| /* |
| ****************************************************************************** |
| * Copyright (C) 2003-2013, International Business Machines Corporation |
| * and others. All Rights Reserved. |
| ****************************************************************************** |
| * |
| * File ISLAMCAL.H |
| * |
| * Modification History: |
| * |
| * Date Name Description |
| * 10/14/2003 srl ported from java IslamicCalendar |
| ***************************************************************************** |
| */ |
| |
| #include "islamcal.h" |
| |
| #if !UCONFIG_NO_FORMATTING |
| |
| #include "umutex.h" |
| #include <float.h> |
| #include "gregoimp.h" // Math |
| #include "astro.h" // CalendarAstronomer |
| #include "uhash.h" |
| #include "ucln_in.h" |
| #include "uassert.h" |
| |
| static const UDate HIJRA_MILLIS = -42521587200000.0; // 7/16/622 AD 00:00 |
| |
| // Debugging |
| #ifdef U_DEBUG_ISLAMCAL |
| # include <stdio.h> |
| # include <stdarg.h> |
| static void debug_islamcal_loc(const char *f, int32_t l) |
| { |
| fprintf(stderr, "%s:%d: ", f, l); |
| } |
| |
| static void debug_islamcal_msg(const char *pat, ...) |
| { |
| va_list ap; |
| va_start(ap, pat); |
| vfprintf(stderr, pat, ap); |
| fflush(stderr); |
| } |
| // must use double parens, i.e.: U_DEBUG_ISLAMCAL_MSG(("four is: %d",4)); |
| #define U_DEBUG_ISLAMCAL_MSG(x) {debug_islamcal_loc(__FILE__,__LINE__);debug_islamcal_msg x;} |
| #else |
| #define U_DEBUG_ISLAMCAL_MSG(x) |
| #endif |
| |
| |
| // --- The cache -- |
| // cache of months |
| static UMutex astroLock = U_MUTEX_INITIALIZER; // pod bay door lock |
| static icu::CalendarCache *gMonthCache = NULL; |
| static icu::CalendarAstronomer *gIslamicCalendarAstro = NULL; |
| |
| U_CDECL_BEGIN |
| static UBool calendar_islamic_cleanup(void) { |
| if (gMonthCache) { |
| delete gMonthCache; |
| gMonthCache = NULL; |
| } |
| if (gIslamicCalendarAstro) { |
| delete gIslamicCalendarAstro; |
| gIslamicCalendarAstro = NULL; |
| } |
| return TRUE; |
| } |
| U_CDECL_END |
| |
| U_NAMESPACE_BEGIN |
| |
| // Implementation of the IslamicCalendar class |
| |
| /** |
| * Friday EPOC |
| */ |
| static const int32_t CIVIL_EPOC = 1948440; |
| |
| /** |
| * Thursday EPOC |
| */ |
| static const int32_t ASTRONOMICAL_EPOC = 1948439; |
| |
| |
| static const int32_t UMALQURA_YEAR_START = 1318; |
| static const int32_t UMALQURA_YEAR_END = 1480; |
| |
| static const int UMALQURA_MONTHLENGTH[] = { |
| //* 1318 -1322 */ "0101 0111 0100", "1001 0111 0110", "0100 1011 0111", "0010 0101 0111", "0101 0010 1011", |
| 0x0574, 0x0975, 0x06A7, 0x0257, 0x052B, |
| //* 1323 -1327 */ "0110 1001 0101", "0110 1100 1010", "1010 1101 0101", "0101 0101 1011", "0010 0101 1101", |
| 0x0695, 0x06CA, 0x0AD5, 0x055B, 0x025B, |
| //* 1328 -1332 */ "1001 0010 1101", "1100 1001 0101", "1101 0100 1010", "1110 1010 0101", "0110 1101 0010", |
| 0x092D, 0x0C95, 0x0D4A, 0x0E5B, 0x025B, |
| //* 1333 -1337 */ "1010 1101 0101", "0101 0101 1010", "1010 1010 1011", "0100 0100 1011", "0110 1010 0101", |
| 0x0AD5, 0x055A, 0x0AAB, 0x044B, 0x06A5, |
