSDAY = 5;
610
611 /**
612 * Value of the {@link #DAY_OF_WEEK} field indicating
613 * Friday.
614 */
615 public static final int FRIDAY = 6;
616
617 /**
618 * Value of the {@link #DAY_OF_WEEK} field indicating
619 * Saturday.
620 */
621 public static final int SATURDAY = 7;
622
623 /**
624 * Value of the {@link #MONTH} field indicating the
625 * first month of the year in the Gregorian and Julian calendars.
626 */
627 public static final int JANUARY = 0;
628
629 /**
630 * Value of the {@link #MONTH} field indicating the
631 * second month of the year in the Gregorian and Julian calendars.
632 */
633 public static final int FEBRUARY = 1;
634
635 /**
636 * Value of the {@link #MONTH} field indicating the
637 * third month of the year in the Gregorian and Julian calendars.
638 */
639 public static final int MARCH = 2;
640
641 /**
642 * Value of the {@link #MONTH} field indicating the
643 * fourth month of the year in the Gregorian and Julian calendars.
644 */
645 public static final int APRIL = 3;
646
647 /**
648 * Value of the {@link #MONTH} field indicating the
649 * fifth month of the year in the Gregorian and Julian calendars.
650 */
651 public static final int MAY = 4;
652
653 /**
654 * Value of the {@link #MONTH} field indicating the
655 * sixth month of the year in the Gregorian and Julian calendars.
656 */
657 public static final int JUNE = 5;
658
659 /**
660 * Value of the {@link #MONTH} field indicating the
661 * seventh month of the year in the Gregorian and Julian calendars.
662 */
663 public static final int JULY = 6;
664
665 /**
666 * Value of the {@link #MONTH} field indicating the
667 * eighth month of the year in the Gregorian and Julian calendars.
668 */
669 public static final int AUGUST = 7;
670
671 /**
672 * Value of the {@link #MONTH} field indicating the
673 * ninth month of the year in the Gregorian and Julian calendars.
674 */
675 public static final int SEPTEMBER = 8;
676
677 /**
678 * Value of the {@link #MONTH} field indicating the
679 * tenth month of the year in the Gregorian and Julian calendars.
680 */
681 public static final int OCTOBER = 9;
682
683 /**
684 * Value of the {@link #MONTH} field indicating the
685 * eleventh month of the year in the Gregorian and Julian calendars.
686 */
687 public static final int NOVEMBER = 10;
688
689 /**
690 * Value of the {@link #MONTH} field indicating the
691 * twelfth month of the year in the Gregorian and Julian calendars.
692 */
693 public static final int DECEMBER = 11;
694
695 /**
696 * Value of the {@link #MONTH} field indicating the
697 * thirteenth month of the year. Although <code>GregorianCalendar</code>
698 * does not use this value, lunar calendars do.
699 */
700 public static final int UNDECIMBER = 12;
701
702 /**
703 * Value of the {@link #AM_PM} field indicating the
704 * period of the day from midnight to just before noon.
705 */
706 public static final int AM = 0;
707
708 /**
709 * Value of the {@link #AM_PM} field indicating the
710 * period of the day from noon to just before midnight.
711 */
712 public static final int PM = 1;
713
714 /**
715 * A style specifier for {@link #getDisplayNames(int, int, Locale)
716 * getDisplayNames} indicating names in all styles, such as
717 * "January" and "Jan".
718 *
719 * @see #SHORT_FORMAT
720 * @see #LONG_FORMAT
721 * @see #SHORT_STANDALONE
722 * @see #LONG_STANDALONE
723 * @see #SHORT
724 * @see #LONG
725 * @since 1.6
726 */
727 public static final int ALL_STYLES = 0;
728
729 static final int STANDALONE_MASK = 0x8000;
730
731 /**
732 * A style specifier for {@link #getDisplayName(int, int, Locale)
733 * getDisplayName} and {@link #getDisplayNames(int, int, Locale)
734 * getDisplayNames} equivalent to {@link #SHORT_FORMAT}.
735 *
736 * @see #SHORT_STANDALONE
737 * @see #LONG
738 * @since 1.6
739 */
740 public static final int SHORT = 1;
741
742 /**
743 * A style specifier for {@link #getDisplayName(int, int, Locale)
744 * getDisplayName} and {@link #getDisplayNames(int, int, Locale)
745 * getDisplayNames} equivalent to {@link #LONG_FORMAT}.
746 *
747 * @see #LONG_STANDALONE
748 * @see #SHORT
749 * @since 1.6
750 */
751 public static final int LONG = 2;
752
753 /**
754 * A style specifier for {@link #getDisplayName(int, int, Locale)
755 * getDisplayName} and {@link #getDisplayNames(int, int, Locale)
756 * getDisplayNames} indicating a narrow name used for format. Narrow names
757 * are typically single character strings, such as "M" for Monday.
758 *
759 * @see #NARROW_STANDALONE
760 * @see #SHORT_FORMAT
761 * @see #LONG_FORMAT
762 * @since 1.8
763 */
764 public static final int NARROW_FORMAT = 4;
765
766 /**
767 * A style specifier for {@link #getDisplayName(int, int, Locale)
768 * getDisplayName} and {@link #getDisplayNames(int, int, Locale)
769 * getDisplayNames} indicating a narrow name independently. Narrow names
770 * are typically single character strings, such as "M" for Monday.
771 *
772 * @see #NARROW_FORMAT
773 * @see #SHORT_STANDALONE
774 * @see #LONG_STANDALONE
775 * @since 1.8
776 */
777 public static final int NARROW_STANDALONE = NARROW_FORMAT | STANDALONE_MASK;
778
779 /**
780 * A style specifier for {@link #getDisplayName(int, int, Locale)
781 * getDisplayName} and {@link #getDisplayNames(int, int, Locale)
782 * getDisplayNames} indicating a short name used for format.
783 *
784 * @see #SHORT_STANDALONE
785 * @see #LONG_FORMAT
786 * @see #LONG_STANDALONE
787 * @since 1.8
788 */
789 public static final int SHORT_FORMAT = 1;
790
791 /**
792 * A style specifier for {@link #getDisplayName(int, int, Locale)
793 * getDisplayName} and {@link #getDisplayNames(int, int, Locale)
794 * getDisplayNames} indicating a long name used for format.
795 *
796 * @see #LONG_STANDALONE
797 * @see #SHORT_FORMAT
798 * @see #SHORT_STANDALONE
799 * @since 1.8
800 */
801 public static final int LONG_FORMAT = 2;
802
803 /**
804 * A style specifier for {@link #getDisplayName(int, int, Locale)
805 * getDisplayName} and {@link #getDisplayNames(int, int, Locale)
806 * getDisplayNames} indicating a short name used independently,
807 * such as a month abbreviation as calendar headers.
808 *
809 * @see #SHORT_FORMAT
810 * @see #LONG_FORMAT
811 * @see #LONG_STANDALONE
812 * @since 1.8
813 */
814 public static final int SHORT_STANDALONE = SHORT | STANDALONE_MASK;
815
816 /**
817 * A style specifier for {@link #getDisplayName(int, int, Locale)
818 * getDisplayName} and {@link #getDisplayNames(int, int, Locale)
819 * getDisplayNames} indicating a long name used independently,
820 * such as a month name as calendar headers.
821 *
822 * @see #LONG_FORMAT
823 * @see #SHORT_FORMAT
824 * @see #SHORT_STANDALONE
825 * @since 1.8
826 */
827 public static final int LONG_STANDALONE = LONG | STANDALONE_MASK;
828
829 // Internal notes:
830 // Calendar contains two kinds of time representations: current "time" in
831 // milliseconds, and a set of calendar "fields" representing the current time.
832 // The two representations are usually in sync, but can get out of sync
833 // as follows.
834 // 1. Initially, no fields are set, and the time is invalid.
835 // 2. If the time is set, all fields are computed and in sync.
836 // 3. If a single field is set, the time is invalid.
837 // Recomputation of the time and fields happens when the object needs
838 // to return a result to the user, or use a result for a computation.
839
840 /**
841 * The calendar field values for the currently set time for this calendar.
842 * This is an array of <code>FIELD_COUNT</code> integers, with index values
843 * <code>ERA</code> through <code>DST_OFFSET</code>.
844 * @serial
845 */
846 @SuppressWarnings("ProtectedField")
847 protected int fields[];
848
849 /**
850 * The flags which tell if a specified calendar field for the calendar is set.
851 * A new object has no fields set. After the first call to a method
852 * which generates the fields, they all remain set after that.
853 * This is an array of <code>FIELD_COUNT</code> booleans, with index values
854 * <code>ERA</code> through <code>DST_OFFSET</code>.
855 * @serial
856 */
857 @SuppressWarnings("ProtectedField")
858 protected boolean isSet[];
859
860 /**
861 * Pseudo-time-stamps which specify when each field was set. There
862 * are two special values, UNSET and COMPUTED. Values from
863 * MINIMUM_USER_SET to Integer.MAX_VALUE are legal user set values.
864 */
865 private transient int stamp[];
866
867 /**
868 * The currently set time for this calendar, expressed in milliseconds after
869 * January 1, 1970, 0:00:00 GMT.
870 * @see #isTimeSet
871 * @serial
872 */
873 @SuppressWarnings("ProtectedField")
874 protected long time;
875
876 /**
877 * True if then the value of <code>time</code> is valid.
878 * The time is made invalid by a change to an item of <code>field[]</code>.
879 * @see #time
880 * @serial
881 */
882 @SuppressWarnings("ProtectedField")
883 protected boolean isTimeSet;
884
885 /**
886 * True if <code>fields[]</code> are in sync with the currently set time.
887 * If false, then the next attempt to get the value of a field will
888 * force a recomputation of all fields from the current value of
889 * <code>time</code>.
890 * @serial
891 */
892 @SuppressWarnings("ProtectedField")
893 protected boolean areFieldsSet;
894
895 /**
896 * True if all fields have been set.
897 * @serial
898 */
899 transient boolean areAllFieldsSet;
900
901 /**
902 * <code>True</code> if this calendar allows out-of-range field values during computation
903 * of <code>time</code> from <code>fields[]</code>.
904 * @see #setLenient
905 * @see #isLenient
906 * @serial
907 */
908 private boolean lenient = true;
909
910 /**
911 * The <code>TimeZone</code> used by this calendar. <code>Calendar</code>
912 * uses the time zone data to translate between locale and GMT time.
913 * @serial
914 */
915 private TimeZone zone;
916
917 /**
918 * <code>True</code> if zone references to a shared TimeZone object.
919 */
920 private transient boolean sharedZone = false;
921
922 /**
923 * The first day of the week, with possible values <code>SUNDAY</code>,
924 * <code>MONDAY</code>, etc. This is a locale-dependent value.
925 * @serial
926 */
927 private int firstDayOfWeek;
928
929 /**
930 * The number of days required for the first week in a month or year,
931 * with possible values from 1 to 7. This is a locale-dependent value.
932 * @serial
933 */
934 private int minimalDaysInFirstWeek;
935
936 /**
937 * Cache to hold the firstDayOfWeek and minimalDaysInFirstWeek
938 * of a Locale.
939 */
940 private static final ConcurrentMap<Locale, int[]> cachedLocaleData
941 = new ConcurrentHashMap<>(3);
942
943 // Special values of stamp[]
944 /**
945 * The corresponding fields[] has no value.
946 */
947 private static final int UNSET = 0;
948
949 /**
950 * The value of the corresponding fields[] has been calculated internally.
951 */
952 private static final int COMPUTED = 1;
953
954 /**
955 * The value of the corresponding fields[] has been set externally. Stamp
956 * values which are greater than 1 represents the (pseudo) time when the
957 * corresponding fields[] value was set.
958 */
959 private static final int MINIMUM_USER_STAMP = 2;
960
961 /**
962 * The mask value that represents all of the fields.
963 */
964 static final int ALL_FIELDS = (1 << FIELD_COUNT) - 1;
965
966 /**
967 * The next available value for <code>stamp[]</code>, an internal array.
968 * This actually should not be written out to the stream, and will probably
969 * be removed from the stream in the near future. In the meantime,
970 * a value of <code>MINIMUM_USER_STAMP</code> should be used.
971 * @serial
972 */
973 private int nextStamp = MINIMUM_USER_STAMP;
974
975 // the internal serial version which says which version was written
976 // - 0 (default) for version up to JDK 1.1.5
977 // - 1 for version from JDK 1.1.6, which writes a correct 'time' value
978 // as well as compatible values for other fields. This is a
979 // transitional format.
980 // - 2 (not implemented yet) a future version, in which fields[],
981 // areFieldsSet, and isTimeSet become transient, and isSet[] is
982 // removed. In JDK 1.1.6 we write a format compatible with version 2.
983 static final int currentSerialVersion = 1;
984
985 /**
986 * The version of the serialized data on the stream. Possible values:
987 * <dl>
988 * <dt><b>0</b> or not present on stream</dt>
989 * <dd>
990 * JDK 1.1.5 or earlier.
991 * </dd>
992 * <dt><b>1</b></dt>
993 * <dd>
994 * JDK 1.1.6 or later. Writes a correct 'time' value
995 * as well as compatible values for other fields. This is a
996 * transitional format.
997 * </dd>
998 * </dl>
999 * When streaming out this class, the most recent format
1000 * and the highest allowable <code>serialVersionOnStream</code>
1001 * is written.
1002 * @serial
1003 * @since 1.1.6
1004 */
1005 private int serialVersionOnStream = currentSerialVersion;
1006
1007 // Proclaim serialization compatibility with JDK 1.1
1008 static final long serialVersionUID = -1807547505821590642L;
1009
1010 // Mask values for calendar fields
1011 @SuppressWarnings("PointlessBitwiseExpression")
1012 static final int ERA_MASK = (1 << ERA);
1013 static final int YEAR_MASK = (1 << YEAR);
1014 static final int MONTH_MASK = (1 << MONTH);
1015 static final int WEEK_OF_YEAR_MASK = (1 << WEEK_OF_YEAR);
1016 static final int WEEK_OF_MONTH_MASK = (1 << WEEK_OF_MONTH);
1017 static final int DAY_OF_MONTH_MASK = (1 << DAY_OF_MONTH);
1018 static final int DATE_MASK = DAY_OF_MONTH_MASK;
1019 static final int DAY_OF_YEAR_MASK = (1 << DAY_OF_YEAR);
1020 static final int DAY_OF_WEEK_MASK = (1 << DAY_OF_WEEK);
1021 static final int DAY_OF_WEEK_IN_MONTH_MASK = (1 << DAY_OF_WEEK_IN_MONTH);
1022 static final int AM_PM_MASK = (1 << AM_PM);
1023 static final int HOUR_MASK = (1 << HOUR);
1024 static final int HOUR_OF_DAY_MASK = (1 << HOUR_OF_DAY);
1025 static final int MINUTE_MASK = (1 << MINUTE);
1026 static final int SECOND_MASK = (1 << SECOND);
1027 static final int MILLISECOND_MASK = (1 << MILLISECOND);
1028 static final int ZONE_OFFSET_MASK = (1 << ZONE_OFFSET);
1029 static final int DST_OFFSET_MASK = (1 << DST_OFFSET);
1030
1031 /**
1032 * {@code Calendar.Builder} is used for creating a {@code Calendar} from
1033 * various date-time parameters.
