1// © 2016 and later: Unicode, Inc. and others.
2// License & terms of use: http://www.unicode.org/copyright.html
3/*
4******************************************************************************
5* Copyright (C) 2003-2016, International Business Machines Corporation
6* and others. All Rights Reserved.
7******************************************************************************
8*
9* File HEBRWCAL.CPP
10*
11* Modification History:
12*
13* Date Name Description
14* 12/03/2003 srl ported from java HebrewCalendar
15*****************************************************************************
16*/
17
18#include "hebrwcal.h"
19
20#if !UCONFIG_NO_FORMATTING
21
22#include "cmemory.h"
23#include "umutex.h"
24#include <float.h>
25#include "gregoimp.h" // Math
26#include "astro.h" // CalendarAstronomer
27#include "uhash.h"
28#include "ucln_in.h"
29
30// Hebrew Calendar implementation
31
32/**
33* The absolute date, in milliseconds since 1/1/1970 AD, Gregorian,
34* of the start of the Hebrew calendar. In order to keep this calendar's
35* time of day in sync with that of the Gregorian calendar, we use
36* midnight, rather than sunset the day before.
37*/
38//static const double EPOCH_MILLIS = -180799862400000.; // 1/1/1 HY
39
40static const int32_t LIMITS[UCAL_FIELD_COUNT][4] = {
41 // Minimum Greatest Least Maximum
42 // Minimum Maximum
43 { 0, 0, 0, 0}, // ERA
44 { -5000000, -5000000, 5000000, 5000000}, // YEAR
45 { 0, 0, 12, 12}, // MONTH
46 { 1, 1, 51, 56}, // WEEK_OF_YEAR
47 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // WEEK_OF_MONTH
48 { 1, 1, 29, 30}, // DAY_OF_MONTH
49 { 1, 1, 353, 385}, // DAY_OF_YEAR
50 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // DAY_OF_WEEK
51 { -1, -1, 5, 5}, // DAY_OF_WEEK_IN_MONTH
52 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // AM_PM
53 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // HOUR
54 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // HOUR_OF_DAY
55 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // MINUTE
56 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // SECOND
57 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // MILLISECOND
58 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // ZONE_OFFSET
59 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // DST_OFFSET
60 { -5000000, -5000000, 5000000, 5000000}, // YEAR_WOY
61 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // DOW_LOCAL
62 { -5000000, -5000000, 5000000, 5000000}, // EXTENDED_YEAR
63 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // JULIAN_DAY
64 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // MILLISECONDS_IN_DAY
65 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // IS_LEAP_MONTH
66};
67
68/**
69* The lengths of the Hebrew months. This is complicated, because there
70* are three different types of years, or six if you count leap years.
71* Due to the rules for postponing the start of the year to avoid having
72* certain holidays fall on the sabbath, the year can end up being three
73* different lengths, called "deficient", "normal", and "complete".
74*/
75static const int8_t MONTH_LENGTH[][3] = {
76 // Deficient Normal Complete
77 { 30, 30, 30 }, //Tishri
78 { 29, 29, 30 }, //Heshvan
79 { 29, 30, 30 }, //Kislev
80 { 29, 29, 29 }, //Tevet
81 { 30, 30, 30 }, //Shevat
82 { 30, 30, 30 }, //Adar I (leap years only)
83 { 29, 29, 29 }, //Adar
84 { 30, 30, 30 }, //Nisan
85 { 29, 29, 29 }, //Iyar
86 { 30, 30, 30 }, //Sivan
87 { 29, 29, 29 }, //Tammuz
88 { 30, 30, 30 }, //Av
89 { 29, 29, 29 }, //Elul
90};
91
92/**
93* The cumulative # of days to the end of each month in a non-leap year
94* Although this can be calculated from the MONTH_LENGTH table,
95* keeping it around separately makes some calculations a lot faster
96*/
97
98static const int16_t MONTH_START[][3] = {