| //* 1338 -1342 */ "0111 0101 0010", "1011 1010 1001", "0011 0111 0100", "1010 1011 0110", "0101 0101 0110", |
| 0x0752, 0x0BA9, 0x0374, 0x0AB6, 0x0556, |
| //* 1343 -1347 */ "1010 1010 1010", "1101 0101 0010", "1101 1010 1001", "0101 1101 0100", "1010 1110 1010", |
| 0x0AAA, 0x0D52, 0x0DA9, 0x05D4, 0x0AEA, |
| //* 1348 -1352 */ "0100 1101 1101", "0010 0110 1110", "1001 0010 1110", "1010 1010 0110", "1101 0101 0100", |
| 0x04DD, 0x026E, 0x092E, 0x0AA6, 0x0D54, |
| //* 1353 -1357 */ "0101 1010 1010", "0101 1011 0101", "0010 1011 0100", "1001 0011 0111", "0100 1001 1011", |
| 0x05AA, 0x05B5, 0x02B4, 0x0937, 0x049B, |
| //* 1358 -1362 */ "1010 0100 1011", "1011 0010 0101", "1011 0101 0100", "1011 0110 1010", "0101 0110 1101", |
| 0x0A4B, 0x0B25, 0x0B54, 0x0B6A, 0x056D, |
| //* 1363 -1367 */ "0100 1010 1101", "1010 0101 0101", "1101 0010 0101", "1110 1001 0010", "1110 1100 1001", |
| 0x04AD, 0x0A55, 0x0D25, 0x0E92, 0x0EC9, |
| //* 1368 -1372 */ "0110 1101 0100", "1010 1110 1010", "0101 0110 1011", "0100 1010 1011", "0110 1000 0101", |
| 0x06D4, 0x0ADA, 0x056B, 0x04AB, 0x0685, |
| //* 1373 -1377 */ "1011 0100 1001", "1011 1010 0100", "1011 1011 0010", "0101 1011 0101", "0010 1011 1010", |
| 0x0B49, 0x0BA4, 0x0BB2, 0x05B5, 0x02BA, |
| //* 1378 -1382 */ "1001 0101 1011", "0100 1010 1011", "0101 0101 0101", "0110 1011 0010", "0110 1101 1001", |
| 0x095B, 0x04AB, 0x0555, 0x06B2, 0x06D9, |
| //* 1383 -1387 */ "0010 1110 1100", "1001 0110 1110", "0100 1010 1110", "1010 0101 0110", "1101 0010 1010", |
| 0x02EC, 0x096E, 0x04AE, 0x0A56, 0x0D2A, |
| //* 1388 -1392 */ "1101 0101 0101", "0101 1010 1010", "1010 1011 0101", "0100 1011 1011", "0000 0101 1011", |
| 0x0D55, 0x05AA, 0x0AB5, 0x04BB, 0x005B, |
| //* 1393 -1397 */ "1001 0010 1011", "1010 1001 0101", "0011 0100 1010", "1011 1010 0101", "0101 1010 1010", |
| 0x092B, 0x0A95, 0x034A, 0x0BA5, 0x05AA, |
| //* 1398 -1402 */ "1010 1011 0101", "0101 0101 0110", "1010 1001 0110", "1101 0100 1010", "1110 1010 0101", |
| 0x0AB5, 0x0556, 0x0A96, 0x0B4A, 0x0EA5, |
| //* 1403 -1407 */ "0111 0101 0010", "0110 1110 1001", "0011 0110 1010", "1010 1010 1101", "0101 0101 0101", |
| 0x0752, 0x06E9, 0x036A, 0x0AAD, 0x0555, |
| //* 1408 -1412 */ "1010 1010 0101", "1011 0101 0010", "1011 1010 1001", "0101 1011 0100", "1001 1011 1010", |
| 0x0AA5, 0x0B52, 0x0BA9, 0x05B4, 0x09BA, |
| //* 1413 -1417 */ "0100 1101 1011", "0010 0101 1101", "0101 0010 1101", "1010 1010 0101", "1010 1101 0100", |
| 0x04DB, 0x025D, 0x052D, 0x0AA5, 0x0AD4, |
| //* 1418 -1422 */ "1010 1110 1010", "0101 0110 1101", "0100 1011 1101", "0010 0011 1101", "1001 0001 1101", |
| 0x0AEA, 0x056D, 0x04BD, 0x023D, 0x091D, |
| //* 1423 -1427 */ "1010 1001 0101", "1011 0100 1010", "1011 0101 1010", "0101 0110 1101", "0010 1011 0110", |
| 0x0A95, 0x0B4A, 0x0B5A, 0x056D, 0x02B6, |
| //* 1428 -1432 */ "1001 0011 1011", "0100 1001 1011", "0110 0101 0101", "0110 1010 1001", "0111 0101 0100", |
| 0x093B, 0x049B, 0x0655, 0x06A9, 0x0754, |
| //* 1433 -1437 */ "1011 0110 1010", "0101 0110 1100", "1010 1010 1101", "0101 0101 0101", "1011 0010 1001", |
| 0x0B6A, 0x056C, 0x0AAD, 0x0555, 0x0B29, |
