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diff --git a/intl/icu/source/i18n/unicode/gregocal.h b/intl/icu/source/i18n/unicode/gregocal.h new file mode 100644 index 0000000000..b85deb5ecf --- /dev/null +++ b/intl/icu/source/i18n/unicode/gregocal.h @@ -0,0 +1,755 @@ +// © 2016 and later: Unicode, Inc. and others. +// License & terms of use: http://www.unicode.org/copyright.html +/* +* Copyright (C) 1997-2013, International Business Machines Corporation and others. +* All Rights Reserved. +******************************************************************************** +* +* File GREGOCAL.H +* +* Modification History: +* +* Date Name Description +* 04/22/97 aliu Overhauled header. +* 07/28/98 stephen Sync with JDK 1.2 +* 09/04/98 stephen Re-sync with JDK 8/31 putback +* 09/14/98 stephen Changed type of kOneDay, kOneWeek to double. +* Fixed bug in roll() +* 10/15/99 aliu Fixed j31, incorrect WEEK_OF_YEAR computation. +* Added documentation of WEEK_OF_YEAR computation. +* 10/15/99 aliu Fixed j32, cannot set date to Feb 29 2000 AD. +* {JDK bug 4210209 4209272} +* 11/07/2003 srl Update, clean up documentation. +******************************************************************************** +*/ + +#ifndef GREGOCAL_H +#define GREGOCAL_H + +#include "unicode/utypes.h" + +#if U_SHOW_CPLUSPLUS_API + +#if !UCONFIG_NO_FORMATTING + +#include "unicode/calendar.h" + +/** + * \file + * \brief C++ API: Concrete class which provides the standard calendar. + */ + +U_NAMESPACE_BEGIN + +/** + * Concrete class which provides the standard calendar used by most of the world. + * <P> + * The standard (Gregorian) calendar has 2 eras, BC and AD. + * <P> + * This implementation handles a single discontinuity, which corresponds by default to + * the date the Gregorian calendar was originally instituted (October 15, 1582). Not all + * countries adopted the Gregorian calendar then, so this cutover date may be changed by + * the caller. + * <P> + * Prior to the institution of the Gregorian Calendar, New Year's Day was March 25. To + * avoid confusion, this Calendar always uses January 1. A manual adjustment may be made + * if desired for dates that are prior to the Gregorian changeover and which fall + * between January 1 and March 24. + * + * <p>Values calculated for the <code>WEEK_OF_YEAR</code> field range from 1 to + * 53. Week 1 for a year is the first week that contains at least + * <code>getMinimalDaysInFirstWeek()</code> days from that year. It thus + * depends on the values of <code>getMinimalDaysInFirstWeek()</code>, + * <code>getFirstDayOfWeek()</code>, and the day of the week of January 1. + * Weeks between week 1 of one year and week 1 of the following year are + * numbered sequentially from 2 to 52 or 53 (as needed). + * + * <p>For example, January 1, 1998 was a Thursday. If + * <code>getFirstDayOfWeek()</code> is <code>MONDAY</code> and + * <code>getMinimalDaysInFirstWeek()</code> is 4 (these are the values + * reflecting ISO 8601 and many national standards), then week 1 of 1998 starts + * on December 29, 1997, and ends on January 4, 1998. If, however, + * <code>getFirstDayOfWeek()</code> is <code>SUNDAY</code>, then week 1 of 1998 + * starts on January 4, 1998, and ends on January 10, 1998; the first three days + * of 1998 then are part of week 53 of 1997. + * + * <p>Example for using GregorianCalendar: + * <pre> + * \code + * // get the supported ids for GMT-08:00 (Pacific Standard Time) + * UErrorCode success = U_ZERO_ERROR; + * const StringEnumeration *ids = TimeZone::createEnumeration(-8 * 60 * 60 * 1000, success); + * // if no ids were returned, something is wrong. get out. + * if (U_FAILURE(success)) { + * return; + * } + * + * // begin output + * cout << "Current Time" << endl; + * + * // create a Pacific Standard Time time zone + * SimpleTimeZone* pdt = new SimpleTimeZone(-8 * 60 * 60 * 1000, ids->unext(nullptr, success))); + * + * // set up rules for daylight savings time + * pdt->setStartRule(UCAL_MARCH, 1, UCAL_SUNDAY, 2 * 60 * 60 * 1000); + * pdt->setEndRule(UCAL_NOVEMBER, 2, UCAL_SUNDAY, 2 * 60 * 60 * 1000); + * + * // create