1/* 2****************************************************************************** 3* Copyright (C) 2003-2013, International Business Machines Corporation 4* and others. All Rights Reserved. 5****************************************************************************** 6* 7* File ISLAMCAL.H 8* 9* Modification History: 10* 11* Date Name Description 12* 10/14/2003 srl ported from java IslamicCalendar 13***************************************************************************** 14*/ 15 16#include "islamcal.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#include "uassert.h" 27 28static const UDate HIJRA_MILLIS = -42521587200000.0; // 7/16/622 AD 00:00 29 30// Debugging 31#ifdef U_DEBUG_ISLAMCAL 32# include <stdio.h> 33# include <stdarg.h> 34static void debug_islamcal_loc(const char *f, int32_t l) 35{ 36 fprintf(stderr, "%s:%d: ", f, l); 37} 38 39static void debug_islamcal_msg(const char *pat, ...) 40{ 41 va_list ap; 42 va_start(ap, pat); 43 vfprintf(stderr, pat, ap); 44 fflush(stderr); 45} 46// must use double parens, i.e.: U_DEBUG_ISLAMCAL_MSG(("four is: %d",4)); 47#define U_DEBUG_ISLAMCAL_MSG(x) {debug_islamcal_loc(__FILE__,__LINE__);debug_islamcal_msg x;} 48#else 49#define U_DEBUG_ISLAMCAL_MSG(x) 50#endif 51 52 53// --- The cache -- 54// cache of months 55static UMutex astroLock = U_MUTEX_INITIALIZER; // pod bay door lock 56static icu::CalendarCache *gMonthCache = NULL; 57static icu::CalendarAstronomer *gIslamicCalendarAstro = NULL; 58 59U_CDECL_BEGIN 60static UBool calendar_islamic_cleanup(void) { 61 if (gMonthCache) { 62 delete gMonthCache; 63 gMonthCache = NULL; 64 } 65 if (gIslamicCalendarAstro) { 66 delete gIslamicCalendarAstro; 67 gIslamicCalendarAstro = NULL; 68 } 69 return TRUE; 70} 71U_CDECL_END 72 73U_NAMESPACE_BEGIN 74 75// Implementation of the IslamicCalendar class 76 77/** 78 * Friday EPOC 79 */ 80static const int32_t CIVIL_EPOC = 1948440; // CE 622 July 16 Friday (Julian calendar) / CE 622 July 19 (Gregorian calendar) 81 82/** 83 * Thursday EPOC 84 */ 85static const int32_t ASTRONOMICAL_EPOC = 1948439; // CE 622 July 15 Thursday (Julian calendar) 86 87 88static const int32_t UMALQURA_YEAR_START = 1318; 89static const int32_t UMALQURA_YEAR_END = 1480; 90 91static const int UMALQURA_MONTHLENGTH[] = { 92 //* 1318 -1322 */ "1011 0110 1010", "1001 0111 0101", "0100 1010 1110", "1010 0100 1111", "0101 0010 1011", 93 0x0B6A, 0x0975, 0x04AE, 0x0A4F, 0x052B, 94 //* 1323 -1327 */ "0110 1001 0101", "0110 1100 1010", "1010 1101 0101", "0010 1101 0110", "1001 0101 1011", 95 0x0695, 0x06CA, 0x0AD5, 0x02D6, 0x095B, 96 //* 1328 -1332 */ "1001 0010 1101", "1100 1001 0101", "1101 0100 1010", "1101 1001 0101", "0110 1101 0010", 97 0x092D, 0x0C95, 0x0D4A, 0x0D95, 0x025B, 98 //* 1333 -1337 */ "1010 1101 0101", "0101 0101 1010", "1010 1010 1011", "0101 0010 1011", "0110 1010 0101", 99 0x0AD5, 0x055A, 0x0AAB, 0x052B, 0x06A5, 100 //* 1338 -1342 */ "0111 0101 0010", "1011 1010 1001", "0011 0111 0100", "1010 1011 0110", "0101 0101 0110", 101 0x0752, 0x0BA9, 0x0374, 0x0AB6, 0x0556, 102 //* 1343 -1347 */ "1010 1010 1010", "1101 0101 0010", "1011 1010 0100", "1011 1101 0010", "1010 1110 1010", 103 0x0AAA, 0x0D52, 0x0BA4, 0x0BD2, 0x0AEA, 104 //* 1348 -1352 */ "0010 1101 1100", "1001 0110 1101", "1001 0010 1110", "1010 1010 0110", "1101 0101 0100", 105 0x02DC, 0x096D, 0x092E, 0x0AA6, 0x0D54, 106 //* 1353 -1357 */ "1011 1010 0101", "0101 1011 0100", "1001 1011 0110", "1001 0011 0111", "0100 1001 1011", 107 0x0BA5, 0x05B4, 0x09B6, 0x0937, 0x049B, 108 //* 1358 -1362 */ "1010 0100 1011", "1011 0010 0101", "1011 0101 0100", "1011 0110 