99 // Deficient Normal Complete
100 { 0, 0, 0 }, // (placeholder)
101 { 30, 30, 30 }, // Tishri
102 { 59, 59, 60 }, // Heshvan
103 { 88, 89, 90 }, // Kislev
104 { 117, 118, 119 }, // Tevet
105 { 147, 148, 149 }, // Shevat
106 { 147, 148, 149 }, // (Adar I placeholder)
107 { 176, 177, 178 }, // Adar
108 { 206, 207, 208 }, // Nisan
109 { 235, 236, 237 }, // Iyar
110 { 265, 266, 267 }, // Sivan
111 { 294, 295, 296 }, // Tammuz
112 { 324, 325, 326 }, // Av
113 { 353, 354, 355 }, // Elul
114};
115
116/**
117* The cumulative # of days to the end of each month in a leap year
118*/
119static const int16_t LEAP_MONTH_START[][3] = {
120 // Deficient Normal Complete
121 { 0, 0, 0 }, // (placeholder)
122 { 30, 30, 30 }, // Tishri
123 { 59, 59, 60 }, // Heshvan
124 { 88, 89, 90 }, // Kislev
125 { 117, 118, 119 }, // Tevet
126 { 147, 148, 149 }, // Shevat
127 { 177, 178, 179 }, // Adar I
128 { 206, 207, 208 }, // Adar II
129 { 236, 237, 238 }, // Nisan
130 { 265, 266, 267 }, // Iyar
131 { 295, 296, 297 }, // Sivan
132 { 324, 325, 326 }, // Tammuz
133 { 354, 355, 356 }, // Av
134 { 383, 384, 385 }, // Elul
135};
136
137static icu::CalendarCache *gCache = NULL;
138
139U_CDECL_BEGIN
140static UBool calendar_hebrew_cleanup(void) {
141 delete gCache;
142 gCache = NULL;
143 return TRUE;
144}
145U_CDECL_END
146
147U_NAMESPACE_BEGIN
148//-------------------------------------------------------------------------
149// Constructors...
150//-------------------------------------------------------------------------
151
152/**
153* Constructs a default <code>HebrewCalendar</code> using the current time
154* in the default time zone with the default locale.
155* @internal
156*/
157HebrewCalendar::HebrewCalendar(const Locale& aLocale, UErrorCode& success)
158: Calendar(TimeZone::createDefault(), aLocale, success)
159
160{
161 setTimeInMillis(getNow(), success); // Call this again now that the vtable is set up properly.
162}
163
164
165HebrewCalendar::~HebrewCalendar() {
166}
167
168const char *HebrewCalendar::getType() const {
169 return "hebrew";
170}
171
172HebrewCalendar* HebrewCalendar::clone() const {
173 return new HebrewCalendar(*this);
174}
175
176HebrewCalendar::HebrewCalendar(const HebrewCalendar& other) : Calendar(other) {
177}
178
179
180//-------------------------------------------------------------------------
181// Rolling and adding functions overridden from Calendar
182//
183// These methods call through to the default implementation in IBMCalendar
184// for most of the fields and only handle the unusual ones themselves.
185//-------------------------------------------------------------------------
186
187/**
188* Add a signed amount to a specified field, using this calendar's rules.
189* For example, to add three days to the current date, you can call
190* <code>add(Calendar.DATE, 3)</code>.
191* <p>
192* When adding to certain fields, the values of other fields may conflict and
193* need to be changed. For example, when adding one to the {@link #MONTH MONTH} field
194* for the date "30 Av 5758", the {@link #DAY_OF_MONTH DAY_OF_MONTH} field
195* must be adjusted so that the result is "29 Elul 5758" rather than the invalid
196* "30 Elul 5758".
197* <p>
198* This method is able to add to
199* all fields except for {@link #ERA ERA}, {@link #DST_OFFSET DST_OFFSET},
200* and {@link #ZONE_OFFSET ZONE_OFFSET}.
201* <p>
202* <b>Note:</b> You should always use {@link #roll roll} and add rather
203* than attempting to perform arithmetic operations directly on the fields
204* of a <tt>HebrewCalendar</tt>. Since the {@link #MONTH MONTH} field behaves
205* discontinuously in non-leap years, simple arithmetic can give invalid results.
206* <p>
207* @param field the time field.
208* @param amount the amount to add to the field.