| //* 1438 -1442 */ "1011 1001 0010", "1011 1010 1001", "0101 1101 0100", "1010 1101 1010", "0101 0101 1010", |
| 0x0B92, 0x0BA9, 0x05D4, 0x0ADA, 0x055A, |
| //* 1443 -1447 */ "1010 1010 1011", "0101 1001 0101", "0111 0100 1001", "0111 0110 0100", "1011 1010 1010", |
| 0x0AAB, 0x0595, 0x0749, 0x0764, 0x0BAA, |
| //* 1448 -1452 */ "0101 1011 0101", "0010 1011 0110", "1010 0101 0110", "1110 0100 1101", "1011 0010 0101", |
| 0x05B5, 0x02B6, 0x0A56, 0x0E4D, 0x0B25, |
| //* 1453 -1457 */ "1011 0101 0010", "1011 0110 1010", "0101 1010 1101", "0010 1010 1110", "1001 0010 1111", |
| 0x0B52, 0x0B6A, 0x05AD, 0x02AE, 0x092F, |
| //* 1458 -1462 */ "0100 1001 0111", "0110 0100 1011", "0110 1010 0101", "0110 1010 1100", "1010 1101 0110", |
| 0x0497, 0x064B, 0x06A5, 0x06AC, 0x0AD6, |
| //* 1463 -1467 */ "0101 0101 1101", "0100 1001 1101", "1010 0100 1101", "1101 0001 0110", "1101 1001 0101", |
| 0x055D, 0x049D, 0x0A4D, 0x0D16, 0x0D95, |
| //* 1468 -1472 */ "0101 1010 1010", "0101 1011 0101", "0010 1001 1010", "1001 0101 1011", "0100 1010 1100", |
| 0x05AA, 0x05B5, 0x029A, 0x095B, 0x04AC, |
| //* 1473 -1477 */ "0101 1001 0101", "0110 1100 1010", "0110 1110 0100", "1010 1110 1010", "0100 1111 0101", |
| 0x0595, 0x06CA, 0x06E4, 0x0AEA, 0x04F5, |
| //* 1478 -1480 */ "0010 1011 0110", "1001 0101 0110", "1010 1010 1010" |
| 0x02B6, 0x0956, 0x0AAA |
| }; |
| |
| int32_t getUmalqura_MonthLength(int32_t y, int32_t m) { |
| int32_t mask = (int32_t) (0x01 << (11 - m)); // set mask for bit corresponding to month |
| if((UMALQURA_MONTHLENGTH[y] & mask) == 0 ) |
| return 29; |
| else |
| return 30; |
| |
| } |
| |
| //------------------------------------------------------------------------- |
| // Constructors... |
| //------------------------------------------------------------------------- |
| |
| const char *IslamicCalendar::getType() const { |
| const char *sType = NULL; |
| |
| switch (cType) { |
| case CIVIL: |
| sType = "islamic-civil"; |
| break; |
| case ASTRONOMICAL: |
| sType = "islamic"; |
| break; |
| case TBLA: |
| sType = "islamic-tbla"; |
| break; |
| case UMALQURA: |
| sType = "islamic-umalqura"; |
| break; |
| default: |
| U_ASSERT(false); // out of range |
| sType = "islamic"; // "islamic" is used as the generic type |
| break; |
| } |
| return sType; |
| } |
| |
| Calendar* IslamicCalendar::clone() const { |
| return new IslamicCalendar(*this); |
| } |
| |
| IslamicCalendar::IslamicCalendar(const Locale& aLocale, UErrorCode& success, ECalculationType type) |
| : Calendar(TimeZone::createDefault(), aLocale, success), |
| cType(type) |
| { |
| setTimeInMillis(getNow(), success); // Call this again now that the vtable is set up properly. |
| } |
| |
| IslamicCalendar::IslamicCalendar(const IslamicCalendar& other) : Calendar(other), cType(other.cType) { |
| } |
| |
| IslamicCalendar::~IslamicCalendar() |
| { |
| } |
| |
| void IslamicCalendar::setCalculationType(ECalculationType type, UErrorCode &status) |
| { |
| if (cType != type) { |
| // The fields of the calendar will become invalid, because the calendar |