1010", "0101 0110 1010", 109 0x0A4B, 0x0B25, 0x0B54, 0x0B6A, 0x056A, 110 //* 1363 -1367 */ "1010 1010 1011", "1010 0101 0101", "1101 0010 0101", "1110 1001 0010", "1110 1100 1001", 111 0x0AAB, 0x0A55, 0x0D25, 0x0E92, 0x0EC9, 112 //* 1368 -1372 */ "0110 1101 0100", "1010 1110 1010", "0101 0110 1011", "0100 1010 1011", "1001 0100 1011", 113 0x06D4, 0x0ADA, 0x056B, 0x04AB, 0x094B, 114 //* 1373 -1377 */ "1011 0100 1001", "1011 1010 0100", "1011 1011 0010", "0101 1011 0101", "0010 1011 1010", 115 0x0B49, 0x0BA4, 0x0BB2, 0x05B5, 0x02BA, 116 //* 1378 -1382 */ "1001 0101 1011", "0100 1010 1011", "0101 0101 0101", "0110 1011 0010", "0101 1011 0100", 117 0x095B, 0x04AB, 0x0555, 0x06B2, 0x05B4, 118 //* 1383 -1387 */ "1001 1101 1010", "1001 0110 1110", "0100 1010 1110", "1010 0101 0110", "1101 0010 1010", 119 0x09DA, 0x096E, 0x04AE, 0x0A56, 0x0D2A, 120 //* 1388 -1392 */ "1101 0101 0100", "1101 1011 0010", "1010 1011 0101", "0010 1101 1010", "1001 0101 1011", 121 0x0D54, 0x0DB2, 0x0AB5, 0x02DA, 0x095B, 122 //* 1393 -1397 */ "1001 0010 1011", "1010 1001 0101", "1011 0100 1001", "1011 0110 0100", "1011 0111 0001", 123 0x092B, 0x0A95, 0x0B49, 0x0B64, 0x0B71, 124 //* 1398 -1402 */ "0101 1011 0100", "1010 1011 0101", "1010 1001 0110", "1101 0100 1010", "1110 1001 0010", 125 0x05B4, 0x0AB5, 0x0A96, 0x0B4A, 0x0E92, 126 //* 1403 -1407 */ "1110 1100 1001", "0110 1101 0100", "1010 1110 1001", "1010 1010 1101", "0101 0101 0101", 127 0x0EC9, 0x06D4, 0x0AE9, 0x0AAD, 0x0555, 128 //* 1408 -1412 */ "1010 1010 0101", "1011 0101 0010", "1101 1010 0100", "1101 1011 0010", "1001 1011 1010", 129 0x0AA5, 0x0B52, 0x0DA4, 0x0DB2, 0x09BA, 130 //* 1413 -1417 */ "0100 1011 1010", "1010 0101 1011", "0101 0010 1101", "1010 1010 0101", "1010 1101 0100", 131 0x04BA, 0x0A5B, 0x052D, 0x0AA5, 0x0AD4, 132 //* 1418 -1422 */ "1010 1110 1010", "0101 0101 1100", "0100 1011 1101", "0010 0011 1101", "1001 0001 1101", 133 0x0AEA, 0x055C, 0x04BD, 0x023D, 0x091D, 134 //* 1423 -1427 */ "1010 1001 0101", "1011 0100 1010", "1011 0101 1010", "0101 0110 1101", "0010 1011 0110", 135 0x0A95, 0x0B4A, 0x0B5A, 0x056D, 0x02B6, 136 //* 1428 -1432 */ "1001 0011 1011", "0100 1001 1011", "0110 0101 0101", "0110 1010 1001", "0111 0101 0100", 137 0x093B, 0x049B, 0x0655, 0x06A9, 0x0754, 138 //* 1433 -1437 */ "1011 0110 1010", "0101 0110 1100", "1010 1010 1101", "0101 0101 0101", "1011 0010 1001", 139 0x0B6A, 0x056C, 0x0AAD, 0x0555, 0x0B29, 140 //* 1438 -1442 */ "1011 1001 0010", "1011 1010 1001", "0101 1101 0100", "1010 1101 1010", "0101 0101 1010", 141 0x0B92, 0x0BA9, 0x05D4, 0x0ADA, 0x055A, 142 //* 1443 -1447 */ "1010 1010 1011", "0101 1001 0101", "0111 0100 1001", "0111 0110 0100", "1011 1010 1010", 143 0x0AAB, 0x0595, 0x0749, 0x0764, 0x0BAA, 144 //* 1448 -1452 */ "0101 1011 0101", "0010 1011 0110", "1010 0101 0110", "1110 0100 1101", "1011 0010 0101", 145 0x05B5, 0x02B6, 0x0A56, 0x0E4D, 0x0B25, 146 //* 1453 -1457 */ "1011 0101 0010", "1011 0110 1010", "0101 1010 1101", "0010 1010 1110", "1001 0010 1111", 147 0x0B52, 0x0B6A, 0x05AD, 0x02AE, 0x092F, 148 //* 1458 -1462 */ "0100 1001 0111", "0110 0100 1011", "0110 1010 0101", "0110 1010 1100", "1010 1101 0110", 149 0x0497, 0x064B, 0x06A5, 0x06AC, 0x0AD6, 150 //* 1463 -1467 */ "0101 0101 1101", "0100 1001 1101", "1010 0100 1101", "1101 0001 0110", "1101 1001 0101", 151 0x055D, 0x049D, 0x0A4D, 0x0D16, 0x0D95, 152 //* 1468 -1472 */ "0101 1010 1010", "0101 1011 0101", "0010 1101 1010", "1001 0101 1011", "0100 1010 1101", 153 0x05AA, 0x05B5, 0x02DA, 0x095B, 0x04AD, 154 //* 1473 -1477 */ "0101 1001 0101", "0110 1100 1010", "0110 1110 0100", "1010 1110 1010", "0100 1111 0101", 155 0x0595, 0x06CA, 0x06E4, 0x0AEA, 0x04F5, 156 //* 1478 -1480 */ "0010 1011 0110", "1001 0101 0110", "1010 1010 1010" 157 0x02B6, 0x0956, 0x0AAA 158}; 159 160int32_t getUmalqura_MonthLength(int32_t y, int32_t m) { 161 int32_t mask = (int32_t) (0x01 << (11 - m)); // set mask for bit corresponding to month 162 if((UMALQURA_MONTHLENGTH[y] & mask) == 0 ) 163 return 29; 164 else 165 return 30; 166 167} 168 169//------------------------------------------------------------------------- 170// Constructors... 