From da2d29fbc1e9a0477ace61bd22e0572695ea1bce Mon Sep 17 00:00:00 2001 From: Eric Mader Date: Tue, 17 Jul 2007 21:15:22 +0000 Subject: [PATCH] ICU-4082 Initial checkin of Indian Calendar. X-SVN-Rev: 22016 --- icu4c/source/i18n/Makefile.in | 2 +- icu4c/source/i18n/calendar.cpp | 6 +- icu4c/source/i18n/i18n.vcproj | 24 +- icu4c/source/i18n/indiancal.cpp | 445 ++++++++++++++++++++++++++++++++ icu4c/source/i18n/indiancal.h | 371 ++++++++++++++++++++++++++ 5 files changed, 838 insertions(+), 10 deletions(-) create mode 100644 icu4c/source/i18n/indiancal.cpp create mode 100644 icu4c/source/i18n/indiancal.h diff --git a/icu4c/source/i18n/Makefile.in b/icu4c/source/i18n/Makefile.in index ab4e763a45..a2b0c19b90 100644 --- a/icu4c/source/i18n/Makefile.in +++ b/icu4c/source/i18n/Makefile.in @@ -67,7 +67,7 @@ ucurr.o digitlst.o fmtable_cnv.o \ choicfmt.o datefmt.o smpdtfmt.o reldtfmt.o dtfmtsym.o udat.o \ nfrs.o nfrule.o nfsubs.o rbnf.o ucsdet.o \ ucal.o calendar.o gregocal.o timezone.o simpletz.o olsontz.o \ -astro.o taiwncal.o buddhcal.o persncal.o islamcal.o japancal.o gregoimp.o hebrwcal.o \ +astro.o taiwncal.o buddhcal.o persncal.o islamcal.o japancal.o gregoimp.o hebrwcal.o indiancal.o \ coleitr.o coll.o tblcoll.o sortkey.o bocsu.o ucoleitr.o \ ucol.o ucol_res.o ucol_bld.o ucol_sit.o ucol_tok.o ucol_wgt.o ucol_cnt.o ucol_elm.o \ strmatch.o usearch.o search.o stsearch.o \ diff --git a/icu4c/source/i18n/calendar.cpp b/icu4c/source/i18n/calendar.cpp index dadac4abef..6a932f68e6 100644 --- a/icu4c/source/i18n/calendar.cpp +++ b/icu4c/source/i18n/calendar.cpp @@ -1,6 +1,6 @@ /* ******************************************************************************* -* Copyright (C) 1997-2006, International Business Machines Corporation and * +* Copyright (C) 1997-2007, International Business Machines Corporation and * * others. All Rights Reserved. * ******************************************************************************* * @@ -36,6 +36,7 @@ #include "islamcal.h" #include "hebrwcal.h" #include "persncal.h" +#include "indiancal.h" //#include "chnsecal.h" #include "unicode/calendar.h" #include "cpputils.h" @@ -140,6 +141,7 @@ static const char * const gCalendarKeywords[] = { "islamic", "hebrew", "chinese", + "indian", NULL }; @@ -196,6 +198,8 @@ static Calendar *createStandardCalendar(char *calType, const Locale &canLoc, UEr return new PersianCalendar(canLoc, status); //} else if(!uprv_strcmp(calType, "chinese")) { //return new ChineseCalendar(canLoc, status); + } else if(!uprv_strcmp(calType, "indian")) { + return new IndianCalendar(canLoc, status); } else { status = U_UNSUPPORTED_ERROR; return NULL; diff --git a/icu4c/source/i18n/i18n.vcproj b/icu4c/source/i18n/i18n.vcproj index e1ac44e785..867d29a481 100644 --- a/icu4c/source/i18n/i18n.vcproj +++ b/icu4c/source/i18n/i18n.vcproj @@ -530,14 +530,6 @@ RelativePath=".\unicode\basictz.h" > - - - - @@ -898,6 +890,14 @@ RelativePath=".\hebrwcal.h" > + + + + @@ -1178,6 +1178,14 @@ /> + + + + diff --git a/icu4c/source/i18n/indiancal.cpp b/icu4c/source/i18n/indiancal.cpp new file mode 100644 index 0000000000..ff4dcf3eca --- /dev/null +++ b/icu4c/source/i18n/indiancal.cpp @@ -0,0 +1,445 @@ +/* + * Copyright (C) 2003-2007, International Business Machines Corporation + * and others. All Rights Reserved. + ****************************************************************************** + * + * File INDIANCAL.CPP + ***************************************************************************** + */ + +#include "indiancal.h" +#include +#if !UCONFIG_NO_FORMATTING + +#include "mutex.h" +#include +#include "gregoimp.h" // Math +#include "astro.h" // CalendarAstronomer +#include "uhash.h" +#include "ucln_in.h" + +// Debugging +#ifdef U_DEBUG_INDIANCAL +#include +#include + +#endif + +U_NAMESPACE_BEGIN + +// Implementation of the IndianCalendar class + +//------------------------------------------------------------------------- +// Constructors... +//------------------------------------------------------------------------- + + +Calendar* IndianCalendar::clone() const { + return new IndianCalendar(*this); +} + +IndianCalendar::IndianCalendar(const Locale& aLocale, UErrorCode& success) + : Calendar(TimeZone::createDefault(), aLocale, success) +{ + setTimeInMillis(getNow(), success); // Call this again now that the vtable is set up properly. +} + +IndianCalendar::IndianCalendar(const IndianCalendar& other) : Calendar(other) { +} + +IndianCalendar::~IndianCalendar() +{ +} +const char *IndianCalendar::getType() const { + return "indian"; +} + +static const int32_t LIMITS[UCAL_FIELD_COUNT][4] = { + // Minimum Greatest Least Maximum + // Minimum Maximum + { 0, 0, 0, 0 }, // ERA + { 1, 1, 5000000, 5000000 }, // YEAR + { 0, 0, 11, 11 }, // MONTH + { 1, 1, 52, 53 }, // WEEK_OF_YEAR + { 0, 0, 5, 6 }, // WEEK_OF_MONTH + { 1, 1, 30, 31 }, // DAY_OF_MONTH + { 1, 1, 365, 366 }, // DAY_OF_YEAR + {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // DAY_OF_WEEK + { -1, -1, 4, 6 }, // DAY_OF_WEEK_IN_MONTH + {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // AM_PM + {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // HOUR + {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // HOUR_OF_DAY + {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // MINUTE + {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // SECOND + {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // MILLISECOND + {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // ZONE_OFFSET + {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // DST_OFFSET + { 1, 1, 5000001, 5000001}, // YEAR_WOY + {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // DOW_LOCAL + { 1, 1, 5000000, 5000000}, // EXTENDED_YEAR + {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // JULIAN_DAY + {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1} // MILLISECONDS_IN_DAY +}; + +static const double JULIAN_EPOCH = 1721425.5; +static const int32_t INDIAN_ERA_START = 78; +static const int32_t INDIAN_YEAR_START = 80; + +int32_t IndianCalendar::handleGetLimit(UCalendarDateFields field, ELimitType limitType) const { + return LIMITS[field][limitType]; +} + +/* + * Determine whether the given gregorian year is a Leap year + */ +static UBool isGregorianLeap(int32_t year) +{ + return ((year % 4) == 0) && (!(((year % 100) == 0) && ((year % 400) != 0))); +} + +//---------------------------------------------------------------------- +// Calendar framework +//---------------------------------------------------------------------- + +/* + * Return the length (in days) of the given month. + * + * @param eyear The year in Saka Era + * @param month The month(0-based) in Indian calendar + */ +int32_t IndianCalendar::handleGetMonthLength(int32_t eyear, int32_t month) const { + if (month < 0 || month > 11) { + eyear += Math::floorDivide(month, 12, month); + } + + if (isGregorianLeap(eyear + INDIAN_ERA_START) && month == 0) { + return 31; + } + + if (month >= 1 && month <= 5) { + return 31; + } + + return 30; +} + +/* + * Return the number of days in the given Indian year + * + * @param eyear The year in Saka Era. + */ +int32_t IndianCalendar::handleGetYearLength(int32_t eyear) const { + return isGregorianLeap(eyear + INDIAN_ERA_START) ? 