| // rules are different |
| UDate m = getTimeInMillis(status); |
| cType = type; |
| clear(); |
| setTimeInMillis(m, status); |
| } |
| } |
| |
| /** |
| * Returns <code>true</code> if this object is using the fixed-cycle civil |
| * calendar, or <code>false</code> if using the religious, astronomical |
| * calendar. |
| * @draft ICU 2.4 |
| */ |
| UBool IslamicCalendar::isCivil() { |
| return (cType == CIVIL); |
| } |
| |
| //------------------------------------------------------------------------- |
| // Minimum / Maximum access functions |
| //------------------------------------------------------------------------- |
| |
| // Note: Current IslamicCalendar implementation does not work |
| // well with negative years. |
| |
| // TODO: In some cases the current ICU Islamic calendar implementation shows |
| // a month as having 31 days. Since date parsing now uses range checks based |
| // on the table below, we need to change the range for last day of month to |
| // include 31 as a workaround until the implementation is fixed. |
| static const int32_t LIMITS[UCAL_FIELD_COUNT][4] = { |
| // Minimum Greatest Least Maximum |
| // Minimum Maximum |
| { 0, 0, 0, 0}, // ERA |
| { 1, 1, 5000000, 5000000}, // YEAR |
| { 0, 0, 11, 11}, // MONTH |
| { 1, 1, 50, 51}, // WEEK_OF_YEAR |
| {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // WEEK_OF_MONTH |
| { 1, 1, 29, 31}, // DAY_OF_MONTH - 31 to workaround for cal implementation bug, should be 30 |
| { 1, 1, 354, 355}, // DAY_OF_YEAR |
| {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // DAY_OF_WEEK |
| { -1, -1, 5, 5}, // DAY_OF_WEEK_IN_MONTH |
| {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // AM_PM |
| {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // HOUR |
| {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // HOUR_OF_DAY |
| {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // MINUTE |
| {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // SECOND |
| {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // MILLISECOND |
| {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // ZONE_OFFSET |
| {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // DST_OFFSET |
| { 1, 1, 5000000, 5000000}, // YEAR_WOY |
| {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // DOW_LOCAL |
| { 1, 1, 5000000, 5000000}, // EXTENDED_YEAR |
| {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // JULIAN_DAY |
| {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // MILLISECONDS_IN_DAY |
| {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // IS_LEAP_MONTH |
| }; |
| |
| /** |
| * @draft ICU 2.4 |
| */ |
| int32_t IslamicCalendar::handleGetLimit(UCalendarDateFields field, ELimitType limitType) const { |
| return LIMITS[field][limitType]; |
| } |
| |
| //------------------------------------------------------------------------- |
| // Assorted calculation utilities |
| // |
| |
| /** |
| * Determine whether a year is a leap year in the Islamic civil calendar |
| */ |
| UBool IslamicCalendar::civilLeapYear(int32_t year) |
| { |
| return (14 + 11 * year) % 30 < 11; |