171//------------------------------------------------------------------------- 172 173const char *IslamicCalendar::getType() const { 174 const char *sType = NULL; 175 176 switch (cType) { 177 case CIVIL: 178 sType = "islamic-civil"; 179 break; 180 case ASTRONOMICAL: 181 sType = "islamic"; 182 break; 183 case TBLA: 184 sType = "islamic-tbla"; 185 break; 186 case UMALQURA: 187 sType = "islamic-umalqura"; 188 break; 189 default: 190 U_ASSERT(false); // out of range 191 sType = "islamic"; // "islamic" is used as the generic type 192 break; 193 } 194 return sType; 195} 196 197Calendar* IslamicCalendar::clone() const { 198 return new IslamicCalendar(*this); 199} 200 201IslamicCalendar::IslamicCalendar(const Locale& aLocale, UErrorCode& success, ECalculationType type) 202: Calendar(TimeZone::createDefault(), aLocale, success), 203cType(type) 204{ 205 setTimeInMillis(getNow(), success); // Call this again now that the vtable is set up properly. 206} 207 208IslamicCalendar::IslamicCalendar(const IslamicCalendar& other) : Calendar(other), cType(other.cType) { 209} 210 211IslamicCalendar::~IslamicCalendar() 212{ 213} 214 215void IslamicCalendar::setCalculationType(ECalculationType type, UErrorCode &status) 216{ 217 if (cType != type) { 218 // The fields of the calendar will become invalid, because the calendar 219 // rules are different 220 UDate m = getTimeInMillis(status); 221 cType = type; 222 clear(); 223 setTimeInMillis(m, status); 224 } 225} 226 227/** 228* Returns <code>true</code> if this object is using the fixed-cycle civil 229* calendar, or <code>false</code> if using the religious, astronomical 230* calendar. 231* @draft ICU 2.4 232*/ 233UBool IslamicCalendar::isCivil() { 234 return (cType == CIVIL); 235} 236 237//------------------------------------------------------------------------- 238// Minimum / Maximum access functions 239//------------------------------------------------------------------------- 240 241// Note: Current IslamicCalendar implementation does not work 242// well with negative years. 243 244// TODO: In some cases the current ICU Islamic calendar implementation shows 245// a month as having 31 days. Since date parsing now uses range checks based 246// on the table below, we need to change the range for last day of month to 247// include 31 as a workaround until the implementation is fixed. 248static const int32_t LIMITS[UCAL_FIELD_COUNT][4] = { 249 // Minimum Greatest Least Maximum 250 // Minimum Maximum 251 { 0, 0, 0, 0}, // ERA 252 { 1, 1, 5000000, 5000000}, // YEAR 253 { 0, 0, 11, 11}, // MONTH 254 { 1, 1, 50, 51}, // WEEK_OF_YEAR 255 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // WEEK_OF_MONTH 256 { 1, 1, 29, 31}, // DAY_OF_MONTH - 31 to workaround for cal implementation bug, should be 30 257 { 1, 1, 354, 355}, // DAY_OF_YEAR 258 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // DAY_OF_WEEK 259 { -1, -1, 5, 5}, // DAY_OF_WEEK_IN_MONTH 260 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // AM_PM 261 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // HOUR 262 