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243 lines
7.7 KiB
C++
243 lines
7.7 KiB
C++
/*
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********************************************************************************
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* Copyright (C) 2003-2007, International Business Machines Corporation
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* and others. All Rights Reserved.
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********************************************************************************
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*
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* File BUDDHCAL.H
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*
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* Modification History:
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*
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* Date Name Description
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* 05/13/2003 srl copied from gregocal.h
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********************************************************************************
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*/
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#ifndef BUDDHCAL_H
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#define BUDDHCAL_H
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#include "unicode/utypes.h"
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#if !UCONFIG_NO_FORMATTING
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#include "unicode/calendar.h"
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#include "unicode/gregocal.h"
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U_NAMESPACE_BEGIN
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/**
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* Concrete class which provides the Buddhist calendar.
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* <P>
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* <code>BuddhistCalendar</code> is a subclass of <code>GregorianCalendar</code>
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* that numbers years since the birth of the Buddha. This is the civil calendar
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* in some predominantly Buddhist countries such as Thailand, and it is used for
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* religious purposes elsewhere.
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* <p>
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* The Buddhist calendar is identical to the Gregorian calendar in all respects
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* except for the year and era. Years are numbered since the birth of the
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* Buddha in 543 BC (Gregorian), so that 1 AD (Gregorian) is equivalent to 544
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* BE (Buddhist Era) and 1998 AD is 2541 BE.
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* <p>
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* The Buddhist Calendar has only one allowable era: <code>BE</code>. If the
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* calendar is not in lenient mode (see <code>setLenient</code>), dates before
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* 1/1/1 BE are rejected as an illegal argument.
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* <p>
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* @internal
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*/
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class BuddhistCalendar : public GregorianCalendar {
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public:
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/**
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* Useful constants for BuddhistCalendar. Only one Era.
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* @internal
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*/
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enum EEras {
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BE
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};
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/**
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* Constructs a BuddhistCalendar based on the current time in the default time zone
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* with the given locale.
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*
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* @param aLocale The given locale.
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* @param success Indicates the status of BuddhistCalendar object construction.
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* Returns U_ZERO_ERROR if constructed successfully.
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* @internal
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*/
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BuddhistCalendar(const Locale& aLocale, UErrorCode& success);
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/**
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* Destructor
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* @internal
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*/
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virtual ~BuddhistCalendar();
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/**
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* Copy constructor
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* @param source the object to be copied.
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* @internal
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*/
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BuddhistCalendar(const BuddhistCalendar& source);
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/**
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* Default assignment operator
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* @param right the object to be copied.
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* @internal
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*/
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BuddhistCalendar& operator=(const BuddhistCalendar& right);
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/**
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* Create and return a polymorphic copy of this calendar.
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* @return return a polymorphic copy of this calendar.
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* @internal
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*/
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virtual Calendar* clone(void) const;
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public:
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/**
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* Override Calendar Returns a unique class ID POLYMORPHICALLY. Pure virtual
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* override. This method is to implement a simple version of RTTI, since not all C++
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* compilers support genuine RTTI. Polymorphic operator==() and clone() methods call
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* this method.
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*
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* @return The class ID for this object. All objects of a given class have the
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* same class ID. Objects of other classes have different class IDs.
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* @internal
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*/
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virtual UClassID getDynamicClassID(void) const;
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/**
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* Return the class ID for this class. This is useful only for comparing to a return
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* value from getDynamicClassID(). For example:
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*
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* Base* polymorphic_pointer = createPolymorphicObject();
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* if (polymorphic_pointer->getDynamicClassID() ==
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* Derived::getStaticClassID()) ...
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*
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* @return The class ID for all objects of this class.
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* @internal
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*/
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U_I18N_API static UClassID U_EXPORT2 getStaticClassID(void);
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/**
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* return the calendar type, "buddhist".
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*
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* @return calendar type
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* @internal
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*/
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virtual const char * getType() const;
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private:
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BuddhistCalendar(); // default constructor not implemented
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protected:
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/**
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* Return the extended year defined by the current fields. This will
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* use the UCAL_EXTENDED_YEAR field or the UCAL_YEAR and supra-year fields (such
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* as UCAL_ERA) specific to the calendar system, depending on which set of
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* fields is newer.
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* @return the extended year
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* @internal
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*/
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virtual int32_t handleGetExtendedYear();
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/**
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* Subclasses may override this method to compute several fields
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* specific to each calendar system.
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* @internal
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*/
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virtual void handleComputeFields(int32_t julianDay, UErrorCode& status);
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/**
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* Subclass API for defining limits of different types.
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* @param field one of the field numbers
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* @param limitType one of <code>MINIMUM</code>, <code>GREATEST_MINIMUM</code>,
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* <code>LEAST_MAXIMUM</code>, or <code>MAXIMUM</code>
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* @internal
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*/
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virtual int32_t handleGetLimit(UCalendarDateFields field, ELimitType limitType) const;
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/**
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* Return the Julian day number of day before the first day of the
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* given month in the given extended year. Subclasses should override
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* this method to implement their calendar system.
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* @param eyear the extended year
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* @param month the zero-based month, or 0 if useMonth is false
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* @param useMonth if false, compute the day before the first day of
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* the given year, otherwise, compute the day before the first day of
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* the given month
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* @param return the Julian day number of the day before the first
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* day of the given month and year
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* @internal
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*/
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virtual int32_t handleComputeMonthStart(int32_t eyear, int32_t month,
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UBool useMonth) const;
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/**
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* Returns TRUE because the Buddhist Calendar does have a default century
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* @internal
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*/
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virtual UBool haveDefaultCentury() const;
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/**
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* Returns the date of the start of the default century
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* @return start of century - in milliseconds since epoch, 1970
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* @internal
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*/
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virtual UDate defaultCenturyStart() const;
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/**
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* Returns the year in which the default century begins
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* @internal
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*/
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virtual int32_t defaultCenturyStartYear() const;
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private: // default century stuff.
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/**
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* The system maintains a static default century start date. This is initialized
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* the first time it is used. Before then, it is set to SYSTEM_DEFAULT_CENTURY to
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* indicate an uninitialized state. Once the system default century date and year
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* are set, they do not change.
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*/
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static UDate fgSystemDefaultCenturyStart;
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/**
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* See documentation for systemDefaultCenturyStart.
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*/
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static int32_t fgSystemDefaultCenturyStartYear;
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/**
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* Default value that indicates the defaultCenturyStartYear is unitialized
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*/
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static const int32_t fgSystemDefaultCenturyYear;
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/**
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* start of default century, as a date
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*/
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static const UDate fgSystemDefaultCentury;
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/**
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* Returns the beginning date of the 100-year window that dates
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* with 2-digit years are considered to fall within.
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*/
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UDate internalGetDefaultCenturyStart(void) const;
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/**
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* Returns the first year of the 100-year window that dates with
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* 2-digit years are considered to fall within.
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*/
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int32_t internalGetDefaultCenturyStartYear(void) const;
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/**
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* Initializes the 100-year window that dates with 2-digit years
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* are considered to fall within so that its start date is 80 years
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* before the current time.
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*/
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static void initializeSystemDefaultCentury(void);
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};
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U_NAMESPACE_END
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#endif /* #if !UCONFIG_NO_FORMATTING */
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#endif // _GREGOCAL
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//eof
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