| } |
| |
| /** |
| * Return the day # on which the given year starts. Days are counted |
| * from the Hijri epoch, origin 0. |
| */ |
| int32_t IslamicCalendar::yearStart(int32_t year) const{ |
| if (cType == CIVIL || cType == TBLA || |
| (cType == UMALQURA && year < UMALQURA_YEAR_START)) |
| { |
| return (year-1)*354 + ClockMath::floorDivide((3+11*year),30); |
| } else if(cType==ASTRONOMICAL){ |
| return trueMonthStart(12*(year-1)); |
| } else { |
| int32_t ys = yearStart(UMALQURA_YEAR_START-1); |
| ys+= handleGetYearLength(UMALQURA_YEAR_START-1); |
| for(int i=UMALQURA_YEAR_START; i< year; i++){ |
| ys+= handleGetYearLength(i); |
| } |
| return ys; |
| } |
| } |
| |
| /** |
| * Return the day # on which the given month starts. Days are counted |
| * from the Hijri epoch, origin 0. |
| * |
| * @param year The hijri year |
| * @param year The hijri month, 0-based |
| */ |
| int32_t IslamicCalendar::monthStart(int32_t year, int32_t month) const { |
| if (cType == CIVIL || cType == TBLA) { |
| return (int32_t)uprv_ceil(29.5*month) |
| + (year-1)*354 + (int32_t)ClockMath::floorDivide((3+11*year),30); |
| } else if(cType==ASTRONOMICAL){ |
| return trueMonthStart(12*(year-1) + month); |
| } else { |
| int32_t ms = yearStart(year); |
| for(int i=0; i< month; i++){ |
| ms+= handleGetMonthLength(year, i); |
| } |
| return ms; |
| } |
| } |
| |
| /** |
| * Find the day number on which a particular month of the true/lunar |
| * Islamic calendar starts. |
| * |
| * @param month The month in question, origin 0 from the Hijri epoch |
| * |
| * @return The day number on which the given month starts. |
| */ |
| int32_t IslamicCalendar::trueMonthStart(int32_t month) const |
| { |
| UErrorCode status = U_ZERO_ERROR; |
| int32_t start = CalendarCache::get(&gMonthCache, month, status); |
| |
| if (start==0) { |
| // Make a guess at when the month started, using the average length |
| UDate origin = HIJRA_MILLIS |
| + uprv_floor(month * CalendarAstronomer::SYNODIC_MONTH) * kOneDay; |
| |
| // moonAge will fail due to memory allocation error |
| double age = moonAge(origin, status); |
| if (U_FAILURE(status)) { |
| goto trueMonthStartEnd; |
| } |
| |
| if (age >= 0) { |
| // The month has already started |
| do { |
| origin -= kOneDay; |
| age = moonAge(origin, status); |
| if (U_FAILURE(status)) { |
| goto trueMonthStartEnd; |
| } |
| } while (age >= 0); |
| } |
| else { |
| // Preceding month has not ended yet. |
| do { |
| origin += kOneDay; |
| age = moonAge(origin, status); |
| if (U_FAILURE(status)) { |
| goto trueMonthStartEnd; |
| } |
| } while (age < 0); |
| } |
| start = (int32_t)ClockMath::floorDivide((origin - HIJRA_MILLIS), (double)kOneDay) + 1; |
| CalendarCache::put(&gMonthCache, month, start, status); |
| } |
| trueMonthStartEnd : |
| if(U_FAILURE(status)) { |
| start = 0; |
| } |
| return start; |
| } |
| |
| /** |
| * Return the "age" of the moon at the given time; this is the difference |
| * in ecliptic latitude between the moon and the sun. This method simply |
| * calls CalendarAstronomer.moonAge, converts to degrees, |
