+// © 2016 and later: Unicode, Inc. and others.
+// License & terms of use: http://www.unicode.org/copyright.html
/*
******************************************************************************
- * Copyright (C) 2007-2011, International Business Machines Corporation
+ * Copyright (C) 2007-2014, International Business Machines Corporation
* and others. All Rights Reserved.
******************************************************************************
*
#include <float.h>
#include "gregoimp.h" // Math
#include "astro.h" // CalendarAstronomer
+#include "unicode/simpletz.h"
#include "uhash.h"
#include "ucln_in.h"
// --- The cache --
-static UMTX astroLock = 0; // pod bay door lock
+static icu::UMutex *astroLock() { // Protects access to gChineseCalendarAstro.
+ static icu::UMutex *m = STATIC_NEW(icu::UMutex);
+ return m;
+}
static icu::CalendarAstronomer *gChineseCalendarAstro = NULL;
+
+// Lazy Creation & Access synchronized by class CalendarCache with a mutex.
static icu::CalendarCache *gChineseCalendarWinterSolsticeCache = NULL;
static icu::CalendarCache *gChineseCalendarNewYearCache = NULL;
+static icu::TimeZone *gChineseCalendarZoneAstroCalc = NULL;
+static icu::UInitOnce gChineseCalendarZoneAstroCalcInitOnce = U_INITONCE_INITIALIZER;
+
/**
* The start year of the Chinese calendar, the 61st year of the reign
* of Huang Di. Some sources use the first year of his reign,
* computations. Some sources use a different historically accurate
* offset of GMT+7:45:40 for years before 1929; we do not do this.
*/
-static const double CHINA_OFFSET = 8 * kOneHour;
+static const int32_t CHINA_OFFSET = 8 * kOneHour;
/**
* Value to be added or subtracted from the local days of a new moon to
delete gChineseCalendarNewYearCache;
gChineseCalendarNewYearCache = NULL;
}
- umtx_destroy(&astroLock);
+ if (gChineseCalendarZoneAstroCalc) {
+ delete gChineseCalendarZoneAstroCalc;
+ gChineseCalendarZoneAstroCalc = NULL;
+ }
+ gChineseCalendarZoneAstroCalcInitOnce.reset();
return TRUE;
}
U_CDECL_END
}
ChineseCalendar::ChineseCalendar(const Locale& aLocale, UErrorCode& success)
-: Calendar(TimeZone::createDefault(), aLocale, success)
+: Calendar(TimeZone::createDefault(), aLocale, success),
+ isLeapYear(FALSE),
+ fEpochYear(CHINESE_EPOCH_YEAR),
+ fZoneAstroCalc(getChineseCalZoneAstroCalc())
+{
+ setTimeInMillis(getNow(), success); // Call this again now that the vtable is set up properly.
+}
+
+ChineseCalendar::ChineseCalendar(const Locale& aLocale, int32_t epochYear,
+ const TimeZone* zoneAstroCalc, UErrorCode &success)
+: Calendar(TimeZone::createDefault(), aLocale, success),
+ isLeapYear(FALSE),
+ fEpochYear(epochYear),
+ fZoneAstroCalc(zoneAstroCalc)
{
- isLeapYear = FALSE;
setTimeInMillis(getNow(), success); // Call this again now that the vtable is set up properly.
