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| // © 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. | |
| ******************************************************************************** | |
| */ | |
| /** | |
| * \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; | |
| /** | |
| * (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; | |
| /** | |
| * (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; | |
| /** | |
| * 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; | |
| /** | |
| * 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; | |
| /** | |
| * 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); | |
| /** | |
| * 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 | |
| //eof | |