| * and adjusts the result to be in the range [-180, 180]. |
| * |
| * @param time The time at which the moon's age is desired, |
| * in millis since 1/1/1970. |
| */ |
| double IslamicCalendar::moonAge(UDate time, UErrorCode &status) |
| { |
| double age = 0; |
| |
| umtx_lock(&astroLock); |
| if(gIslamicCalendarAstro == NULL) { |
| gIslamicCalendarAstro = new CalendarAstronomer(); |
| if (gIslamicCalendarAstro == NULL) { |
| status = U_MEMORY_ALLOCATION_ERROR; |
| return age; |
| } |
| ucln_i18n_registerCleanup(UCLN_I18N_ISLAMIC_CALENDAR, calendar_islamic_cleanup); |
| } |
| gIslamicCalendarAstro->setTime(time); |
| age = gIslamicCalendarAstro->getMoonAge(); |
| umtx_unlock(&astroLock); |
| |
| // Convert to degrees and normalize... |
| age = age * 180 / CalendarAstronomer::PI; |
| if (age > 180) { |
| age = age - 360; |
| } |
| |
| return age; |
| } |
| |
| //---------------------------------------------------------------------- |
| // Calendar framework |
| //---------------------------------------------------------------------- |
| |
| /** |
| * Return the length (in days) of the given month. |
| * |
| * @param year The hijri year |
| * @param year The hijri month, 0-based |
| * @draft ICU 2.4 |
| */ |
| int32_t IslamicCalendar::handleGetMonthLength(int32_t extendedYear, int32_t month) const { |
| |
| int32_t length = 0; |
| |
| if (cType == CIVIL || cType == TBLA || |
| (cType == UMALQURA && (extendedYear<UMALQURA_YEAR_START || extendedYear>UMALQURA_YEAR_END)) ) { |
| length = 29 + (month+1) % 2; |
| if (month == DHU_AL_HIJJAH && civilLeapYear(extendedYear)) { |
| length++; |
| } |
| } else if(cType == ASTRONOMICAL){ |
| month = 12*(extendedYear-1) + month; |
| length = trueMonthStart(month+1) - trueMonthStart(month) ; |
| } else { |
| length = getUmalqura_MonthLength(extendedYear - UMALQURA_YEAR_START, month); |
| } |
| return length; |
| } |
| |
| /** |
| * Return the number of days in the given Islamic year |
| * @draft ICU 2.4 |
| */ |
| int32_t IslamicCalendar::handleGetYearLength(int32_t extendedYear) const { |
| if (cType == CIVIL || cType == TBLA || |
| (cType == UMALQURA && (extendedYear<UMALQURA_YEAR_START || extendedYear>UMALQURA_YEAR_END)) ) { |
| return 354 + (civilLeapYear(extendedYear) ? 1 : 0); |
| } else if(cType == ASTRONOMICAL){ |
| int32_t month = 12*(extendedYear-1); |
| return (trueMonthStart(month + 12) - trueMonthStart(month)); |
| } else { |
| int len = 0; |
| for(int i=0; i<12; i++) |
| len += handleGetMonthLength(extendedYear, i); |
| return len; |
| } |
| } |
| |
| //------------------------------------------------------------------------- |
| // Functions for converting from field values to milliseconds.... |
| //------------------------------------------------------------------------- |
| |
| // Return JD of start of given month/year |
| /** |
| * @draft ICU 2.4 |
| */ |
| int32_t IslamicCalendar::handleComputeMonthStart(int32_t eyear, int32_t month, UBool /* useMonth */) const { |
| return monthStart(eyear, month) + 1948439; |
| } |
| |
| //------------------------------------------------------------------------- |
