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