209*
210* @exception IllegalArgumentException if the field is invalid or refers
211* to a field that cannot be handled by this method.
212* @internal
213*/
214void HebrewCalendar::add(UCalendarDateFields field, int32_t amount, UErrorCode& status)
215{
216 if(U_FAILURE(status)) {
217 return;
218 }
219 switch (field) {
220 case UCAL_MONTH:
221 {
222 // We can't just do a set(MONTH, get(MONTH) + amount). The
223 // reason is ADAR_1. Suppose amount is +2 and we land in
224 // ADAR_1 -- then we have to bump to ADAR_2 aka ADAR. But
225 // if amount is -2 and we land in ADAR_1, then we have to
226 // bump the other way -- down to SHEVAT. - Alan 11/00
227 int32_t month = get(UCAL_MONTH, status);
228 int32_t year = get(UCAL_YEAR, status);
229 UBool acrossAdar1;
230 if (amount > 0) {
231 acrossAdar1 = (month < ADAR_1); // started before ADAR_1?
232 month += amount;
233 for (;;) {
234 if (acrossAdar1 && month>=ADAR_1 && !isLeapYear(year)) {
235 ++month;
236 }
237 if (month <= ELUL) {
238 break;
239 }
240 month -= ELUL+1;
241 ++year;
242 acrossAdar1 = TRUE;
243 }
244 } else {
245 acrossAdar1 = (month > ADAR_1); // started after ADAR_1?
246 month += amount;
247 for (;;) {
248 if (acrossAdar1 && month<=ADAR_1 && !isLeapYear(year)) {
249 --month;
250 }
251 if (month >= 0) {
252 break;
253 }
254 month += ELUL+1;
255 --year;
256 acrossAdar1 = TRUE;
257 }
258 }
259 set(UCAL_MONTH, month);
260 set(UCAL_YEAR, year);
261 pinField(UCAL_DAY_OF_MONTH, status);
262 break;
263 }
264
265 default:
266 Calendar::add(field, amount, status);
267 break;
268 }
269}
270
271/**
272* @deprecated ICU 2.6 use UCalendarDateFields instead of EDateFields
273*/
274void HebrewCalendar::add(EDateFields field, int32_t amount, UErrorCode& status)
275{
276 add((UCalendarDateFields)field, amount, status);
277}
278
279/**
280* Rolls (up/down) a specified amount time on the given field. For
281* example, to roll the current date up by three days, you can call
282* <code>roll(Calendar.DATE, 3)</code>. If the
283* field is rolled past its maximum allowable value, it will "wrap" back
284* to its minimum and continue rolling.
285* For example, calling <code>roll(Calendar.DATE, 10)</code>
286* on a Hebrew calendar set to "25 Av 5758" will result in the date "5 Av 5758".
287* <p>
288* When rolling certain fields, the values of other fields may conflict and
289* need to be changed. For example, when rolling the {@link #MONTH MONTH} field
290* upward by one for the date "30 Av 5758", the {@link #DAY_OF_MONTH DAY_OF_MONTH} field
291* must be adjusted so that the result is "29 Elul 5758" rather than the invalid
292* "30 Elul".
293* <p>
294* This method is able to roll
295* all fields except for {@link #ERA ERA}, {@link #DST_OFFSET DST_OFFSET},
296* and {@link #ZONE_OFFSET ZONE_OFFSET}. Subclasses may, of course, add support for
297* additional fields in their overrides of <code>roll</code>.
298* <p>
299* <b>Note:</b> You should always use roll and {@link #add add} rather
300* than attempting to perform arithmetic operations directly on the fields
301* of a <tt>HebrewCalendar</tt>. Since the {@link #MONTH MONTH} field behaves
302* discontinuously in non-leap years, simple arithmetic can give invalid results.
303* <p>
304* @param field the time field.
305* @param amount the amount by which the field should be rolled.
306*
307* @exception IllegalArgumentException if the field is invalid or refers
308* to a field that cannot be handled by this method.
