/*
******************************************************************************
* 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