a GregorianCalendar with the Pacific Daylight time zone + * // and the current date and time + * Calendar* calendar = new GregorianCalendar( pdt, success ); + * + * // print out a bunch of interesting things + * cout << "ERA: " << calendar->get( UCAL_ERA, success ) << endl; + * cout << "YEAR: " << calendar->get( UCAL_YEAR, success ) << endl; + * cout << "MONTH: " << calendar->get( UCAL_MONTH, success ) << endl; + * cout << "WEEK_OF_YEAR: " << calendar->get( UCAL_WEEK_OF_YEAR, success ) << endl; + * cout << "WEEK_OF_MONTH: " << calendar->get( UCAL_WEEK_OF_MONTH, success ) << endl; + * cout << "DATE: " << calendar->get( UCAL_DATE, success ) << endl; + * cout << "DAY_OF_MONTH: " << calendar->get( UCAL_DAY_OF_MONTH, success ) << endl; + * cout << "DAY_OF_YEAR: " << calendar->get( UCAL_DAY_OF_YEAR, success ) << endl; + * cout << "DAY_OF_WEEK: " << calendar->get( UCAL_DAY_OF_WEEK, success ) << endl; + * cout << "DAY_OF_WEEK_IN_MONTH: " << calendar->get( UCAL_DAY_OF_WEEK_IN_MONTH, success ) << endl; + * cout << "AM_PM: " << calendar->get( UCAL_AM_PM, success ) << endl; + * cout << "HOUR: " << calendar->get( UCAL_HOUR, success ) << endl; + * cout << "HOUR_OF_DAY: " << calendar->get( UCAL_HOUR_OF_DAY, success ) << endl; + * cout << "MINUTE: " << calendar->get( UCAL_MINUTE, success ) << endl; + * cout << "SECOND: " << calendar->get( UCAL_SECOND, success ) << endl; + * cout << "MILLISECOND: " << calendar->get( UCAL_MILLISECOND, success ) << endl; + * cout << "ZONE_OFFSET: " << (calendar->get( UCAL_ZONE_OFFSET, success )/(60*60*1000)) << endl; + * cout << "DST_OFFSET: " << (calendar->get( UCAL_DST_OFFSET, success )/(60*60*1000)) << endl; + * + * cout << "Current Time, with hour reset to 3" << endl; + * calendar->clear(UCAL_HOUR_OF_DAY); // so doesn't override + * calendar->set(UCAL_HOUR, 3); + * cout << "ERA: " << calendar->get( UCAL_ERA, success ) << endl; + * cout << "YEAR: " << calendar->get( UCAL_YEAR, success ) << endl; + * cout << "MONTH: " << calendar->get( UCAL_MONTH, success ) << endl; + * cout << "WEEK_OF_YEAR: " << calendar->get( UCAL_WEEK_OF_YEAR, success ) << endl; + * cout << "WEEK_OF_MONTH: " << calendar->get( UCAL_WEEK_OF_MONTH, success ) << endl; + * cout << "DATE: " << calendar->get( UCAL_DATE, success ) << endl; + * cout << "DAY_OF_MONTH: " << calendar->get( UCAL_DAY_OF_MONTH, success ) << endl; + * cout << "DAY_OF_YEAR: " << calendar->get( UCAL_DAY_OF_YEAR, success ) << endl; + * cout << "DAY_OF_WEEK: " << calendar->get( UCAL_DAY_OF_WEEK, success ) << endl; + * cout << "DAY_OF_WEEK_IN_MONTH: " << calendar->get( UCAL_DAY_OF_WEEK_IN_MONTH, success ) << endl; + * cout << "AM_PM: " << calendar->get( UCAL_AM_PM, success ) << endl; + * cout << "HOUR: " << calendar->get( UCAL_HOUR, success ) << endl; + * cout << "HOUR_OF_DAY: " << calendar->get( UCAL_HOUR_OF_DAY, success ) << endl; + * cout << "MINUTE: " << calendar->get( UCAL_MINUTE, success ) << endl; + * cout << "SECOND: " << calendar->get( UCAL_SECOND, success ) << endl; + * cout << "MILLISECOND: " << calendar->get( UCAL_MILLISECOND, success ) << endl; + * cout << "ZONE_OFFSET: " << (calendar->get( UCAL_ZONE_OFFSET, success )/(60*60*1000)) << endl; // in hours + * cout << "DST_OFFSET: " << (calendar->get( UCAL_DST_OFFSET, success )/(60*60*1000)) << endl; // in hours + * + * if (U_FAILURE(success)) { + * cout << "An error occurred. success=" << u_errorName(success) << endl; + * } + * + * delete ids; + * delete calendar; // also deletes pdt + * \endcode + * </pre> + * @stable ICU 2.0 + */ +class U_I18N_API GregorianCalendar: public Calendar { +public: + + /** + * Useful constants for GregorianCalendar and TimeZone. + * @stable ICU 2.0 + */ + enum EEras { + BC, + AD + }; + + /** + * Constructs a default GregorianCalendar using the current time in the default time + * zone with the default locale. + * + * @param success Indicates the status of GregorianCalendar object construction. + * Returns U_ZERO_ERROR if constructed successfully. + * @stable ICU 2.0 + */ + GregorianCalendar(UErrorCode& success); + + /** + * Constructs a GregorianCalendar based on the current time in the given