309* @internal
310*/
311void HebrewCalendar::roll(UCalendarDateFields field, int32_t amount, UErrorCode& status)
312{
313 if(U_FAILURE(status)) {
314 return;
315 }
316 switch (field) {
317 case UCAL_MONTH:
318 {
319 int32_t month = get(UCAL_MONTH, status);
320 int32_t year = get(UCAL_YEAR, status);
321
322 UBool leapYear = isLeapYear(year);
323 int32_t yearLength = monthsInYear(year);
324 int32_t newMonth = month + (amount % yearLength);
325 //
326 // If it's not a leap year and we're rolling past the missing month
327 // of ADAR_1, we need to roll an extra month to make up for it.
328 //
329 if (!leapYear) {
330 if (amount > 0 && month < ADAR_1 && newMonth >= ADAR_1) {
331 newMonth++;
332 } else if (amount < 0 && month > ADAR_1 && newMonth <= ADAR_1) {
333 newMonth--;
334 }
335 }
336 set(UCAL_MONTH, (newMonth + 13) % 13);
337 pinField(UCAL_DAY_OF_MONTH, status);
338 return;
339 }
340 default:
341 Calendar::roll(field, amount, status);
342 }
343}
344
345void HebrewCalendar::roll(EDateFields field, int32_t amount, UErrorCode& status) {
346 roll((UCalendarDateFields)field, amount, status);
347}
348
349//-------------------------------------------------------------------------
350// Support methods
351//-------------------------------------------------------------------------
352
353// Hebrew date calculations are performed in terms of days, hours, and
354// "parts" (or halakim), which are 1/1080 of an hour, or 3 1/3 seconds.
355static const int32_t HOUR_PARTS = 1080;
356static const int32_t DAY_PARTS = 24*HOUR_PARTS;
357
358// An approximate value for the length of a lunar month.
359// It is used to calculate the approximate year and month of a given
360// absolute date.
361static const int32_t MONTH_DAYS = 29;
362static const int32_t MONTH_FRACT = 12*HOUR_PARTS + 793;
363static const int32_t MONTH_PARTS = MONTH_DAYS*DAY_PARTS + MONTH_FRACT;
364
365// The time of the new moon (in parts) on 1 Tishri, year 1 (the epoch)
366// counting from noon on the day before. BAHARAD is an abbreviation of
367// Bet (Monday), Hey (5 hours from sunset), Resh-Daled (204).
368static const int32_t BAHARAD = 11*HOUR_PARTS + 204;
369
370/**
371* Finds the day # of the first day in the given Hebrew year.
372* To do this, we want to calculate the time of the Tishri 1 new moon
373* in that year.
374* <p>
375* The algorithm here is similar to ones described in a number of
376* references, including:
377* <ul>
378* <li>"Calendrical Calculations", by Nachum Dershowitz & Edward Reingold,
379* Cambridge University Press, 1997, pages 85-91.
380*
381* <li>Hebrew Calendar Science and Myths,
382* <a href="http://www.geocities.com/Athens/1584/">
383* http://www.geocities.com/Athens/1584/</a>
384*
385* <li>The Calendar FAQ,
386* <a href="http://www.faqs.org/faqs/calendars/faq/">
387* http://www.faqs.org/faqs/calendars/faq/</a>
388* </ul>
389*/
390int32_t HebrewCalendar::startOfYear(int32_t year, UErrorCode &status)
391{
392 ucln_i18n_registerCleanup(UCLN_I18N_HEBREW_CALENDAR, calendar_hebrew_cleanup);
393 int32_t day = CalendarCache::get(&gCache, year, status);
394
395 if (day == 0) {
396 int32_t months = (235 * year - 234) / 19; // # of months before year
397
398 int64_t frac = (int64_t)months * MONTH_FRACT + BAHARAD; // Fractional part of day #
399 day = months * 29 + (int32_t)(frac / DAY_PARTS); // Whole # part of calculation
400 frac = frac % DAY_PARTS; // Time of day
401
402 int32_t wd = (day % 7); // Day of week (0 == Monday)
403
404 if (wd == 2 || wd == 4 || wd == 6) {
405 // If the 1st is on Sun, Wed, or Fri, postpone to the next day
406 day += 1;
407 wd = (day % 7);
408 }
409 if (wd == 1 && frac > 15*HOUR_PARTS+204 && !isLeapYear(year) ) {
410 // If the new moon falls after 3:11:20am (15h204p from the previous noon)
411 // on a Tuesday and it is not a leap year, postpone by 2 days.
