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intl/icu/source/i18n/hebrwcal.cpp

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1 /*
2 ******************************************************************************
3 * Copyright (C) 2003-2013, International Business Machines Corporation
4 * and others. All Rights Reserved.
5 ******************************************************************************
6 *
7 * File HEBRWCAL.CPP
8 *
9 * Modification History:
10 *
11 * Date Name Description
12 * 12/03/2003 srl ported from java HebrewCalendar
13 *****************************************************************************
14 */
15
16 #include "hebrwcal.h"
17
18 #if !UCONFIG_NO_FORMATTING
19
20 #include "umutex.h"
21 #include <float.h>
22 #include "gregoimp.h" // Math
23 #include "astro.h" // CalendarAstronomer
24 #include "uhash.h"
25 #include "ucln_in.h"
26
27 // Hebrew Calendar implementation
28
29 /**
30 * The absolute date, in milliseconds since 1/1/1970 AD, Gregorian,
31 * of the start of the Hebrew calendar. In order to keep this calendar's
32 * time of day in sync with that of the Gregorian calendar, we use
33 * midnight, rather than sunset the day before.
34 */
35 //static const double EPOCH_MILLIS = -180799862400000.; // 1/1/1 HY
36
37 static const int32_t LIMITS[UCAL_FIELD_COUNT][4] = {
38 // Minimum Greatest Least Maximum
39 // Minimum Maximum
40 { 0, 0, 0, 0}, // ERA
41 { -5000000, -5000000, 5000000, 5000000}, // YEAR
42 { 0, 0, 12, 12}, // MONTH
43 { 1, 1, 51, 56}, // WEEK_OF_YEAR
44 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // WEEK_OF_MONTH
45 { 1, 1, 29, 30}, // DAY_OF_MONTH
46 { 1, 1, 353, 385}, // DAY_OF_YEAR
47 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // DAY_OF_WEEK
48 { -1, -1, 5, 5}, // DAY_OF_WEEK_IN_MONTH
49 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // AM_PM
50 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // HOUR
51 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // HOUR_OF_DAY
52 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // MINUTE
53 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // SECOND
54 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // MILLISECOND
55 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // ZONE_OFFSET
56 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // DST_OFFSET
57 { -5000000, -5000000, 5000000, 5000000}, // YEAR_WOY
58 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // DOW_LOCAL
59 { -5000000, -5000000, 5000000, 5000000}, // EXTENDED_YEAR
60 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // JULIAN_DAY
61 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // MILLISECONDS_IN_DAY
62 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // IS_LEAP_MONTH
63 };
64
65 /**
66 * The lengths of the Hebrew months. This is complicated, because there
67 * are three different types of years, or six if you count leap years.
68 * Due to the rules for postponing the start of the year to avoid having
69 * certain holidays fall on the sabbath, the year can end up being three
70 * different lengths, called "deficient", "normal", and "complete".
71 */
72 static const int8_t MONTH_LENGTH[][3] = {
73 // Deficient Normal Complete
74 { 30, 30, 30 }, //Tishri
75 { 29, 29, 30 }, //Heshvan
76 { 29, 30, 30 }, //Kislev
77 { 29, 29, 29 }, //Tevet
78 { 30, 30, 30 }, //Shevat
79 { 30, 30, 30 }, //Adar I (leap years only)
80 { 29, 29, 29 }, //Adar
81 { 30, 30, 30 }, //Nisan
82 { 29, 29, 29 }, //Iyar
83 { 30, 30, 30 }, //Sivan
84 { 29, 29, 29 }, //Tammuz
85 { 30, 30, 30 }, //Av
86 { 29, 29, 29 }, //Elul
87 };
88
89 /**
90 * The cumulative # of days to the end of each month in a non-leap year
91 * Although this can be calculated from the MONTH_LENGTH table,
92 * keeping it around separately makes some calculations a lot faster