}
ChineseCalendar::ChineseCalendar(const ChineseCalendar& other) : Calendar(other) {
isLeapYear = other.isLeapYear;
+ fEpochYear = other.fEpochYear;
+ fZoneAstroCalc = other.fZoneAstroCalc;
}
ChineseCalendar::~ChineseCalendar()
return "chinese";
}
+static void U_CALLCONV initChineseCalZoneAstroCalc() {
+ gChineseCalendarZoneAstroCalc = new SimpleTimeZone(CHINA_OFFSET, UNICODE_STRING_SIMPLE("CHINA_ZONE") );
+ ucln_i18n_registerCleanup(UCLN_I18N_CHINESE_CALENDAR, calendar_chinese_cleanup);
+}
+
+const TimeZone* ChineseCalendar::getChineseCalZoneAstroCalc(void) const {
+ umtx_initOnce(gChineseCalendarZoneAstroCalcInitOnce, &initChineseCalZoneAstroCalc);
+ return gChineseCalendarZoneAstroCalc;
+}
+
//-------------------------------------------------------------------------
// Minimum / Maximum access functions
//-------------------------------------------------------------------------
year = internalGet(UCAL_EXTENDED_YEAR, 1); // Default to year 1
} else {
int32_t cycle = internalGet(UCAL_ERA, 1) - 1; // 0-based cycle
- year = cycle * 60 + internalGet(UCAL_YEAR, 1);
+ // adjust to the instance specific epoch
+ year = cycle * 60 + internalGet(UCAL_YEAR, 1) - (fEpochYear - CHINESE_EPOCH_YEAR);
}
return year;
}
month = (int32_t)m;
}
- int32_t gyear = eyear + CHINESE_EPOCH_YEAR - 1; // Gregorian year
+ int32_t gyear = eyear + fEpochYear - 1; // Gregorian year
int32_t theNewYear = newYear(gyear);
int32_t newMoon = newMoonNear(theNewYear + month * 29, TRUE);
/**
* Convert local days to UTC epoch milliseconds.
- * @param days days after January 1, 1970 0:00 Asia/Shanghai
+ * This is not an accurate conversion in that getTimezoneOffset
+ * takes the milliseconds in GMT (not local time). In theory, more
+ * accurate algorithm can be implemented but practically we do not need
+ * to go through that complication as long as the historical timezone
+ * changes did not happen around the 'tricky' new moon (new moon around
+ * midnight).
+ *
+ * @param days days after January 1, 1970 0:00 in the astronomical base zone
* @return milliseconds after January 1, 1970 0:00 GMT
*/
-double ChineseCalendar::daysToMillis(double days) {
- return (days * kOneDay) - CHINA_OFFSET;
+double ChineseCalendar::daysToMillis(double days) const {
+ double millis = days * (double)kOneDay;
+ if (fZoneAstroCalc != NULL) {
+ int32_t rawOffset, dstOffset;
+ UErrorCode status = U_ZERO_ERROR;
+ fZoneAstroCalc->getOffset(millis, FALSE, rawOffset, dstOffset, status);
+ if (U_SUCCESS(status)) {
+ return millis - (double)(rawOffset + dstOffset);
+ }
+ }
+ return millis - (double)CHINA_OFFSET;
}
/**
* Convert UTC epoch milliseconds to local days.
* @param millis milliseconds after January 1, 1970 0:00 GMT
- * @return days after January 1, 1970 0:00 Asia/Shanghai
+ * @return days after January 1, 1970 0:00 in the astronomical base zone
*/
-double ChineseCalendar::millisToDays(double millis) {
- return ClockMath::floorDivide(millis + CHINA_OFFSET, kOneDay);
+double ChineseCalendar::millisToDays(double millis) const {
+ if (fZoneAstroCalc != NULL) {
+ int32_t rawOffset, dstOffset;
+ UErrorCode status = U_ZERO_ERROR;
+ fZoneAstroCalc->getOffset(millis, FALSE, rawOffset, dstOffset, status);
+ if (U_SUCCESS(status)) {
+ return ClockMath::floorDivide(millis + (double)(rawOffset + dstOffset), kOneDay);
+ }
+ }
+ return ClockMath::floorDivide(millis + (double)CHINA_OFFSET, kOneDay);
}
//------------------------------------------------------------------
// Astronomical computations
//------------------------------------------------------------------
+// bit array for gregorian 1900-2100 indicating years in
+// which the linear estimate needs to be adjusted by -1
+static const uint16_t winterSolsticeAdj[] = {
+ 0x0001, // 1900-1915, deltas for 1900
+ 0x0444, // 1916-1931, deltas for 1918, 1922, 1926
+ 0x0000, // 1932-1947
+ 0x8880, // 1948-1963, deltas for 1955, 1959, 1963
+ 0x0000, // 1964-1979