412 // This prevents 356-day years.
413 day += 2;
414 }
415 else if (wd == 0 && frac > 21*HOUR_PARTS+589 && isLeapYear(year-1) ) {
416 // If the new moon falls after 9:32:43 1/3am (21h589p from yesterday noon)
417 // on a Monday and *last* year was a leap year, postpone by 1 day.
418 // Prevents 382-day years.
419 day += 1;
420 }
421 CalendarCache::put(&gCache, year, day, status);
422 }
423 return day;
424}
425
426/**
427* Find the day of the week for a given day
428*
429* @param day The # of days since the start of the Hebrew calendar,
430* 1-based (i.e. 1/1/1 AM is day 1).
431*/
432int32_t HebrewCalendar::absoluteDayToDayOfWeek(int32_t day)
433{
434 // We know that 1/1/1 AM is a Monday, which makes the math easy...
435 return (day % 7) + 1;
436}
437
438/**
439* Returns the the type of a given year.
440* 0 "Deficient" year with 353 or 383 days
441* 1 "Normal" year with 354 or 384 days
442* 2 "Complete" year with 355 or 385 days
443*/
444int32_t HebrewCalendar::yearType(int32_t year) const
445{
446 int32_t yearLength = handleGetYearLength(year);
447
448 if (yearLength > 380) {
449 yearLength -= 30; // Subtract length of leap month.
450 }
451
452 int type = 0;
453
454 switch (yearLength) {
455 case 353:
456 type = 0; break;
457 case 354:
458 type = 1; break;
459 case 355:
460 type = 2; break;
461 default:
462 //throw new RuntimeException("Illegal year length " + yearLength + " in year " + year);
463 type = 1;
464 }
465 return type;
466}
467
468/**
469* Determine whether a given Hebrew year is a leap year
470*
471* The rule here is that if (year % 19) == 0, 3, 6, 8, 11, 14, or 17.
472* The formula below performs the same test, believe it or not.
473*/
474UBool HebrewCalendar::isLeapYear(int32_t year) {
475 //return (year * 12 + 17) % 19 >= 12;
476 int32_t x = (year*12 + 17) % 19;
477 return x >= ((x < 0) ? -7 : 12);
478}
479
480int32_t HebrewCalendar::monthsInYear(int32_t year) {
481 return isLeapYear(year) ? 13 : 12;
482}
483
484//-------------------------------------------------------------------------
485// Calendar framework
486//-------------------------------------------------------------------------
487
488/**
489* @internal
490*/
491int32_t HebrewCalendar::handleGetLimit(UCalendarDateFields field, ELimitType limitType) const {
492 return LIMITS[field][limitType];
493}
494
495/**
496* Returns the length of the given month in the given year
497* @internal
498*/
499int32_t HebrewCalendar::handleGetMonthLength(int32_t extendedYear, int32_t month) const {
500 // Resolve out-of-range months. This is necessary in order to
501 // obtain the correct year. We correct to
502 // a 12- or 13-month year (add/subtract 12 or 13, depending
503 // on the year) but since we _always_ number from 0..12, and
504 // the leap year determines whether or not month 5 (Adar 1)
505 // is present, we allow 0..12 in any given year.