1034 *
1035 * <p>There are two ways to set a {@code Calendar} to a date-time value. One
1036 * is to set the instant parameter to a millisecond offset from the <a
1037 * href="Calendar.html#Epoch">Epoch</a>. The other is to set individual
1038 * field parameters, such as {@link Calendar#YEAR YEAR}, to their desired
1039 * values. These two ways can't be mixed. Trying to set both the instant and
1040 * individual fields will cause an {@link IllegalStateException} to be
1041 * thrown. However, it is permitted to override previous values of the
1042 * instant or field parameters.
1043 *
1044 * <p>If no enough field parameters are given for determining date and/or
1045 * time, calendar specific default values are used when building a
1046 * {@code Calendar}. For example, if the {@link Calendar#YEAR YEAR} value
1047 * isn't given for the Gregorian calendar, 1970 will be used. If there are
1048 * any conflicts among field parameters, the <a
1049 * href="Calendar.html#resolution"> resolution rules</a> are applied.
1050 * Therefore, the order of field setting matters.
1051 *
1052 * <p>In addition to the date-time parameters,
1053 * the {@linkplain #setLocale(Locale) locale},
1054 * {@linkplain #setTimeZone(TimeZone) time zone},
1055 * {@linkplain #setWeekDefinition(int, int) week definition}, and
1056 * {@linkplain #setLenient(boolean) leniency mode} parameters can be set.
1057 *
1058 * <p><b>Examples</b>
1059 * <p>The following are sample usages. Sample code assumes that the
1060 * {@code Calendar} constants are statically imported.
1061 *
1062 * <p>The following code produces a {@code Calendar} with date 2012-12-31
1063 * (Gregorian) because Monday is the first day of a week with the <a
1064 * href="GregorianCalendar.html#iso8601_compatible_setting"> ISO 8601
1065 * compatible week parameters</a>.
1066 * <pre>
1067 * Calendar cal = new Calendar.Builder().setCalendarType("iso8601")
1068 * .setWeekDate(2013, 1, MONDAY).build();</pre>
1069 * <p>The following code produces a Japanese {@code Calendar} with date
1070 * 1989-01-08 (Gregorian), assuming that the default {@link Calendar#ERA ERA}
1071 * is <em>Heisei</em> that started on that day.
1072 * <pre>
1073 * Calendar cal = new Calendar.Builder().setCalendarType("japanese")
1074 * .setFields(YEAR, 1, DAY_OF_YEAR, 1).build();</pre>
1075 *
1076 * @since 1.8
1077 * @see Calendar#getInstance(TimeZone, Locale)
1078 * @see Calendar#fields
1079 */
1080 public static class Builder {
1081 private static final int NFIELDS = FIELD_COUNT + 1; // +1 for WEEK_YEAR
1082 private static final int WEEK_YEAR = FIELD_COUNT;
1083
1084 private long instant;
1085 // Calendar.stamp[] (lower half) and Calendar.fields[] (upper half) combined
1086 private int[] fields;
1087 // Pseudo timestamp starting from MINIMUM_USER_STAMP.
1088 // (COMPUTED is used to indicate that the instant has been set.)
1089 private int nextStamp;
1090 // maxFieldIndex keeps the max index of fields which have been set.
1091 // (WEEK_YEAR is never included.)
1092 private int maxFieldIndex;
1093 private String type;
1094 private TimeZone zone;
1095 private boolean lenient = true;
1096 private Locale locale;
1097 private int firstDayOfWeek, minimalDaysInFirstWeek;
1098
1099 /**
1100 * Constructs a {@code Calendar.Builder}.
1101 */
1102 public Builder() {
1103 }
1104
1105 /**
1106 * Sets the instant parameter to the given {@code instant} value that is
1107 * a millisecond offset from <a href="Calendar.html#Epoch">the
1108 * Epoch</a>.
1109 *
1110 * @param instant a millisecond offset from the Epoch
1111 * @return this {@code Calendar.Builder}
1112 * @throws IllegalStateException if any of the field parameters have
1113 * already been set
1114 * @see Calendar#setTime(Date)
1115 * @see Calendar#setTimeInMillis(long)
1116 * @see Calendar#time
1117 */
1118 public Builder setInstant(long instant) {
1119 if (fields != null) {
1120 throw new IllegalStateException();
1121 }
1122 this.instant = instant;
1123 nextStamp = COMPUTED;
1124 return this;
1125 }
1126
1127 /**
1128 * Sets the instant parameter to the {@code instant} value given by a
1129 * {@link Date}. This method is equivalent to a call to
1130 * {@link #setInstant(long) setInstant(instant.getTime())}.
1131 *
1132 * @param instant a {@code Date} representing a millisecond offset from
1133 * the Epoch
1134 * @return this {@code Calendar.Builder}
1135 * @throws NullPointerException if {@code instant} is {@code null}
1136 * @throws IllegalStateException if any of the field parameters have
1137 * already been set
1138 * @see Calendar#setTime(Date)
1139 * @see Calendar#setTimeInMillis(long)
1140 * @see Calendar#time
1141 */
1142 public Builder setInstant(Date instant) {
1143 return setInstant(instant.getTime()); // NPE if instant == null
1144 }
1145
1146 /**
1147 * Sets the {@code field} parameter to the given {@code value}.
1148 * {@code field} is an index to the {@link Calendar#fields}, such as
1149 * {@link Calendar#DAY_OF_MONTH DAY_OF_MONTH}. Field value validation is
1150 * not performed in this method. Any out of range values are either
1151 * normalized in lenient mode or detected as an invalid value in
1152 * non-lenient mode when building a {@code Calendar}.
1153 *
1154 * @param field an index to the {@code Calendar} fields
1155 * @param value the field value
1156 * @return this {@code Calendar.Builder}
1157 * @throws IllegalArgumentException if {@code field} is invalid
1158 * @throws IllegalStateException if the instant value has already been set,
1159 * or if fields have been set too many
1160 * (approximately {@link Integer#MAX_VALUE}) times.
1161 * @see Calendar#set(int, int)
1162 */
1163 public Builder set(int field, int value) {
1164 // Note: WEEK_YEAR can't be set with this method.
1165 if (field < 0 || field >= FIELD_COUNT) {
1166 throw new IllegalArgumentException("field is invalid");
1167 }
1168 if (isInstantSet()) {
1169 throw new IllegalStateException("instant has been set");
1170 }
1171 allocateFields();
1172 internalSet(field, value);
1173 return this;
1174 }
1175
1176 /**
1177 * Sets field parameters to their values given by
1178 * {@code fieldValuePairs} that are pairs of a field and its value.
1179 * For example,
1180 * <pre>
1181 * setFields(Calendar.YEAR, 2013,
1182 * Calendar.MONTH, Calendar.DECEMBER,
1183 * Calendar.DAY_OF_MONTH, 23);</pre>
1184 * is equivalent to the sequence of the following
1185 * {@link #set(int, int) set} calls:
1186 * <pre>
1187 * set(Calendar.YEAR, 2013)
1188 * .set(Calendar.MONTH, Calendar.DECEMBER)
1189 * .set(Calendar.DAY_OF_MONTH, 23);</pre>
1190 *
1191 * @param fieldValuePairs field-value pairs
1192 * @return this {@code Calendar.Builder}
1193 * @throws NullPointerException if {@code fieldValuePairs} is {@code null}
1194 * @throws IllegalArgumentException if any of fields are invalid,
1195 * or if {@code fieldValuePairs.length} is an odd number.
1196 * @throws IllegalStateException if the instant value has been set,
1197 * or if fields have been set too many (approximately
1198 * {@link Integer#MAX_VALUE}) times.
1199 */
1200 public Builder setFields(int... fieldValuePairs) {
1201 int len = fieldValuePairs.length;
1202 if ((len % 2) != 0) {
1203 throw new IllegalArgumentException();
1204 }
1205 if (isInstantSet()) {
1206 throw new IllegalStateException("instant has been set");
1207 }
1208 if ((nextStamp + len / 2) < 0) {
1209 throw new IllegalStateException("stamp counter overflow");
1210 }
1211 allocateFields();
1212 for (int i = 0; i < len; ) {
1213 int field = fieldValuePairs[i++];
1214 // Note: WEEK_YEAR can't be set with this method.
1215 if (field < 0 || field >= FIELD_COUNT) {
1216 throw new IllegalArgumentException("field is invalid");
1217 }
1218 internalSet(field, fieldValuePairs[i++]);
1219 }
1220 return this;
1221 }
1222
1223 /**
1224 * Sets the date field parameters to the values given by {@code year},
1225 * {@code month}, and {@code dayOfMonth}. This method is equivalent to
1226 * a call to:
1227 * <pre>
1228 * setFields(Calendar.YEAR, year,
1229 * Calendar.MONTH, month,
1230 * Calendar.DAY_OF_MONTH, dayOfMonth);</pre>
1231 *
1232 * @param year the {@link Calendar#YEAR YEAR} value
1233 * @param month the {@link Calendar#MONTH MONTH} value
1234 * (the month numbering is <em>0-based</em>).
1235 * @param dayOfMonth the {@link Calendar#DAY_OF_MONTH DAY_OF_MONTH} value
1236 * @return this {@code Calendar.Builder}
1237 */
1238 public Builder setDate(int year, int month, int dayOfMonth) {
1239 return setFields(YEAR, year, MONTH, month, DAY_OF_MONTH, dayOfMonth);
1240 }
1241
1242 /**
1243 * Sets the time of day field parameters to the values given by
1244 * {@code hourOfDay}, {@code minute}, and {@code second}. This method is
1245 * equivalent to a call to:
1246 * <pre>
1247 * setTimeOfDay(hourOfDay, minute, second, 0);</pre>
1248 *
1249 * @param hourOfDay the {@link Calendar#HOUR_OF_DAY HOUR_OF_DAY} value
1250 * (24-hour clock)
1251 * @param minute the {@link Calendar#MINUTE MINUTE} value
1252 * @param second the {@link Calendar#SECOND SECOND} value
1253 * @return this {@code Calendar.Builder}
1254 */
1255 public Builder setTimeOfDay(int hourOfDay, int minute, int second) {
1256 return setTimeOfDay(hourOfDay, minute, second, 0);
1257 }
1258
1259 /**
1260 * Sets the time of day field parameters to the values given by
1261 * {@code hourOfDay}, {@code minute}, {@code second}, and
1262 * {@code millis}. This method is equivalent to a call to:
1263 * <pre>
1264 * setFields(Calendar.HOUR_OF_DAY, hourOfDay,
1265 * Calendar.MINUTE, minute,
1266 * Calendar.SECOND, second,
1267 * Calendar.MILLISECOND, millis);</pre>
1268 *
1269 * @param hourOfDay the {@link Calendar#HOUR_OF_DAY HOUR_OF_DAY} value
1270 * (24-hour clock)
1271 * @param minute the {@link Calendar#MINUTE MINUTE} value
1272 * @param second the {@link Calendar#SECOND SECOND} value
1273 * @param millis the {@link Calendar#MILLISECOND MILLISECOND} value
1274 * @return this {@code Calendar.Builder}
1275 */
1276 public Builder setTimeOfDay(int hourOfDay, int minute, int second, int millis) {
1277 return setFields(HOUR_OF_DAY, hourOfDay, MINUTE, minute,
1278 SECOND, second, MILLISECOND, millis);
1279 }
1280
1281 /**
1282 * Sets the week-based date parameters to the values with the given
1283 * date specifiers - week year, week of year, and day of week.
1284 *
1285 * <p>If the specified calendar doesn't support week dates, the
1286 * {@link #build() build} method will throw an {@link IllegalArgumentException}.
1287 *
1288 * @param weekYear the week year
1289 * @param weekOfYear the week number based on {@code weekYear}
1290 * @param dayOfWeek the day of week value: one of the constants
1291 * for the {@link Calendar#DAY_OF_WEEK DAY_OF_WEEK} field:
1292 * {@link Calendar#SUNDAY SUNDAY}, ..., {@link Calendar#SATURDAY SATURDAY}.
1293 * @return this {@code Calendar.Builder}
1294 * @see Calendar#setWeekDate(int, int, int)
1295 * @see Calendar#isWeekDateSupported()
1296 */
1297 public Builder setWeekDate(int weekYear, int weekOfYear, int dayOfWeek) {
1298 allocateFields();
1299 internalSet(WEEK_YEAR, weekYear);
1300 internalSet(WEEK_OF_YEAR, weekOfYear);
1301 internalSet(DAY_OF_WEEK, dayOfWeek);
1302 return this;
1303 }
1304
1305 /**
1306 * Sets the time zone parameter to the given {@code zone}. If no time
1307 * zone parameter is given to this {@code Calendar.Builder}, the
1308 * {@linkplain TimeZone#getDefault() default
1309 * <code>TimeZone</code>} will be used in the {@link #build() build}
1310 * method.
1311 *
1312 * @param zone the {@link TimeZone}
1313 * @return this {@code Calendar.Builder}
1314 * @throws NullPointerException if {@code zone} is {@code null}
1315 * @see Calendar#setTimeZone(TimeZone)
1316 */
1317 public Builder setTimeZone(TimeZone zone) {
1318 if (zone == null) {
1319 throw new NullPointerException();
1320 }
1321 this.zone = zone;
1322 return this;
1323 }
1324
1325 /**
1326 * Sets the lenient mode parameter to the value given by {@code lenient}.
1327 * If no lenient parameter is given to this {@code Calendar.Builder},
1328 * lenient mode will be used in the {@link #build() build} method.
1329 *
1330 * @param lenient {@code true} for lenient mode;
1331 * {@code false} for non-lenient mode
1332 * @return this {@code Calendar.Builder}
1333 * @see Calendar#setLenient(boolean)
1334 */
1335 public Builder setLenient(boolean lenient) {
1336 this.lenient = lenient;
1337 return this;
1338 }
1339
1340 /**
1341 * Sets the calendar type parameter to the given {@code type}. The
1342 * calendar type given by this method has precedence over any explicit
1343 * or implicit calendar type given by the
1344 * {@linkplain #setLocale(Locale) locale}.
1345 *
1346 * <p>In addition to the available calendar types returned by the
1347 * {@link Calendar#getAvailableCalendarTypes() Calendar.getAvailableCalendarTypes}
1348 * method, {@code "gregorian"} and {@code "iso8601"} as aliases of
1349 * {@code "gregory"} can be used with this method.