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // HOUR_OF_DAY 263 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // MINUTE 264 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // SECOND 265 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // MILLISECOND 266 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // ZONE_OFFSET 267 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // DST_OFFSET 268 { 1, 1, 5000000, 5000000}, // YEAR_WOY 269 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // DOW_LOCAL 270 { 1, 1, 5000000, 5000000}, // EXTENDED_YEAR 271 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // JULIAN_DAY 272 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // MILLISECONDS_IN_DAY 273 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // IS_LEAP_MONTH 274}; 275 276/** 277* @draft ICU 2.4 278*/ 279int32_t IslamicCalendar::handleGetLimit(UCalendarDateFields field, ELimitType limitType) const { 280 return LIMITS[field][limitType]; 281} 282 283//------------------------------------------------------------------------- 284// Assorted calculation utilities 285// 286 287// table mapping extended year to julian day 288// for year start in the Umm-Al-Qura calendar. 289// 660 bytes 290static const int32_t jdForUmAlQuraYrStart[] = { 291// jdIsUm isYr 292 466700, // 1318 293 467055, // 1319 294 467410, // 1320 295 467764, // 1321 296 468119, // 1322 297 468473, // 1323 298 468827, // 1324 299 469181, // 1325 300 469536, // 1326 301 469890, // 1327 302 470245, // 1328 303 470599, // 1329 304 470953, // 1330 305 471307, // 1331 306 471662, // 1332 307 472016, // 1333 308 472371, // 1334 309 472725, // 1335 310 473080, // 1336 311 473434, // 1337 312 473788, // 1338 313 474142, // 1339 314 474497, // 1340 315 474851, // 1341 316 475206, // 1342 317 475560, // 1343 318 475914, // 1344 319 476268, // 1345 320 476622, // 1346 321 476977, // 1347 322 477332, // 1348 323 477686, // 1349 324 478041, // 1350 325 478395, // 1351 326 478749, // 1352 327 479103, // 1353 328 479458, // 1354 329 479812, // 1355 330 480167, // 1356 331 480522, // 1357 332 480876, // 1358 333 481230, // 1359 334 481584, // 1360 335 481938, // 1361 336 482293, // 1362 337 482647, // 1363 338 483002, // 1364 339 483356, // 1365 340 483710, // 1366 341 484064, // 1367 342 484419, // 1368 343 484773, // 1369 344 485128, // 1370 345 485483, // 1371 346 485837, // 1372 347 486191, // 1373 348 486545, // 1374 349 486899, // 1375 350 487254, // 1376 351 487609, // 1377 352 487963, // 1378 353 488318, // 1379 354 488672, // 1380 355 489026, // 1381 356 489380, // 1382 357 489734, // 1383 358 490089, // 1384 359 490444, // 1385 360 490798, // 1386 361 491152, // 1387 362 491506, // 1388 363 491860, // 1389 364 492215, // 1390 365 492570, // 1391 366 492924, // 1392 367 493279, // 1393 368 493633, // 1394 369 493987, // 1395 370 494341, // 1396 371 494695, // 1397 372 495050, // 1398 373 495404, // 1399 374 495759, // 1400 375 496113, // 1401 376 496467, // 1402 377 496821, // 1403 378 497176, // 1404 379 497530, // 1405 380 497885, // 1406 381 498240, // 1407 382 498594, // 1408 383 498948, // 1409 384 499302, // 1410 385 499656, // 1411 386 500011, // 1412 387 500366, // 1413 388 500720, // 1414 389 501075, // 1415 390 501429, // 1416 391 501783, // 1417 392 502137, // 1418 393 502492, // 1419 394 502846, // 1420 395 503201, // 1421 396 503555, // 1422 397 503909, // 1423 398 504263, // 1424 399 504617, // 1425 400 504972, // 1426 401 505327, // 1427 402 505681, // 1428 403 506036, // 1429 404 506390, // 1430 405 506744, // 1431 406 507098, // 1432 