| // Functions for converting from milliseconds to field values |
| //------------------------------------------------------------------------- |
| |
| /** |
| * @draft ICU 2.4 |
| */ |
| int32_t IslamicCalendar::handleGetExtendedYear() { |
| int32_t year; |
| if (newerField(UCAL_EXTENDED_YEAR, UCAL_YEAR) == UCAL_EXTENDED_YEAR) { |
| year = internalGet(UCAL_EXTENDED_YEAR, 1); // Default to year 1 |
| } else { |
| year = internalGet(UCAL_YEAR, 1); // Default to year 1 |
| } |
| return year; |
| } |
| |
| /** |
| * Override Calendar to compute several fields specific to the Islamic |
| * calendar system. These are: |
| * |
| * <ul><li>ERA |
| * <li>YEAR |
| * <li>MONTH |
| * <li>DAY_OF_MONTH |
| * <li>DAY_OF_YEAR |
| * <li>EXTENDED_YEAR</ul> |
| * |
| * The DAY_OF_WEEK and DOW_LOCAL fields are already set when this |
| * method is called. The getGregorianXxx() methods return Gregorian |
| * calendar equivalents for the given Julian day. |
| * @draft ICU 2.4 |
| */ |
| void IslamicCalendar::handleComputeFields(int32_t julianDay, UErrorCode &status) { |
| int32_t year, month, dayOfMonth, dayOfYear; |
| UDate startDate; |
| int32_t days = julianDay - CIVIL_EPOC; |
| |
| if (cType == CIVIL || cType == TBLA) { |
| if(cType == TBLA) |
| days = julianDay - ASTRONOMICAL_EPOC; |
| // Use the civil calendar approximation, which is just arithmetic |
| year = (int)ClockMath::floorDivide( (double)(30 * days + 10646) , 10631.0 ); |
| month = (int32_t)uprv_ceil((days - 29 - yearStart(year)) / 29.5 ); |
| month = month<11?month:11; |
| startDate = monthStart(year, month); |
| } else if(cType == ASTRONOMICAL){ |
| // Guess at the number of elapsed full months since the epoch |
| int32_t months = (int32_t)uprv_floor((double)days / CalendarAstronomer::SYNODIC_MONTH); |
| |
| startDate = uprv_floor(months * CalendarAstronomer::SYNODIC_MONTH); |
| |
| double age = moonAge(internalGetTime(), status); |
| if (U_FAILURE(status)) { |
| status = U_MEMORY_ALLOCATION_ERROR; |
| return; |
| } |
| if ( days - startDate >= 25 && age > 0) { |
| // If we're near the end of the month, assume next month and search backwards |
| months++; |
| } |
| |
| // Find out the last time that the new moon was actually visible at this longitude |
| // This returns midnight the night that the moon was visible at sunset. |
| while ((startDate = trueMonthStart(months)) > days) { |
| // If it was after the date in question, back up a month and try again |
| months--; |
| } |
| |
| year = months / 12 + 1; |
| month = months % 12; |
| } else if(cType == UMALQURA) { |
| int32_t umalquraStartdays = yearStart(UMALQURA_YEAR_START) ; |
| if( days < umalquraStartdays){ |
| //Use Civil calculation |
| year = (int)ClockMath::floorDivide( (double)(30 * days + 10646) , 10631.0 ); |
| month = (int32_t)uprv_ceil((days - 29 - yearStart(year)) / 29.5 ); |
| month = month<11?month:11; |
| startDate = monthStart(year, month); |
| }else{ |
| int y =UMALQURA_YEAR_START-1, m =0; |
| long d = 1; |
| while(d > 0){ |
| y++; |
| d = days - yearStart(y) +1; |
| if(d == handleGetYearLength(y)){ |