366 : 365; +} +/* + * Returns the Julian Day corresponding to gregorian date + * + * @param year The Gregorian year + * @param month The month in Gregorian Year + * @param date The date in Gregorian day in month + */ +static double gregorianToJD(int32_t year, int32_t month, int32_t date) { + double julianDay = (JULIAN_EPOCH - 1) + + (365 * (year - 1)) + + uprv_floor((year - 1) / 4) + + (-uprv_floor((year - 1) / 100)) + + uprv_floor((year - 1) / 400) + + uprv_floor((((367 * month) - 362) / 12) + + ((month <= 2) ? 0 : + (isGregorianLeap(year) ? -1 : -2) + ) + + date); + + return julianDay; +} + +/* + * Returns the Gregorian Date corresponding to a given Julian Day + * @param jd The Julian Day + */ +static int32_t* jdToGregorian(double jd, int32_t gregorianDate[3]) { + double wjd, depoch, quadricent, dqc, cent, dcent, quad, dquad, yindex, yearday, leapadj; + int32_t year, month, day; + wjd = uprv_floor(jd - 0.5) + 0.5; + depoch = wjd - JULIAN_EPOCH; + quadricent = uprv_floor(depoch / 146097); + dqc = (int32_t)uprv_floor(depoch) % 146097; + cent = uprv_floor(dqc / 36524); + dcent = (int32_t)uprv_floor(dqc) % 36524; + quad = uprv_floor(dcent / 1461); + dquad = (int32_t)uprv_floor(dcent) % 1461; + yindex = uprv_floor(dquad / 365); + year = (int32_t)((quadricent * 400) + (cent * 100) + (quad * 4) + yindex); + if (!((cent == 4) || (yindex == 4))) { + year++; + } + yearday = wjd - gregorianToJD(year, 1, 1); + leapadj = ((wjd < gregorianToJD(year, 3, 1)) ? 0 + : + (isGregorianLeap(year) ? 1 : 2) + ); + month = (int32_t)uprv_floor((((yearday + leapadj) * 12) + 373) / 367); + day = (int32_t)(wjd - gregorianToJD(year, month, 1)) + 1; + + gregorianDate[0] = year; + gregorianDate[1] = month; + gregorianDate[2] = day; + + return gregorianDate; +} + + +//------------------------------------------------------------------------- +// Functions for converting from field values to milliseconds.... +//------------------------------------------------------------------------- +static double IndianToJD(int32_t year, int32_t month, int32_t date) { + int32_t leapMonth, gyear, m; + double start, jd; + + gyear = year + INDIAN_ERA_START; + + + if(isGregorianLeap(gyear)) { + leapMonth = 31; + start = gregorianToJD(gyear, 3, 21); + } + else { + leapMonth = 30; + start = gregorianToJD(gyear, 3, 22); + } + + if (month == 1) { + jd = start + (date - 1); + } else { + jd = start + leapMonth; + m = month - 2; + + //m = Math.min(m, 5); + if (m > 5) { + m = 5; + } + + jd += m * 31; + + if (month >= 8) { + m = month - 7; + jd += m * 30; + } + jd += date - 1; + } + + return jd; +} + +/* + * Return JD of start of given month/year of Indian Calendar + * @param eyear The year in Indian Calendar measured from Saka Era (78 AD). + * @param month The month in Indian calendar + */ +int32_t IndianCalendar::handleComputeMonthStart(int32_t eyear, int32_t month, UBool useMonth) const { + + //month is 0 based; converting it to 1-based + int32_t imonth; + + // If the month is out of range, adjust it into range, and adjust the extended eyar accordingly + if (month < 0 || month > 11) { + eyear += (int32_t)Math::floorDivide(month, 12, month); + } + + if(month == 12){ + imonth = 1; + } else { + imonth = month + 1; + } + + double jd = IndianToJD(eyear ,imonth, 1); + + return (int32_t)jd; +} + +//------------------------------------------------------------------------- +// Functions for converting from milliseconds to field values +//------------------------------------------------------------------------- + +int32_t IndianCalendar::handleGetExtendedYear() { + int32_t year; + + if (newerField(UCAL_EXTENDED_YEAR, UCAL_YEAR) == UCAL_EXTENDED_YEAR) { + year = internalGet(UCAL_EXTENDED_YEAR, 1); // Default to year 1 + } else { + year = internalGet(UCAL_YEAR, 1); // Default to year 1 + } + + return year; +} + +/* + * Override Calendar to compute several fields specific to the Indian + * calendar system. These are: + * + *