93 */
94
95 static const int16_t MONTH_START[][3] = {
96 // Deficient Normal Complete
97 { 0, 0, 0 }, // (placeholder)
98 { 30, 30, 30 }, // Tishri
99 { 59, 59, 60 }, // Heshvan
100 { 88, 89, 90 }, // Kislev
101 { 117, 118, 119 }, // Tevet
102 { 147, 148, 149 }, // Shevat
103 { 147, 148, 149 }, // (Adar I placeholder)
104 { 176, 177, 178 }, // Adar
105 { 206, 207, 208 }, // Nisan
106 { 235, 236, 237 }, // Iyar
107 { 265, 266, 267 }, // Sivan
108 { 294, 295, 296 }, // Tammuz
109 { 324, 325, 326 }, // Av
110 { 353, 354, 355 }, // Elul
111 };
112
113 /**
114 * The cumulative # of days to the end of each month in a leap year
115 */
116 static const int16_t LEAP_MONTH_START[][3] = {
117 // Deficient Normal Complete
118 { 0, 0, 0 }, // (placeholder)
119 { 30, 30, 30 }, // Tishri
120 { 59, 59, 60 }, // Heshvan
121 { 88, 89, 90 }, // Kislev
122 { 117, 118, 119 }, // Tevet
123 { 147, 148, 149 }, // Shevat
124 { 177, 178, 179 }, // Adar I
125 { 206, 207, 208 }, // Adar II
126 { 236, 237, 238 }, // Nisan
127 { 265, 266, 267 }, // Iyar
128 { 295, 296, 297 }, // Sivan
129 { 324, 325, 326 }, // Tammuz
130 { 354, 355, 356 }, // Av
131 { 383, 384, 385 }, // Elul
132 };
133
134 static icu::CalendarCache *gCache = NULL;
135
136 U_CDECL_BEGIN
137 static UBool calendar_hebrew_cleanup(void) {
138 delete gCache;
139 gCache = NULL;
140 return TRUE;
141 }
142 U_CDECL_END
143
144 U_NAMESPACE_BEGIN
145 //-------------------------------------------------------------------------
146 // Constructors...
147 //-------------------------------------------------------------------------
148
149 /**
150 * Constructs a default <code>HebrewCalendar</code> using the current time
151 * in the default time zone with the default locale.
152 * @internal
153 */
154 HebrewCalendar::HebrewCalendar(const Locale& aLocale, UErrorCode& success)
155 : Calendar(TimeZone::createDefault(), aLocale, success)
156
157 {
158 setTimeInMillis(getNow(), success); // Call this again now that the vtable is set up properly.
159 }
160
161
162 HebrewCalendar::~HebrewCalendar() {
163 }
164
165 const char *HebrewCalendar::getType() const {
166 return "hebrew";
167 }
168
169 Calendar* HebrewCalendar::clone() const {
170 return new HebrewCalendar(*this);
171 }
172
173 HebrewCalendar::HebrewCalendar(const HebrewCalendar& other) : Calendar(other) {
174 }
175
176
177 //-------------------------------------------------------------------------
178 // Rolling and adding functions overridden from Calendar
179 //
180 // These methods call through to the default implementation in IBMCalendar
181 // for most of the fields and only handle the unusual ones themselves.
182 //-------------------------------------------------------------------------
183
184 /**
185 * Add a signed amount to a specified field, using this calendar's rules.
186 * For example, to add three days to the current date, you can call
187 * <code>add(Calendar.DATE, 3)</code>.
188 * <p>
189 * When adding to certain fields, the values of other fields may conflict and
190 * need to be changed. For example, when adding one to the {@link #MONTH MONTH} field
191 * for the date "30 Av 5758", the {@link #DAY_OF_MONTH DAY_OF_MONTH} field
192 * must be adjusted so that the result is "29 Elul 5758" rather than the invalid
193 * "30 Elul 5758".
194 * <p>
195 * This method is able to add to
196 * all fields except for {@link #ERA ERA}, {@link #DST_OFFSET DST_OFFSET},
197 * and {@link #ZONE_OFFSET ZONE_OFFSET}.
198 * <p>
199 * <b>Note:</b> You should always use {@link #roll roll} and add rather
200 * than attempting to perform arithmetic operations directly on the fields
201 * of a <tt>HebrewCalendar</tt>. Since the {@link #MONTH MONTH} field behaves
202 * discontinuously in non-leap years, simple arithmetic can give invalid results.