+ 0x1100, // 1980-1995, deltas for 1988, 1992
+ 0x0011, // 1996-2011, deltas for 1996, 2000
+ 0x2200, // 2012-2027, deltas for 2021, 2025
+ 0x0022, // 2028-2043, deltas for 2029, 2033
+ 0x4000, // 2044-2059, deltas for 2058
+ 0x0444, // 2060-2075, deltas for 2062, 2066, 2070
+ 0x8000, // 2076-2091, deltas for 2091
+ 0x0088, // 2092-2100, deltas for 2095, 2099
+};
/**
* Return the major solar term on or after December 15 of the given
* winter solstice of the given year
*/
int32_t ChineseCalendar::winterSolstice(int32_t gyear) const {
+ if (gyear >= 1900 && gyear <= 2100) {
+ // Don't use cache, just return linear estimate + table correction
+ int32_t gyearadj = gyear - 1900;
+ int32_t result = (int32_t)(365.243*((double)gyearadj) - 0.3) - 25211;
+ uint16_t bitmap = winterSolsticeAdj[gyearadj / 16];
+ if (bitmap != 0) {
+ uint16_t bitmask = 1 << (gyearadj % 16);
+ if ((bitmask & bitmap) != 0) {
+ result--;
+ }
+ }
+ return result;
+ }
UErrorCode status = U_ZERO_ERROR;
int32_t cacheValue = CalendarCache::get(&gChineseCalendarWinterSolsticeCache, gyear, status);
// PST 1298 with a final result of Dec 14 10:31:59 PST 1299.
double ms = daysToMillis(Grego::fieldsToDay(gyear, UCAL_DECEMBER, 1));
- umtx_lock(&astroLock);
+ umtx_lock(astroLock());
if(gChineseCalendarAstro == NULL) {
gChineseCalendarAstro = new CalendarAstronomer();
ucln_i18n_registerCleanup(UCLN_I18N_CHINESE_CALENDAR, calendar_chinese_cleanup);
}
gChineseCalendarAstro->setTime(ms);
UDate solarLong = gChineseCalendarAstro->getSunTime(CalendarAstronomer::WINTER_SOLSTICE(), TRUE);
- umtx_unlock(&astroLock);
+ umtx_unlock(astroLock());
// Winter solstice is 270 degrees solar longitude aka Dongzhi
cacheValue = (int32_t)millisToDays(solarLong);
* new moon after or before <code>days</code>
*/
int32_t ChineseCalendar::newMoonNear(double days, UBool after) const {
-
- umtx_lock(&astroLock);
- if(gChineseCalendarAstro == NULL) {
- gChineseCalendarAstro = new CalendarAstronomer();
- ucln_i18n_registerCleanup(UCLN_I18N_CHINESE_CALENDAR, calendar_chinese_cleanup);
+ double ms = daysToMillis(days);
+ // Try to get the new moon via static function directly from the table in
+ // CalendarAstronomer (for approx gregorian range 1900-2100) without having
+ // to use a CalendarAstronomer instance which requires a lock. This still
+ // involves extra conversion to/from millis. If static function returns 0
+ // we are out of its range and need to use the full machinery.
+ UDate newMoon = CalendarAstronomer::getNewMoonTimeInRange(ms, after);
+ if (newMoon == 0.0) {
+ umtx_lock(astroLock());
+ if(gChineseCalendarAstro == NULL) {
+ gChineseCalendarAstro = new CalendarAstronomer();
+ ucln_i18n_registerCleanup(UCLN_I18N_CHINESE_CALENDAR, calendar_chinese_cleanup);
+ }
+ gChineseCalendarAstro->setTime(ms);
+ newMoon = gChineseCalendarAstro->getMoonTime(CalendarAstronomer::NEW_MOON(), after);
+ umtx_unlock(astroLock());
}
- gChineseCalendarAstro->setTime(daysToMillis(days));
- UDate newMoon = gChineseCalendarAstro->getMoonTime(CalendarAstronomer::NEW_MOON(), after);
- umtx_unlock(&astroLock);
-
+
return (int32_t) millisToDays(newMoon);
}
*/
int32_t ChineseCalendar::majorSolarTerm(int32_t days) const {
- umtx_lock(&astroLock);
- if(gChineseCalendarAstro == NULL) {
- gChineseCalendarAstro = new CalendarAstronomer();
- ucln_i18n_registerCleanup(UCLN_I18N_CHINESE_CALENDAR, calendar_chinese_cleanup);
- }
- gChineseCalendarAstro->setTime(daysToMillis(days));
- UDate solarLongitude = gChineseCalendarAstro->getSunLongitude();
- umtx_unlock(&astroLock);
+ double ms = daysToMillis(days);
+ UDate solarLongitude = CalendarAstronomer::getSunLongitudeForTime(ms);
+
+ // There was almost never any benefit to using the CalendarAstronomer instance;
+ // it could cache intermediate results, but we rarely used it multiple times in
+ // succession for the same setTime value, so the intermediate results got
+ // discarded anyway.