time zone + * with the default locale. Clients are no longer responsible for deleting the given + * time zone object after it's adopted. + * + * @param zoneToAdopt The given timezone. + * @param success Indicates the status of GregorianCalendar object construction. + * Returns U_ZERO_ERROR if constructed successfully. + * @stable ICU 2.0 + */ + GregorianCalendar(TimeZone* zoneToAdopt, UErrorCode& success); + + /** + * Constructs a GregorianCalendar based on the current time in the given time zone + * with the default locale. + * + * @param zone The given timezone. + * @param success Indicates the status of GregorianCalendar object construction. + * Returns U_ZERO_ERROR if constructed successfully. + * @stable ICU 2.0 + */ + GregorianCalendar(const TimeZone& zone, UErrorCode& success); + + /** + * Constructs a GregorianCalendar 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 GregorianCalendar object construction. + * Returns U_ZERO_ERROR if constructed successfully. + * @stable ICU 2.0 + */ + GregorianCalendar(const Locale& aLocale, UErrorCode& success); + + /** + * Constructs a GregorianCalendar based on the current time in the given time zone + * with the given locale. Clients are no longer responsible for deleting the given + * time zone object after it's adopted. + * + * @param zoneToAdopt The given timezone. + * @param aLocale The given locale. + * @param success Indicates the status of GregorianCalendar object construction. + * Returns U_ZERO_ERROR if constructed successfully. + * @stable ICU 2.0 + */ + GregorianCalendar(TimeZone* zoneToAdopt, const Locale& aLocale, UErrorCode& success); + + /** + * Constructs a GregorianCalendar based on the current time in the given time zone + * with the given locale. + * + * @param zone The given timezone. + * @param aLocale The given locale. + * @param success Indicates the status of GregorianCalendar object construction. + * Returns U_ZERO_ERROR if constructed successfully. + * @stable ICU 2.0 + */ + GregorianCalendar(const TimeZone& zone, const Locale& aLocale, UErrorCode& success); + + /** + * Constructs a GregorianCalendar with the given AD date set in the default time + * zone with the default locale. + * + * @param year The value used to set the YEAR time field in the calendar. + * @param month The value used to set the MONTH time field in the calendar. Month + * value is 0-based. e.g., 0 for January. + * @param date The value used to set the DATE time field in the calendar. + * @param success Indicates the status of GregorianCalendar object construction. + * Returns U_ZERO_ERROR if constructed successfully. + * @stable ICU 2.0 + */ + GregorianCalendar(int32_t year, int32_t month, int32_t date, UErrorCode& success); + + /** + * Constructs a GregorianCalendar with the given AD date and time set for the + * default time zone with the default locale. + * + * @param year The value used to set the YEAR time field in the calendar. + * @param month The value used to set the MONTH time field in the calendar. Month + * value is 0-based. e.g., 0 for January. + * @param date The value used to set the DATE time field in the calendar. + * @param hour The value used to set the HOUR_OF_DAY time field in the calendar. + * @param minute The value used to set the MINUTE time field in the calendar. + * @param success Indicates the status of GregorianCalendar object construction. + * Returns U_ZERO_ERROR if constructed successfully. + * @stable ICU 2.0 + */ + GregorianCalendar(int32_t year, int32_t month, int32_t date, int32_t hour, int32_t minute, UErrorCode& success); + + /** + * Constructs a GregorianCalendar with the given AD date and time set for the + * default time zone with the default locale. + * + * @param year The value used to set the YEAR time field in the calendar. + * @param month The value used to set the MONTH time field in the calendar. Month + * value is 0-based. e.g., 0 for January. + * @param date The value used to set the DATE time field in the calendar. + * @param hour The value used to set the HOUR_OF_DAY time field in the calendar. + * @param minute The value used to set