203 * <p>
204 * @param field the time field.
205 * @param amount the amount to add to the field.
206 *
207 * @exception IllegalArgumentException if the field is invalid or refers
208 * to a field that cannot be handled by this method.
209 * @internal
210 */
211 void HebrewCalendar::add(UCalendarDateFields field, int32_t amount, UErrorCode& status)
212 {
213 if(U_FAILURE(status)) {
214 return;
215 }
216 switch (field) {
217 case UCAL_MONTH:
218 {
219 // We can't just do a set(MONTH, get(MONTH) + amount). The
220 // reason is ADAR_1. Suppose amount is +2 and we land in
221 // ADAR_1 -- then we have to bump to ADAR_2 aka ADAR. But
222 // if amount is -2 and we land in ADAR_1, then we have to
223 // bump the other way -- down to SHEVAT. - Alan 11/00
224 int32_t month = get(UCAL_MONTH, status);
225 int32_t year = get(UCAL_YEAR, status);
226 UBool acrossAdar1;
227 if (amount > 0) {
228 acrossAdar1 = (month < ADAR_1); // started before ADAR_1?
229 month += amount;
230 for (;;) {
231 if (acrossAdar1 && month>=ADAR_1 && !isLeapYear(year)) {
232 ++month;
233 }
234 if (month <= ELUL) {
235 break;
236 }
237 month -= ELUL+1;
238 ++year;
239 acrossAdar1 = TRUE;
240 }
241 } else {
242 acrossAdar1 = (month > ADAR_1); // started after ADAR_1?
243 month += amount;
244 for (;;) {
245 if (acrossAdar1 && month<=ADAR_1 && !isLeapYear(year)) {
246 --month;
247 }
248 if (month >= 0) {
249 break;
250 }
251 month += ELUL+1;
252 --year;
253 acrossAdar1 = TRUE;
254 }
255 }
256 set(UCAL_MONTH, month);
257 set(UCAL_YEAR, year);
258 pinField(UCAL_DAY_OF_MONTH, status);
259 break;
260 }
261
262 default:
263 Calendar::add(field, amount, status);
264 break;
265 }
266 }
267
268 /**
269 * @deprecated ICU 2.6 use UCalendarDateFields instead of EDateFields
270 */
271 void HebrewCalendar::add(EDateFields field, int32_t amount, UErrorCode& status)
272 {
273 add((UCalendarDateFields)field, amount, status);
274 }
275
276 /**
277 * Rolls (up/down) a specified amount time on the given field. For
278 * example, to roll the current date up by three days, you can call
279 * <code>roll(Calendar.DATE, 3)</code>. If the
280 * field is rolled past its maximum allowable value, it will "wrap" back
281 * to its minimum and continue rolling.
282 * For example, calling <code>roll(Calendar.DATE, 10)</code>
283 * on a Hebrew calendar set to "25 Av 5758" will result in the date "5 Av 5758".
284 * <p>
285 * When rolling certain fields, the values of other fields may conflict and
286 * need to be changed. For example, when rolling the {@link #MONTH MONTH} field
287 * upward by one for the date "30 Av 5758", the {@link #DAY_OF_MONTH DAY_OF_MONTH} field
288 * must be adjusted so that the result is "29 Elul 5758" rather than the invalid
289 * "30 Elul".
290 * <p>
291 * This method is able to roll
292 * all fields except for {@link #ERA ERA}, {@link #DST_OFFSET DST_OFFSET},
293 * and {@link #ZONE_OFFSET ZONE_OFFSET}. Subclasses may, of course, add support for
294 * additional fields in their overrides of <code>roll</code>.
295 * <p>
296 * <b>Note:</b> You should always use roll and {@link #add add} rather
297 * than attempting to perform arithmetic operations directly on the fields
298 * of a <tt>HebrewCalendar</tt>. Since the {@link #MONTH MONTH} field behaves
299 * discontinuously in non-leap years, simple arithmetic can give invalid results.
300 * <p>
301 * @param field the time field.
302 * @param amount the amount by which the field should be rolled.
303 *
304 * @exception IllegalArgumentException if the field is invalid or refers
305 * to a field that cannot be handled by this method.
