525 lines
16 KiB
C++
525 lines
16 KiB
C++
/*
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******************************************************************************
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* Copyright (C) 2003-2006, International Business Machines Corporation
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* and others. All Rights Reserved.
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******************************************************************************
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*
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* File ISLAMCAL.H
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*
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* Modification History:
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*
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* Date Name Description
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* 10/14/2003 srl ported from java IslamicCalendar
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*****************************************************************************
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*/
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#include "islamcal.h"
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#if !UCONFIG_NO_FORMATTING
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#include "umutex.h"
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#include <float.h>
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#include "gregoimp.h" // Math
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#include "astro.h" // CalendarAstronomer
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#include "uhash.h"
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#include "ucln_in.h"
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static const UDate HIJRA_MILLIS = -42521587200000.0; // 7/16/622 AD 00:00
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// Debugging
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#ifdef U_DEBUG_ISLAMCAL
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# include <stdio.h>
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# include <stdarg.h>
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static void debug_islamcal_loc(const char *f, int32_t l)
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{
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fprintf(stderr, "%s:%d: ", f, l);
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}
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static void debug_islamcal_msg(const char *pat, ...)
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{
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va_list ap;
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va_start(ap, pat);
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vfprintf(stderr, pat, ap);
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fflush(stderr);
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}
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// must use double parens, i.e.: U_DEBUG_ISLAMCAL_MSG(("four is: %d",4));
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#define U_DEBUG_ISLAMCAL_MSG(x) {debug_islamcal_loc(__FILE__,__LINE__);debug_islamcal_msg x;}
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#else
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#define U_DEBUG_ISLAMCAL_MSG(x)
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#endif
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// --- The cache --
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// cache of months
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static UMTX astroLock = 0; // pod bay door lock
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static U_NAMESPACE_QUALIFIER CalendarCache *gMonthCache = NULL;
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static U_NAMESPACE_QUALIFIER CalendarAstronomer *gIslamicCalendarAstro = NULL;
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U_CDECL_BEGIN
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static UBool calendar_islamic_cleanup(void) {
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if (gMonthCache) {
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delete gMonthCache;
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gMonthCache = NULL;
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}
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if (gIslamicCalendarAstro) {
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delete gIslamicCalendarAstro;
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gIslamicCalendarAstro = NULL;
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}
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umtx_destroy(&astroLock);
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return TRUE;
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}
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U_CDECL_END
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U_NAMESPACE_BEGIN
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// Implementation of the IslamicCalendar class
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//-------------------------------------------------------------------------
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// Constructors...
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//-------------------------------------------------------------------------
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const char *IslamicCalendar::getType() const {
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if(civil==CIVIL) {
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return "islamic-civil";
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} else {
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return "islamic";
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}
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}
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Calendar* IslamicCalendar::clone() const {
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return new IslamicCalendar(*this);
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}
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IslamicCalendar::IslamicCalendar(const Locale& aLocale, UErrorCode& success, ECivil beCivil)
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: Calendar(TimeZone::createDefault(), aLocale, success),
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civil(beCivil)
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{
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setTimeInMillis(getNow(), success); // Call this again now that the vtable is set up properly.
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}
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IslamicCalendar::IslamicCalendar(const IslamicCalendar& other) : Calendar(other), civil(other.civil) {
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}
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IslamicCalendar::~IslamicCalendar()
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{
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}
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/**
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* Determines whether this object uses the fixed-cycle Islamic civil calendar
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* or an approximation of the religious, astronomical calendar.
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*
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* @param beCivil <code>true</code> to use the civil calendar,
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* <code>false</code> to use the astronomical calendar.
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* @draft ICU 2.4
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*/
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void IslamicCalendar::setCivil(ECivil beCivil, UErrorCode &status)
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{
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if (civil != beCivil) {
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// The fields of the calendar will become invalid, because the calendar
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// rules are different
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UDate m = getTimeInMillis(status);
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civil = beCivil;
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clear();
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setTimeInMillis(m, status);
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}
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}
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/**
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* Returns <code>true</code> if this object is using the fixed-cycle civil
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* calendar, or <code>false</code> if using the religious, astronomical
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* calendar.