the MINUTE time field in the calendar. + * @param second The value used to set the SECOND time field in the calendar. + * @param success Indicates the status of GregorianCalendar object construction. + * Returns U_ZERO_ERROR if constructed successfully. + * @stable ICU 2.0 + */ + GregorianCalendar(int32_t year, int32_t month, int32_t date, int32_t hour, int32_t minute, int32_t second, UErrorCode& success); + + /** + * Destructor + * @stable ICU 2.0 + */ + virtual ~GregorianCalendar(); + + /** + * Copy constructor + * @param source the object to be copied. + * @stable ICU 2.0 + */ + GregorianCalendar(const GregorianCalendar& source); + + /** + * Default assignment operator + * @param right the object to be copied. + * @stable ICU 2.0 + */ + GregorianCalendar& operator=(const GregorianCalendar& right); + + /** + * Create and return a polymorphic copy of this calendar. + * @return return a polymorphic copy of this calendar. + * @stable ICU 2.0 + */ + virtual GregorianCalendar* clone() const override; + + /** + * Sets the GregorianCalendar change date. This is the point when the switch from + * Julian dates to Gregorian dates occurred. Default is 00:00:00 local time, October + * 15, 1582. Previous to this time and date will be Julian dates. + * + * @param date The given Gregorian cutover date. + * @param success Output param set to success/failure code on exit. + * @stable ICU 2.0 + */ + void setGregorianChange(UDate date, UErrorCode& success); + + /** + * Gets the Gregorian Calendar change date. This is the point when the switch from + * Julian dates to Gregorian dates occurred. Default is 00:00:00 local time, October + * 15, 1582. Previous to this time and date will be Julian dates. + * + * @return The Gregorian cutover time for this calendar. + * @stable ICU 2.0 + */ + UDate getGregorianChange(void) const; + + /** + * Return true if the given year is a leap year. Determination of whether a year is + * a leap year is actually very complicated. We do something crude and mostly + * correct here, but for a real determination you need a lot of contextual + * information. For example, in Sweden, the change from Julian to Gregorian happened + * in a complex way resulting in missed leap years and double leap years between + * 1700 and 1753. Another example is that after the start of the Julian calendar in + * 45 B.C., the leap years did not regularize until 8 A.D. This method ignores these + * quirks, and pays attention only to the Julian onset date and the Gregorian + * cutover (which can be changed). + * + * @param year The given year. + * @return True if the given year is a leap year; false otherwise. + * @stable ICU 2.0 + */ + UBool isLeapYear(int32_t year) const; + + /** + * Returns true if the given Calendar object is equivalent to this + * one. Calendar override. + * + * @param other the Calendar to be compared with this Calendar + * @stable ICU 2.4 + */ + virtual UBool isEquivalentTo(const Calendar& other) const override; + +#ifndef U_FORCE_HIDE_DEPRECATED_API + /** + * (Overrides Calendar) Rolls up or down by the given amount in the specified field. + * For more information, see the documentation for Calendar::roll(). + * + * @param field The time field. + * @param amount Indicates amount to roll. + * @param status Output param set to success/failure code on exit. If any value + * previously set in the time field is invalid, this will be set to + * an error status. + * @deprecated ICU 2.6. Use roll(UCalendarDateFields field, int32_t amount, UErrorCode& status) instead. + */ + virtual void roll(EDateFields field, int32_t amount, UErrorCode& status) override; +#endif // U_FORCE_HIDE_DEPRECATED_API + + /** + * (Overrides Calendar) Rolls up or down by the given amount in the specified field. + * For more information, see the documentation for Calendar::roll(). + * + * @param field The time field. + * @param amount Indicates amount to roll. + * @param status Output param set to success/failure code on exit. If any value + * previously set in the time field is invalid, this will be set to + * an error status. + * @stable ICU 2.6. + */ + virtual void roll(UCalendarDateFields field, int32_t amount, UErrorCode& status) override; + +#ifndef U_HIDE_DEPRECATED_API + /** + * Return the minimum value that this field could have, given the current date. + * For the Gregorian calendar, this is the same as getMinimum() and getGreatestMinimum(). + * @param field the time field. + * @return the minimum value that this field could have, given the current date. + * @deprecated ICU 2.6. Use getActualMinimum(UCalendarDateFields field) instead. + */ + int32_t getActualMinimum(EDateFields field) const; + + /** + * Return the minimum value that this field could have, given the current date. + * For the Gregorian calendar, this is the same as getMinimum() and getGreatestMinimum(). + * @param field the time field. + * @param status + * @return the minimum value that this field could have, given the current date. + * @deprecated ICU 2.6. Use getActualMinimum(UCalendarDateFields field) instead. (Added to ICU 3.0 for signature consistency) + */ + int32_t getActualMinimum(EDateFields field, UErrorCode& status) const; +#endif /* U_HIDE_DEPRECATED_API */ + + /** + * Return the minimum value that this field could have, given the current date. + * For the Gregorian calendar, this is the same as getMinimum() and getGreatestMinimum(). + * @param field the time field. + * @param status error result. + * @return the minimum value that this field could have, given the current date. + * @stable ICU 3.0 + */ + int32_t getActualMinimum(UCalendarDateFields field, UErrorCode &status) const override; + + /** + * Return the maximum value that this field could have, given the current date. + * For example, with the date "Feb 3, 1997" and the DAY_OF_MONTH field, the actual + * maximum would be 28; for "Feb 3, 1996" it s 29. Similarly for a Hebrew calendar, + * for some years the actual maximum for MONTH is 12, and for others 13. + * @param field the time field. + * @param status returns any errors that may result from this function call. + * @return the maximum value that this field could have, given the current date. + * @stable ICU 2.6 + */ + virtual int32_t getActualMaximum(UCalendarDateFields field, UErrorCode& status) const override; + +public: + + /** + * Override Calendar Returns a unique class ID POLYMORPHICALLY. Pure virtual + * override. This method is to implement a simple version of RTTI, since not all C++ + * compilers support genuine RTTI. Polymorphic operator==() and clone() methods call + * this method. + * + * @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. + * @stable ICU 2.0 + */ + virtual UClassID getDynamicClassID(void) const override; + + /** + * 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. + * @stable ICU 2.0 + */ + static UClassID U_EXPORT2 getStaticClassID(void); + + /** + * Returns the calendar type name string for this Calendar object. + * The returned string is the legacy ICU calendar attribute value, + * for example, "gregorian" or "japanese". + * + * For more details see the Calendar::getType() documentation. + * + * @return legacy calendar type name string + * @stable ICU 49 + */ + virtual const char * getType() const override; + + private: + GregorianCalendar() = delete; // default constructor not implemented + + protected: + /** + * Return the ERA. We need a special method for this because the + * default ERA is AD, but a zero (unset) ERA is BC. + * @return the ERA. + * @internal + */ + virtual int32_t internalGetEra() const; + + /** + * Return the Julian day number of day before the first day of the + * given month in the given extended year. Subclasses should override + * this method to implement their calendar system. + * @param eyear the extended year + * @param month the zero-based month, or 0 if useMonth is false + * @param useMonth if false, compute the day before the first day of + * the given year, otherwise, compute the day before the first day of + * the given month + * @return the Julian day number of the day before the first + * day of the given month and year + * @internal + */ + virtual int32_t handleComputeMonthStart(int32_t eyear, int32_t