306 * @internal
307 */
308 void HebrewCalendar::roll(UCalendarDateFields field, int32_t amount, UErrorCode& status)
309 {
310 if(U_FAILURE(status)) {
311 return;
312 }
313 switch (field) {
314 case UCAL_MONTH:
315 {
316 int32_t month = get(UCAL_MONTH, status);
317 int32_t year = get(UCAL_YEAR, status);
318
319 UBool leapYear = isLeapYear(year);
320 int32_t yearLength = monthsInYear(year);
321 int32_t newMonth = month + (amount % yearLength);
322 //
323 // If it's not a leap year and we're rolling past the missing month
324 // of ADAR_1, we need to roll an extra month to make up for it.
325 //
326 if (!leapYear) {
327 if (amount > 0 && month < ADAR_1 && newMonth >= ADAR_1) {
328 newMonth++;
329 } else if (amount < 0 && month > ADAR_1 && newMonth <= ADAR_1) {
330 newMonth--;
331 }
332 }
333 set(UCAL_MONTH, (newMonth + 13) % 13);
334 pinField(UCAL_DAY_OF_MONTH, status);
335 return;
336 }
337 default:
338 Calendar::roll(field, amount, status);
339 }
340 }
341
342 void HebrewCalendar::roll(EDateFields field, int32_t amount, UErrorCode& status) {
343 roll((UCalendarDateFields)field, amount, status);
344 }
345
346 //-------------------------------------------------------------------------
347 // Support methods
348 //-------------------------------------------------------------------------
349
350 // Hebrew date calculations are performed in terms of days, hours, and
351 // "parts" (or halakim), which are 1/1080 of an hour, or 3 1/3 seconds.
352 static const int32_t HOUR_PARTS = 1080;
353 static const int32_t DAY_PARTS = 24*HOUR_PARTS;
354
355 // An approximate value for the length of a lunar month.
356 // It is used to calculate the approximate year and month of a given
357 // absolute date.
358 static const int32_t MONTH_DAYS = 29;
359 static const int32_t MONTH_FRACT = 12*HOUR_PARTS + 793;
360 static const int32_t MONTH_PARTS = MONTH_DAYS*DAY_PARTS + MONTH_FRACT;
361
362 // The time of the new moon (in parts) on 1 Tishri, year 1 (the epoch)
363 // counting from noon on the day before. BAHARAD is an abbreviation of
364 // Bet (Monday), Hey (5 hours from sunset), Resh-Daled (204).
365 static const int32_t BAHARAD = 11*HOUR_PARTS + 204;
366
367 /**
368 * Finds the day # of the first day in the given Hebrew year.
369 * To do this, we want to calculate the time of the Tishri 1 new moon
370 * in that year.
371 * <p>
372 * The algorithm here is similar to ones described in a number of
373 * references, including:
374 * <ul>
375 * <li>"Calendrical Calculations", by Nachum Dershowitz & Edward Reingold,
376 * Cambridge University Press, 1997, pages 85-91.
377 *
378 * <li>Hebrew Calendar Science and Myths,
379 * <a href="http://www.geocities.com/Athens/1584/">
380 * http://www.geocities.com/Athens/1584/</a>
381 *
382 * <li>The Calendar FAQ,
383 * <a href="http://www.faqs.org/faqs/calendars/faq/">
384 * http://www.faqs.org/faqs/calendars/faq/</a>
385 * </ul>
386 */
387 int32_t HebrewCalendar::startOfYear(int32_t year, UErrorCode &status)
388 {
389 ucln_i18n_registerCleanup(UCLN_I18N_HEBREW_CALENDAR, calendar_hebrew_cleanup);
390 int32_t day = CalendarCache::get(&gCache, year, status);
391
392 if (day == 0) {
393 int32_t months = (235 * year - 234) / 19; // # of months before year
394
395 int64_t frac = (int64_t)months * MONTH_FRACT + BAHARAD; // Fractional part of day #
396 day = months * 29 + (int32_t)(frac / DAY_PARTS); // Whole # part of calculation
397 frac = frac % DAY_PARTS; // Time of day
398
399 int32_t wd = (day % 7); // Day of week (0 == Monday)
400
401 if (wd == 2 || wd == 4 || wd == 6) {
402 // If the 1st is on Sun, Wed, or Fri, postpone to the next day
403 day += 1;
404 wd = (day % 7);
405 }
406 if (wd == 1 && frac > 15*HOUR_PARTS+204 && !isLeapYear(year) ) {
407 // If the new moon falls after 3:11:20am (15h204p from the previous noon)
408 // on a Tuesday and it is not a leap year, postpone by 2 days.