407 507452, // 1433 408 507807, // 1434 409 508161, // 1435 410 508516, // 1436 411 508870, // 1437 412 509224, // 1438 413 509578, // 1439 414 509933, // 1440 415 510287, // 1441 416 510642, // 1442 417 510996, // 1443 418 511351, // 1444 419 511705, // 1445 420 512059, // 1446 421 512413, // 1447 422 512768, // 1448 423 513123, // 1449 424 513477, // 1450 425 513831, // 1451 426 514186, // 1452 427 514540, // 1453 428 514894, // 1454 429 515249, // 1455 430 515604, // 1456 431 515958, // 1457 432 516313, // 1458 433 516667, // 1459 434 517021, // 1460 435 517375, // 1461 436 517729, // 1462 437 518084, // 1463 438 518439, // 1464 439 518793, // 1465 440 519147, // 1466 441 519501, // 1467 442 519856, // 1468 443 520210, // 1469 444 520565, // 1470 445 520919, // 1471 446 521274, // 1472 447 521628, // 1473 448 521982, // 1474 449 522336, // 1475 450 522690, // 1476 451 523045, // 1477 452 523400, // 1478 453 523754, // 1479 454 524108, // 1480 455}; 456 457/** 458* Determine whether a year is a leap year in the Islamic civil calendar 459*/ 460UBool IslamicCalendar::civilLeapYear(int32_t year) 461{ 462 return (14 + 11 * year) % 30 < 11; 463} 464 465/** 466* Return the day # on which the given year starts. Days are counted 467* from the Hijri epoch, origin 0. 468*/ 469int32_t IslamicCalendar::yearStart(int32_t year) const{ 470 if (cType == CIVIL || cType == TBLA || 471 (cType == UMALQURA && (year < UMALQURA_YEAR_START || year > UMALQURA_YEAR_END))) 472 { 473 // The following is similar to part of 474 // Dershowitz & Reingold, 3rd ed., formula 6.3 475 // adjusted to give day offset within current epoch. 476 return (year-1)*354 + ClockMath::floorDivide((3+11*year),30); 477 } else if(cType==ASTRONOMICAL){ 478 return trueMonthStart(12*(year-1)); 479 } else { 480 return jdForUmAlQuraYrStart[year - UMALQURA_YEAR_START]; 481 } 482} 483 484/** 485* Return the day # on which the given month starts. Days are counted 486* from the Hijri epoch, origin 0. 487* 488* @param year The hijri year 489* @param year The hijri month, 0-based (assumed to be in range 0..11) 490*/ 491int32_t IslamicCalendar::monthStart(int32_t year, int32_t month) const { 492 if (cType == CIVIL || cType == TBLA) { 493 // The following is similar to part of 494 // Dershowitz & Reingold, 3rd ed., formula 6.3 495 // adjusted for 0-based months and to give day offset within current epoch. 496 // This does not handle months out of the range 0..11 497 return (year-1)*354 + (int32_t)ClockMath::floorDivide((3+11*year),30) + 498 (int32_t)uprv_ceil(29.5*month); 499 } else if(cType==ASTRONOMICAL){ 500 return trueMonthStart(12*(year-1) + month); 501 } else { 502 int32_t ms = yearStart(year); 503 for(int i=0; i< month; i++){ 504 ms+= handleGetMonthLength(year, i); 505 } 506 return ms; 507 } 508} 509 510/** 511* Find the day number on which a particular month of the true/lunar 512* Islamic calendar starts. 513* 514* @param month The month in question, origin 0 from the Hijri epoch 515* 516* @return The day number on which the given month starts. 517*/ 518int32_t IslamicCalendar::trueMonthStart(int32_t month) const 519{ 520 UErrorCode status = U_ZERO_ERROR; 521 int32_t start = CalendarCache::get(&gMonthCache, month, status); 522 523 if (start==0) { 524 // Make a guess at when the month started, using the average length 525 UDate origin = HIJRA_MILLIS 526 + uprv_floor(month * CalendarAstronomer::SYNODIC_MONTH) * kOneDay; 527 528 // moonAge will fail due to memory allocation error 529 double age = moonAge(origin, status); 530 if (U_FAILURE(status)) { 531 goto trueMonthStartEnd; 532 } 533 