month, + UBool useMonth) const override; + + /** + * Subclasses may override this. This method calls + * handleGetMonthLength() to obtain the calendar-specific month + * length. + * @param bestField which field to use to calculate the date + * @return julian day specified by calendar fields. + * @internal + */ + virtual int32_t handleComputeJulianDay(UCalendarDateFields bestField) override; + + /** + * Return the number of days in the given month of the given extended + * year of this calendar system. Subclasses should override this + * method if they can provide a more correct or more efficient + * implementation than the default implementation in Calendar. + * @internal + */ + virtual int32_t handleGetMonthLength(int32_t extendedYear, int32_t month) const override; + + /** + * Return the number of days in the given extended year of this + * calendar system. Subclasses should override this method if they can + * provide a more correct or more efficient implementation than the + * default implementation in Calendar. + * @stable ICU 2.0 + */ + virtual int32_t handleGetYearLength(int32_t eyear) const override; + + /** + * return the length of the given month. + * @param month the given month. + * @return the length of the given month. + * @internal + */ + virtual int32_t monthLength(int32_t month) const; + + /** + * return the length of the month according to the given year. + * @param month the given month. + * @param year the given year. + * @return the length of the month + * @internal + */ + virtual int32_t monthLength(int32_t month, int32_t year) const; + +#ifndef U_HIDE_INTERNAL_API + /** + * return the length of the given year. + * @param year the given year. + * @return the length of the given year. + * @internal + */ + int32_t yearLength(int32_t year) const; + + /** + * return the length of the year field. + * @return the length of the year field + * @internal + */ + int32_t yearLength(void) const; + + /** + * After adjustments such as add(MONTH), add(YEAR), we don't want the + * month to jump around. E.g., we don't want Jan 31 + 1 month to go to Mar + * 3, we want it to go to Feb 28. Adjustments which might run into this + * problem call this method to retain the proper month. + * @internal + */ + void pinDayOfMonth(void); +#endif /* U_HIDE_INTERNAL_API */ + + /** + * Return the day number with respect to the epoch. January 1, 1970 (Gregorian) + * is day zero. + * @param status Fill-in parameter which receives the status of this operation. + * @return the day number with respect to the epoch. + * @internal + */ + virtual UDate getEpochDay(UErrorCode& status); + + /** + * Subclass API for defining limits of different types. + * Subclasses must implement this method to return limits for the + * following fields: + * + * <pre>UCAL_ERA + * UCAL_YEAR + * UCAL_MONTH + * UCAL_WEEK_OF_YEAR + * UCAL_WEEK_OF_MONTH + * UCAL_DATE (DAY_OF_MONTH on Java) + * UCAL_DAY_OF_YEAR + * UCAL_DAY_OF_WEEK_IN_MONTH + * UCAL_YEAR_WOY + * UCAL_EXTENDED_YEAR</pre> + * + * @param field one of the above field numbers + * @param limitType one of <code>MINIMUM</code>, <code>GREATEST_MINIMUM</code>, + * <code>LEAST_MAXIMUM</code>, or <code>MAXIMUM</code> + * @internal + */ + virtual int32_t handleGetLimit(UCalendarDateFields field, ELimitType limitType) const override; + + /** + * Return the extended year defined by the current fields. This will + * use the UCAL_EXTENDED_YEAR field or the UCAL_YEAR and supra-year fields (such + * as UCAL_ERA) specific to the calendar system, depending on which set of + * fields is newer. + * @return the extended year + * @internal + */ + virtual int32_t handleGetExtendedYear() override; + + /** + * Subclasses may override this to convert from week fields + * (YEAR_WOY and WEEK_OF_YEAR) to an extended year in the case + * where YEAR, EXTENDED_YEAR are not set. + * The Gregorian implementation assumes a yearWoy in gregorian format, according to the current era. + * @return the extended year, UCAL_EXTENDED_YEAR + * @internal + */ + virtual int32_t handleGetExtendedYearFromWeekFields(int32_t yearWoy, int32_t woy) override; + + + /** + * Subclasses