409 // This prevents 356-day years.
410 day += 2;
411 }
412 else if (wd == 0 && frac > 21*HOUR_PARTS+589 && isLeapYear(year-1) ) {
413 // If the new moon falls after 9:32:43 1/3am (21h589p from yesterday noon)
414 // on a Monday and *last* year was a leap year, postpone by 1 day.
415 // Prevents 382-day years.
416 day += 1;
417 }
418 CalendarCache::put(&gCache, year, day, status);
419 }
420 return day;
421 }
422
423 /**
424 * Find the day of the week for a given day
425 *
426 * @param day The # of days since the start of the Hebrew calendar,
427 * 1-based (i.e. 1/1/1 AM is day 1).
428 */
429 int32_t HebrewCalendar::absoluteDayToDayOfWeek(int32_t day)
430 {
431 // We know that 1/1/1 AM is a Monday, which makes the math easy...
432 return (day % 7) + 1;
433 }
434
435 /**
436 * Returns the the type of a given year.
437 * 0 "Deficient" year with 353 or 383 days
438 * 1 "Normal" year with 354 or 384 days
439 * 2 "Complete" year with 355 or 385 days
440 */
441 int32_t HebrewCalendar::yearType(int32_t year) const
442 {
443 int32_t yearLength = handleGetYearLength(year);
444
445 if (yearLength > 380) {
446 yearLength -= 30; // Subtract length of leap month.
447 }
448
449 int type = 0;
450
451 switch (yearLength) {
452 case 353:
453 type = 0; break;
454 case 354:
455 type = 1; break;
456 case 355:
457 type = 2; break;
458 default:
459 //throw new RuntimeException("Illegal year length " + yearLength + " in year " + year);
460 type = 1;
461 }
462 return type;
463 }
464
465 /**
466 * Determine whether a given Hebrew year is a leap year
467 *
468 * The rule here is that if (year % 19) == 0, 3, 6, 8, 11, 14, or 17.
469 * The formula below performs the same test, believe it or not.
470 */
471 UBool HebrewCalendar::isLeapYear(int32_t year) {
472 //return (year * 12 + 17) % 19 >= 12;
473 int32_t x = (year*12 + 17) % 19;
474 return x >= ((x < 0) ? -7 : 12);
475 }
476
477 int32_t HebrewCalendar::monthsInYear(int32_t year) {
478 return isLeapYear(year) ? 13 : 12;
479 }
480
481 //-------------------------------------------------------------------------
482 // Calendar framework
483 //-------------------------------------------------------------------------
484
485 /**
486 * @internal
487 */
488 int32_t HebrewCalendar::handleGetLimit(UCalendarDateFields field, ELimitType limitType) const {
489 return LIMITS[field][limitType];
490 }
491
492 /**
493 * Returns the length of the given month in the given year
494 * @internal
495 */
496 int32_t HebrewCalendar::handleGetMonthLength(int32_t extendedYear, int32_t month) const {
497 // Resolve out-of-range months. This is necessary in order to
498 // obtain the correct year. We correct to
499 // a 12- or 13-month year (add/subtract 12 or 13, depending
500 // on the year) but since we _always_ number from 0..12, and
501 // the leap year determines whether or not month 5 (Adar 1)
502 // is present, we allow 0..12 in any given year.
