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+/*
+******************************************************************************
+* Copyright (C) 2003-2006, 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"
+
+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 UMTX astroLock = 0; // pod bay door lock
+static U_NAMESPACE_QUALIFIER CalendarCache *gMonthCache = NULL;
+static U_NAMESPACE_QUALIFIER CalendarAstronomer *gIslamicCalendarAstro = NULL;
+
+U_CDECL_BEGIN
+static UBool calendar_islamic_cleanup(void) {
+ if (gMonthCache) {
+ delete gMonthCache;
+ gMonthCache = NULL;
+ }
+ if (gIslamicCalendarAstro) {
+ delete gIslamicCalendarAstro;
+ gIslamicCalendarAstro = NULL;
+ }
+ umtx_destroy(&astroLock);
+ return TRUE;
+}
+U_CDECL_END
+
+U_NAMESPACE_BEGIN
+
+// Implementation of the IslamicCalendar class
+
+//-------------------------------------------------------------------------
+// Constructors...
+//-------------------------------------------------------------------------
+
+const char *IslamicCalendar::getType() const {
+ if(civil==CIVIL) {
+ return "islamic-civil";
+ } else {
+ return "islamic";
+ }
+}
+
+Calendar* IslamicCalendar::clone() const {
+ return new IslamicCalendar(*this);
+}
+
+IslamicCalendar::IslamicCalendar(const Locale& aLocale, UErrorCode& success, ECivil beCivil)
+: Calendar(TimeZone::createDefault(), aLocale, success),
+civil(beCivil)
+{
+ setTimeInMillis(getNow(), success); // Call this again now that the vtable is set up properly.
+}
+
+IslamicCalendar::IslamicCalendar(const IslamicCalendar& other) : Calendar(other), civil(other.civil) {
+}
+
+IslamicCalendar::~IslamicCalendar()
+{
+}
+
+/**
+* Determines whether this object uses the fixed-cycle Islamic civil calendar
+* or an approximation of the religious, astronomical calendar.
+*
+* @param beCivil <code>true</code> to use the civil calendar,
+* <code>false</code> to use the astronomical calendar.
+* @draft ICU 2.4
+*/
+void IslamicCalendar::setCivil(ECivil beCivil, UErrorCode &status)
+{
+ if (civil != beCivil) {
+ // The fields of the calendar will become invalid, because the calendar
+ // rules are different
+ UDate m = getTimeInMillis(status);
+ civil = beCivil;
+ 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 (civil == CIVIL);
+}
+
+//-------------------------------------------------------------------------
+// Minimum / Maximum access functions
+//-------------------------------------------------------------------------
+
+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
+ { 0, 0, 4, 6 }, // WEEK_OF_MONTH
+ { 1, 1, 29, 30 }, // DAY_OF_MONTH
+ { 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, 5000001, 5000001 }, // 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
+};
+
+/**
+* @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) {
+ if (civil == CIVIL) {
+ return (year-1)*354 + Math::floorDivide((3+11*year),30);
+ } else {
+ return trueMonthStart(12*(year-1));
+ }
+}
+
+/**
+* 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 (civil == CIVIL) {
+ return (int32_t)uprv_ceil(29.5*month)
+ + (year-1)*354 + (int32_t)Math::floorDivide((3+11*year),30);
+ } else {
+ return trueMonthStart(12*(year-1) + month);
+ }
+}
+
+/**
+* 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 - 1) * kOneDay;
+
+ double age = moonAge(origin);
+
+ if (moonAge(origin) >= 0) {
+ // The month has already started
+ do {
+ origin -= kOneDay;
+ age = moonAge(origin);
+ } while (age >= 0);
+ }
+ else {
+ // Preceding month has not ended yet.