534 if (age >= 0) { 535 // The month has already started 536 do { 537 origin -= kOneDay; 538 age = moonAge(origin, status); 539 if (U_FAILURE(status)) { 540 goto trueMonthStartEnd; 541 } 542 } while (age >= 0); 543 } 544 else { 545 // Preceding month has not ended yet. 546 do { 547 origin += kOneDay; 548 age = moonAge(origin, status); 549 if (U_FAILURE(status)) { 550 goto trueMonthStartEnd; 551 } 552 } while (age < 0); 553 } 554 start = (int32_t)ClockMath::floorDivide((origin - HIJRA_MILLIS), (double)kOneDay) + 1; 555 CalendarCache::put(&gMonthCache, month, start, status); 556 } 557trueMonthStartEnd : 558 if(U_FAILURE(status)) { 559 start = 0; 560 } 561 return start; 562} 563 564/** 565* Return the "age" of the moon at the given time; this is the difference 566* in ecliptic latitude between the moon and the sun. This method simply 567* calls CalendarAstronomer.moonAge, converts to degrees, 568* and adjusts the result to be in the range [-180, 180]. 569* 570* @param time The time at which the moon's age is desired, 571* in millis since 1/1/1970. 572*/ 573double IslamicCalendar::moonAge(UDate time, UErrorCode &status) 574{ 575 double age = 0; 576 577 umtx_lock(&astroLock); 578 if(gIslamicCalendarAstro == NULL) { 579 gIslamicCalendarAstro = new CalendarAstronomer(); 580 if (gIslamicCalendarAstro == NULL) { 581 status = U_MEMORY_ALLOCATION_ERROR; 582 return age; 583 } 584 ucln_i18n_registerCleanup(UCLN_I18N_ISLAMIC_CALENDAR, calendar_islamic_cleanup); 585 } 586 gIslamicCalendarAstro->setTime(time); 587 age = gIslamicCalendarAstro->getMoonAge(); 588 umtx_unlock(&astroLock); 589 590 // Convert to degrees and normalize... 591 age = age * 180 / CalendarAstronomer::PI; 592 if (age > 180) { 593 age = age - 360; 594 } 595 596 return age; 597} 598 599//---------------------------------------------------------------------- 600// Calendar framework 601//---------------------------------------------------------------------- 602 603/** 604* Return the length (in days) of the given month. 605* 606* @param year The hijri year 607* @param year The hijri month, 0-based 608* @draft ICU 2.4 609*/ 610int32_t IslamicCalendar::handleGetMonthLength(int32_t extendedYear, int32_t month) const { 611 612 int32_t length = 0; 613 614 if (cType == CIVIL || cType == TBLA || 615 (cType == UMALQURA && (extendedYear<UMALQURA_YEAR_START || extendedYear>UMALQURA_YEAR_END)) ) { 616 length = 29 + (month+1) % 2; 617 if (month == DHU_AL_HIJJAH && civilLeapYear(extendedYear)) { 618 length++; 619 } 620 } else if(cType == ASTRONOMICAL){ 621 month = 12*(extendedYear-1) + month; 622 length = trueMonthStart(month+1) - trueMonthStart(month) ; 623 } else { 624 length = getUmalqura_MonthLength(extendedYear - UMALQURA_YEAR_START, month); 625 } 626 return length; 627} 628 629/** 630* Return the number of days in the given Islamic year 631* @draft ICU 2.4 632*/ 633int32_t IslamicCalendar::handleGetYearLength(int32_t extendedYear) const { 634 if (cType == CIVIL || cType == TBLA || 635 (cType == UMALQURA && (extendedYear<UMALQURA_YEAR_START || extendedYear>UMALQURA_YEAR_END)) ) { 636 return 354 + (civilLeapYear(extendedYear) ? 1 : 0); 637 } else if(cType == ASTRONOMICAL){ 638 int32_t month = 12*(extendedYear-1); 639 return (trueMonthStart(month + 12) - trueMonthStart(month)); 640 } else { 641 int len = 0; 642 for(int i=0; i<12; i++) { 643 len += handleGetMonthLength(extendedYear, i); 644 } 645 return len; 646 } 647} 648 649//------------------------------------------------------------------------- 650// Functions for converting from field values to milliseconds.... 