1350 *
1351 * @param type the calendar type
1352 * @return this {@code Calendar.Builder}
1353 * @throws NullPointerException if {@code type} is {@code null}
1354 * @throws IllegalArgumentException if {@code type} is unknown
1355 * @throws IllegalStateException if another calendar type has already been set
1356 * @see Calendar#getCalendarType()
1357 * @see Calendar#getAvailableCalendarTypes()
1358 */
1359 public Builder setCalendarType(String type) {
1360 if (type.equals("gregorian")) { // NPE if type == null
1361 type = "gregory";
1362 }
1363 if (!Calendar.getAvailableCalendarTypes().contains(type)
1364 && !type.equals("iso8601")) {
1365 throw new IllegalArgumentException("unknown calendar type: " + type);
1366 }
1367 if (this.type == null) {
1368 this.type = type;
1369 } else {
1370 if (!this.type.equals(type)) {
1371 throw new IllegalStateException("calendar type override");
1372 }
1373 }
1374 return this;
1375 }
1376
1377 /**
1378 * Sets the locale parameter to the given {@code locale}. If no locale
1379 * is given to this {@code Calendar.Builder}, the {@linkplain
1380 * Locale#getDefault(Locale.Category) default <code>Locale</code>}
1381 * for {@link Locale.Category#FORMAT} will be used.
1382 *
1383 * <p>If no calendar type is explicitly given by a call to the
1384 * {@link #setCalendarType(String) setCalendarType} method,
1385 * the {@code Locale} value is used to determine what type of
1386 * {@code Calendar} to be built.
1387 *
1388 * <p>If no week definition parameters are explicitly given by a call to
1389 * the {@link #setWeekDefinition(int,int) setWeekDefinition} method, the
1390 * {@code Locale}'s default values are used.
1391 *
1392 * @param locale the {@link Locale}
1393 * @throws NullPointerException if {@code locale} is {@code null}
1394 * @return this {@code Calendar.Builder}
1395 * @see Calendar#getInstance(Locale)
1396 */
1397 public Builder setLocale(Locale locale) {
1398 if (locale == null) {
1399 throw new NullPointerException();
1400 }
1401 this.locale = locale;
1402 return this;
1403 }
1404
1405 /**
1406 * Sets the week definition parameters to the values given by
1407 * {@code firstDayOfWeek} and {@code minimalDaysInFirstWeek} that are
1408 * used to determine the <a href="Calendar.html#first_week">first
1409 * week</a> of a year. The parameters given by this method have
1410 * precedence over the default values given by the
1411 * {@linkplain #setLocale(Locale) locale}.
1412 *
1413 * @param firstDayOfWeek the first day of a week; one of
1414 * {@link Calendar#SUNDAY} to {@link Calendar#SATURDAY}
1415 * @param minimalDaysInFirstWeek the minimal number of days in the first
1416 * week (1..7)
1417 * @return this {@code Calendar.Builder}
1418 * @throws IllegalArgumentException if {@code firstDayOfWeek} or
1419 * {@code minimalDaysInFirstWeek} is invalid
1420 * @see Calendar#getFirstDayOfWeek()
1421 * @see Calendar#getMinimalDaysInFirstWeek()
1422 */
1423 public Builder setWeekDefinition(int firstDayOfWeek, int minimalDaysInFirstWeek) {
1424 if (!isValidWeekParameter(firstDayOfWeek)
1425 || !isValidWeekParameter(minimalDaysInFirstWeek)) {
1426 throw new IllegalArgumentException();
1427 }
1428 this.firstDayOfWeek = firstDayOfWeek;
1429 this.minimalDaysInFirstWeek = minimalDaysInFirstWeek;
1430 return this;
1431 }
1432
1433 /**
1434 * Returns a {@code Calendar} built from the parameters set by the
1435 * setter methods. The calendar type given by the {@link #setCalendarType(String)
1436 * setCalendarType} method or the {@linkplain #setLocale(Locale) locale} is
1437 * used to determine what {@code Calendar} to be created. If no explicit
1438 * calendar type is given, the locale's default calendar is created.
1439 *
1440 * <p>If the calendar type is {@code "iso8601"}, the
1441 * {@linkplain GregorianCalendar#setGregorianChange(Date) Gregorian change date}
1442 * of a {@link GregorianCalendar} is set to {@code Date(Long.MIN_VALUE)}
1443 * to be the <em>proleptic</em> Gregorian calendar. Its week definition
1444 * parameters are also set to be <a
1445 * href="GregorianCalendar.html#iso8601_compatible_setting">compatible
1446 * with the ISO 8601 standard</a>. Note that the
1447 * {@link GregorianCalendar#getCalendarType() getCalendarType} method of
1448 * a {@code GregorianCalendar} created with {@code "iso8601"} returns
1449 * {@code "gregory"}.
1450 *
1451 * <p>The default values are used for locale and time zone if these
1452 * parameters haven't been given explicitly.
1453 * <p>
1454 * If the locale contains the time zone with "tz"
1455 * <a href="Locale.html#def_locale_extension">Unicode extension</a>,
1456 * and time zone hasn't been given explicitly, time zone in the locale
1457 * is used.
1458 *
1459 * <p>Any out of range field values are either normalized in lenient
1460 * mode or detected as an invalid value in non-lenient mode.
1461 *
1462 * @return a {@code Calendar} built with parameters of this {@code
1463 * Calendar.Builder}
1464 * @throws IllegalArgumentException if the calendar type is unknown, or
1465 * if any invalid field values are given in non-lenient mode, or
1466 * if a week date is given for the calendar type that doesn't
1467 * support week dates.
1468 * @see Calendar#getInstance(TimeZone, Locale)
1469 * @see Locale#getDefault(Locale.Category)
1470 * @see TimeZone#getDefault()
1471 */
1472 public Calendar build() {
1473 if (locale == null) {
1474 locale = Locale.getDefault();
1475 }
1476 if (zone == null) {
1477 zone = defaultTimeZone(locale);
1478 }
1479 Calendar cal;
1480 if (type == null) {
1481 type = locale.getUnicodeLocaleType("ca");
1482 }
1483 if (type == null) {
1484 if (locale.getCountry() == "TH"
1485 && locale.getLanguage() == "th") {
1486 type = "buddhist";
1487 } else {
1488 type = "gregory";
1489 }
1490 }
1491 switch (type) {
1492 case "gregory":
1493 cal = new GregorianCalendar(zone, locale, true);
1494 break;
1495 case "iso8601":
1496 GregorianCalendar gcal = new GregorianCalendar(zone, locale, true);
1497 // make gcal a proleptic Gregorian
1498 gcal.setGregorianChange(new Date(Long.MIN_VALUE));
1499 // and week definition to be compatible with ISO 8601
1500 setWeekDefinition(MONDAY, 4);
1501 cal = gcal;
1502 break;
1503 case "buddhist":
1504 cal = new BuddhistCalendar(zone, locale);
1505 cal.clear();
1506 break;
1507 case "japanese":
1508 cal = new JapaneseImperialCalendar(zone, locale, true);
1509 break;
1510 default:
1511 throw new IllegalArgumentException("unknown calendar type: " + type);
1512 }
1513 cal.setLenient(lenient);
1514 if (firstDayOfWeek != 0) {
1515 cal.setFirstDayOfWeek(firstDayOfWeek);
1516 cal.setMinimalDaysInFirstWeek(minimalDaysInFirstWeek);
1517 }
1518 if (isInstantSet()) {
1519 cal.setTimeInMillis(instant);
1520 cal.complete();
1521 return cal;
1522 }
1523
1524 if (fields != null) {
1525 boolean weekDate = isSet(WEEK_YEAR)
1526 && fields[WEEK_YEAR] > fields[YEAR];
1527 if (weekDate && !cal.isWeekDateSupported()) {
1528 throw new IllegalArgumentException("week date is unsupported by " + type);
1529 }
1530
1531 // Set the fields from the min stamp to the max stamp so that
1532 // the fields resolution works in the Calendar.
1533 for (int stamp = MINIMUM_USER_STAMP; stamp < nextStamp; stamp++) {
1534 for (int index = 0; index <= maxFieldIndex; index++) {
1535 if (fields[index] == stamp) {
1536 cal.set(index, fields[NFIELDS + index]);
1537 break;
1538 }
1539 }
1540 }
1541
1542 if (weekDate) {
1543 int weekOfYear = isSet(WEEK_OF_YEAR) ? fields[NFIELDS + WEEK_OF_YEAR] : 1;
1544 int dayOfWeek = isSet(DAY_OF_WEEK)
1545 ? fields[NFIELDS + DAY_OF_WEEK] : cal.getFirstDayOfWeek();
1546 cal.setWeekDate(fields[NFIELDS + WEEK_YEAR], weekOfYear, dayOfWeek);
1547 }
1548 cal.complete();
1549 }
1550
1551 return cal;
1552 }
1553
1554 private void allocateFields() {
1555 if (fields == null) {
1556 fields = new int[NFIELDS * 2];
1557 nextStamp = MINIMUM_USER_STAMP;
1558 maxFieldIndex = -1;
1559 }
1560 }
1561
1562 private void internalSet(int field, int value) {
1563 fields[field] = nextStamp++;
1564 if (nextStamp < 0) {
1565 throw new IllegalStateException("stamp counter overflow");
1566 }
1567 fields[NFIELDS + field] = value;
1568 if (field > maxFieldIndex && field < WEEK_YEAR) {
1569 maxFieldIndex = field;
1570 }
1571 }
1572
1573 private boolean isInstantSet() {
1574 return nextStamp == COMPUTED;
1575 }
1576
1577 private boolean isSet(int index) {
1578 return fields != null && fields[index] > UNSET;
1579 }
1580
1581 private boolean isValidWeekParameter(int value) {
1582 return value > 0 && value <= 7;
1583 }
1584 }
1585
1586 /**
1587 * Constructs a Calendar with the default time zone
1588 * and the default {@link java.util.Locale.Category#FORMAT FORMAT}
1589 * locale.
1590 * @see TimeZone#getDefault
1591 */
1592 protected Calendar()
1593 {
1594 this(TimeZone.getDefaultRef(), Locale.getDefault(Locale.Category.FORMAT));
1595 sharedZone = true;
1596 }
1597
1598 /**
1599 * Constructs a calendar with the specified time zone and locale.
1600 *
1601 * @param zone the time zone to use
1602 * @param aLocale the locale for the week data
1603 */
1604 protected Calendar(TimeZone zone, Locale aLocale)
1605 {
1606 fields = new int[FIELD_COUNT];
1607 isSet = new boolean[FIELD_COUNT];
1608 stamp = new int[FIELD_COUNT];
1609
1610 this.zone = zone;
1611 setWeekCountData(aLocale);
1612 }
1613
1614 /**
1615 * Gets a calendar using the default time zone and locale. The
1616 * <code>Calendar</code> returned is based on the current time
1617 * in the default time zone with the default
1618 * {@link Locale.Category#FORMAT FORMAT} locale.
1619 * <p>
1620 * If the locale contains the time zone with "tz"
1621 * <a href="Locale.html#def_locale_extension">Unicode extension</a>,
1622 * that time zone is used instead.
1623 *
1624 * @return a Calendar.
1625 */
1626 public static Calendar getInstance()
1627 {
1628 Locale aLocale = Locale.getDefault(Locale.Category.FORMAT);
1629 return createCalendar(defaultTimeZone(aLocale), aLocale);
1630 }
1631
1632 /**
1633 * Gets a calendar using the specified time zone and default locale.
1634 * The <code>Calendar</code> returned is based on the current time
1635 * in the given time zone with the default
1636 * {@link Locale.Category#FORMAT FORMAT} locale.
1637 *
1638 * @param zone the time zone to use
1639 * @return a Calendar.
1640 */
1641 public static Calendar getInstance(TimeZone zone)
1642 {
1643 return createCalendar(zone, Locale.getDefault(Locale.Category.FORMAT));
1644 }
1645
1646 /**
1647 * Gets a calendar using the default time zone and specified locale.
1648 * The <code>Calendar</code> returned is based on the current time
1649 * in the default time zone with the given locale.
1650 * <p>
1651 * If the locale contains the time zone with "tz"
1652 * <a href="Locale.html#def_locale_extension">Unicode extension</a>,
1653 * that time zone is used instead.
1654 *
1655 * @param aLocale the locale for the week data
1656 * @return a Calendar.
1657 */
1658 public static Calendar getInstance(Locale aLocale)
1659 {
1660 return createCalendar(defaultTimeZone(aLocale), aLocale);
1661 }
1662
1663 /**
1664 * Gets a calendar with the specified time zone and locale.
1665 * The <code>Calendar</code> returned is based on the current time
1666 * in the given time zone with the given locale.
1667 *
1668 * @param zone the time zone to use
1669 * @param aLocale the locale for the week data
1670 * @return a Calendar.
1671 */
1672 public static Calendar getInstance(TimeZone zone,
1673 Locale aLocale)
1674 {
1675 return createCalendar(zone, aLocale);
1676 }
1677
1678 private static TimeZone defaultTimeZone(Locale l) {
1679 TimeZone defaultTZ = TimeZone.getDefault();
1680 String shortTZID = l.getUnicodeLocaleType("tz");
1681 return shortTZID != null ?
1682 TimeZoneNameUtility.convertLDMLShortID(shortTZID)
1683 .map(TimeZone::getTimeZone)
1684 .orElse(defaultTZ) :
1685 defaultTZ;
1686 }
1687
1688 private static Calendar createCalendar(TimeZone zone,
1689 Locale aLocale)
1690 {
1691 CalendarProvider provider =
1692 LocaleProviderAdapter.getAdapter(CalendarProvider.class, aLocale)
1693 .getCalendarProvider();
1694 if (provider != null) {
1695 try {
1696 return provider.getInstance(zone, aLocale);
1697 } catch (IllegalArgumentException iae) {
1698 // fall back to the default instantiation
1699 }
1700 }
1701
1702 Calendar cal = null;
1703
1704 if (aLocale.hasExtensions()) {
1705 String caltype = aLocale.getUnicodeLocaleType("ca");
1706 if (caltype != null) {
1707 switch (caltype) {
1708 case "buddhist":
1709 cal = new BuddhistCalendar(zone, aLocale);
1710 break;
1711 case "japanese":
1712 cal = new JapaneseImperialCalendar(zone, aLocale);
1713 break;
1714 case "gregory":
1715 cal = new GregorianCalendar(zone, aLocale);
1716 break;
1717 }
1718 }
1719 }
1720 if (cal == null) {
1721 // If no known calendar type is explicitly specified,
1722 // perform the traditional way to create a Calendar:
1723 // create a BuddhistCalendar for th_TH locale,
1724 // a JapaneseImperialCalendar for ja_JP_JP locale, or
1725 // a GregorianCalendar for any other locales.
1726 // NOTE: The language, country and variant strings are interned.
1727 if (aLocale.getLanguage() == "th" && aLocale.getCountry() == "TH") {
1728 cal = new BuddhistCalendar(zone, aLocale);
1729 } else if (aLocale.getVariant() == "JP" && aLocale.getLanguage() == "ja"
1730 && aLocale.getCountry() == "JP") {
1731 cal = new JapaneseImperialCalendar(zone, aLocale);
1732 } else {
1733 cal = new GregorianCalendar(zone, aLocale);
1734 }
1735 }
1736 return cal;
1737 }
1738
1739 /**
1740 * Returns an array of all locales for which the <code>getInstance</code>
1741 * methods of this class can return localized instances.
1742 * The array returned must contain at least a <code>Locale</code>
1743 * instance equal to {@link java.util.Locale#US Locale.US}.
1744 *
1745 * @return An array of locales for which localized
1746 * <code>Calendar</code> instances are available.