+ do {
+ origin += kOneDay;
+ age = moonAge(origin);
+ } while (age < 0);
+ }
+ start = (int32_t)Math::floorDivide((origin - HIJRA_MILLIS), (double)kOneDay) + 1;
+ CalendarCache::put(&gMonthCache, month, start, status);
+ }
+ 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)
+{
+ double age = 0;
+
+ umtx_lock(&astroLock);
+ if(gIslamicCalendarAstro == NULL) {
+ gIslamicCalendarAstro = new CalendarAstronomer();
+ }
+ gIslamicCalendarAstro->setTime(time);
+ age = gIslamicCalendarAstro->getMoonAge();
+ ucln_i18n_registerCleanup(UCLN_I18N_ISLAMIC_CALENDAR, calendar_islamic_cleanup);
+ 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 (civil == CIVIL) {
+ length = 29 + (month+1) % 2;
+ if (month == DHU_AL_HIJJAH && civilLeapYear(extendedYear)) {
+ length++;
+ }
+ } else {
+ month = 12*(extendedYear-1) + month;
+ length = trueMonthStart(month+1) - trueMonthStart(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 (civil == CIVIL) {
+ return 354 + (civilLeapYear(extendedYear) ? 1 : 0);
+ } else {
+ int32_t month = 12*(extendedYear-1);
+ return (trueMonthStart(month + 12) - trueMonthStart(month));
+ }
+}
+
+//-------------------------------------------------------------------------
+// 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 - 1948440;
+
+ if (civil == CIVIL) {
+ // Use the civil calendar approximation, which is just arithmetic
+ year = (int)Math::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 {
+ // 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 - 1);
+
+ if ( days - startDate >= 28 && moonAge(internalGetTime()) > 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;
+ }
+
+ 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().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);
+}
+
+// default century
+const UDate IslamicCalendar::fgSystemDefaultCentury = DBL_MIN;
+const int32_t IslamicCalendar::fgSystemDefaultCenturyYear = -1;
+
+UDate IslamicCalendar::fgSystemDefaultCenturyStart = DBL_MIN;
+int32_t IslamicCalendar::fgSystemDefaultCenturyStartYear = -1;
+
+
+UBool IslamicCalendar::haveDefaultCentury() const
+{
+ return TRUE;
+}
+
+UDate IslamicCalendar::defaultCenturyStart() const
+{
+ return internalGetDefaultCenturyStart();
+}
+
+int32_t IslamicCalendar::defaultCenturyStartYear() const
+{
+ return internalGetDefaultCenturyStartYear();
+}
+
+UDate
+IslamicCalendar::internalGetDefaultCenturyStart() const
+{
+ // lazy-evaluate systemDefaultCenturyStart
+ UBool needsUpdate;
+ UMTX_CHECK(NULL, (fgSystemDefaultCenturyStart == fgSystemDefaultCentury), needsUpdate);
+
+ if (needsUpdate) {
+ initializeSystemDefaultCentury();
+ }
+
+ // use defaultCenturyStart unless it's the flag value;
+ // then use systemDefaultCenturyStart
+
+ return fgSystemDefaultCenturyStart;
+}
+
+int32_t
+IslamicCalendar::internalGetDefaultCenturyStartYear() const
+{
+ // lazy-evaluate systemDefaultCenturyStartYear
+ UBool needsUpdate;
+ UMTX_CHECK(NULL, (fgSystemDefaultCenturyStart == fgSystemDefaultCentury), needsUpdate);
+
+ if (needsUpdate) {
+ initializeSystemDefaultCentury();
+ }
+
+ // use defaultCenturyStart unless it's the flag value;
+ // then use systemDefaultCenturyStartYear
+
+ return fgSystemDefaultCenturyStartYear;
+}
+
+void
+IslamicCalendar::initializeSystemDefaultCentury()
+{
+ // initialize systemDefaultCentury and systemDefaultCenturyYear based
+ // on the current time. They'll be set to 80 years before
+ // the current time.
+ // No point in locking as it should be idempotent.
+ if (fgSystemDefaultCenturyStart == fgSystemDefaultCentury)
+ {
+ 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);
+ UDate newStart = calendar.getTime(status);
+ int32_t newYear = calendar.get(UCAL_YEAR, status);
+ {
+ umtx_lock(NULL);
+ fgSystemDefaultCenturyStart = newStart;
+ fgSystemDefaultCenturyStartYear = newYear;
+ umtx_unlock(NULL);
+ }
+ }
+ // We have no recourse upon failure unless we want to propagate the failure
+ // out.
+ }
+}
+
+UOBJECT_DEFINE_RTTI_IMPLEMENTATION(IslamicCalendar)
+
+U_NAMESPACE_END
+
+#endif
+