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* @draft ICU 2.4
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*/
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UBool IslamicCalendar::isCivil() {
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return (civil == CIVIL);
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}
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//-------------------------------------------------------------------------
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// Minimum / Maximum access functions
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//-------------------------------------------------------------------------
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static const int32_t LIMITS[UCAL_FIELD_COUNT][4] = {
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// Minimum Greatest Least Maximum
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// Minimum Maximum
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{ 0, 0, 0, 0 }, // ERA
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{ 1, 1, 5000000, 5000000 }, // YEAR
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{ 0, 0, 11, 11 }, // MONTH
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{ 1, 1, 51, 52 }, // WEEK_OF_YEAR
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{ 0, 0, 5, 6 }, // WEEK_OF_MONTH
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{ 1, 1, 29, 30 }, // DAY_OF_MONTH
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{ 1, 1, 354, 355 }, // DAY_OF_YEAR
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{/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // DAY_OF_WEEK
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{ -1, -1, 4, 5 }, // DAY_OF_WEEK_IN_MONTH
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{/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // AM_PM
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{/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // HOUR
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{/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // HOUR_OF_DAY
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{/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // MINUTE
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{/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // SECOND
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{/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // MILLISECOND
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{/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // ZONE_OFFSET
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{/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // DST_OFFSET
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{ 1, 1, 5000001, 5000001 }, // YEAR_WOY
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{/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // DOW_LOCAL
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{ 1, 1, 5000000, 5000000 }, // EXTENDED_YEAR
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{/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // JULIAN_DAY
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{/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1} // MILLISECONDS_IN_DAY
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};
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/**
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* @draft ICU 2.4
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*/
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int32_t IslamicCalendar::handleGetLimit(UCalendarDateFields field, ELimitType limitType) const {
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return LIMITS[field][limitType];
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}
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//-------------------------------------------------------------------------
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// Assorted calculation utilities
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//
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/**
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* Determine whether a year is a leap year in the Islamic civil calendar
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*/
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UBool IslamicCalendar::civilLeapYear(int32_t year)
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{
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return (14 + 11 * year) % 30 < 11;
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}
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/**
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* Return the day # on which the given year starts. Days are counted
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* from the Hijri epoch, origin 0.
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*/
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int32_t IslamicCalendar::yearStart(int32_t year) {
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if (civil == CIVIL) {
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return (year-1)*354 + Math::floorDivide((3+11*year),30);
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} else {
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return trueMonthStart(12*(year-1));
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}
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}
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/**
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* Return the day # on which the given month starts. Days are counted
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* from the Hijri epoch, origin 0.
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*
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* @param year The hijri year
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* @param year The hijri month, 0-based
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*/
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int32_t IslamicCalendar::monthStart(int32_t year, int32_t month) const {
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if (civil == CIVIL) {
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return (int32_t)uprv_ceil(29.5*month)
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+ (year-1)*354 + (int32_t)Math::floorDivide((3+11*year),30);
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} else {
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return trueMonthStart(12*(year-1) + month);
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}
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}
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/**
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* Find the day number on which a particular month of the true/lunar
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* Islamic calendar starts.
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*
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* @param month The month in question, origin 0 from the Hijri epoch
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*
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* @return The day number on which the given month starts.
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*/
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int32_t IslamicCalendar::trueMonthStart(int32_t month) const
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{
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UErrorCode status = U_ZERO_ERROR;
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int32_t start = CalendarCache::get(&gMonthCache, month, status);
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if (start==0) {
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// Make a guess at when the month started, using the average length
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UDate origin = HIJRA_MILLIS
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+ uprv_floor(month * CalendarAstronomer::SYNODIC_MONTH - 1) * kOneDay;
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double age = moonAge(origin);
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if (moonAge(origin) >= 0) {
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// The month has already started
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do {
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origin -= kOneDay;
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age = moonAge(origin);
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} while (age >= 0);
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}
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else {
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// Preceding month has not ended yet.
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do {
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origin += kOneDay;
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age = moonAge(origin);
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} while (age < 0);
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}
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start = (int32_t)Math::floorDivide((origin - HIJRA_MILLIS), (double)kOneDay) + 1;
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CalendarCache::put(&gMonthCache, month, start, status);
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}
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if(U_FAILURE(status)) {
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start = 0;
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}
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return start;
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}
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/**
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* Return the "age" of the moon at the given time; this is the difference
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* in ecliptic latitude between the moon and the sun. This method simply
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* calls CalendarAstronomer.moonAge, converts to degrees,
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* and adjusts the result to be in the range [-180, 180].