506 while (month < 0) {
507 month += monthsInYear(--extendedYear);
508 }
509 // Careful: allow 0..12 in all years
510 while (month > 12) {
511 month -= monthsInYear(extendedYear++);
512 }
513
514 switch (month) {
515 case HESHVAN:
516 case KISLEV:
517 // These two month lengths can vary
518 return MONTH_LENGTH[month][yearType(extendedYear)];
519
520 default:
521 // The rest are a fixed length
522 return MONTH_LENGTH[month][0];
523 }
524}
525
526/**
527* Returns the number of days in the given Hebrew year
528* @internal
529*/
530int32_t HebrewCalendar::handleGetYearLength(int32_t eyear) const {
531 UErrorCode status = U_ZERO_ERROR;
532 return startOfYear(eyear+1, status) - startOfYear(eyear, status);
533}
534
535void HebrewCalendar::validateField(UCalendarDateFields field, UErrorCode &status) {
536 if (field == UCAL_MONTH && !isLeapYear(handleGetExtendedYear()) && internalGet(UCAL_MONTH) == ADAR_1) {
537 status = U_ILLEGAL_ARGUMENT_ERROR;
538 return;
539 }
540 Calendar::validateField(field, status);
541}
542//-------------------------------------------------------------------------
543// Functions for converting from milliseconds to field values
544//-------------------------------------------------------------------------
545
546/**
547* Subclasses may override this method to compute several fields
548* specific to each calendar system. These are:
549*
550* <ul><li>ERA
551* <li>YEAR
552* <li>MONTH
553* <li>DAY_OF_MONTH
554* <li>DAY_OF_YEAR
555* <li>EXTENDED_YEAR</ul>
556*
557* Subclasses can refer to the DAY_OF_WEEK and DOW_LOCAL fields,
558* which will be set when this method is called. Subclasses can
559* also call the getGregorianXxx() methods to obtain Gregorian
560* calendar equivalents for the given Julian day.
561*
562* <p>In addition, subclasses should compute any subclass-specific
563* fields, that is, fields from BASE_FIELD_COUNT to
564* getFieldCount() - 1.
565* @internal
566*/
567void HebrewCalendar::handleComputeFields(int32_t julianDay, UErrorCode &status) {
568 int32_t d = julianDay - 347997;
569 double m = ((d * (double)DAY_PARTS)/ (double) MONTH_PARTS); // Months (approx)
570 int32_t year = (int32_t)( ((19. * m + 234.) / 235.) + 1.); // Years (approx)
571 int32_t ys = startOfYear(year, status); // 1st day of year
572 int32_t dayOfYear = (d - ys);
573
574 // Because of the postponement rules, it's possible to guess wrong. Fix it.
575 while (dayOfYear < 1) {
576 year--;
577 ys = startOfYear(year, status);
578 dayOfYear = (d - ys);
579 }
580
581 // Now figure out which month we're in, and the date within that month
582 int32_t type = yearType(year);
583 UBool isLeap = isLeapYear(year);
584
585 int32_t month = 0;
586 int32_t momax = UPRV_LENGTHOF(MONTH_START);
587 while (month < momax && dayOfYear > ( isLeap ? LEAP_MONTH_START[month][type] : MONTH_START[month][type] ) ) {
588 month++;
589 }
590 if (month >= momax || month<=0) {
591 // TODO: I found dayOfYear could be out of range when
592 // a large value is set to julianDay. I patched startOfYear
593 // to reduce the chace, but it could be still reproduced either
594 // by startOfYear or other places. For now, we check
595 // the month is in valid range to avoid out of array index
596 // access problem here. However, we need to carefully review
597 // the calendar implementation to check the extreme limit of
598 // each calendar field and the code works well for any values
599 // in the valid value range. -yoshito
600 status = U_ILLEGAL_ARGUMENT_ERROR;
601 return;
602 }
603 month--;
604 int dayOfMonth = dayOfYear - (isLeap ? LEAP_MONTH_START[month][type] : MONTH_START[month][type]);
605
606 internalSet(UCAL_ERA, 0);
607 internalSet(UCAL_YEAR, year);
608 internalSet(UCAL_EXTENDED_YEAR, year);
609 internalSet(UCAL_MONTH, month);
610 internalSet(UCAL_DAY_OF_MONTH, dayOfMonth);
611 internalSet(UCAL_DAY_OF_YEAR, dayOfYear);
612}
613
614//-------------------------------------------------------------------------
615// Functions for converting from field values to milliseconds
616//-------------------------------------------------------------------------
617
618/**
619* @internal
620*/
621int32_t HebrewCalendar::handleGetExtendedYear() {
622 int32_t year;
623 if (newerField(UCAL_EXTENDED_YEAR, UCAL_YEAR) == UCAL_EXTENDED_YEAR) {
624 year = internalGet(UCAL_EXTENDED_YEAR, 1); // Default to year 1
625 } else {
626 year = internalGet(UCAL_YEAR, 1); // Default to year 1
627 }
628 return year;
629}
630
631/**
632* Return JD of start of given month/year.
