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100 lines
3.1 KiB
100 lines
3.1 KiB
4 months ago
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// © 2018 and later: Unicode, Inc. and others.
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// License & terms of use: http://www.unicode.org/copyright.html
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#ifndef ERARULES_H_
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#define ERARULES_H_
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#include "unicode/utypes.h"
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#if !UCONFIG_NO_FORMATTING
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#include "unicode/localpointer.h"
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#include "unicode/uobject.h"
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#include "cmemory.h"
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U_NAMESPACE_BEGIN
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// Export an explicit template instantiation of LocalMemory used as a data member of EraRules.
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// When building DLLs for Windows this is required even though no direct access leaks out of the i18n library.
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// See digitlst.h, pluralaffix.h, datefmt.h, and others for similar examples.
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#if U_PF_WINDOWS <= U_PLATFORM && U_PLATFORM <= U_PF_CYGWIN
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#if defined(_MSC_VER)
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// Ignore warning 4661 as LocalPointerBase does not use operator== or operator!=
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#pragma warning(push)
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#pragma warning(disable: 4661)
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#endif
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template class U_I18N_API LocalPointerBase<int32_t>;
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template class U_I18N_API LocalMemory<int32_t>;
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#if defined(_MSC_VER)
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#pragma warning(pop)
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#endif
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#endif
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class U_I18N_API EraRules : public UMemory {
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public:
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~EraRules();
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static EraRules* createInstance(const char *calType, UBool includeTentativeEra, UErrorCode& status);
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/**
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* Gets number of effective eras
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* @return number of effective eras
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*/
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inline int32_t getNumberOfEras() const {
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return numEras;
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}
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/**
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* Gets start date of an era
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* @param eraIdx Era index
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* @param fields Receives date fields. The result includes values of year, month,
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* day of month in this order. When an era has no start date, the result
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* will be January 1st in year whose value is minimum integer.
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* @param status Receives status.
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*/
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void getStartDate(int32_t eraIdx, int32_t (&fields)[3], UErrorCode& status) const;
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/**
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* Gets start year of an era
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* @param eraIdx Era index
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* @param status Receives status.
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* @return The first year of an era. When a era has no start date, minimum int32
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* value is returned.
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*/
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int32_t getStartYear(int32_t eraIdx, UErrorCode& status) const;
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/**
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* Returns era index for the specified year/month/day.
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* @param year Year
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* @param month Month (1-base)
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* @param day Day of month
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* @param status Receives status
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* @return era index (or 0, when the specified date is before the first era)
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*/
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int32_t getEraIndex(int32_t year, int32_t month, int32_t day, UErrorCode& status) const;
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/**
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* Gets the current era index. This is calculated only once for an instance of
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* EraRules. The current era calculation is based on the default time zone at
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* the time of instantiation.
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*
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* @return era index of current era (or 0, when current date is before the first era)
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*/
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inline int32_t getCurrentEraIndex() const {
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return currentEra;
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}
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private:
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EraRules(LocalMemory<int32_t>& eraStartDates, int32_t numEra);
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void initCurrentEra();
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LocalMemory<int32_t> startDates;
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int32_t numEras;
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int32_t currentEra;
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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 /* ERARULES_H_ */
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