1747 */
1748 public static synchronized Locale[] getAvailableLocales()
1749 {
1750 return DateFormat.getAvailableLocales();
1751 }
1752
1753 /**
1754 * Converts the current calendar field values in {@link #fields fields[]}
1755 * to the millisecond time value
1756 * {@link #time}.
1757 *
1758 * @see #complete()
1759 * @see #computeFields()
1760 */
1761 protected abstract void computeTime();
1762
1763 /**
1764 * Converts the current millisecond time value {@link #time}
1765 * to calendar field values in {@link #fields fields[]}.
1766 * This allows you to sync up the calendar field values with
1767 * a new time that is set for the calendar. The time is <em>not</em>
1768 * recomputed first; to recompute the time, then the fields, call the
1769 * {@link #complete()} method.
1770 *
1771 * @see #computeTime()
1772 */
1773 protected abstract void computeFields();
1774
1775 /**
1776 * Returns a <code>Date</code> object representing this
1777 * <code>Calendar</code>'s time value (millisecond offset from the <a
1778 * href="#Epoch">Epoch</a>").
1779 *
1780 * @return a <code>Date</code> representing the time value.
1781 * @see #setTime(Date)
1782 * @see #getTimeInMillis()
1783 */
1784 public final Date getTime() {
1785 return new Date(getTimeInMillis());
1786 }
1787
1788 /**
1789 * Sets this Calendar's time with the given <code>Date</code>.
1790 * <p>
1791 * Note: Calling <code>setTime()</code> with
1792 * <code>Date(Long.MAX_VALUE)</code> or <code>Date(Long.MIN_VALUE)</code>
1793 * may yield incorrect field values from <code>get()</code>.
1794 *
1795 * @param date the given Date.
1796 * @see #getTime()
1797 * @see #setTimeInMillis(long)
1798 */
1799 public final void setTime(Date date) {
1800 setTimeInMillis(date.getTime());
1801 }
1802
1803 /**
1804 * Returns this Calendar's time value in milliseconds.
1805 *
1806 * @return the current time as UTC milliseconds from the epoch.
1807 * @see #getTime()
1808 * @see #setTimeInMillis(long)
1809 */
1810 public long getTimeInMillis() {
1811 if (!isTimeSet) {
1812 updateTime();
1813 }
1814 return time;
1815 }
1816
1817 /**
1818 * Sets this Calendar's current time from the given long value.
1819 *
1820 * @param millis the new time in UTC milliseconds from the epoch.
1821 * @see #setTime(Date)
1822 * @see #getTimeInMillis()
1823 */
1824 public void setTimeInMillis(long millis) {
1825 // If we don't need to recalculate the calendar field values,
1826 // do nothing.
1827 if (time == millis && isTimeSet && areFieldsSet && areAllFieldsSet
1828 && (zone instanceof ZoneInfo) && !((ZoneInfo)zone).isDirty()) {
1829 return;
1830 }
1831 time = millis;
1832 isTimeSet = true;
1833 areFieldsSet = false;
1834 computeFields();
1835 areAllFieldsSet = areFieldsSet = true;
1836 }
1837
1838 /**
1839 * Returns the value of the given calendar field. In lenient mode,
1840 * all calendar fields are normalized. In non-lenient mode, all
1841 * calendar fields are validated and this method throws an
1842 * exception if any calendar fields have out-of-range values. The
1843 * normalization and validation are handled by the
1844 * {@link #complete()} method, which process is calendar
1845 * system dependent.
1846 *
1847 * @param field the given calendar field.
1848 * @return the value for the given calendar field.
1849 * @throws ArrayIndexOutOfBoundsException if the specified field is out of range
1850 * (<code>field < 0 || field >= FIELD_COUNT</code>).
1851 * @see #set(int,int)
1852 * @see #complete()
1853 */
1854 public int get(int field)
1855 {
1856 complete();
1857 return internalGet(field);
1858 }
1859
1860 /**
1861 * Returns the value of the given calendar field. This method does
1862 * not involve normalization or validation of the field value.
1863 *
1864 * @param field the given calendar field.
1865 * @return the value for the given calendar field.
1866 * @see #get(int)
1867 */
1868 protected final int internalGet(int field)
1869 {
1870 return fields[field];
1871 }
1872
1873 /**
1874 * Sets the value of the given calendar field. This method does
1875 * not affect any setting state of the field in this
1876 * <code>Calendar</code> instance.
1877 *
1878 * @throws IndexOutOfBoundsException if the specified field is out of range
1879 * (<code>field < 0 || field >= FIELD_COUNT</code>).
1880 * @see #areFieldsSet
1881 * @see #isTimeSet
1882 * @see #areAllFieldsSet
1883 * @see #set(int,int)
1884 */
1885 final void internalSet(int field, int value)
1886 {
1887 fields[field] = value;
1888 }
1889
1890 /**
1891 * Sets the given calendar field to the given value. The value is not
1892 * interpreted by this method regardless of the leniency mode.
1893 *
1894 * @param field the given calendar field.
1895 * @param value the value to be set for the given calendar field.
1896 * @throws ArrayIndexOutOfBoundsException if the specified field is out of range
1897 * (<code>field < 0 || field >= FIELD_COUNT</code>).
1898 * in non-lenient mode.
1899 * @see #set(int,int,int)
1900 * @see #set(int,int,int,int,int)
1901 * @see #set(int,int,int,int,int,int)
1902 * @see #get(int)
1903 */
1904 public void set(int field, int value)
1905 {
1906 // If the fields are partially normalized, calculate all the
1907 // fields before changing any fields.
1908 if (areFieldsSet && !areAllFieldsSet) {
1909 computeFields();
1910 }
1911 internalSet(field, value);
1912 isTimeSet = false;
1913 areFieldsSet = false;
1914 isSet[field] = true;
1915 stamp[field] = nextStamp++;
1916 if (nextStamp == Integer.MAX_VALUE) {
1917 adjustStamp();
1918 }
1919 }
1920
1921 /**
1922 * Sets the values for the calendar fields <code>YEAR</code>,
1923 * <code>MONTH</code>, and <code>DAY_OF_MONTH</code>.
1924 * Previous values of other calendar fields are retained. If this is not desired,
1925 * call {@link #clear()} first.
1926 *
1927 * @param year the value used to set the <code>YEAR</code> calendar field.
1928 * @param month the value used to set the <code>MONTH</code> calendar field.
1929 * Month value is 0-based. e.g., 0 for January.
1930 * @param date the value used to set the <code>DAY_OF_MONTH</code> calendar field.
1931 * @see #set(int,int)
1932 * @see #set(int,int,int,int,int)
1933 * @see #set(int,int,int,int,int,int)
1934 */
1935 public final void set(int year, int month, int date)
1936 {
1937 set(YEAR, year);
1938 set(MONTH, month);
1939 set(DATE, date);
1940 }
1941
1942 /**
1943 * Sets the values for the calendar fields <code>YEAR</code>,
1944 * <code>MONTH</code>, <code>DAY_OF_MONTH</code>,
1945 * <code>HOUR_OF_DAY</code>, and <code>MINUTE</code>.
1946 * Previous values of other fields are retained. If this is not desired,
1947 * call {@link #clear()} first.
1948 *
1949 * @param year the value used to set the <code>YEAR</code> calendar field.
1950 * @param month the value used to set the <code>MONTH</code> calendar field.
1951 * Month value is 0-based. e.g., 0 for January.
1952 * @param date the value used to set the <code>DAY_OF_MONTH</code> calendar field.
1953 * @param hourOfDay the value used to set the <code>HOUR_OF_DAY</code> calendar field.
1954 * @param minute the value used to set the <code>MINUTE</code> calendar field.
1955 * @see #set(int,int)
1956 * @see #set(int,int,int)
1957 * @see #set(int,int,int,int,int,int)
1958 */
1959 public final void set(int year, int month, int date, int hourOfDay, int minute)
1960 {
1961 set(YEAR, year);
1962 set(MONTH, month);
1963 set(DATE, date);
1964 set(HOUR_OF_DAY, hourOfDay);
1965 set(MINUTE, minute);
1966 }
1967
1968 /**
1969 * Sets the values for the fields <code>YEAR</code>, <code>MONTH</code>,
1970 * <code>DAY_OF_MONTH</code>, <code>HOUR_OF_DAY</code>, <code>MINUTE</code>, and
1971 * <code>SECOND</code>.
1972 * Previous values of other fields are retained. If this is not desired,
1973 * call {@link #clear()} first.
1974 *
1975 * @param year the value used to set the <code>YEAR</code> calendar field.
1976 * @param month the value used to set the <code>MONTH</code> calendar field.
1977 * Month value is 0-based. e.g., 0 for January.
1978 * @param date the value used to set the <code>DAY_OF_MONTH</code> calendar field.
1979 * @param hourOfDay the value used to set the <code>HOUR_OF_DAY</code> calendar field.
1980 * @param minute the value used to set the <code>MINUTE</code> calendar field.
1981 * @param second the value used to set the <code>SECOND</code> calendar field.
1982 * @see #set(int,int)
1983 * @see #set(int,int,int)
1984 * @see #set(int,int,int,int,int)
1985 */
1986 public final void set(int year, int month, int date, int hourOfDay, int minute,
1987 int second)
1988 {
1989 set(YEAR, year);
1990 set(MONTH, month);
1991 set(DATE, date);
1992 set(HOUR_OF_DAY, hourOfDay);
1993 set(MINUTE, minute);
1994 set(SECOND, second);
1995 }
1996
1997 /**
1998 * Sets all the calendar field values and the time value
1999 * (millisecond offset from the <a href="#Epoch">Epoch</a>) of
2000 * this <code>Calendar</code> undefined. This means that {@link
2001 * #isSet(int) isSet()} will return <code>false</code> for all the
2002 * calendar fields, and the date and time calculations will treat
2003 * the fields as if they had never been set. A
2004 * <code>Calendar</code> implementation class may use its specific
2005 * default field values for date/time calculations. For example,
2006 * <code>GregorianCalendar</code> uses 1970 if the
2007 * <code>YEAR</code> field value is undefined.
2008 *
2009 * @see #clear(int)
2010 */
2011 public final void clear()
2012 {
2013 for (int i = 0; i < fields.length; ) {
2014 stamp[i] = fields[i] = 0; // UNSET == 0
2015 isSet[i++] = false;
2016 }
2017 areAllFieldsSet = areFieldsSet = false;
2018 isTimeSet = false;
2019 }
2020
2021 /**
2022 * Sets the given calendar field value and the time value
2023 * (millisecond offset from the <a href="#Epoch">Epoch</a>) of
2024 * this <code>Calendar</code> undefined. This means that {@link
2025 * #isSet(int) isSet(field)} will return <code>false</code>, and
2026 * the date and time calculations will treat the field as if it
2027 * had never been set. A <code>Calendar</code> implementation
2028 * class may use the field's specific default value for date and
2029 * time calculations.
2030 *
2031 * <p>The {@link #HOUR_OF_DAY}, {@link #HOUR} and {@link #AM_PM}
2032 * fields are handled independently and the <a
2033 * href="#time_resolution">the resolution rule for the time of
2034 * day</a> is applied. Clearing one of the fields doesn't reset
2035 * the hour of day value of this <code>Calendar</code>. Use {@link
2036 * #set(int,int) set(Calendar.HOUR_OF_DAY, 0)} to reset the hour
2037 * value.
2038 *
2039 * @param field the calendar field to be cleared.
2040 * @see #clear()
2041 */
2042 public final void clear(int field)
2043 {
2044 fields[field] = 0;
2045 stamp[field] = UNSET;
2046 isSet[field] = false;
2047
2048 areAllFieldsSet = areFieldsSet = false;
2049 isTimeSet = false;
2050 }
2051
2052 /**
2053 * Determines if the given calendar field has a value set,
2054 * including cases that the value has been set by internal fields
2055 * calculations triggered by a <code>get</code> method call.
2056 *
2057 * @param field the calendar field to test
2058 * @return <code>true</code> if the given calendar field has a value set;
2059 * <code>false</code> otherwise.
2060 */
2061 public final boolean isSet(int field)
2062 {
2063 return stamp[field] != UNSET;
2064 }
2065
2066 /**
2067 * Returns the string representation of the calendar
2068 * <code>field</code> value in the given <code>style</code> and
2069 * <code>locale</code>. If no string representation is
2070 * applicable, <code>null</code> is returned. This method calls
2071 * {@link Calendar#get(int) get(field)} to get the calendar
2072 * <code>field</code> value if the string representation is
2073 * applicable to the given calendar <code>field</code>.
2074 *
2075 * <p>For example, if this <code>Calendar</code> is a
2076 * <code>GregorianCalendar</code> and its date is 2005-01-01, then
2077 * the string representation of the {@link #MONTH} field would be
2078 * "January" in the long style in an English locale or "Jan" in
2079 * the short style. However, no string representation would be
2080 * available for the {@link #DAY_OF_MONTH} field, and this method
2081 * would return <code>null</code>.
2082 *
2083 * <p>The default implementation supports the calendar fields for
2084 * which a {@link DateFormatSymbols} has names in the given
2085 * <code>locale</code>.
2086 *
2087 * @param field
2088 * the calendar field for which the string representation
2089 * is returned
2090 * @param style
2091 * the style applied to the string representation; one of {@link
2092 * #SHORT_FORMAT} ({@link #SHORT}), {@link #SHORT_STANDALONE},
2093 * {@link #LONG_FORMAT} ({@link #LONG}), {@link #LONG_STANDALONE},
2094 * {@link #NARROW_FORMAT}, or {@link #NARROW_STANDALONE}.
2095 * @param locale
2096 * the locale for the string representation
2097 * (any calendar types specified by {@code locale} are ignored)
2098 * @return the string representation of the given
2099 * {@code field} in the given {@code style}, or
2100 * {@code null} if no string representation is
2101 * applicable.
2102 * @exception IllegalArgumentException
2103 * if {@code field} or {@code style} is invalid,
2104 * or if this {@code Calendar} is non-lenient and any
2105 * of the calendar fields have invalid values
2106 * @exception NullPointerException
2107 * if {@code locale} is null
2108 * @since 1.6
2109 */
2110 public String getDisplayName(int field, int style, Locale locale) {
2111 if (!checkDisplayNameParams(field, style, SHORT, NARROW_FORMAT, locale,
2112 ERA_MASK|MONTH_MASK|DAY_OF_WEEK_MASK|AM_PM_MASK)) {
2113 return null;
2114 }
2115
2116 String calendarType = getCalendarType();
2117 int fieldValue = get(field);
2118 // the standalone/narrow styles and short era are supported only through
2119 // CalendarNameProviders.