  • ERA + *
  • YEAR + *
  • MONTH + *
  • DAY_OF_MONTH + *
  • EXTENDED_YEAR
+ * + * The DAY_OF_WEEK and DOW_LOCAL fields are already set when this + * method is called. The getGregorianXxx() methods return Gregorian + * calendar equivalents for the given Julian day. + */ +void IndianCalendar::handleComputeFields(int32_t julianDay, UErrorCode& status) { + double jdAtStartOfGregYear; + int32_t leapMonth, IndianYear, yday, IndianMonth, IndianDayOfMonth, mday; + int32_t gregorianYear; // Stores gregorian date corresponding to Julian day; + int32_t gd[3]; + + gregorianYear = jdToGregorian(julianDay, gd)[0]; // Gregorian date for Julian day + IndianYear = gregorianYear - INDIAN_ERA_START; // Year in Saka era + jdAtStartOfGregYear = gregorianToJD(gregorianYear, 1, 1); // JD at start of Gregorian year + yday = (int32_t)(julianDay - jdAtStartOfGregYear); // Day number in Gregorian year (starting from 0) + leapMonth = isGregorianLeap(gregorianYear) ? 31 : 30; // Days in leapMonth this year + + if (yday < INDIAN_YEAR_START) { + // Day is at the end of the preceding Saka year + IndianYear -= 1; + yday += leapMonth + (31 * 5) + (30 * 3) + 10 + INDIAN_YEAR_START; + } + + yday -= INDIAN_YEAR_START; + if (yday < leapMonth) { + IndianMonth = 0; + IndianDayOfMonth = yday + 1; + } else { + mday = yday - leapMonth; + if (mday < (31 * 5)) { + IndianMonth = (int32_t)uprv_floor(mday / 31) + 1; + IndianDayOfMonth = (mday % 31) + 1; + } else { + mday -= 31 * 5; + IndianMonth = (int32_t)uprv_floor(mday / 30) + 6; + IndianDayOfMonth = (mday % 30) + 1; + } + } + + internalSet(UCAL_ERA, 0); + internalSet(UCAL_EXTENDED_YEAR, IndianYear); + internalSet(UCAL_YEAR, IndianYear); + internalSet(UCAL_MONTH, IndianMonth); + internalSet(UCAL_DAY_OF_MONTH, IndianDayOfMonth ); +} + +UBool +IndianCalendar::inDaylightTime(UErrorCode& status) const +{ + // copied from GregorianCalendar + if (U_FAILURE(status) || !getTimeZone().useDaylightTime()) { + return FALSE; + } + + // Force an update of the state of the Calendar. + ((IndianCalendar*)this)->complete(status); // cast away const + + return (UBool)(U_SUCCESS(status) ? (internalGet(UCAL_DST_OFFSET) != 0) : FALSE); +} + +// default century +const UDate IndianCalendar::fgSystemDefaultCentury = DBL_MIN; +const int32_t IndianCalendar::fgSystemDefaultCenturyYear = -1; + +UDate IndianCalendar::fgSystemDefaultCenturyStart = DBL_MIN; +int32_t IndianCalendar::fgSystemDefaultCenturyStartYear = -1; + + +UBool IndianCalendar::haveDefaultCentury() const +{ + return TRUE; +} + +UDate IndianCalendar::defaultCenturyStart() const +{ + return internalGetDefaultCenturyStart(); +} + +int32_t IndianCalendar::defaultCenturyStartYear() const +{ + return internalGetDefaultCenturyStartYear(); +} + +UDate +IndianCalendar::internalGetDefaultCenturyStart() const +{ + // lazy-evaluate systemDefaultCenturyStart + UBool needsUpdate; + { + Mutex m; + needsUpdate = (fgSystemDefaultCenturyStart == fgSystemDefaultCentury); + } + + if (needsUpdate) { + initializeSystemDefaultCentury(); + } + + // use defaultCenturyStart unless it's the flag value; + // then use systemDefaultCenturyStart + + return fgSystemDefaultCenturyStart; +} + +int32_t +IndianCalendar::internalGetDefaultCenturyStartYear() const +{ + // lazy-evaluate systemDefaultCenturyStartYear + UBool needsUpdate; + { + Mutex m; + + needsUpdate = (fgSystemDefaultCenturyStart == fgSystemDefaultCentury); + } + + if (needsUpdate) { + initializeSystemDefaultCentury(); + } + + // use defaultCenturyStart unless it's the flag value; + // then use systemDefaultCenturyStartYear + + return