may override this method to compute several fields + * specific to each calendar system. These are: + * + * <ul><li>ERA + * <li>YEAR + * <li>MONTH + * <li>DAY_OF_MONTH + * <li>DAY_OF_YEAR + * <li>EXTENDED_YEAR</ul> + * + * <p>The GregorianCalendar implementation implements + * a calendar with the specified Julian/Gregorian cutover date. + * @internal + */ + virtual void handleComputeFields(int32_t julianDay, UErrorCode &status) override; + + private: + /** + * Compute the julian day number of the given year. + * @param isGregorian if true, using Gregorian calendar, otherwise using Julian calendar + * @param year the given year. + * @param isLeap true if the year is a leap year. + * @return + */ + static double computeJulianDayOfYear(UBool isGregorian, int32_t year, + UBool& isLeap); + + /** + * Validates the values of the set time fields. True if they're all valid. + * @return True if the set time fields are all valid. + */ + UBool validateFields(void) const; + + /** + * Validates the value of the given time field. True if it's valid. + */ + UBool boundsCheck(int32_t value, UCalendarDateFields field) const; + + /** + * Return the pseudo-time-stamp for two fields, given their + * individual pseudo-time-stamps. If either of the fields + * is unset, then the aggregate is unset. Otherwise, the + * aggregate is the later of the two stamps. + * @param stamp_a One given field. + * @param stamp_b Another given field. + * @return the pseudo-time-stamp for two fields + */ + int32_t aggregateStamp(int32_t stamp_a, int32_t stamp_b); + + /** + * The point at which the Gregorian calendar rules are used, measured in + * milliseconds from the standard epoch. Default is October 15, 1582 + * (Gregorian) 00:00:00 UTC, that is, October 4, 1582 (Julian) is followed + * by October 15, 1582 (Gregorian). This corresponds to Julian day number + * 2299161. This is measured from the standard epoch, not in Julian Days. + */ + UDate fGregorianCutover; + + /** + * Julian day number of the Gregorian cutover + */ + int32_t fCutoverJulianDay; + + /** + * Midnight, local time (using this Calendar's TimeZone) at or before the + * gregorianCutover. This is a pure date value with no time of day or + * timezone component. + */ + UDate fNormalizedGregorianCutover;// = gregorianCutover; + + /** + * The year of the gregorianCutover, with 0 representing + * 1 BC, -1 representing 2 BC, etc. + */ + int32_t fGregorianCutoverYear;// = 1582; + + /** + * Converts time as milliseconds to Julian date. The Julian date used here is not a + * true Julian date, since it is measured from midnight, not noon. + * + * @param millis The given milliseconds. + * @return The Julian date number. + */ + static double millisToJulianDay(UDate millis); + + /** + * Converts Julian date to time as milliseconds. The Julian date used here is not a + * true Julian date, since it is measured from midnight, not noon. + * + * @param julian The given Julian date number. + * @return Time as milliseconds. + */ + static UDate julianDayToMillis(double julian); + + /** + * Used by handleComputeJulianDay() and handleComputeMonthStart(). + * Temporary field indicating whether the calendar is currently Gregorian as opposed to Julian. + */ + UBool fIsGregorian; + + /** + * Used by handleComputeJulianDay() and handleComputeMonthStart(). + * Temporary field indicating that the sense of the gregorian cutover should be inverted + * to handle certain calculations on and around the cutover date. + */ + UBool fInvertGregorian; + + + public: // internal implementation + + /** + * @return true if this calendar has the notion of a default century + * @internal + */ + virtual UBool haveDefaultCentury() const override; + + /** + * @return the start of the default century + * @internal + */ + virtual UDate defaultCenturyStart() const override; + + /** + * @return the beginning year of the default century + * @internal + */ + virtual int32_t defaultCenturyStartYear() const override; +}; + +U_NAMESPACE_END + +#endif /* #if !UCONFIG_NO_FORMATTING */ + +#endif /* U_SHOW_CPLUSPLUS_API */ + +#endif // _GREGOCAL +//eof + |