* JapaneseCalendar is a subclass of GregorianCalendar
* that numbers years and eras based on the reigns of the Japanese emperors.
* The Japanese calendar is identical to the Gregorian calendar in all respects
* except for the year and era. The ascension of each emperor to the throne
* begins a new era, and the years of that era are numbered starting with the
* year of ascension as year 1.
*
* Note that in the year of an imperial ascension, there are two possible sets * of year and era values: that for the old era and for the new. For example, a * new era began on January 7, 1989 AD. Strictly speaking, the first six days * of that year were in the Showa era, e.g. "January 6, 64 Showa", while the rest * of the year was in the Heisei era, e.g. "January 7, 1 Heisei". This class * handles this distinction correctly when computing dates. However, in lenient * mode either form of date is acceptable as input. *
* In modern times, eras have started on January 8, 1868 AD, Gregorian (Meiji),
* July 30, 1912 (Taisho), December 25, 1926 (Showa), and January 7, 1989 (Heisei). Constants
* for these eras, suitable for use in the UCAL_ERA field, are provided
* in this class. Note that the number used for each era is more or
* less arbitrary. Currently, the era starting in 1053 AD is era #0; however this
* may change in the future as we add more historical data. Use the predefined
* constants rather than using actual, absolute numbers.
*
* @internal */ class JapaneseCalendar : public GregorianCalendar { public: /** * Useful constants for JapaneseCalendar. * @internal */ U_I18N_API static uint32_t U_EXPORT2 getCurrentEra(void); // the current era /** * Constructs a JapaneseCalendar 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 JapaneseCalendar object construction. * Returns U_ZERO_ERROR if constructed successfully. * @stable ICU 2.0 */ JapaneseCalendar(const Locale& aLocale, UErrorCode& success); /** * Destructor * @internal */ virtual ~JapaneseCalendar(); /** * Copy constructor * @param source the object to be copied. * @internal */ JapaneseCalendar(const JapaneseCalendar& source); /** * Default assignment operator * @param right the object to be copied. * @internal */ JapaneseCalendar& operator=(const JapaneseCalendar& right); /** * Create and return a polymorphic copy of this calendar. * @return return a polymorphic copy of this calendar. * @internal */ virtual Calendar* clone(void) const; /** * Return the extended year defined by the current fields. In the * Japanese calendar case, this is equal to the equivalent extended Gregorian year. * @internal */ virtual int32_t handleGetExtendedYear(); /** * Return the maximum value that this field could have, given the current date. * @internal */ virtual int32_t getActualMaximum(UCalendarDateFields field, UErrorCode& status) const; 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. * @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 */ U_I18N_API static UClassID U_EXPORT2 getStaticClassID(void); /** * return the calendar type, "japanese". * * @return calendar type * @internal */ virtual const char * getType() const; /** * @return FALSE - no default century in Japanese * @internal */ virtual UBool haveDefaultCentury() const; /** * Not used - no default century. * @internal */ virtual UDate defaultCenturyStart() const; /** * Not used - no default century. * @internal */ virtual int32_t defaultCenturyStartYear() const; private: JapaneseCalendar(); // default constructor not implemented protected: /** * Calculate the era for internal computation * @internal */ virtual int32_t internalGetEra() const; /** * Compute fields from the JD * @internal */ virtual void handleComputeFields(int32_t julianDay, UErrorCode& status); /** * Calculate the limit for a specified type of limit and field * @internal */ virtual int32_t handleGetLimit(UCalendarDateFields field, ELimitType limitType) const; /*** * Called by computeJulianDay. Returns the default month (0-based) for the year, * taking year and era into account. Will return the first month of the given era, if * the current year is an ascension year. * @param eyear the extended year * @internal */ virtual int32_t getDefaultMonthInYear(int32_t eyear); /*** * Called by computeJulianDay. Returns the default day (1-based) for the month, * taking currently-set year and era into account. Will return the first day of the given * era, if the current month is an ascension year and month. * @param eyear the extended year * @param mon the month in the year * @internal */ virtual int32_t getDefaultDayInMonth(int32_t eyear, int32_t month); }; U_NAMESPACE_END #endif /* #if !UCONFIG_NO_FORMATTING */ #endif //eof