| m=11; |
| break; |
| }else if(d < handleGetYearLength(y) ){ |
| int monthLen = handleGetMonthLength(y, m); |
| m=0; |
| while(d > monthLen){ |
| d -= monthLen; |
| m++; |
| monthLen = handleGetMonthLength(y, m); |
| } |
| break; |
| } |
| } |
| year = y; |
| month = m; |
| } |
| } else { // invalid 'civil' |
| U_ASSERT(false); // should not get here, out of range |
| year=month=0; |
| } |
| |
| dayOfMonth = (days - monthStart(year, month)) + 1; |
| |
| // Now figure out the day of the year. |
| dayOfYear = (days - monthStart(year, 0) + 1); |
| |
| |
| internalSet(UCAL_ERA, 0); |
| internalSet(UCAL_YEAR, year); |
| internalSet(UCAL_EXTENDED_YEAR, year); |
| internalSet(UCAL_MONTH, month); |
| internalSet(UCAL_DAY_OF_MONTH, dayOfMonth); |
| internalSet(UCAL_DAY_OF_YEAR, dayOfYear); |
| } |
| |
| UBool |
| IslamicCalendar::inDaylightTime(UErrorCode& status) const |
| { |
| // copied from GregorianCalendar |
| if (U_FAILURE(status) || (&(getTimeZone()) == NULL && !getTimeZone().useDaylightTime())) |
| return FALSE; |
| |
| // Force an update of the state of the Calendar. |
| ((IslamicCalendar*)this)->complete(status); // cast away const |
| |
| return (UBool)(U_SUCCESS(status) ? (internalGet(UCAL_DST_OFFSET) != 0) : FALSE); |
| } |
| |
| /** |
| * The system maintains a static default century start date and Year. They are |
| * initialized the first time they are used. Once the system default century date |
| * and year are set, they do not change. |
| */ |
| static UDate gSystemDefaultCenturyStart = DBL_MIN; |
| static int32_t gSystemDefaultCenturyStartYear = -1; |
| static icu::UInitOnce gSystemDefaultCenturyInit = U_INITONCE_INITIALIZER; |
| |
| |
| UBool IslamicCalendar::haveDefaultCentury() const |
| { |
| return TRUE; |
| } |
| |
| UDate IslamicCalendar::defaultCenturyStart() const |
| { |
| // lazy-evaluate systemDefaultCenturyStart |
| umtx_initOnce(gSystemDefaultCenturyInit, &initializeSystemDefaultCentury); |
| return gSystemDefaultCenturyStart; |
| } |
| |
| int32_t IslamicCalendar::defaultCenturyStartYear() const |
| { |
| // lazy-evaluate systemDefaultCenturyStartYear |
| umtx_initOnce(gSystemDefaultCenturyInit, &initializeSystemDefaultCentury); |
| return gSystemDefaultCenturyStartYear; |
| } |
| |
| |
| void U_CALLCONV |
| IslamicCalendar::initializeSystemDefaultCentury() |
| { |
| // initialize systemDefaultCentury and systemDefaultCenturyYear based |
| // on the current time. They'll be set to 80 years before |
| // the current time. |
| UErrorCode status = U_ZERO_ERROR; |
| IslamicCalendar calendar(Locale("@calendar=islamic-civil"),status); |
| if (U_SUCCESS(status)) { |
| calendar.setTime(Calendar::getNow(), status); |
| calendar.add(UCAL_YEAR, -80, status); |
| |
| gSystemDefaultCenturyStart = calendar.getTime(status); |
| gSystemDefaultCenturyStartYear = calendar.get(UCAL_YEAR, status); |
| } |
| // We have no recourse upon failure unless we want to propagate the failure |
| // out. |
| } |
| |
| |
| |
| UOBJECT_DEFINE_RTTI_IMPLEMENTATION(IslamicCalendar) |
| |
| U_NAMESPACE_END |
| |
| #endif |
| |
