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