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*
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* @param time The time at which the moon's age is desired,
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* in millis since 1/1/1970.
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*/
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double IslamicCalendar::moonAge(UDate time)
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{
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double age = 0;
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umtx_lock(&astroLock);
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if(gIslamicCalendarAstro == NULL) {
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gIslamicCalendarAstro = new CalendarAstronomer();
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}
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gIslamicCalendarAstro->setTime(time);
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age = gIslamicCalendarAstro->getMoonAge();
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ucln_i18n_registerCleanup(UCLN_I18N_ISLAMIC_CALENDAR, calendar_islamic_cleanup);
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umtx_unlock(&astroLock);
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// Convert to degrees and normalize...
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age = age * 180 / CalendarAstronomer::PI;
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if (age > 180) {
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age = age - 360;
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}
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return age;
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}
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//----------------------------------------------------------------------
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// Calendar framework
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//----------------------------------------------------------------------
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/**
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* Return the length (in days) of the given month.
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*
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* @param year The hijri year
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* @param year The hijri month, 0-based
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* @draft ICU 2.4
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*/
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int32_t IslamicCalendar::handleGetMonthLength(int32_t extendedYear, int32_t month) const {
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int32_t length = 0;
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if (civil == CIVIL) {
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length = 29 + (month+1) % 2;
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if (month == DHU_AL_HIJJAH && civilLeapYear(extendedYear)) {
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length++;
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}
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} else {
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month = 12*(extendedYear-1) + month;
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length = trueMonthStart(month+1) - trueMonthStart(month) ;
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}
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return length;
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}
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/**
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* Return the number of days in the given Islamic year
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* @draft ICU 2.4
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*/
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int32_t IslamicCalendar::handleGetYearLength(int32_t extendedYear) const {
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if (civil == CIVIL) {
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return 354 + (civilLeapYear(extendedYear) ? 1 : 0);
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} else {
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int32_t month = 12*(extendedYear-1);
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return (trueMonthStart(month + 12) - trueMonthStart(month));
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}
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}
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//-------------------------------------------------------------------------
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// Functions for converting from field values to milliseconds....
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//-------------------------------------------------------------------------
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// Return JD of start of given month/year
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/**
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* @draft ICU 2.4
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*/
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int32_t IslamicCalendar::handleComputeMonthStart(int32_t eyear, int32_t month, UBool /* useMonth */) const {
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return monthStart(eyear, month) + 1948439;
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}
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//-------------------------------------------------------------------------
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// Functions for converting from milliseconds to field values
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//-------------------------------------------------------------------------
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/**
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* @draft ICU 2.4
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*/
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int32_t IslamicCalendar::handleGetExtendedYear() {
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int32_t year;
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if (newerField(UCAL_EXTENDED_YEAR, UCAL_YEAR) == UCAL_EXTENDED_YEAR) {
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year = internalGet(UCAL_EXTENDED_YEAR, 1); // Default to year 1
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} else {
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year = internalGet(UCAL_YEAR, 1); // Default to year 1
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}
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return year;
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}
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/**
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* Override Calendar to compute several fields specific to the Islamic
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* calendar system. These are:
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*
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* <ul><li>ERA
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* <li>YEAR
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* <li>MONTH
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* <li>DAY_OF_MONTH
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* <li>DAY_OF_YEAR
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* <li>EXTENDED_YEAR</ul>
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*
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* The DAY_OF_WEEK and DOW_LOCAL fields are already set when this
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* method is called. The getGregorianXxx() methods return Gregorian
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* calendar equivalents for the given Julian day.
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* @draft ICU 2.4
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*/
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void IslamicCalendar::handleComputeFields(int32_t julianDay, UErrorCode &/*status*/) {
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int32_t year, month, dayOfMonth, dayOfYear;
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UDate startDate;
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int32_t days = julianDay - 1948440;
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if (civil == CIVIL) {
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// Use the civil calendar approximation, which is just arithmetic
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year = (int)Math::floorDivide( (double)(30 * days + 10646) , 10631.0 );
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month = (int32_t)uprv_ceil((days - 29 - yearStart(year)) / 29.5 );
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month = month<11?month:11;
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startDate = monthStart(year, month);
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} else {
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// Guess at the number of elapsed full months since the epoch
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int32_t months = (int32_t)uprv_floor((double)days / CalendarAstronomer::SYNODIC_MONTH);
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startDate = uprv_floor(months * CalendarAstronomer::SYNODIC_MONTH - 1);
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if ( days - startDate >= 28 && moonAge(internalGetTime()) > 0) {
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// If we're near the end of the month, assume next month and search backwards
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months++;
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}
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// Find out the last time that the new moon was actually visible at this longitude
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// This returns midnight the night that the moon was visible at sunset.