2120 if (isStandaloneStyle(style) || isNarrowFormatStyle(style) ||
2121 field == ERA && (style & SHORT) == SHORT) {
2122 String val = CalendarDataUtility.retrieveFieldValueName(calendarType,
2123 field, fieldValue,
2124 style, locale);
2125 // Perform fallback here to follow the CLDR rules
2126 if (val == null) {
2127 if (isNarrowFormatStyle(style)) {
2128 val = CalendarDataUtility.retrieveFieldValueName(calendarType,
2129 field, fieldValue,
2130 toStandaloneStyle(style),
2131 locale);
2132 } else if (isStandaloneStyle(style)) {
2133 val = CalendarDataUtility.retrieveFieldValueName(calendarType,
2134 field, fieldValue,
2135 getBaseStyle(style),
2136 locale);
2137 }
2138 }
2139 return val;
2140 }
2141
2142 DateFormatSymbols symbols = DateFormatSymbols.getInstance(locale);
2143 String[] strings = getFieldStrings(field, style, symbols);
2144 if (strings != null) {
2145 if (fieldValue < strings.length) {
2146 return strings[fieldValue];
2147 }
2148 }
2149 return null;
2150 }
2151
2152 /**
2153 * Returns a {@code Map} containing all names of the calendar
2154 * {@code field} in the given {@code style} and
2155 * {@code locale} and their corresponding field values. For
2156 * example, if this {@code Calendar} is a {@link
2157 * GregorianCalendar}, the returned map would contain "Jan" to
2158 * {@link #JANUARY}, "Feb" to {@link #FEBRUARY}, and so on, in the
2159 * {@linkplain #SHORT short} style in an English locale.
2160 *
2161 * <p>Narrow names may not be unique due to use of single characters,
2162 * such as "S" for Sunday and Saturday. In that case narrow names are not
2163 * included in the returned {@code Map}.
2164 *
2165 * <p>The values of other calendar fields may be taken into
2166 * account to determine a set of display names. For example, if
2167 * this {@code Calendar} is a lunisolar calendar system and
2168 * the year value given by the {@link #YEAR} field has a leap
2169 * month, this method would return month names containing the leap
2170 * month name, and month names are mapped to their values specific
2171 * for the year.
2172 *
2173 * <p>The default implementation supports display names contained in
2174 * a {@link DateFormatSymbols}. For example, if {@code field}
2175 * is {@link #MONTH} and {@code style} is {@link
2176 * #ALL_STYLES}, this method returns a {@code Map} containing
2177 * all strings returned by {@link DateFormatSymbols#getShortMonths()}
2178 * and {@link DateFormatSymbols#getMonths()}.
2179 *
2180 * @param field
2181 * the calendar field for which the display names are returned
2182 * @param style
2183 * the style applied to the string representation; one of {@link
2184 * #SHORT_FORMAT} ({@link #SHORT}), {@link #SHORT_STANDALONE},
2185 * {@link #LONG_FORMAT} ({@link #LONG}), {@link #LONG_STANDALONE},
2186 * {@link #NARROW_FORMAT}, or {@link #NARROW_STANDALONE}
2187 * @param locale
2188 * the locale for the display names
2189 * @return a {@code Map} containing all display names in
2190 * {@code style} and {@code locale} and their
2191 * field values, or {@code null} if no display names
2192 * are defined for {@code field}
2193 * @exception IllegalArgumentException
2194 * if {@code field} or {@code style} is invalid,
2195 * or if this {@code Calendar} is non-lenient and any
2196 * of the calendar fields have invalid values
2197 * @exception NullPointerException
2198 * if {@code locale} is null
2199 * @since 1.6
2200 */
2201 public Map<String, Integer> getDisplayNames(int field, int style, Locale locale) {
2202 if (!checkDisplayNameParams(field, style, ALL_STYLES, NARROW_FORMAT, locale,
2203 ERA_MASK|MONTH_MASK|DAY_OF_WEEK_MASK|AM_PM_MASK)) {
2204 return null;
2205 }
2206
2207 String calendarType = getCalendarType();
2208 if (style == ALL_STYLES || isStandaloneStyle(style) || isNarrowFormatStyle(style)) {
2209 Map<String, Integer> map;
2210 map = CalendarDataUtility.retrieveFieldValueNames(calendarType, field, style, locale);
2211
2212 // Perform fallback here to follow the CLDR rules
2213 if (map == null) {
2214 if (isNarrowFormatStyle(style)) {
2215 map = CalendarDataUtility.retrieveFieldValueNames(calendarType, field,
2216 toStandaloneStyle(style), locale);
2217 } else if (style != ALL_STYLES) {
2218 map = CalendarDataUtility.retrieveFieldValueNames(calendarType, field,
2219 getBaseStyle(style), locale);
2220 }
2221 }
2222 return map;
2223 }
2224
2225 // SHORT or LONG
2226 return getDisplayNamesImpl(field, style, locale);
2227 }
2228
2229 private Map<String,Integer> getDisplayNamesImpl(int field, int style, Locale locale) {
2230 DateFormatSymbols symbols = DateFormatSymbols.getInstance(locale);
2231 String[] strings = getFieldStrings(field, style, symbols);
2232 if (strings != null) {
2233 Map<String,Integer> names = new HashMap<>();
2234 for (int i = 0; i < strings.length; i++) {
2235 if (strings[i].isEmpty()) {
2236 continue;
2237 }
2238 names.put(strings[i], i);
2239 }
2240 return names;
2241 }
2242 return null;
2243 }
2244
2245 boolean checkDisplayNameParams(int field, int style, int minStyle, int maxStyle,
2246 Locale locale, int fieldMask) {
2247 int baseStyle = getBaseStyle(style); // Ignore the standalone mask
2248 if (field < 0 || field >= fields.length ||
2249 baseStyle < minStyle || baseStyle > maxStyle || baseStyle == 3) {
2250 throw new IllegalArgumentException();
2251 }
2252 if (locale == null) {
2253 throw new NullPointerException();
2254 }
2255 return isFieldSet(fieldMask, field);
2256 }
2257
2258 private String[] getFieldStrings(int field, int style, DateFormatSymbols symbols) {
2259 int baseStyle = getBaseStyle(style); // ignore the standalone mask
2260
2261 // DateFormatSymbols doesn't support any narrow names.
2262 if (baseStyle == NARROW_FORMAT) {
2263 return null;
2264 }
2265
2266 String[] strings = null;
2267 switch (field) {
2268 case ERA:
2269 strings = symbols.getEras();
2270 break;
2271
2272 case MONTH:
2273 strings = (baseStyle == LONG) ? symbols.getMonths() : symbols.getShortMonths();
2274 break;
2275
2276 case DAY_OF_WEEK:
2277 strings = (baseStyle == LONG) ? symbols.getWeekdays() : symbols.getShortWeekdays();
2278 break;
2279
2280 case AM_PM:
2281 strings = symbols.getAmPmStrings();
2282 break;
2283 }
2284 return strings;
2285 }
2286
2287 /**
2288 * Fills in any unset fields in the calendar fields. First, the {@link
2289 * #computeTime()} method is called if the time value (millisecond offset
2290 * from the <a href="#Epoch">Epoch</a>) has not been calculated from
2291 * calendar field values. Then, the {@link #computeFields()} method is
2292 * called to calculate all calendar field values.
2293 */
2294 protected void complete()
2295 {
2296 if (!isTimeSet) {
2297 updateTime();
2298 }
2299 if (!areFieldsSet || !areAllFieldsSet) {
2300 computeFields(); // fills in unset fields
2301 areAllFieldsSet = areFieldsSet = true;
2302 }
2303 }
2304
2305 /**
2306 * Returns whether the value of the specified calendar field has been set
2307 * externally by calling one of the setter methods rather than by the
2308 * internal time calculation.
2309 *
2310 * @return <code>true</code> if the field has been set externally,
2311 * <code>false</code> otherwise.
2312 * @exception IndexOutOfBoundsException if the specified
2313 * <code>field</code> is out of range
2314 * (<code>field < 0 || field >= FIELD_COUNT</code>).
2315 * @see #selectFields()
2316 * @see #setFieldsComputed(int)
2317 */
2318 final boolean isExternallySet(int field) {
2319 return stamp[field] >= MINIMUM_USER_STAMP;
2320 }
2321
2322 /**
2323 * Returns a field mask (bit mask) indicating all calendar fields that
2324 * have the state of externally or internally set.
2325 *
2326 * @return a bit mask indicating set state fields
2327 */
2328 final int getSetStateFields() {
2329 int mask = 0;
2330 for (int i = 0; i < fields.length; i++) {
2331 if (stamp[i] != UNSET) {
2332 mask |= 1 << i;
2333 }
2334 }
2335 return mask;
2336 }
2337
2338 /**
2339 * Sets the state of the specified calendar fields to
2340 * <em>computed</em>. This state means that the specified calendar fields
2341 * have valid values that have been set by internal time calculation
2342 * rather than by calling one of the setter methods.
2343 *
2344 * @param fieldMask the field to be marked as computed.
2345 * @exception IndexOutOfBoundsException if the specified
2346 * <code>field</code> is out of range
2347 * (<code>field < 0 || field >= FIELD_COUNT</code>).
2348 * @see #isExternallySet(int)
2349 * @see #selectFields()
2350 */
2351 final void setFieldsComputed(int fieldMask) {
2352 if (fieldMask == ALL_FIELDS) {
2353 for (int i = 0; i < fields.length; i++) {
2354 stamp[i] = COMPUTED;
2355 isSet[i] = true;
2356 }
2357 areFieldsSet = areAllFieldsSet = true;
2358 } else {
2359 for (int i = 0; i < fields.length; i++) {
2360 if ((fieldMask & 1) == 1) {
2361 stamp[i] = COMPUTED;
2362 isSet[i] = true;
2363 } else {
2364 if (areAllFieldsSet && !isSet[i]) {
2365 areAllFieldsSet = false;
2366 }
2367 }
2368 fieldMask >>>= 1;
2369 }
2370 }
2371 }
2372
2373 /**
2374 * Sets the state of the calendar fields that are <em>not</em> specified
2375 * by <code>fieldMask</code> to <em>unset</em>. If <code>fieldMask</code>
2376 * specifies all the calendar fields, then the state of this
2377 * <code>Calendar</code> becomes that all the calendar fields are in sync
2378 * with the time value (millisecond offset from the Epoch).
2379 *
2380 * @param fieldMask the field mask indicating which calendar fields are in
2381 * sync with the time value.
2382 * @exception IndexOutOfBoundsException if the specified
2383 * <code>field</code> is out of range
2384 * (<code>field < 0 || field >= FIELD_COUNT</code>).
2385 * @see #isExternallySet(int)
2386 * @see #selectFields()
2387 */
2388 final void setFieldsNormalized(int fieldMask) {
2389 if (fieldMask != ALL_FIELDS) {
2390 for (int i = 0; i < fields.length; i++) {
2391 if ((fieldMask & 1) == 0) {
2392 stamp[i] = fields[i] = 0; // UNSET == 0
2393 isSet[i] = false;
2394 }
2395 fieldMask >>= 1;
2396 }
2397 }
2398
2399 // Some or all of the fields are in sync with the
2400 // milliseconds, but the stamp values are not normalized yet.
2401 areFieldsSet = true;
2402 areAllFieldsSet = false;
2403 }
2404
2405 /**
2406 * Returns whether the calendar fields are partially in sync with the time
2407 * value or fully in sync but not stamp values are not normalized yet.
2408 */
2409 final boolean isPartiallyNormalized() {
2410 return areFieldsSet && !areAllFieldsSet;
2411 }
2412
2413 /**
2414 * Returns whether the calendar fields are fully in sync with the time
2415 * value.
2416 */
2417 final boolean isFullyNormalized() {
2418 return areFieldsSet && areAllFieldsSet;
2419 }
2420
2421 /**
2422 * Marks this Calendar as not sync'd.
2423 */
2424 final void setUnnormalized() {
2425 areFieldsSet = areAllFieldsSet = false;
2426 }
2427
2428 /**
2429 * Returns whether the specified <code>field</code> is on in the
2430 * <code>fieldMask</code>.
2431 */
2432 static boolean isFieldSet(int fieldMask, int field) {
2433 return (fieldMask & (1 << field)) != 0;
2434 }
2435
2436 /**
2437 * Returns a field mask indicating which calendar field values
2438 * to be used to calculate the time value. The calendar fields are
2439 * returned as a bit mask, each bit of which corresponds to a field, i.e.,
2440 * the mask value of <code>field</code> is <code>(1 <<
2441 * field)</code>. For example, 0x26 represents the <code>YEAR</code>,
2442 * <code>MONTH</code>, and <code>DAY_OF_MONTH</code> fields (i.e., 0x26 is
2443 * equal to
2444 * <code>(1<<YEAR)|(1<<MONTH)|(1<<DAY_OF_MONTH))</code>.
2445 *
2446 * <p>This method supports the calendar fields resolution as described in
2447 * the class description. If the bit mask for a given field is on and its
2448 * field has not been set (i.e., <code>isSet(field)</code> is
2449 * <code>false</code>), then the default value of the field has to be
2450 * used, which case means that the field has been selected because the
2451 * selected combination involves the field.
2452 *
2453 * @return a bit mask of selected fields
2454 * @see #isExternallySet(int)
2455 */
2456 final int selectFields() {
2457 // This implementation has been taken from the GregorianCalendar class.
2458
2459 // The YEAR field must always be used regardless of its SET
2460 // state because YEAR is a mandatory field to determine the date
2461 // and the default value (EPOCH_YEAR) may change through the
2462 // normalization process.
2463 int fieldMask = YEAR_MASK;
2464
2465 if (stamp[ERA] != UNSET) {
2466 fieldMask |= ERA_MASK;
2467 }
2468 // Find the most recent group of fields specifying the day within
2469 // the year. These may be any of the following combinations:
2470 // MONTH + DAY_OF_MONTH
2471 // MONTH + WEEK_OF_MONTH + DAY_OF_WEEK
2472 // MONTH + DAY_OF_WEEK_IN_MONTH + DAY_OF_WEEK
2473 // DAY_OF_YEAR
2474 // WEEK_OF_YEAR + DAY_OF_WEEK
2475 // We look for the most recent of the fields in each group to determine
2476 // the age of the group. For groups involving a week-related field such
2477 // as WEEK_OF_MONTH, DAY_OF_WEEK_IN_MONTH, or WEEK_OF_YEAR, both the
2478 // week-related field and the DAY_OF_WEEK must be set for the group as a
2479 // whole to be considered. (See bug 4153860 - liu 7/24/98.)
2480 int dowStamp = stamp[DAY_OF_WEEK];
2481 int monthStamp = stamp[MONTH];
2482 int domStamp = stamp[DAY_OF_MONTH];
2483 int womStamp = aggregateStamp(stamp[WEEK_OF_MONTH], dowStamp);
2484 int dowimStamp = aggregateStamp(stamp[DAY_OF_WEEK_IN_MONTH], dowStamp);
2485 int doyStamp = stamp[DAY_OF_YEAR];
2486 int woyStamp = aggregateStamp(stamp[WEEK_OF_YEAR], dowStamp);
2487
2488 int bestStamp = domStamp;
2489 if (womStamp > bestStamp) {
2490 bestStamp = womStamp;
2491 }
2492 if (dowimStamp > bestStamp) {
2493 bestStamp = dowimStamp;
2494 }
2495 if (doyStamp > bestStamp) {
2496 bestStamp = doyStamp;
2497 }
2498 if (woyStamp > bestStamp) {
2499 bestStamp = woyStamp;
2500 }
2501
2502 /* No complete combination exists. Look for WEEK_OF_MONTH,
2503 * DAY_OF_WEEK_IN_MONTH, or WEEK_OF_YEAR alone. Treat DAY_OF_WEEK alone
2504 * as DAY_OF_WEEK_IN_MONTH.