+ //
+ // Deleted call to gChineseCalendarAstro->getSunLongitude() now that
+ // we use CalendarAstronomer::getSunLongitudeForTime()
// Compute (floor(solarLongitude / (pi/6)) + 2) % 12
int32_t term = ( ((int32_t)(6 * solarLongitude / CalendarAstronomer::PI)) + 2 ) % 12;
/**
* Return true if there is a leap month on or after month newMoon1 and
* at or before month newMoon2.
- * @param newMoon1 days after January 1, 1970 0:00 Asia/Shanghai of a
- * new moon
- * @param newMoon2 days after January 1, 1970 0:00 Asia/Shanghai of a
- * new moon
+ * @param newMoon1 days after January 1, 1970 0:00 astronomical base zone
+ * of a new moon
+ * @param newMoon2 days after January 1, 1970 0:00 astronomical base zone
+ * of a new moon
*/
UBool ChineseCalendar::isLeapMonthBetween(int32_t newMoon1, int32_t newMoon2) const {
* <code>handleComputeMonthStart()</code>.
*
* <p>As a side effect, this method sets {@link #isLeapYear}.
- * @param days days after January 1, 1970 0:00 Asia/Shanghai of the
- * date to compute fields for
+ * @param days days after January 1, 1970 0:00 astronomical base zone
+ * of the date to compute fields for
* @param gyear the Gregorian year of the given date
* @param gmonth the Gregorian month of the given date
* @param setAllFields if true, set the EXTENDED_YEAR, ERA, YEAR,
if (setAllFields) {
- int32_t year = gyear - CHINESE_EPOCH_YEAR;
+ // Extended year and cycle year is based on the epoch year
+
+ int32_t extended_year = gyear - fEpochYear;
+ int cycle_year = gyear - CHINESE_EPOCH_YEAR;
if (month < 11 ||
gmonth >= UCAL_JULY) {
- year++;
+ extended_year++;
+ cycle_year++;
}
int32_t dayOfMonth = days - thisMoon + 1;
- internalSet(UCAL_EXTENDED_YEAR, year);
+ internalSet(UCAL_EXTENDED_YEAR, extended_year);
// 0->0,60 1->1,1 60->1,60 61->2,1 etc.
int32_t yearOfCycle;
- int32_t cycle = ClockMath::floorDivide(year - 1, 60, yearOfCycle);
+ int32_t cycle = ClockMath::floorDivide(cycle_year - 1, 60, yearOfCycle);
internalSet(UCAL_ERA, cycle + 1);
internalSet(UCAL_YEAR, yearOfCycle + 1);
// Fields to time
//------------------------------------------------------------------
+// for gyear 1900 through 2100, corrections to linear estimate of newYear
+static const int8_t newYearAdj[] = {
+ -5, 14, 3, -7, 11, -1, -11, 8, -3, -14, 5, -6, 13, 1, -10, 9, -1, -13, 6, -4, // 1900-1919
+ 15, 3, -8, 11, 0, -12, 8, -3, -13, 5, -6, 12, 1, -10, 9, -1, -12, 6, -5, 14, // 1920-1939
+ 3, -9, 10, 0, -11, 9, -3, -14, 5, -6, 12, 1, -9, 10, -2, -12, 7, -4, 13, 3, // 1940-1959
+ -8, 11, 0, -11, 8, -2, -15, 4, -6, 13, 1, -9, 10, -1, -13, 6, -5, 14, 2, -8, // 1960-1979
+ 11, 1, -11, 8, -3, 16, 5, -7, 12, 2, -8, 10, -1, -12, 6, -5, 14, 3, -7, 11, // 1980-1999
+ 0, -11, 8, -4, -14, 5, -6, 13, 2, -9, 10, -2, -13, 6, -4, 14, 3, -7, 12, 0, // 2000-2019
+ -11, 8, -3, -14, 5, -6, 13, 2, -10, 9, -1, -12, 6, -4, 15, 4, -8, 11, 0, -11, // 2020-2039
+ 7, -3, -13, 6, -6, 13, 2, -9, 9, -2, -12, 7, -4, 15, 4, -7, 10, 0, -11, 8, // 2040-2059
+ -3, -14, 5, -6, 12, 1, -9, 10, -1, -12, 7, -4, 15, 3, -8, 11, 1, -11, 8, -2, // 2060-2079
+ -13, 5, -6, 13, 2, -9, 10, -1, -11, 6, -5, 14, 3, -8, 11, 1, -10, 8, -3, -14, // 2080-2099
+ 5 // 2100
+};
+
/**
* Return the Chinese new year of the given Gregorian year.
