235 lines
7.6 KiB
C++
235 lines
7.6 KiB
C++
// © 2016 and later: Unicode, Inc. and others.
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// License & terms of use: http://www.unicode.org/copyright.html
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/*
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********************************************************************************
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* Copyright (C) 2003-2008, 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 JAPANCAL.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 JAPANCAL_H
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#define JAPANCAL_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 Japanese calendar.
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* <P>
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* <code>JapaneseCalendar</code> is a subclass of <code>GregorianCalendar</code>
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* that numbers years and eras based on the reigns of the Japanese emperors.
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* The Japanese calendar is identical to the Gregorian calendar in all respects
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* except for the year and era. The ascension of each emperor to the throne
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* begins a new era, and the years of that era are numbered starting with the
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* year of ascension as year 1.
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* <p>
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* Note that in the year of an imperial ascension, there are two possible sets
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* of year and era values: that for the old era and for the new. For example, a
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* new era began on January 7, 1989 AD. Strictly speaking, the first six days
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* of that year were in the Showa era, e.g. "January 6, 64 Showa", while the rest
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* of the year was in the Heisei era, e.g. "January 7, 1 Heisei". This class
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* handles this distinction correctly when computing dates. However, in lenient
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* mode either form of date is acceptable as input.
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* <p>
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* In modern times, eras have started on January 8, 1868 AD, Gregorian (Meiji),
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* July 30, 1912 (Taisho), December 25, 1926 (Showa), and January 7, 1989 (Heisei). Constants
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* for these eras, suitable for use in the <code>UCAL_ERA</code> field, are provided
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* in this class. Note that the <em>number</em> used for each era is more or
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* less arbitrary. Currently, the era starting in 645 AD is era #0; however this
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* may change in the future. Use the predefined constants rather than using actual,
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* absolute numbers.
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* <p>
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* Since ICU4C 63, start date of each era is imported from CLDR. CLDR era data
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* may contain tentative era in near future with placeholder names. By default,
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* such era data is not enabled. ICU4C users who want to test the behavior of
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* the future era can enable this one of following settings (in the priority
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* order):
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* <ol>
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* <li>Environment variable <code>ICU_ENABLE_TENTATIVE_ERA=true</code>.</li>
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* </nl>
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* @internal
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*/
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class JapaneseCalendar : public GregorianCalendar {
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public:
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/**
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* Check environment variable.
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* @internal
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*/
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U_I18N_API static UBool U_EXPORT2 enableTentativeEra(void);
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/**
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* Useful constants for JapaneseCalendar.
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* Exported for use by test code.
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* @internal
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*/
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U_I18N_API static uint32_t U_EXPORT2 getCurrentEra(void); // the current era
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/**
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* Constructs a JapaneseCalendar 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 JapaneseCalendar object construction.
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* Returns U_ZERO_ERROR if constructed successfully.
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* @stable ICU 2.0
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*/
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JapaneseCalendar(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 ~JapaneseCalendar();
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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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JapaneseCalendar(const JapaneseCalendar& 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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JapaneseCalendar& operator=(const JapaneseCalendar& 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 JapaneseCalendar* clone() const override;
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/**
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* Return the extended year defined by the current fields. In the
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* Japanese calendar case, this is equal to the equivalent extended Gregorian year.
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* @internal
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*/
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virtual int32_t handleGetExtendedYear() override;
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/**
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* Return the maximum value that this field could have, given the current date.
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* @internal
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*/
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virtual int32_t getActualMaximum(UCalendarDateFields field, UErrorCode& status) const override;
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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 override;
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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, "japanese".
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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 override;
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/**
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* @return false - no default century in Japanese
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* @internal
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*/
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virtual UBool haveDefaultCentury() const override;
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/**
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* Not used - no default century.
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* @internal
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*/
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virtual UDate defaultCenturyStart() const override;
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/**
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* Not used - no default century.
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* @internal
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*/
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virtual int32_t defaultCenturyStartYear() const override;
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private:
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JapaneseCalendar(); // default constructor not implemented
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protected:
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/**
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* Calculate the era for internal computation
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* @internal
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*/
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virtual int32_t internalGetEra() const override;
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/**
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* Compute fields from the JD
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* @internal
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*/
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virtual void handleComputeFields(int32_t julianDay, UErrorCode& status) override;
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/**
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* Calculate the limit for a specified type of limit and field
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* @internal
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*/
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virtual int32_t handleGetLimit(UCalendarDateFields field, ELimitType limitType) const override;
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/***
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* Called by computeJulianDay. Returns the default month (0-based) for the year,
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* taking year and era into account. Will return the first month of the given era, if
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* the current year is an ascension year.
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* @param eyear the extended year
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* @internal
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*/
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virtual int32_t getDefaultMonthInYear(int32_t eyear) override;
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/***
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* Called by computeJulianDay. Returns the default day (1-based) for the month,
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* taking currently-set year and era into account. Will return the first day of the given
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* era, if the current month is an ascension year and month.
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* @param eyear the extended year
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* @param mon the month in the year
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* @internal
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*/
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virtual int32_t getDefaultDayInMonth(int32_t eyear, int32_t month) override;
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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
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//eof
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