2505 */
2506 if (bestStamp == UNSET) {
2507 womStamp = stamp[WEEK_OF_MONTH];
2508 dowimStamp = Math.max(stamp[DAY_OF_WEEK_IN_MONTH], dowStamp);
2509 woyStamp = stamp[WEEK_OF_YEAR];
2510 bestStamp = Math.max(Math.max(womStamp, dowimStamp), woyStamp);
2511
2512 /* Treat MONTH alone or no fields at all as DAY_OF_MONTH. This may
2513 * result in bestStamp = domStamp = UNSET if no fields are set,
2514 * which indicates DAY_OF_MONTH.
2515 */
2516 if (bestStamp == UNSET) {
2517 bestStamp = domStamp = monthStamp;
2518 }
2519 }
2520
2521 if (bestStamp == domStamp ||
2522 (bestStamp == womStamp && stamp[WEEK_OF_MONTH] >= stamp[WEEK_OF_YEAR]) ||
2523 (bestStamp == dowimStamp && stamp[DAY_OF_WEEK_IN_MONTH] >= stamp[WEEK_OF_YEAR])) {
2524 fieldMask |= MONTH_MASK;
2525 if (bestStamp == domStamp) {
2526 fieldMask |= DAY_OF_MONTH_MASK;
2527 } else {
2528 assert (bestStamp == womStamp || bestStamp == dowimStamp);
2529 if (dowStamp != UNSET) {
2530 fieldMask |= DAY_OF_WEEK_MASK;
2531 }
2532 if (womStamp == dowimStamp) {
2533 // When they are equal, give the priority to
2534 // WEEK_OF_MONTH for compatibility.
2535 if (stamp[WEEK_OF_MONTH] >= stamp[DAY_OF_WEEK_IN_MONTH]) {
2536 fieldMask |= WEEK_OF_MONTH_MASK;
2537 } else {
2538 fieldMask |= DAY_OF_WEEK_IN_MONTH_MASK;
2539 }
2540 } else {
2541 if (bestStamp == womStamp) {
2542 fieldMask |= WEEK_OF_MONTH_MASK;
2543 } else {
2544 assert (bestStamp == dowimStamp);
2545 if (stamp[DAY_OF_WEEK_IN_MONTH] != UNSET) {
2546 fieldMask |= DAY_OF_WEEK_IN_MONTH_MASK;
2547 }
2548 }
2549 }
2550 }
2551 } else {
2552 assert (bestStamp == doyStamp || bestStamp == woyStamp ||
2553 bestStamp == UNSET);
2554 if (bestStamp == doyStamp) {
2555 fieldMask |= DAY_OF_YEAR_MASK;
2556 } else {
2557 assert (bestStamp == woyStamp);
2558 if (dowStamp != UNSET) {
2559 fieldMask |= DAY_OF_WEEK_MASK;
2560 }
2561 fieldMask |= WEEK_OF_YEAR_MASK;
2562 }
2563 }
2564
2565 // Find the best set of fields specifying the time of day. There
2566 // are only two possibilities here; the HOUR_OF_DAY or the
2567 // AM_PM and the HOUR.
2568 int hourOfDayStamp = stamp[HOUR_OF_DAY];
2569 int hourStamp = aggregateStamp(stamp[HOUR], stamp[AM_PM]);
2570 bestStamp = (hourStamp > hourOfDayStamp) ? hourStamp : hourOfDayStamp;
2571
2572 // if bestStamp is still UNSET, then take HOUR or AM_PM. (See 4846659)
2573 if (bestStamp == UNSET) {
2574 bestStamp = Math.max(stamp[HOUR], stamp[AM_PM]);
2575 }
2576
2577 // Hours
2578 if (bestStamp != UNSET) {
2579 if (bestStamp == hourOfDayStamp) {
2580 fieldMask |= HOUR_OF_DAY_MASK;
2581 } else {
2582 fieldMask |= HOUR_MASK;
2583 if (stamp[AM_PM] != UNSET) {
2584 fieldMask |= AM_PM_MASK;
2585 }
2586 }
2587 }
2588 if (stamp[MINUTE] != UNSET) {
2589 fieldMask |= MINUTE_MASK;
2590 }
2591 if (stamp[SECOND] != UNSET) {
2592 fieldMask |= SECOND_MASK;
2593 }
2594 if (stamp[MILLISECOND] != UNSET) {
2595 fieldMask |= MILLISECOND_MASK;
2596 }
2597 if (stamp[ZONE_OFFSET] >= MINIMUM_USER_STAMP) {
2598 fieldMask |= ZONE_OFFSET_MASK;
2599 }
2600 if (stamp[DST_OFFSET] >= MINIMUM_USER_STAMP) {
2601 fieldMask |= DST_OFFSET_MASK;
2602 }
2603
2604 return fieldMask;
2605 }
2606
2607 int getBaseStyle(int style) {
2608 return style & ~STANDALONE_MASK;
2609 }
2610
2611 private int toStandaloneStyle(int style) {
2612 return style | STANDALONE_MASK;
2613 }
2614
2615 private boolean isStandaloneStyle(int style) {
2616 return (style & STANDALONE_MASK) != 0;
2617 }
2618
2619 private boolean isNarrowStyle(int style) {
2620 return style == NARROW_FORMAT || style == NARROW_STANDALONE;
2621 }
2622
2623 private boolean isNarrowFormatStyle(int style) {
2624 return style == NARROW_FORMAT;
2625 }
2626
2627 /**
2628 * Returns the pseudo-time-stamp for two fields, given their
2629 * individual pseudo-time-stamps. If either of the fields
2630 * is unset, then the aggregate is unset. Otherwise, the
2631 * aggregate is the later of the two stamps.
2632 */
2633 private static int aggregateStamp(int stamp_a, int stamp_b) {
2634 if (stamp_a == UNSET || stamp_b == UNSET) {
2635 return UNSET;
2636 }
2637 return (stamp_a > stamp_b) ? stamp_a : stamp_b;
2638 }
2639
2640 /**
2641 * Returns an unmodifiable {@code Set} containing all calendar types
2642 * supported by {@code Calendar} in the runtime environment. The available
2643 * calendar types can be used for the <a
2644 * href="Locale.html#def_locale_extension">Unicode locale extensions</a>.
2645 * The {@code Set} returned contains at least {@code "gregory"}. The
2646 * calendar types don't include aliases, such as {@code "gregorian"} for
2647 * {@code "gregory"}.
2648 *
2649 * @return an unmodifiable {@code Set} containing all available calendar types
2650 * @since 1.8
2651 * @see #getCalendarType()
2652 * @see Calendar.Builder#setCalendarType(String)
2653 * @see Locale#getUnicodeLocaleType(String)
2654 */
2655 public static Set<String> getAvailableCalendarTypes() {
2656 return AvailableCalendarTypes.SET;
2657 }
2658
2659 private static class AvailableCalendarTypes {
2660 private static final Set<String> SET;
2661 static {
2662 Set<String> set = new HashSet<>(3);
2663 set.add("gregory");
2664 set.add("buddhist");
2665 set.add("japanese");
2666 SET = Collections.unmodifiableSet(set);
2667 }
2668 private AvailableCalendarTypes() {
2669 }
2670 }
2671
2672 /**
2673 * Returns the calendar type of this {@code Calendar}. Calendar types are
2674 * defined by the <em>Unicode Locale Data Markup Language (LDML)</em>
2675 * specification.
2676 *
2677 * <p>The default implementation of this method returns the class name of
2678 * this {@code Calendar} instance. Any subclasses that implement
2679 * LDML-defined calendar systems should override this method to return
2680 * appropriate calendar types.
2681 *
2682 * @return the LDML-defined calendar type or the class name of this
2683 * {@code Calendar} instance
2684 * @since 1.8
2685 * @see <a href="Locale.html#def_extensions">Locale extensions</a>
2686 * @see Locale.Builder#setLocale(Locale)
2687 * @see Locale.Builder#setUnicodeLocaleKeyword(String, String)
2688 */
2689 public String getCalendarType() {
2690 return this.getClass().getName();
2691 }
2692
2693 /**
2694 * Compares this <code>Calendar</code> to the specified
2695 * <code>Object</code>. The result is <code>true</code> if and only if
2696 * the argument is a <code>Calendar</code> object of the same calendar
2697 * system that represents the same time value (millisecond offset from the
2698 * <a href="#Epoch">Epoch</a>) under the same
2699 * <code>Calendar</code> parameters as this object.
2700 *
2701 * <p>The <code>Calendar</code> parameters are the values represented
2702 * by the <code>isLenient</code>, <code>getFirstDayOfWeek</code>,
2703 * <code>getMinimalDaysInFirstWeek</code> and <code>getTimeZone</code>
2704 * methods. If there is any difference in those parameters
2705 * between the two <code>Calendar</code>s, this method returns
2706 * <code>false</code>.
2707 *
2708 * <p>Use the {@link #compareTo(Calendar) compareTo} method to
2709 * compare only the time values.
2710 *
2711 * @param obj the object to compare with.
2712 * @return <code>true</code> if this object is equal to <code>obj</code>;
2713 * <code>false</code> otherwise.
2714 */
2715 @SuppressWarnings("EqualsWhichDoesntCheckParameterClass")
2716 @Override
2717 public boolean equals(Object obj) {
2718 if (this == obj) {
2719 return true;
2720 }
2721 try {
2722 Calendar that = (Calendar)obj;
2723 return compareTo(getMillisOf(that)) == 0 &&
2724 lenient == that.lenient &&
2725 firstDayOfWeek == that.firstDayOfWeek &&
2726 minimalDaysInFirstWeek == that.minimalDaysInFirstWeek &&
2727 zone.equals(that.zone);
2728 } catch (Exception e) {
2729 // Note: GregorianCalendar.computeTime throws
2730 // IllegalArgumentException if the ERA value is invalid
2731 // even it's in lenient mode.
2732 }
2733 return false;
2734 }
2735
2736 /**
2737 * Returns a hash code for this calendar.
2738 *
2739 * @return a hash code value for this object.
2740 * @since 1.2
2741 */
2742 @Override
2743 public int hashCode() {
2744 // 'otheritems' represents the hash code for the previous versions.
2745 int otheritems = (lenient ? 1 : 0)
2746 | (firstDayOfWeek << 1)
2747 | (minimalDaysInFirstWeek << 4)
2748 | (zone.hashCode() << 7);
2749 long t = getMillisOf(this);
2750 return (int) t ^ (int)(t >> 32) ^ otheritems;
2751 }
2752
2753 /**
2754 * Returns whether this <code>Calendar</code> represents a time
2755 * before the time represented by the specified
2756 * <code>Object</code>. This method is equivalent to:
2757 * <pre>{@code
2758 * compareTo(when) < 0
2759 * }</pre>
2760 * if and only if <code>when</code> is a <code>Calendar</code>
2761 * instance. Otherwise, the method returns <code>false</code>.
2762 *
2763 * @param when the <code>Object</code> to be compared
2764 * @return <code>true</code> if the time of this
2765 * <code>Calendar</code> is before the time represented by
2766 * <code>when</code>; <code>false</code> otherwise.
2767 * @see #compareTo(Calendar)
2768 */
2769 public boolean before(Object when) {
2770 return when instanceof Calendar
2771 && compareTo((Calendar)when) < 0;
2772 }
2773
2774 /**
2775 * Returns whether this <code>Calendar</code> represents a time
2776 * after the time represented by the specified
2777 * <code>Object</code>. This method is equivalent to:
2778 * <pre>{@code
2779 * compareTo(when) > 0
2780 * }</pre>
2781 * if and only if <code>when</code> is a <code>Calendar</code>
2782 * instance. Otherwise, the method returns <code>false</code>.
2783 *
2784 * @param when the <code>Object</code> to be compared
2785 * @return <code>true</code> if the time of this <code>Calendar</code> is
2786 * after the time represented by <code>when</code>; <code>false</code>
2787 * otherwise.
2788 * @see #compareTo(Calendar)
2789 */
2790 public boolean after(Object when) {
2791 return when instanceof Calendar
2792 && compareTo((Calendar)when) > 0;
2793 }
2794
2795 /**
2796 * Compares the time values (millisecond offsets from the <a
2797 * href="#Epoch">Epoch</a>) represented by two
2798 * <code>Calendar</code> objects.
2799 *
2800 * @param anotherCalendar the <code>Calendar</code> to be compared.
2801 * @return the value <code>0</code> if the time represented by the argument
2802 * is equal to the time represented by this <code>Calendar</code>; a value
2803 * less than <code>0</code> if the time of this <code>Calendar</code> is
2804 * before the time represented by the argument; and a value greater than
2805 * <code>0</code> if the time of this <code>Calendar</code> is after the
2806 * time represented by the argument.
2807 * @exception NullPointerException if the specified <code>Calendar</code> is
2808 * <code>null</code>.
2809 * @exception IllegalArgumentException if the time value of the
2810 * specified <code>Calendar</code> object can't be obtained due to
2811 * any invalid calendar values.
2812 * @since 1.5
2813 */
2814 @Override
2815 public int compareTo(Calendar anotherCalendar) {
2816 return compareTo(getMillisOf(anotherCalendar));
2817 }
2818
2819 /**
2820 * Adds or subtracts the specified amount of time to the given calendar field,
2821 * based on the calendar's rules. For example, to subtract 5 days from
2822 * the current time of the calendar, you can achieve it by calling:
2823 * <p><code>add(Calendar.DAY_OF_MONTH, -5)</code>.
2824 *
2825 * @param field the calendar field.
2826 * @param amount the amount of date or time to be added to the field.
2827 * @see #roll(int,int)
2828 * @see #set(int,int)
2829 */
2830 public abstract void add(int field, int amount);
2831
2832 /**
2833 * Adds or subtracts (up/down) a single unit of time on the given time
2834 * field without changing larger fields. For example, to roll the current
2835 * date up by one day, you can achieve it by calling:
2836 * <p>roll(Calendar.DATE, true).
2837 * When rolling on the year or Calendar.YEAR field, it will roll the year
2838 * value in the range between 1 and the value returned by calling
2839 * <code>getMaximum(Calendar.YEAR)</code>.
2840 * When rolling on the month or Calendar.MONTH field, other fields like
2841 * date might conflict and, need to be changed. For instance,
2842 * rolling the month on the date 01/31/96 will result in 02/29/96.
2843 * When rolling on the hour-in-day or Calendar.HOUR_OF_DAY field, it will
2844 * roll the hour value in the range between 0 and 23, which is zero-based.
2845 *
2846 * @param field the time field.
2847 * @param up indicates if the value of the specified time field is to be
2848 * rolled up or rolled down. Use true if rolling up, false otherwise.
2849 * @see Calendar#add(int,int)
2850 * @see Calendar#set(int,int)
2851 */
2852 public abstract void roll(int field, boolean up);
2853
2854 /**
2855 * Adds the specified (signed) amount to the specified calendar field
2856 * without changing larger fields. A negative amount means to roll
2857 * down.