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while ((startDate = trueMonthStart(months)) > days) {
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// If it was after the date in question, back up a month and try again
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months--;
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}
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year = months / 12 + 1;
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month = months % 12;
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}
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dayOfMonth = (days - monthStart(year, month)) + 1;
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// Now figure out the day of the year.
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dayOfYear = (days - monthStart(year, 0) + 1);
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internalSet(UCAL_ERA, 0);
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internalSet(UCAL_YEAR, year);
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internalSet(UCAL_EXTENDED_YEAR, year);
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internalSet(UCAL_MONTH, month);
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internalSet(UCAL_DAY_OF_MONTH, dayOfMonth);
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internalSet(UCAL_DAY_OF_YEAR, dayOfYear);
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}
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UBool
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IslamicCalendar::inDaylightTime(UErrorCode& status) const
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{
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// copied from GregorianCalendar
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if (U_FAILURE(status) || !getTimeZone().useDaylightTime())
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return FALSE;
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// Force an update of the state of the Calendar.
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((IslamicCalendar*)this)->complete(status); // cast away const
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return (UBool)(U_SUCCESS(status) ? (internalGet(UCAL_DST_OFFSET) != 0) : FALSE);
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}
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// default century
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const UDate IslamicCalendar::fgSystemDefaultCentury = DBL_MIN;
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const int32_t IslamicCalendar::fgSystemDefaultCenturyYear = -1;
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UDate IslamicCalendar::fgSystemDefaultCenturyStart = DBL_MIN;
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int32_t IslamicCalendar::fgSystemDefaultCenturyStartYear = -1;
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UBool IslamicCalendar::haveDefaultCentury() const
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{
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return TRUE;
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}
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UDate IslamicCalendar::defaultCenturyStart() const
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{
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return internalGetDefaultCenturyStart();
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}
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int32_t IslamicCalendar::defaultCenturyStartYear() const
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{
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return internalGetDefaultCenturyStartYear();
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}
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UDate
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IslamicCalendar::internalGetDefaultCenturyStart() const
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{
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// lazy-evaluate systemDefaultCenturyStart
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UBool needsUpdate;
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UMTX_CHECK(NULL, (fgSystemDefaultCenturyStart == fgSystemDefaultCentury), needsUpdate);
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if (needsUpdate) {
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initializeSystemDefaultCentury();
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}
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// use defaultCenturyStart unless it's the flag value;
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// then use systemDefaultCenturyStart
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return fgSystemDefaultCenturyStart;
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}
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int32_t
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IslamicCalendar::internalGetDefaultCenturyStartYear() const
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{
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// lazy-evaluate systemDefaultCenturyStartYear
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UBool needsUpdate;
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UMTX_CHECK(NULL, (fgSystemDefaultCenturyStart == fgSystemDefaultCentury), needsUpdate);
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if (needsUpdate) {
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initializeSystemDefaultCentury();
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}
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// use defaultCenturyStart unless it's the flag value;
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// then use systemDefaultCenturyStartYear
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return fgSystemDefaultCenturyStartYear;
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}
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void
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IslamicCalendar::initializeSystemDefaultCentury()
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{
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// initialize systemDefaultCentury and systemDefaultCenturyYear based
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// on the current time. They'll be set to 80 years before
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// the current time.
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// No point in locking as it should be idempotent.
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if (fgSystemDefaultCenturyStart == fgSystemDefaultCentury)
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{
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UErrorCode status = U_ZERO_ERROR;
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IslamicCalendar calendar(Locale("@calendar=islamic-civil"),status);
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if (U_SUCCESS(status))
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{
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calendar.setTime(Calendar::getNow(), status);
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calendar.add(UCAL_YEAR, -80, status);
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UDate newStart = calendar.getTime(status);
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int32_t newYear = calendar.get(UCAL_YEAR, status);
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{
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umtx_lock(NULL);
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fgSystemDefaultCenturyStart = newStart;
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fgSystemDefaultCenturyStartYear = newYear;
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|
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
|
|
|