fgSystemDefaultCenturyStartYear; +} + +void +IndianCalendar::initializeSystemDefaultCentury() +{ + // initialize systemDefaultCentury and systemDefaultCenturyYear based + // on the current time. They'll be set to 80 years before + // the current time. + // No point in locking as it should be idempotent. + if (fgSystemDefaultCenturyStart == fgSystemDefaultCentury) { + UErrorCode status = U_ZERO_ERROR; + + IndianCalendar calendar(Locale("@calendar=Indian"),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); + + { + Mutex m; + + fgSystemDefaultCenturyStart = newStart; + fgSystemDefaultCenturyStartYear = newYear; + } + } + + // We have no recourse upon failure unless we want to propagate the failure + // out. + } +} + +UOBJECT_DEFINE_RTTI_IMPLEMENTATION(IndianCalendar) + +U_NAMESPACE_END + +#endif + diff --git a/icu4c/source/i18n/indiancal.h b/icu4c/source/i18n/indiancal.h new file mode 100644 index 0000000000..94a6e9cf00 --- /dev/null +++ b/icu4c/source/i18n/indiancal.h @@ -0,0 +1,371 @@ +/* + * Copyright (C) 2003-2007, International Business Machines Corporation + * and others. All Rights Reserved. + ****************************************************************************** + * + * File INDIANCAL.H + ***************************************************************************** + */ + +#ifndef INDIANCAL_H +#define INDIANCAL_H + +#include "unicode/utypes.h" + +#if !UCONFIG_NO_FORMATTING + +#include "unicode/calendar.h" + +U_NAMESPACE_BEGIN + +/** + * Concrete class which provides the Indian calendar. + *

+ * IndianCalendar is a subclass of Calendar + * that numbers years since the begining of SAKA ERA. This is the civil calendar + * which is accepted by government of India as Indian National Calendar. + * The two calendars most widely used in India today are the Vikrama calendar + * followed in North India and the Shalivahana or Saka calendar which is followed + * in South India and Maharashtra. + + * A variant of the Shalivahana Calendar was reformed and standardized as the + * Indian National calendar in 1957. + *

+ * Some details of Indian National Calendar (to be implemented) : + * The Months + * Month Length Start date (Gregorian) + * ================================================= + * 1 Chaitra 30/31 March 22* + * 2 Vaisakha 31 April 21 + * 3 Jyaistha 31 May 22 + * 4 Asadha 31 June 22 + * 5 Sravana 31 July 23 + * 6 Bhadra 31 August 23 + * 7 Asvina 30 September 23 + * 8 Kartika 30 October 23 + * 9 Agrahayana 30 November 22 + * 10 Pausa 30 December 22 + * 11 Magha 30 January 21 + * 12 Phalguna 30 February 20 + + * In leap years, Chaitra has 31 days and starts on March 21 instead. + * The leap years of Gregorian calendar and Indian National Calendar are in synchornization. + * So When its a leap year in Gregorian calendar then Chaitra has 31 days. + * + * The Years + * Years are counted in the Saka Era, which starts its year 0 in 78AD (by gregorian calendar). + * So for eg. 9th June 2006 by Gregorian Calendar, is same as 19th of Jyaistha in 1928 of Saka + * era by Indian National Calendar. + *

+ * The Indian Calendar has only one allowable era: Saka Era. If the + * calendar is not in lenient mode (see setLenient), dates before + * 1/1/1 Saka Era are rejected with an IllegalArgumentException. + *