2858 *
2859 * <p>NOTE: This default implementation on <code>Calendar</code> just repeatedly calls the
2860 * version of {@link #roll(int,boolean) roll()} that rolls by one unit. This may not
2861 * always do the right thing. For example, if the <code>DAY_OF_MONTH</code> field is 31,
2862 * rolling through February will leave it set to 28. The <code>GregorianCalendar</code>
2863 * version of this function takes care of this problem. Other subclasses
2864 * should also provide overrides of this function that do the right thing.
2865 *
2866 * @param field the calendar field.
2867 * @param amount the signed amount to add to the calendar <code>field</code>.
2868 * @since 1.2
2869 * @see #roll(int,boolean)
2870 * @see #add(int,int)
2871 * @see #set(int,int)
2872 */
2873 public void roll(int field, int amount)
2874 {
2875 while (amount > 0) {
2876 roll(field, true);
2877 amount--;
2878 }
2879 while (amount < 0) {
2880 roll(field, false);
2881 amount++;
2882 }
2883 }
2884
2885 /**
2886 * Sets the time zone with the given time zone value.
2887 *
2888 * @param value the given time zone.
2889 */
2890 public void setTimeZone(TimeZone value)
2891 {
2892 zone = value;
2893 sharedZone = false;
2894 /* Recompute the fields from the time using the new zone. This also
2895 * works if isTimeSet is false (after a call to set()). In that case
2896 * the time will be computed from the fields using the new zone, then
2897 * the fields will get recomputed from that. Consider the sequence of
2898 * calls: cal.setTimeZone(EST); cal.set(HOUR, 1); cal.setTimeZone(PST).
2899 * Is cal set to 1 o'clock EST or 1 o'clock PST? Answer: PST. More
2900 * generally, a call to setTimeZone() affects calls to set() BEFORE AND
2901 * AFTER it up to the next call to complete().
2902 */
2903 areAllFieldsSet = areFieldsSet = false;
2904 }
2905
2906 /**
2907 * Gets the time zone.
2908 *
2909 * @return the time zone object associated with this calendar.
2910 */
2911 public TimeZone getTimeZone()
2912 {
2913 // If the TimeZone object is shared by other Calendar instances, then
2914 // create a clone.
2915 if (sharedZone) {
2916 zone = (TimeZone) zone.clone();
2917 sharedZone = false;
2918 }
2919 return zone;
2920 }
2921
2922 /**
2923 * Returns the time zone (without cloning).
2924 */
2925 TimeZone getZone() {
2926 return zone;
2927 }
2928
2929 /**
2930 * Sets the sharedZone flag to <code>shared</code>.
2931 */
2932 void setZoneShared(boolean shared) {
2933 sharedZone = shared;
2934 }
2935
2936 /**
2937 * Specifies whether or not date/time interpretation is to be lenient. With
2938 * lenient interpretation, a date such as "February 942, 1996" will be
2939 * treated as being equivalent to the 941st day after February 1, 1996.
2940 * With strict (non-lenient) interpretation, such dates will cause an exception to be
2941 * thrown. The default is lenient.
2942 *
2943 * @param lenient <code>true</code> if the lenient mode is to be turned
2944 * on; <code>false</code> if it is to be turned off.
2945 * @see #isLenient()
2946 * @see java.text.DateFormat#setLenient
2947 */
2948 public void setLenient(boolean lenient)
2949 {
2950 this.lenient = lenient;
2951 }
2952
2953 /**
2954 * Tells whether date/time interpretation is to be lenient.
2955 *
2956 * @return <code>true</code> if the interpretation mode of this calendar is lenient;
2957 * <code>false</code> otherwise.
2958 * @see #setLenient(boolean)
2959 */
2960 public boolean isLenient()
2961 {
2962 return lenient;
2963 }
2964
2965 /**
2966 * Sets what the first day of the week is; e.g., <code>SUNDAY</code> in the U.S.,
2967 * <code>MONDAY</code> in France.
2968 *
2969 * @param value the given first day of the week.
2970 * @see #getFirstDayOfWeek()
2971 * @see #getMinimalDaysInFirstWeek()
2972 */
2973 public void setFirstDayOfWeek(int value)
2974 {
2975 if (firstDayOfWeek == value) {
2976 return;
2977 }
2978 firstDayOfWeek = value;
2979 invalidateWeekFields();
2980 }
2981
2982 /**
2983 * Gets what the first day of the week is; e.g., <code>SUNDAY</code> in the U.S.,
2984 * <code>MONDAY</code> in France.
2985 *
2986 * @return the first day of the week.
2987 * @see #setFirstDayOfWeek(int)
2988 * @see #getMinimalDaysInFirstWeek()
2989 */
2990 public int getFirstDayOfWeek()
2991 {
2992 return firstDayOfWeek;
2993 }
2994
2995 /**
2996 * Sets what the minimal days required in the first week of the year are;
2997 * For example, if the first week is defined as one that contains the first
2998 * day of the first month of a year, call this method with value 1. If it
2999 * must be a full week, use value 7.
3000 *
3001 * @param value the given minimal days required in the first week
3002 * of the year.
3003 * @see #getMinimalDaysInFirstWeek()
3004 */
3005 public void setMinimalDaysInFirstWeek(int value)
3006 {
3007 if (minimalDaysInFirstWeek == value) {
3008 return;
3009 }
3010 minimalDaysInFirstWeek = value;
3011 invalidateWeekFields();
3012 }
3013
3014 /**
3015 * Gets what the minimal days required in the first week of the year are;
3016 * e.g., if the first week is defined as one that contains the first day
3017 * of the first month of a year, this method returns 1. If
3018 * the minimal days required must be a full week, this method
3019 * returns 7.
3020 *
3021 * @return the minimal days required in the first week of the year.
3022 * @see #setMinimalDaysInFirstWeek(int)
3023 */
3024 public int getMinimalDaysInFirstWeek()
3025 {
3026 return minimalDaysInFirstWeek;
3027 }
3028
3029 /**
3030 * Returns whether this {@code Calendar} supports week dates.
3031 *
3032 * <p>The default implementation of this method returns {@code false}.
3033 *
3034 * @return {@code true} if this {@code Calendar} supports week dates;
3035 * {@code false} otherwise.
3036 * @see #getWeekYear()
3037 * @see #setWeekDate(int,int,int)
3038 * @see #getWeeksInWeekYear()
3039 * @since 1.7
3040 */
3041 public boolean isWeekDateSupported() {
3042 return false;
3043 }
3044
3045 /**
3046 * Returns the week year represented by this {@code Calendar}. The
3047 * week year is in sync with the week cycle. The {@linkplain
3048 * #getFirstDayOfWeek() first day of the first week} is the first
3049 * day of the week year.
3050 *
3051 * <p>The default implementation of this method throws an
3052 * {@link UnsupportedOperationException}.
3053 *
3054 * @return the week year of this {@code Calendar}
3055 * @exception UnsupportedOperationException
3056 * if any week year numbering isn't supported
3057 * in this {@code Calendar}.
3058 * @see #isWeekDateSupported()
3059 * @see #getFirstDayOfWeek()
3060 * @see #getMinimalDaysInFirstWeek()
3061 * @since 1.7
3062 */
3063 public int getWeekYear() {
3064 throw new UnsupportedOperationException();
3065 }
3066
3067 /**
3068 * Sets the date of this {@code Calendar} with the given date
3069 * specifiers - week year, week of year, and day of week.
3070 *
3071 * <p>Unlike the {@code set} method, all of the calendar fields
3072 * and {@code time} values are calculated upon return.
3073 *
3074 * <p>If {@code weekOfYear} is out of the valid week-of-year range
3075 * in {@code weekYear}, the {@code weekYear} and {@code
3076 * weekOfYear} values are adjusted in lenient mode, or an {@code
3077 * IllegalArgumentException} is thrown in non-lenient mode.
3078 *
3079 * <p>The default implementation of this method throws an
3080 * {@code UnsupportedOperationException}.
3081 *
3082 * @param weekYear the week year
3083 * @param weekOfYear the week number based on {@code weekYear}
3084 * @param dayOfWeek the day of week value: one of the constants
3085 * for the {@link #DAY_OF_WEEK} field: {@link
3086 * #SUNDAY}, ..., {@link #SATURDAY}.
3087 * @exception IllegalArgumentException
3088 * if any of the given date specifiers is invalid
3089 * or any of the calendar fields are inconsistent
3090 * with the given date specifiers in non-lenient mode
3091 * @exception UnsupportedOperationException
3092 * if any week year numbering isn't supported in this
3093 * {@code Calendar}.
3094 * @see #isWeekDateSupported()
3095 * @see #getFirstDayOfWeek()
3096 * @see #getMinimalDaysInFirstWeek()
3097 * @since 1.7
3098 */
3099 public void setWeekDate(int weekYear, int weekOfYear, int dayOfWeek) {
3100 throw new UnsupportedOperationException();
3101 }
3102
3103 /**
3104 * Returns the number of weeks in the week year represented by this
3105 * {@code Calendar}.
3106 *
3107 * <p>The default implementation of this method throws an
3108 * {@code UnsupportedOperationException}.
3109 *
3110 * @return the number of weeks in the week year.
3111 * @exception UnsupportedOperationException
3112 * if any week year numbering isn't supported in this
3113 * {@code Calendar}.
3114 * @see #WEEK_OF_YEAR
3115 * @see #isWeekDateSupported()
3116 * @see #getWeekYear()
3117 * @see #getActualMaximum(int)
3118 * @since 1.7
3119 */
3120 public int getWeeksInWeekYear() {
3121 throw new UnsupportedOperationException();
3122 }
3123
3124 /**
3125 * Returns the minimum value for the given calendar field of this
3126 * <code>Calendar</code> instance. The minimum value is defined as
3127 * the smallest value returned by the {@link #get(int) get} method
3128 * for any possible time value. The minimum value depends on
3129 * calendar system specific parameters of the instance.
3130 *
3131 * @param field the calendar field.
3132 * @return the minimum value for the given calendar field.
3133 * @see #getMaximum(int)
3134 * @see #getGreatestMinimum(int)
3135 * @see #getLeastMaximum(int)
3136 * @see #getActualMinimum(int)
3137 * @see #getActualMaximum(int)
3138 */
3139 public abstract int getMinimum(int field);
3140
3141 /**
3142 * Returns the maximum value for the given calendar field of this
3143 * <code>Calendar</code> instance. The maximum value is defined as
3144 * the largest value returned by the {@link #get(int) get} method
3145 * for any possible time value. The maximum value depends on
3146 * calendar system specific parameters of the instance.
3147 *
3148 * @param field the calendar field.
3149 * @return the maximum value for the given calendar field.
3150 * @see #getMinimum(int)
3151 * @see #getGreatestMinimum(int)
3152 * @see #getLeastMaximum(int)
3153 * @see #getActualMinimum(int)
3154 * @see #getActualMaximum(int)
3155 */
3156 public abstract int getMaximum(int field);
3157
3158 /**
3159 * Returns the highest minimum value for the given calendar field
3160 * of this <code>Calendar</code> instance. The highest minimum
3161 * value is defined as the largest value returned by {@link
3162 * #getActualMinimum(int)} for any possible time value. The
3163 * greatest minimum value depends on calendar system specific
3164 * parameters of the instance.
3165 *
3166 * @param field the calendar field.
3167 * @return the highest minimum value for the given calendar field.
3168 * @see #getMinimum(int)
3169 * @see #getMaximum(int)
3170 * @see #getLeastMaximum(int)
3171 * @see #getActualMinimum(int)
3172 * @see #getActualMaximum(int)
3173 */
3174 public abstract int getGreatestMinimum(int field);
3175
3176 /**
3177 * Returns the lowest maximum value for the given calendar field
3178 * of this <code>Calendar</code> instance. The lowest maximum
3179 * value is defined as the smallest value returned by {@link
3180 * #getActualMaximum(int)} for any possible time value. The least
3181 * maximum value depends on calendar system specific parameters of
3182 * the instance. For example, a <code>Calendar</code> for the
3183 * Gregorian calendar system returns 28 for the
3184 * <code>DAY_OF_MONTH</code> field, because the 28th is the last
3185 * day of the shortest month of this calendar, February in a
3186 * common year.
3187 *
3188 * @param field the calendar field.
3189 * @return the lowest maximum value for the given calendar field.
3190 * @see #getMinimum(int)
3191 * @see #getMaximum(int)
3192 * @see #getGreatestMinimum(int)
3193 * @see #getActualMinimum(int)
3194 * @see #getActualMaximum(int)
3195 */
3196 public abstract int getLeastMaximum(int field);
3197
3198 /**
3199 * Returns the minimum value that the specified calendar field
3200 * could have, given the time value of this <code>Calendar</code>.
3201 *
3202 * <p>The default implementation of this method uses an iterative
3203 * algorithm to determine the actual minimum value for the
3204 * calendar field. Subclasses should, if possible, override this
3205 * with a more efficient implementation - in many cases, they can
3206 * simply return <code>getMinimum()</code>.
3207 *
3208 * @param field the calendar field
3209 * @return the minimum of the given calendar field for the time
3210 * value of this <code>Calendar</code>
3211 * @see #getMinimum(int)
3212 * @see #getMaximum(int)
3213 * @see #getGreatestMinimum(int)
3214 * @see #getLeastMaximum(int)
3215 * @see #getActualMaximum(int)
3216 * @since 1.2
3217 */
3218 public int getActualMinimum(int field) {
3219 int fieldValue = getGreatestMinimum(field);
3220 int endValue = getMinimum(field);
3221
3222 // if we know that the minimum value is always the same, just return it
3223 if (fieldValue == endValue) {
3224 return fieldValue;
3225 }
3226
3227 // clone the calendar so we don't mess with the real one, and set it to
3228 // accept anything for the field values
3229 Calendar work = (Calendar)this.clone();
3230 work.setLenient(true);
3231
3232 // now try each value from getLeastMaximum() to getMaximum() one by one until
3233 // we get a value that normalizes to another value. The last value that
3234 // normalizes to itself is the actual minimum for the current date
3235 int result = fieldValue;
3236
3237 do {
3238 work.set(field, fieldValue);
3239 if (work.get(field) != fieldValue) {
3240 break;
3241 } else {
3242 result = fieldValue;
3243 fieldValue--;
3244 }
3245 } while (fieldValue >= endValue);
3246
3247 return result;
3248 }
3249
3250 /**
3251 * Returns the maximum value that the specified calendar field
3252 * could have, given the time value of this
3253 * <code>Calendar</code>. For example, the actual maximum value of
3254 * the <code>MONTH</code> field is 12 in some years, and 13 in
3255 * other years in the Hebrew calendar system.
3256 *
3257 * <p>The default implementation of this method uses an iterative
3258 * algorithm to determine the actual maximum value for the
3259 * calendar field. Subclasses should, if possible, override this
3260 * with a more efficient implementation.