633* @internal
634*/
635int32_t HebrewCalendar::handleComputeMonthStart(int32_t eyear, int32_t month, UBool /*useMonth*/) const {
636 UErrorCode status = U_ZERO_ERROR;
637 // Resolve out-of-range months. This is necessary in order to
638 // obtain the correct year. We correct to
639 // a 12- or 13-month year (add/subtract 12 or 13, depending
640 // on the year) but since we _always_ number from 0..12, and
641 // the leap year determines whether or not month 5 (Adar 1)
642 // is present, we allow 0..12 in any given year.
643 while (month < 0) {
644 month += monthsInYear(--eyear);
645 }
646 // Careful: allow 0..12 in all years
647 while (month > 12) {
648 month -= monthsInYear(eyear++);
649 }
650
651 int32_t day = startOfYear(eyear, status);
652
653 if(U_FAILURE(status)) {
654 return 0;
655 }
656
657 if (month != 0) {
658 if (isLeapYear(eyear)) {
659 day += LEAP_MONTH_START[month][yearType(eyear)];
660 } else {
661 day += MONTH_START[month][yearType(eyear)];
662 }
663 }
664
665 return (int) (day + 347997);
666}
667
668UBool
669HebrewCalendar::inDaylightTime(UErrorCode& status) const
670{
671 // copied from GregorianCalendar
672 if (U_FAILURE(status) || !getTimeZone().useDaylightTime())
673 return FALSE;
674
675 // Force an update of the state of the Calendar.
676 ((HebrewCalendar*)this)->complete(status); // cast away const
677
678 return (UBool)(U_SUCCESS(status) ? (internalGet(UCAL_DST_OFFSET) != 0) : FALSE);
679}
680
681/**
682 * The system maintains a static default century start date and Year. They are
683 * initialized the first time they are used. Once the system default century date
684 * and year are set, they do not change.
685 */
686static UDate gSystemDefaultCenturyStart = DBL_MIN;
687static int32_t gSystemDefaultCenturyStartYear = -1;
688static icu::UInitOnce gSystemDefaultCenturyInit = U_INITONCE_INITIALIZER;
689
690UBool HebrewCalendar::haveDefaultCentury() const
691{
692 return TRUE;
693}
694
695static void U_CALLCONV initializeSystemDefaultCentury()
696{
697 // initialize systemDefaultCentury and systemDefaultCenturyYear based
698 // on the current time. They'll be set to 80 years before
699 // the current time.
700 UErrorCode status = U_ZERO_ERROR;
701 HebrewCalendar calendar(Locale("@calendar=hebrew"),status);
702 if (U_SUCCESS(status)) {
703 calendar.setTime(Calendar::getNow(), status);
704 calendar.add(UCAL_YEAR, -80, status);
705
706 gSystemDefaultCenturyStart = calendar.getTime(status);
707 gSystemDefaultCenturyStartYear = calendar.get(UCAL_YEAR, status);
708 }
709 // We have no recourse upon failure unless we want to propagate the failure
710 // out.
711}
712
713
714UDate HebrewCalendar::defaultCenturyStart() const {
715 // lazy-evaluate systemDefaultCenturyStart
716 umtx_initOnce(gSystemDefaultCenturyInit, &initializeSystemDefaultCentury);
717 return gSystemDefaultCenturyStart;
718}
719
720int32_t HebrewCalendar::defaultCenturyStartYear() const {
721 // lazy-evaluate systemDefaultCenturyStartYear
722 umtx_initOnce(gSystemDefaultCenturyInit, &initializeSystemDefaultCentury);
723 return gSystemDefaultCenturyStartYear;
724}
725
726
727UOBJECT_DEFINE_RTTI_IMPLEMENTATION(HebrewCalendar)
728
729U_NAMESPACE_END
730
731#endif // UCONFIG_NO_FORMATTING
732
733