* @param gyear a Gregorian year
- * @return days after January 1, 1970 0:00 Asia/Shanghai of the
+ * @return days after January 1, 1970 0:00 astronomical base zone of the
* Chinese new year of the given year (this will be a new moon)
*/
int32_t ChineseCalendar::newYear(int32_t gyear) const {
+ if (gyear >= 1900 && gyear <= 2100) {
+ // Don't use cache, just return linear estimate + table correction
+ int32_t gyearadj = gyear - 1900;
+ return (int32_t)(365.244*((double)gyearadj)) - 25532 + newYearAdj[gyearadj];
+ }
+
UErrorCode status = U_ZERO_ERROR;
int32_t cacheValue = CalendarCache::get(&gChineseCalendarNewYearCache, gyear, status);
}
// default century
-const UDate ChineseCalendar::fgSystemDefaultCentury = DBL_MIN;
-const int32_t ChineseCalendar::fgSystemDefaultCenturyYear = -1;
-UDate ChineseCalendar::fgSystemDefaultCenturyStart = DBL_MIN;
-int32_t ChineseCalendar::fgSystemDefaultCenturyStartYear = -1;
+static UDate gSystemDefaultCenturyStart = DBL_MIN;
+static int32_t gSystemDefaultCenturyStartYear = -1;
+static icu::UInitOnce gSystemDefaultCenturyInitOnce = U_INITONCE_INITIALIZER;
UBool ChineseCalendar::haveDefaultCentury() const
return internalGetDefaultCenturyStartYear();
}
-UDate
-ChineseCalendar::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
-ChineseCalendar::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
-ChineseCalendar::initializeSystemDefaultCentury()
+static void U_CALLCONV 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;
ChineseCalendar calendar(Locale("@calendar=chinese"),status);
- if (U_SUCCESS(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);
- if (fgSystemDefaultCenturyStart == fgSystemDefaultCentury)
- {
- fgSystemDefaultCenturyStartYear = newYear;
- fgSystemDefaultCenturyStart = newStart;
- }
- umtx_unlock(NULL);
+ gSystemDefaultCenturyStart = calendar.getTime(status);
+ gSystemDefaultCenturyStartYear = calendar.get(UCAL_YEAR, status);
}
// We have no recourse upon failure unless we want to propagate the failure
// out.
}
+UDate
+ChineseCalendar::internalGetDefaultCenturyStart() const
+{
+ // lazy-evaluate systemDefaultCenturyStart
+ umtx_initOnce(gSystemDefaultCenturyInitOnce, &initializeSystemDefaultCentury);
+ return gSystemDefaultCenturyStart;
+}
+
+int32_t
+ChineseCalendar::internalGetDefaultCenturyStartYear() const
+{
+ // lazy-evaluate systemDefaultCenturyStartYear
+ umtx_initOnce(gSystemDefaultCenturyInitOnce, &initializeSystemDefaultCentury);
+ return gSystemDefaultCenturyStartYear;
+}
+
UOBJECT_DEFINE_RTTI_IMPLEMENTATION(ChineseCalendar)
U_NAMESPACE_END
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