* BuddhistCalendar is a subclass of GregorianCalendar
* that numbers years since the birth of the Buddha. This is the civil calendar
* in some predominantly Buddhist countries such as Thailand, and it is used for
* religious purposes elsewhere.
*
* The Buddhist calendar is identical to the Gregorian calendar in all respects * except for the year and era. Years are numbered since the birth of the * Buddha in 543 BC (Gregorian), so that 1 AD (Gregorian) is equivalent to 544 * BE (Buddhist Era) and 1998 AD is 2541 BE. *
* The Buddhist Calendar has only one allowable era: BE. If the
* calendar is not in lenient mode (see setLenient), dates before
* 1/1/1 BE are rejected as an illegal argument.
*
* @internal
*/
class BuddhistCalendar : public GregorianCalendar {
public:
/**
* Useful constants for BuddhistCalendar. Only one Era.
* @internal
*/
enum EEras {
BE
};
/**
* Constructs a BuddhistCalendar 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 BuddhistCalendar object construction.
* Returns U_ZERO_ERROR if constructed successfully.
* @internal
*/
BuddhistCalendar(const Locale& aLocale, UErrorCode& success);
/**
* Destructor
* @internal
*/
virtual ~BuddhistCalendar();
/**
* Copy constructor
* @param source the object to be copied.
* @internal
*/
BuddhistCalendar(const BuddhistCalendar& source);
/**
* Default assignment operator
* @param right the object to be copied.
* @internal
*/
BuddhistCalendar& operator=(const BuddhistCalendar& right);
/**
* Create and return a polymorphic copy of this calendar.
* @return return a polymorphic copy of this calendar.
* @internal
*/
virtual Calendar* clone(void) 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, "buddhist".
*
* @return calendar type
* @internal
*/
virtual const char * getType() const;
private:
BuddhistCalendar(); // default constructor not implemented
protected:
/**
* 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();
/**
* Subclasses may override this method to compute several fields
* specific to each calendar system.
* @internal
*/
virtual void handleComputeFields(int32_t julianDay, UErrorCode& status);
/**
* Subclass API for defining limits of different types.
* @param field one of the field numbers
* @param limitType one of MINIMUM, GREATEST_MINIMUM,
* LEAST_MAXIMUM, or MAXIMUM
* @internal
*/
virtual int32_t handleGetLimit(UCalendarDateFields field, ELimitType limitType) 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
* @param 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;
/**
* Returns TRUE because the Buddhist 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 /* #if !UCONFIG_NO_FORMATTING */
#endif // _GREGOCAL
//eof