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// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
/*
******************************************************************************
* Copyright (C) 2013, International Business Machines Corporation
* and others. All Rights Reserved.
******************************************************************************
*
* File DANGICAL.CPP
*****************************************************************************
*/
#include "chnsecal.h"
#include "dangical.h"
#if !UCONFIG_NO_FORMATTING
#include "gregoimp.h" // Math
#include "uassert.h"
#include "ucln_in.h"
#include "umutex.h"
#include "unicode/rbtz.h"
#include "unicode/tzrule.h"
// --- The cache --
static icu::TimeZone *gDangiCalendarZoneAstroCalc = NULL;
static icu::UInitOnce gDangiCalendarInitOnce = U_INITONCE_INITIALIZER;
/**
* The start year of the Korean traditional calendar (Dan-gi) is the inaugural
* year of Dan-gun (BC 2333).
*/
static const int32_t DANGI_EPOCH_YEAR = -2332; // Gregorian year
U_CDECL_BEGIN
static UBool calendar_dangi_cleanup(void) {
if (gDangiCalendarZoneAstroCalc) {
delete gDangiCalendarZoneAstroCalc;
gDangiCalendarZoneAstroCalc = NULL;
}
gDangiCalendarInitOnce.reset();
return TRUE;
}
U_CDECL_END
U_NAMESPACE_BEGIN
// Implementation of the DangiCalendar class
//-------------------------------------------------------------------------
// Constructors...
//-------------------------------------------------------------------------
DangiCalendar::DangiCalendar(const Locale& aLocale, UErrorCode& success)
: ChineseCalendar(aLocale, DANGI_EPOCH_YEAR, getDangiCalZoneAstroCalc(), success)
{
}
DangiCalendar::DangiCalendar (const DangiCalendar& other)
: ChineseCalendar(other)
{
}
DangiCalendar::~DangiCalendar()
{
}
DangiCalendar*
DangiCalendar::clone() const
{
return new DangiCalendar(*this);
}
const char *DangiCalendar::getType() const {
return "dangi";
}
/**
* The time zone used for performing astronomical computations for
* Dangi calendar. In Korea various timezones have been used historically
* (cf. http://www.math.snu.ac.kr/~kye/others/lunar.html):
*
* - 1908/04/01: GMT+8
* 1908/04/01 - 1911/12/31: GMT+8.5
* 1912/01/01 - 1954/03/20: GMT+9
* 1954/03/21 - 1961/08/09: GMT+8.5
* 1961/08/10 - : GMT+9
*
* Note that, in 1908-1911, the government did not apply the timezone change
* but used GMT+8. In addition, 1954-1961's timezone change does not affect
* the lunar date calculation. Therefore, the following simpler rule works:
*
* -1911: GMT+8
* 1912-: GMT+9
*
* Unfortunately, our astronomer's approximation doesn't agree with the
* references (http://www.math.snu.ac.kr/~kye/others/lunar.html and
* http://astro.kasi.re.kr/Life/ConvertSolarLunarForm.aspx?MenuID=115)
* in 1897/7/30. So the following ad hoc fix is used here:
*
* -1896: GMT+8
* 1897: GMT+7
* 1898-1911: GMT+8
* 1912- : GMT+9
*/
static void U_CALLCONV initDangiCalZoneAstroCalc(void) {
U_ASSERT(gDangiCalendarZoneAstroCalc == NULL);
const UDate millis1897[] = { (UDate)((1897 - 1970) * 365 * kOneDay) }; // some days of error is not a problem here
const UDate millis1898[] = { (UDate)((1898 - 1970) * 365 * kOneDay) }; // some days of error is not a problem here
const UDate millis1912[] = { (UDate)((1912 - 1970) * 365 * kOneDay) }; // this doesn't create an issue for 1911/12/20
InitialTimeZoneRule* initialTimeZone = new InitialTimeZoneRule(UNICODE_STRING_SIMPLE("GMT+8"), 8*kOneHour, 0);
TimeZoneRule* rule1897 = new TimeArrayTimeZoneRule(UNICODE_STRING_SIMPLE("Korean 1897"), 7*kOneHour, 0, millis1897, 1, DateTimeRule::STANDARD_TIME);
TimeZoneRule* rule1898to1911 = new TimeArrayTimeZoneRule(UNICODE_STRING_SIMPLE("Korean 1898-1911"), 8*kOneHour, 0, millis1898, 1, DateTimeRule::STANDARD_TIME);
TimeZoneRule* ruleFrom1912 = new TimeArrayTimeZoneRule(UNICODE_STRING_SIMPLE("Korean 1912-"), 9*kOneHour, 0, millis1912, 1, DateTimeRule::STANDARD_TIME);
UErrorCode status = U_ZERO_ERROR;
RuleBasedTimeZone* dangiCalZoneAstroCalc = new RuleBasedTimeZone(UNICODE_STRING_SIMPLE("KOREA_ZONE"), initialTimeZone); // adopts initialTimeZone
dangiCalZoneAstroCalc->addTransitionRule(rule1897, status); // adopts rule1897
dangiCalZoneAstroCalc->addTransitionRule(rule1898to1911, status);
dangiCalZoneAstroCalc->addTransitionRule(ruleFrom1912, status);
dangiCalZoneAstroCalc->complete(status);
if (U_SUCCESS(status)) {
gDangiCalendarZoneAstroCalc = dangiCalZoneAstroCalc;
} else {
delete dangiCalZoneAstroCalc;
gDangiCalendarZoneAstroCalc = NULL;
}
ucln_i18n_registerCleanup(UCLN_I18N_DANGI_CALENDAR, calendar_dangi_cleanup);
}
const TimeZone* DangiCalendar::getDangiCalZoneAstroCalc(void) const {
umtx_initOnce(gDangiCalendarInitOnce, &initDangiCalZoneAstroCalc);
return gDangiCalendarZoneAstroCalc;
}
UOBJECT_DEFINE_RTTI_IMPLEMENTATION(DangiCalendar)
U_NAMESPACE_END
#endif
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