651//------------------------------------------------------------------------- 652 653// Return JD of start of given month/year 654// Calendar says: 655// Get the Julian day of the day BEFORE the start of this year. 656// If useMonth is true, get the day before the start of the month. 657// Hence the -1 658/** 659* @draft ICU 2.4 660*/ 661int32_t IslamicCalendar::handleComputeMonthStart(int32_t eyear, int32_t month, UBool /* useMonth */) const { 662 // This may be called by Calendar::handleComputeJulianDay with months out of the range 663 // 0..11. Need to handle that here since monthStart requires months in the range 0.11. 664 if (month > 11) { 665 eyear += (month / 12); 666 month %= 12; 667 } else if (month < 0) { 668 month++; 669 eyear += (month / 12) - 1; 670 month = (month % 12) + 11; 671 } 672 return monthStart(eyear, month) + ((cType == TBLA)? ASTRONOMICAL_EPOC: CIVIL_EPOC) - 1; 673} 674 675//------------------------------------------------------------------------- 676// Functions for converting from milliseconds to field values 677//------------------------------------------------------------------------- 678 679/** 680* @draft ICU 2.4 681*/ 682int32_t IslamicCalendar::handleGetExtendedYear() { 683 int32_t year; 684 if (newerField(UCAL_EXTENDED_YEAR, UCAL_YEAR) == UCAL_EXTENDED_YEAR) { 685 year = internalGet(UCAL_EXTENDED_YEAR, 1); // Default to year 1 686 } else { 687 year = internalGet(UCAL_YEAR, 1); // Default to year 1 688 } 689 return year; 690} 691 692/** 693* Override Calendar to compute several fields specific to the Islamic 694* calendar system. These are: 695* 696* <ul><li>ERA 697* <li>YEAR 698* <li>MONTH 699* <li>DAY_OF_MONTH 700* <li>DAY_OF_YEAR 701* <li>EXTENDED_YEAR</ul> 702* 703* The DAY_OF_WEEK and DOW_LOCAL fields are already set when this 704* method is called. The getGregorianXxx() methods return Gregorian 705* calendar equivalents for the given Julian day. 706* @draft ICU 2.4 707*/ 708void IslamicCalendar::handleComputeFields(int32_t julianDay, UErrorCode &status) { 709 int32_t year, month, dayOfMonth, dayOfYear; 710 int32_t startDate; 711 int32_t days = julianDay - CIVIL_EPOC; 712 713 if (cType == CIVIL || cType == TBLA) { 714 if(cType == TBLA) { 715 days = julianDay - ASTRONOMICAL_EPOC; 716 } 717 // Use the civil calendar approximation, which is just arithmetic. 718 // The following is similar to part of 719 // Dershowitz & Reingold, 3rd ed., formula 6.4 720 year = (int)ClockMath::floorDivide( (double)(30 * days + 10646) , 10631.0 ); 721 month = (int32_t)uprv_ceil((days - 29 - yearStart(year)) / 29.5 ); 722 month = month<11?month:11; 723 startDate = monthStart(year, month); 724 } else if(cType == ASTRONOMICAL){ 725 // Guess at the number of elapsed full months since the epoch 726 int32_t months = (int32_t)uprv_floor((double)days / CalendarAstronomer::SYNODIC_MONTH); 727 728 startDate = (int32_t)uprv_floor(months * CalendarAstronomer::SYNODIC_MONTH); 729 730 double age = moonAge(internalGetTime(), status); 731 if (U_FAILURE(status)) { 732 status = U_MEMORY_ALLOCATION_ERROR; 733 return; 734 } 735 if ( days - startDate >= 25 && age > 0) { 736 // If we're near the end of the month, assume next month and search backwards 737 months++; 738 } 739 740 // Find out the last time that the new moon was actually visible at this longitude 741 // This returns midnight the night that the moon was visible at sunset. 