+ * @internal + */ + + +class U_I18N_API IndianCalendar : public Calendar { + public: + /** + * Useful constants for IndianCalendar. + * @internal + */ + enum EEras { + /** + * Constant for Chaitra, the 1st month of the Indian year. + */ + CHAITRA, + + /** + * Constant for Vaisakha, the 2nd month of the Indian year. + */ + VAISAKHA, + + /** + * Constant for Jyaistha, the 3rd month of the Indian year. + */ + JYAISTHA, + + /** + * Constant for Asadha, the 4th month of the Indian year. + */ + ASADHA, + + /** + * Constant for Sravana, the 5th month of the Indian year. + */ + SRAVANA, + + /** + * Constant for Bhadra the 6th month of the Indian year + */ + BHADRA, + + /** + * Constant for the Asvina, the 7th month of the Indian year. + */ + ASVINA, + + /** + * Constant for Kartika, the 8th month of the Indian year. + */ + KARTIKA, + + /** + * Constant for Agrahayana, the 9th month of the Indian year. + */ + AGRAHAYANA, + + /** + * Constant for Pausa, the 10th month of the Indian year. + */ + PAUSA, + + /** + * Constant for Magha, the 11th month of the Indian year. + */ + MAGHA, + + /** + * Constant for Phalguna, the 12th month of the Indian year. + */ + PHALGUNA + }; + + //------------------------------------------------------------------------- + // Constructors... + //------------------------------------------------------------------------- + + /** + * Constructs an IndianCalendar based on the current time in the default time zone + * with the given locale. + * + * @param aLocale The given locale. + * @param success Indicates the status of IndianCalendar object construction. + * Returns U_ZERO_ERROR if constructed successfully. + * @param beCivil Whether the calendar should be civil (default-TRUE) or religious (FALSE) + * @internal + */ + IndianCalendar(const Locale& aLocale, UErrorCode &success); + + /** + * Copy Constructor + * @internal + */ + IndianCalendar(const IndianCalendar& other); + + /** + * Destructor. + * @internal + */ + virtual ~IndianCalendar(); + + /** + * Determines whether this object uses the fixed-cycle Indian civil calendar + * or an approximation of the religious, astronomical calendar. + * + * @param beCivil CIVIL to use the civil calendar, + * ASTRONOMICAL to use the astronomical calendar. + * @internal + */ + //void setCivil(ECivil beCivil, UErrorCode &status); + + /** + * Returns true if this object is using the fixed-cycle civil + * calendar, or false if using the religious, astronomical + * calendar. + * @internal + */ + //UBool isCivil(); + + + // TODO: copy c'tor, etc + + // clone + virtual Calendar* clone() const; + + private: + /** + * Determine whether a year is the gregorian year a leap year + */ + //static UBool isGregorianLeap(int32_t year); + //---------------------------------------------------------------------- + // Calendar framework + //---------------------------------------------------------------------- + protected: + /** + * @internal + */ + virtual int32_t handleGetLimit(UCalendarDateFields field, ELimitType limitType) const; + + /** + * Return the length (in days) of the given month. + * + * @param year The year in Saka era + * @param year The month(0-based) in Indian year + * @internal + */ + virtual int32_t handleGetMonthLength(int32_t extendedYear, int32_t month) const; + + /** + * Return the number of days in the given Indian year + * @internal + */ + virtual int32_t handleGetYearLength(int32_t extendedYear) const; + + //------------------------------------------------------------------------- + // Functions for converting from field values to milliseconds.... + //------------------------------------------------------------------------- + + // Return JD of start of given month/year + /** + * @internal + */ + virtual int32_t handleComputeMonthStart(int32_t eyear, int32_t month, UBool useMonth) const; + + //------------------------------------------------------------------------- + // Functions for converting from milliseconds to field values + //------------------------------------------------------------------------- + + /** + * @internal + */ + virtual int32_t handleGetExtendedYear(); + + /** + * Override Calendar to compute several fields specific to the Indian + * calendar system. These are: + * + *