503 while (month < 0) {
504 month += monthsInYear(--extendedYear);
505 }
506 // Careful: allow 0..12 in all years
507 while (month > 12) {
508 month -= monthsInYear(extendedYear++);
509 }
510
511 switch (month) {
512 case HESHVAN:
513 case KISLEV:
514 // These two month lengths can vary
515 return MONTH_LENGTH[month][yearType(extendedYear)];
516
517 default:
518 // The rest are a fixed length
519 return MONTH_LENGTH[month][0];
520 }
521 }
522
523 /**
524 * Returns the number of days in the given Hebrew year
525 * @internal
526 */
527 int32_t HebrewCalendar::handleGetYearLength(int32_t eyear) const {
528 UErrorCode status = U_ZERO_ERROR;
529 return startOfYear(eyear+1, status) - startOfYear(eyear, status);
530 }
531
532 //-------------------------------------------------------------------------
533 // Functions for converting from milliseconds to field values
534 //-------------------------------------------------------------------------
535
536 /**
537 * Subclasses may override this method to compute several fields
538 * specific to each calendar system. These are:
539 *
540 * <ul><li>ERA
541 * <li>YEAR
542 * <li>MONTH
543 * <li>DAY_OF_MONTH
544 * <li>DAY_OF_YEAR
545 * <li>EXTENDED_YEAR</ul>
546 *
547 * Subclasses can refer to the DAY_OF_WEEK and DOW_LOCAL fields,
548 * which will be set when this method is called. Subclasses can
549 * also call the getGregorianXxx() methods to obtain Gregorian
550 * calendar equivalents for the given Julian day.
551 *
552 * <p>In addition, subclasses should compute any subclass-specific
553 * fields, that is, fields from BASE_FIELD_COUNT to
554 * getFieldCount() - 1.
555 * @internal
556 */
557 void HebrewCalendar::handleComputeFields(int32_t julianDay, UErrorCode &status) {
558 int32_t d = julianDay - 347997;
559 double m = ((d * (double)DAY_PARTS)/ (double) MONTH_PARTS); // Months (approx)
560 int32_t year = (int32_t)( ((19. * m + 234.) / 235.) + 1.); // Years (approx)
561 int32_t ys = startOfYear(year, status); // 1st day of year
562 int32_t dayOfYear = (d - ys);
563
564 // Because of the postponement rules, it's possible to guess wrong. Fix it.
565 while (dayOfYear < 1) {
566 year--;
567 ys = startOfYear(year, status);
568 dayOfYear = (d - ys);
569 }
570
571 // Now figure out which month we're in, and the date within that month
572 int32_t type = yearType(year);
573 UBool isLeap = isLeapYear(year);
574
575 int32_t month = 0;
576 int32_t momax = sizeof(MONTH_START) / (3 * sizeof(MONTH_START[0][0]));
577 while (month < momax && dayOfYear > ( isLeap ? LEAP_MONTH_START[month][type] : MONTH_START[month][type] ) ) {
578 month++;
579 }
580 if (month >= momax || month<=0) {
581 // TODO: I found dayOfYear could be out of range when
582 // a large value is set to julianDay. I patched startOfYear
583 // to reduce the chace, but it could be still reproduced either
584 // by startOfYear or other places. For now, we check
585 // the month is in valid range to avoid out of array index
586 // access problem here. However, we need to carefully review
587 // the calendar implementation to check the extreme limit of
588 // each calendar field and the code works well for any values
589 // in the valid value range. -yoshito
590 status = U_ILLEGAL_ARGUMENT_ERROR;
591 return;
592 }
593 month--;
594 int dayOfMonth = dayOfYear - (isLeap ? LEAP_MONTH_START[month][type] : MONTH_START[month][type]);
595
596 internalSet(UCAL_ERA, 0);
597 internalSet(UCAL_YEAR, year);
598 internalSet(UCAL_EXTENDED_YEAR, year);
599 internalSet(UCAL_MONTH, month);
600 internalSet(UCAL_DAY_OF_MONTH, dayOfMonth);
601 internalSet(UCAL_DAY_OF_YEAR, dayOfYear);
602 }
603
604 //-------------------------------------------------------------------------
605 // Functions for converting from field values to milliseconds
606 //-------------------------------------------------------------------------
607
608 /**
609 * @internal
610 */
611 int32_t HebrewCalendar::handleGetExtendedYear() {
612 int32_t year;
613 if (newerField(UCAL_EXTENDED_YEAR, UCAL_YEAR) == UCAL_EXTENDED_YEAR) {
614 year = internalGet(UCAL_EXTENDED_YEAR, 1); // Default to year 1
615 } else {
616 year = internalGet(UCAL_YEAR, 1); // Default to year 1
617 }
618 return year;
619 }
620
621 /**
622 * Return JD of start of given month/year.