742 while ((startDate = trueMonthStart(months)) > days) { 743 // If it was after the date in question, back up a month and try again 744 months--; 745 } 746 747 year = months / 12 + 1; 748 month = months % 12; 749 } else if(cType == UMALQURA) { 750 int32_t umalquraStartdays = yearStart(UMALQURA_YEAR_START) ; 751 if( days < umalquraStartdays){ 752 //Use Civil calculation 753 year = (int)ClockMath::floorDivide( (double)(30 * days + 10646) , 10631.0 ); 754 month = (int32_t)uprv_ceil((days - 29 - yearStart(year)) / 29.5 ); 755 month = month<11?month:11; 756 startDate = monthStart(year, month); 757 }else{ 758 int y =UMALQURA_YEAR_START-1, m =0; 759 long d = 1; 760 while(d > 0){ 761 y++; 762 d = days - yearStart(y) +1; 763 if(d == handleGetYearLength(y)){ 764 m=11; 765 break; 766 }else if(d < handleGetYearLength(y) ){ 767 int monthLen = handleGetMonthLength(y, m); 768 m=0; 769 while(d > monthLen){ 770 d -= monthLen; 771 m++; 772 monthLen = handleGetMonthLength(y, m); 773 } 774 break; 775 } 776 } 777 year = y; 778 month = m; 779 } 780 } else { // invalid 'civil' 781 U_ASSERT(false); // should not get here, out of range 782 year=month=0; 783 } 784 785 dayOfMonth = (days - monthStart(year, month)) + 1; 786 787 // Now figure out the day of the year. 788 dayOfYear = (days - monthStart(year, 0)) + 1; 789 790 791 internalSet(UCAL_ERA, 0); 792 internalSet(UCAL_YEAR, year); 793 internalSet(UCAL_EXTENDED_YEAR, year); 794 internalSet(UCAL_MONTH, month); 795 internalSet(UCAL_DAY_OF_MONTH, dayOfMonth); 796 internalSet(UCAL_DAY_OF_YEAR, dayOfYear); 797} 798 799UBool 800IslamicCalendar::inDaylightTime(UErrorCode& status) const 801{ 802 // copied from GregorianCalendar 803 if (U_FAILURE(status) || (&(getTimeZone()) == NULL && !getTimeZone().useDaylightTime())) 804 return FALSE; 805 806 // Force an update of the state of the Calendar. 807 ((IslamicCalendar*)this)->complete(status); // cast away const 808 809 return (UBool)(U_SUCCESS(status) ? (internalGet(UCAL_DST_OFFSET) != 0) : FALSE); 810} 811 812/** 813 * The system maintains a static default century start date and Year. They are 814 * initialized the first time they are used. Once the system default century date 815 * and year are set, they do not change. 816 */ 817static UDate gSystemDefaultCenturyStart = DBL_MIN; 818static int32_t gSystemDefaultCenturyStartYear = -1; 819static icu::UInitOnce gSystemDefaultCenturyInit = U_INITONCE_INITIALIZER; 820 821 822UBool IslamicCalendar::haveDefaultCentury() const 823{ 824 return TRUE; 825} 826 827UDate IslamicCalendar::defaultCenturyStart() const 828{ 829 // lazy-evaluate systemDefaultCenturyStart 830 umtx_initOnce(gSystemDefaultCenturyInit, &initializeSystemDefaultCentury); 831 return gSystemDefaultCenturyStart; 832} 833 834int32_t IslamicCalendar::defaultCenturyStartYear() const 835{ 836 // lazy-evaluate systemDefaultCenturyStartYear 837 umtx_initOnce(gSystemDefaultCenturyInit, &initializeSystemDefaultCentury); 838 return gSystemDefaultCenturyStartYear; 839} 840 841 842void U_CALLCONV 843IslamicCalendar::initializeSystemDefaultCentury() 844{ 845 // initialize systemDefaultCentury and systemDefaultCenturyYear based 846 // on the current time. They'll be set to 80 years before 847 // the current time. 848 UErrorCode status = U_ZERO_ERROR; 849 IslamicCalendar calendar(Locale("@calendar=islamic-civil"),status); 850 if (U_SUCCESS(status)) { 851 calendar.setTime(Calendar::getNow(), status); 852 calendar.add(UCAL_YEAR, -80, status); 853 854 gSystemDefaultCenturyStart = calendar.getTime(status); 855 gSystemDefaultCenturyStartYear = calendar.get(UCAL_YEAR, status); 856 } 857 // We have no recourse upon failure unless we want to propagate the failure 858 // out. 859} 860 861 862 863UOBJECT_DEFINE_RTTI_IMPLEMENTATION(IslamicCalendar) 864 865U_NAMESPACE_END 866 867#endif 868 869