3261 *
3262 * @param field the calendar field
3263 * @return the maximum of the given calendar field for the time
3264 * value of this <code>Calendar</code>
3265 * @see #getMinimum(int)
3266 * @see #getMaximum(int)
3267 * @see #getGreatestMinimum(int)
3268 * @see #getLeastMaximum(int)
3269 * @see #getActualMinimum(int)
3270 * @since 1.2
3271 */
3272 public int getActualMaximum(int field) {
3273 int fieldValue = getLeastMaximum(field);
3274 int endValue = getMaximum(field);
3275
3276 // if we know that the maximum value is always the same, just return it.
3277 if (fieldValue == endValue) {
3278 return fieldValue;
3279 }
3280
3281 // clone the calendar so we don't mess with the real one, and set it to
3282 // accept anything for the field values.
3283 Calendar work = (Calendar)this.clone();
3284 work.setLenient(true);
3285
3286 // if we're counting weeks, set the day of the week to Sunday. We know the
3287 // last week of a month or year will contain the first day of the week.
3288 if (field == WEEK_OF_YEAR || field == WEEK_OF_MONTH) {
3289 work.set(DAY_OF_WEEK, firstDayOfWeek);
3290 }
3291
3292 // now try each value from getLeastMaximum() to getMaximum() one by one until
3293 // we get a value that normalizes to another value. The last value that
3294 // normalizes to itself is the actual maximum for the current date
3295 int result = fieldValue;
3296
3297 do {
3298 work.set(field, fieldValue);
3299 if (work.get(field) != fieldValue) {
3300 break;
3301 } else {
3302 result = fieldValue;
3303 fieldValue++;
3304 }
3305 } while (fieldValue <= endValue);
3306
3307 return result;
3308 }
3309
3310 /**
3311 * Creates and returns a copy of this object.
3312 *
3313 * @return a copy of this object.
3314 */
3315 @Override
3316 public Object clone()
3317 {
3318 try {
3319 Calendar other = (Calendar) super.clone();
3320
3321 other.fields = new int[FIELD_COUNT];
3322 other.isSet = new boolean[FIELD_COUNT];
3323 other.stamp = new int[FIELD_COUNT];
3324 for (int i = 0; i < FIELD_COUNT; i++) {
3325 other.fields[i] = fields[i];
3326 other.stamp[i] = stamp[i];
3327 other.isSet[i] = isSet[i];
3328 }
3329 other.zone = (TimeZone) zone.clone();
3330 return other;
3331 }
3332 catch (CloneNotSupportedException e) {
3333 // this shouldn't happen, since we are Cloneable
3334 throw new InternalError(e);
3335 }
3336 }
3337
3338 private static final String[] FIELD_NAME = {
3339 "ERA", "YEAR", "MONTH", "WEEK_OF_YEAR", "WEEK_OF_MONTH", "DAY_OF_MONTH",
3340 "DAY_OF_YEAR", "DAY_OF_WEEK", "DAY_OF_WEEK_IN_MONTH", "AM_PM", "HOUR",
3341 "HOUR_OF_DAY", "MINUTE", "SECOND", "MILLISECOND", "ZONE_OFFSET",
3342 "DST_OFFSET"
3343 };
3344
3345 /**
3346 * Returns the name of the specified calendar field.
3347 *
3348 * @param field the calendar field
3349 * @return the calendar field name
3350 * @exception IndexOutOfBoundsException if <code>field</code> is negative,
3351 * equal to or greater than {@code FIELD_COUNT}.
3352 */
3353 static String getFieldName(int field) {
3354 return FIELD_NAME[field];
3355 }
3356
3357 /**
3358 * Return a string representation of this calendar. This method
3359 * is intended to be used only for debugging purposes, and the
3360 * format of the returned string may vary between implementations.
3361 * The returned string may be empty but may not be <code>null</code>.
3362 *
3363 * @return a string representation of this calendar.
3364 */
3365 @Override
3366 public String toString() {
3367 // NOTE: BuddhistCalendar.toString() interprets the string
3368 // produced by this method so that the Gregorian year number
3369 // is substituted by its B.E. year value. It relies on
3370 // "...,YEAR=<year>,..." or "...,YEAR=?,...".
3371 StringBuilder buffer = new StringBuilder(800);
3372 buffer.append(getClass().getName()).append('[');
3373 appendValue(buffer, "time", isTimeSet, time);
3374 buffer.append(",areFieldsSet=").append(areFieldsSet);
3375 buffer.append(",areAllFieldsSet=").append(areAllFieldsSet);
3376 buffer.append(",lenient=").append(lenient);
3377 buffer.append(",zone=").append(zone);
3378 appendValue(buffer, ",firstDayOfWeek", true, (long) firstDayOfWeek);
3379 appendValue(buffer, ",minimalDaysInFirstWeek", true, (long) minimalDaysInFirstWeek);
3380 for (int i = 0; i < FIELD_COUNT; ++i) {
3381 buffer.append(',');
3382 appendValue(buffer, FIELD_NAME[i], isSet(i), (long) fields[i]);
3383 }
3384 buffer.append(']');
3385 return buffer.toString();
3386 }
3387
3388 // =======================privates===============================
3389
3390 private static void appendValue(StringBuilder sb, String item, boolean valid, long value) {
3391 sb.append(item).append('=');
3392 if (valid) {
3393 sb.append(value);
3394 } else {
3395 sb.append('?');
3396 }
3397 }
3398
3399 /**
3400 * Both firstDayOfWeek and minimalDaysInFirstWeek are locale-dependent.
3401 * They are used to figure out the week count for a specific date for
3402 * a given locale. These must be set when a Calendar is constructed.
3403 * @param desiredLocale the given locale.
3404 */
3405 private void setWeekCountData(Locale desiredLocale)
3406 {
3407 /* try to get the Locale data from the cache */
3408 int[] data = cachedLocaleData.get(desiredLocale);
3409 if (data == null) { /* cache miss */
3410 data = new int[2];
3411 data[0] = CalendarDataUtility.retrieveFirstDayOfWeek(desiredLocale);
3412 data[1] = CalendarDataUtility.retrieveMinimalDaysInFirstWeek(desiredLocale);
3413 cachedLocaleData.putIfAbsent(desiredLocale, data);
3414 }
3415 firstDayOfWeek = data[0];
3416 minimalDaysInFirstWeek = data[1];
3417 }
3418
3419 /**
3420 * Recomputes the time and updates the status fields isTimeSet
3421 * and areFieldsSet. Callers should check isTimeSet and only
3422 * call this method if isTimeSet is false.
3423 */
3424 private void updateTime() {
3425 computeTime();
3426 // The areFieldsSet and areAllFieldsSet values are no longer
3427 // controlled here (as of 1.5).
3428 isTimeSet = true;
3429 }
3430
3431 private int compareTo(long t) {
3432 long thisTime = getMillisOf(this);
3433 return (thisTime > t) ? 1 : (thisTime == t) ? 0 : -1;
3434 }
3435
3436 private static long getMillisOf(Calendar calendar) {
3437 if (calendar.isTimeSet) {
3438 return calendar.time;
3439 }
3440 Calendar cal = (Calendar) calendar.clone();
3441 cal.setLenient(true);
3442 return cal.getTimeInMillis();
3443 }
3444
3445 /**
3446 * Adjusts the stamp[] values before nextStamp overflow. nextStamp
3447 * is set to the next stamp value upon the return.
3448 */
3449 private void adjustStamp() {
3450 int max = MINIMUM_USER_STAMP;
3451 int newStamp = MINIMUM_USER_STAMP;
3452
3453 for (;;) {
3454 int min = Integer.MAX_VALUE;
3455 for (int v : stamp) {
3456 if (v >= newStamp && min > v) {
3457 min = v;
3458 }
3459 if (max < v) {
3460 max = v;
3461 }
3462 }
3463 if (max != min && min == Integer.MAX_VALUE) {
3464 break;
3465 }
3466 for (int i = 0; i < stamp.length; i++) {
3467 if (stamp[i] == min) {
3468 stamp[i] = newStamp;
3469 }
3470 }
3471 newStamp++;
3472 if (min == max) {
3473 break;
3474 }
3475 }
3476 nextStamp = newStamp;
3477 }
3478
3479 /**
3480 * Sets the WEEK_OF_MONTH and WEEK_OF_YEAR fields to new values with the
3481 * new parameter value if they have been calculated internally.
3482 */
3483 private void invalidateWeekFields()
3484 {
3485 if (stamp[WEEK_OF_MONTH] != COMPUTED &&
3486 stamp[WEEK_OF_YEAR] != COMPUTED) {
3487 return;
3488 }
3489
3490 // We have to check the new values of these fields after changing
3491 // firstDayOfWeek and/or minimalDaysInFirstWeek. If the field values
3492 // have been changed, then set the new values. (4822110)
3493 Calendar cal = (Calendar) clone();
3494 cal.setLenient(true);
3495 cal.clear(WEEK_OF_MONTH);
3496 cal.clear(WEEK_OF_YEAR);
3497
3498 if (stamp[WEEK_OF_MONTH] == COMPUTED) {
3499 int weekOfMonth = cal.get(WEEK_OF_MONTH);
3500 if (fields[WEEK_OF_MONTH] != weekOfMonth) {
3501 fields[WEEK_OF_MONTH] = weekOfMonth;
3502 }
3503 }
3504
3505 if (stamp[WEEK_OF_YEAR] == COMPUTED) {
3506 int weekOfYear = cal.get(WEEK_OF_YEAR);
3507 if (fields[WEEK_OF_YEAR] != weekOfYear) {
3508 fields[WEEK_OF_YEAR] = weekOfYear;
3509 }
3510 }
3511 }
3512
3513 /**
3514 * Save the state of this object to a stream (i.e., serialize it).
3515 *
3516 * Ideally, <code>Calendar</code> would only write out its state data and
3517 * the current time, and not write any field data out, such as
3518 * <code>fields[]</code>, <code>isTimeSet</code>, <code>areFieldsSet</code>,
3519 * and <code>isSet[]</code>. <code>nextStamp</code> also should not be part
3520 * of the persistent state. Unfortunately, this didn't happen before JDK 1.1
3521 * shipped. To be compatible with JDK 1.1, we will always have to write out
3522 * the field values and state flags. However, <code>nextStamp</code> can be
3523 * removed from the serialization stream; this will probably happen in the
3524 * near future.
3525 */
3526 private synchronized void writeObject(ObjectOutputStream stream)
3527 throws IOException
3528 {
3529 // Try to compute the time correctly, for the future (stream
3530 // version 2) in which we don't write out fields[] or isSet[].
3531 if (!isTimeSet) {
3532 try {
3533 updateTime();
3534 }
3535 catch (IllegalArgumentException e) {}
3536 }
3537
3538 // If this Calendar has a ZoneInfo, save it and set a
3539 // SimpleTimeZone equivalent (as a single DST schedule) for
3540 // backward compatibility.
3541 TimeZone savedZone = null;
3542 if (zone instanceof ZoneInfo) {
3543 SimpleTimeZone stz = ((ZoneInfo)zone).getLastRuleInstance();
3544 if (stz == null) {
3545 stz = new SimpleTimeZone(zone.getRawOffset(), zone.getID());
3546 }
3547 savedZone = zone;
3548 zone = stz;
3549 }
3550
3551 // Write out the 1.1 FCS object.
3552 stream.defaultWriteObject();
3553
3554 // Write out the ZoneInfo object
3555 // 4802409: we write out even if it is null, a temporary workaround
3556 // the real fix for bug 4844924 in corba-iiop
3557 stream.writeObject(savedZone);
3558 if (savedZone != null) {
3559 zone = savedZone;
3560 }
3561 }
3562
3563 private static class CalendarAccessControlContext {
3564 private static final AccessControlContext INSTANCE;
3565 static {
3566 RuntimePermission perm = new RuntimePermission("accessClassInPackage.sun.util.calendar");
3567 PermissionCollection perms = perm.newPermissionCollection();
3568 perms.add(perm);
3569 INSTANCE = new AccessControlContext(new ProtectionDomain[] {
3570 new ProtectionDomain(null, perms)
3571 });
3572 }
3573 private CalendarAccessControlContext() {
3574 }
3575 }
3576
3577 /**
3578 * Reconstitutes this object from a stream (i.e., deserialize it).
3579 */
3580 private void readObject(ObjectInputStream stream)
3581 throws IOException, ClassNotFoundException
3582 {
3583 final ObjectInputStream input = stream;
3584 input.defaultReadObject();
3585
3586 stamp = new int[FIELD_COUNT];
3587
3588 // Starting with version 2 (not implemented yet), we expect that
3589 // fields[], isSet[], isTimeSet, and areFieldsSet may not be
3590 // streamed out anymore. We expect 'time' to be correct.
3591 if (serialVersionOnStream >= 2)
3592 {
3593 isTimeSet = true;
3594 if (fields == null) {
3595 fields = new int[FIELD_COUNT];
3596 }
3597 if (isSet == null) {
3598 isSet = new boolean[FIELD_COUNT];
3599 }
3600 }
3601 else if (serialVersionOnStream >= 0)
3602 {
3603 for (int i=0; i<FIELD_COUNT; ++i) {
3604 stamp[i] = isSet[i] ? COMPUTED : UNSET;
3605 }
3606 }
3607
3608 serialVersionOnStream = currentSerialVersion;
3609
3610 // If there's a ZoneInfo object, use it for zone.
3611 ZoneInfo zi = null;
3612 try {
3613 zi = AccessController.doPrivileged(
3614 new PrivilegedExceptionAction<>() {
3615 @Override
3616 public ZoneInfo run() throws Exception {
3617 return (ZoneInfo) input.readObject();
3618 }
3619 },
3620 CalendarAccessControlContext.INSTANCE);
3621 } catch (PrivilegedActionException pae) {
3622 Exception e = pae.getException();
3623 if (!(e instanceof OptionalDataException)) {
3624 if (e instanceof RuntimeException) {
3625 throw (RuntimeException) e;
3626 } else if (e instanceof IOException) {
3627 throw (IOException) e;
3628 } else if (e instanceof ClassNotFoundException) {
3629 throw (ClassNotFoundException) e;
3630 }
3631 throw new RuntimeException(e);
3632 }
3633 }
3634 if (zi != null) {
3635 zone = zi;
3636 }
3637
3638 // If the deserialized object has a SimpleTimeZone, try to
3639 // replace it with a ZoneInfo equivalent (as of 1.4) in order
3640 // to be compatible with the SimpleTimeZone-based
3641 // implementation as much as possible.
3642 if (zone instanceof SimpleTimeZone) {
3643 String id = zone.getID();
3644 TimeZone tz = TimeZone.getTimeZone(id);
3645 if (tz != null && tz.hasSameRules(zone) && tz.getID().equals(id)) {
3646 zone = tz;
3647 }
3648 }
3649 }
3650
3651 /**
3652 * Converts this object to an {@link Instant}.
3653 * <p>
3654 * The conversion creates an {@code Instant} that represents the
3655 * same point on the time-line as this {@code Calendar}.
3656 *
3657 * @return the instant representing the same point on the time-line
3658 * @since 1.8
3659 */
3660 public final Instant toInstant() {
3661 return Instant.ofEpochMilli(getTimeInMillis());
3662 }
3663 }