623 * @internal
624 */
625 int32_t HebrewCalendar::handleComputeMonthStart(int32_t eyear, int32_t month, UBool /*useMonth*/) const {
626 UErrorCode status = U_ZERO_ERROR;
627 // Resolve out-of-range months. This is necessary in order to
628 // obtain the correct year. We correct to
629 // a 12- or 13-month year (add/subtract 12 or 13, depending
630 // on the year) but since we _always_ number from 0..12, and
631 // the leap year determines whether or not month 5 (Adar 1)
632 // is present, we allow 0..12 in any given year.
633 while (month < 0) {
634 month += monthsInYear(--eyear);
635 }
636 // Careful: allow 0..12 in all years
637 while (month > 12) {
638 month -= monthsInYear(eyear++);
639 }
640
641 int32_t day = startOfYear(eyear, status);
642
643 if(U_FAILURE(status)) {
644 return 0;
645 }
646
647 if (month != 0) {
648 if (isLeapYear(eyear)) {
649 day += LEAP_MONTH_START[month][yearType(eyear)];
650 } else {
651 day += MONTH_START[month][yearType(eyear)];
652 }
653 }
654
655 return (int) (day + 347997);
656 }
657
658 UBool
659 HebrewCalendar::inDaylightTime(UErrorCode& status) const
660 {
661 // copied from GregorianCalendar
662 if (U_FAILURE(status) || !getTimeZone().useDaylightTime())
663 return FALSE;
664
665 // Force an update of the state of the Calendar.
666 ((HebrewCalendar*)this)->complete(status); // cast away const
667
668 return (UBool)(U_SUCCESS(status) ? (internalGet(UCAL_DST_OFFSET) != 0) : FALSE);
669 }
670
671 /**
672 * The system maintains a static default century start date and Year. They are
673 * initialized the first time they are used. Once the system default century date
674 * and year are set, they do not change.
675 */
676 static UDate gSystemDefaultCenturyStart = DBL_MIN;
677 static int32_t gSystemDefaultCenturyStartYear = -1;
678 static icu::UInitOnce gSystemDefaultCenturyInit = U_INITONCE_INITIALIZER;
679
680 UBool HebrewCalendar::haveDefaultCentury() const
681 {
682 return TRUE;
683 }
684
685 static void U_CALLCONV initializeSystemDefaultCentury()
686 {
687 // initialize systemDefaultCentury and systemDefaultCenturyYear based
688 // on the current time. They'll be set to 80 years before
689 // the current time.
690 UErrorCode status = U_ZERO_ERROR;
691 HebrewCalendar calendar(Locale("@calendar=hebrew"),status);
692 if (U_SUCCESS(status)) {
693 calendar.setTime(Calendar::getNow(), status);
694 calendar.add(UCAL_YEAR, -80, status);
695
696 gSystemDefaultCenturyStart = calendar.getTime(status);
697 gSystemDefaultCenturyStartYear = calendar.get(UCAL_YEAR, status);
698 }
699 // We have no recourse upon failure unless we want to propagate the failure
700 // out.
701 }
702
703
704 UDate HebrewCalendar::defaultCenturyStart() const {
705 // lazy-evaluate systemDefaultCenturyStart
706 umtx_initOnce(gSystemDefaultCenturyInit, &initializeSystemDefaultCentury);
707 return gSystemDefaultCenturyStart;
708 }
709
710 int32_t HebrewCalendar::defaultCenturyStartYear() const {
711 // lazy-evaluate systemDefaultCenturyStartYear
712 umtx_initOnce(gSystemDefaultCenturyInit, &initializeSystemDefaultCentury);
713 return gSystemDefaultCenturyStartYear;
714 }
715
716
717 UOBJECT_DEFINE_RTTI_IMPLEMENTATION(HebrewCalendar)
718
719 U_NAMESPACE_END
720
721 #endif // UCONFIG_NO_FORMATTING
722

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