  • ERA + *
  • YEAR + *
  • MONTH + *
  • DAY_OF_MONTH + *
  • DAY_OF_YEAR + *
  • EXTENDED_YEAR
+ * + * The DAY_OF_WEEK and DOW_LOCAL fields are already set when this + * method is called. The getGregorianXxx() methods return Gregorian + * calendar equivalents for the given Julian day. + * @internal + */ + virtual void handleComputeFields(int32_t julianDay, UErrorCode &status); + + // UObject stuff + public: + /** + * @return The class ID for this object. All objects of a given class have the + * same class ID. Objects of other classes have different class IDs. + * @internal + */ + virtual UClassID getDynamicClassID(void) const; + + /** + * Return the class ID for this class. This is useful only for comparing to a return + * value from getDynamicClassID(). For example: + * + * Base* polymorphic_pointer = createPolymorphicObject(); + * if (polymorphic_pointer->getDynamicClassID() == + * Derived::getStaticClassID()) ... + * + * @return The class ID for all objects of this class. + * @internal + */ + static UClassID U_EXPORT2 getStaticClassID(void); + + /** + * return the calendar type, "buddhist". + * + * @return calendar type + * @internal + */ + virtual const char * getType() const; + + private: + IndianCalendar(); // default constructor not implemented + + // Default century. + protected: + + /** + * (Overrides Calendar) Return true if the current date for this Calendar is in + * Daylight Savings Time. Recognizes DST_OFFSET, if it is set. + * + * @param status Fill-in parameter which receives the status of this operation. + * @return True if the current date for this Calendar is in Daylight Savings Time, + * false, otherwise. + * @internal + */ + virtual UBool inDaylightTime(UErrorCode& status) const; + + + /** + * Returns TRUE because the Indian Calendar does have a default century + * @internal + */ + virtual UBool haveDefaultCentury() const; + + /** + * Returns the date of the start of the default century + * @return start of century - in milliseconds since epoch, 1970 + * @internal + */ + virtual UDate defaultCenturyStart() const; + + /** + * Returns the year in which the default century begins + * @internal + */ + virtual int32_t defaultCenturyStartYear() const; + + private: // default century stuff. + /** + * The system maintains a static default century start date. This is initialized + * the first time it is used. Before then, it is set to SYSTEM_DEFAULT_CENTURY to + * indicate an uninitialized state. Once the system default century date and year + * are set, they do not change. + */ + static UDate fgSystemDefaultCenturyStart; + + /** + * See documentation for systemDefaultCenturyStart. + */ + static int32_t fgSystemDefaultCenturyStartYear; + + /** + * Default value that indicates the defaultCenturyStartYear is unitialized + */ + static const int32_t fgSystemDefaultCenturyYear; + + /** + * start of default century, as a date + */ + static const UDate fgSystemDefaultCentury; + + /** + * Returns the beginning date of the 100-year window that dates + * with 2-digit years are considered to fall within. + */ + UDate internalGetDefaultCenturyStart(void) const; + + /** + * Returns the first year of the 100-year window that dates with + * 2-digit years are considered to fall within. + */ + int32_t internalGetDefaultCenturyStartYear(void) const; + + /** + * Initializes the 100-year window that dates with 2-digit years + * are considered to fall within so that its start date is 80 years + * before the current time. + */ + static void initializeSystemDefaultCentury(void); +}; + +U_NAMESPACE_END + +#endif +#endif + + +