1 // © 2018 and later: Unicode, Inc. and others. 2 // License & terms of use: http://www.unicode.org/copyright.html 3 4 #ifndef ERARULES_H_ 5 #define ERARULES_H_ 6 7 #include "unicode/utypes.h" 8 9 #if !UCONFIG_NO_FORMATTING 10 11 #include "unicode/localpointer.h" 12 #include "unicode/uobject.h" 13 #include "cmemory.h" 14 15 U_NAMESPACE_BEGIN 16 17 // Export an explicit template instantiation of LocalMemory used as a data member of EraRules. 18 // When building DLLs for Windows this is required even though no direct access leaks out of the i18n library. 19 // See digitlst.h, pluralaffix.h, datefmt.h, and others for similar examples. 20 #if U_PF_WINDOWS <= U_PLATFORM && U_PLATFORM <= U_PF_CYGWIN 21 // Ignore warning 4661 as LocalPointerBase does not use operator== or operator!= 22 #pragma warning(suppress: 4661) 23 template class U_I18N_API LocalPointerBase<int32_t>; 24 template class U_I18N_API LocalMemory<int32_t>; 25 #endif 26 27 class U_I18N_API EraRules : public UMemory { 28 public: 29 ~EraRules(); 30 31 static EraRules* createInstance(const char *calType, UBool includeTentativeEra, UErrorCode& status); 32 33 /** 34 * Gets number of effective eras 35 * @return number of effective eras 36 */ getNumberOfEras()37 inline int32_t getNumberOfEras() const { 38 return numEras; 39 } 40 41 /** 42 * Gets start date of an era 43 * @param eraIdx Era index 44 * @param fields Receives date fields. The result includes values of year, month, 45 * day of month in this order. When an era has no start date, the result 46 * will be January 1st in year whose value is minimum integer. 47 * @param status Receives status. 48 */ 49 void getStartDate(int32_t eraIdx, int32_t (&fields)[3], UErrorCode& status) const; 50 51 /** 52 * Gets start year of an era 53 * @param eraIdx Era index 54 * @param status Receives status. 55 * @return The first year of an era. When a era has no start date, minimum int32 56 * value is returned. 57 */ 58 int32_t getStartYear(int32_t eraIdx, UErrorCode& status) const; 59 60 /** 61 * Returns era index for the specified year/month/day. 62 * @param year Year 63 * @param month Month (1-base) 64 * @param day Day of month 65 * @param status Receives status 66 * @return era index (or 0, when the specified date is before the first era) 67 */ 68 int32_t getEraIndex(int32_t year, int32_t month, int32_t day, UErrorCode& status) const; 69 70 /** 71 * Gets the current era index. This is calculated only once for an instance of 72 * EraRules. 73 * 74 * @return era index of current era (or 0, when current date is before the first era) 75 */ getCurrentEraIndex()76 inline int32_t getCurrentEraIndex() const { 77 return currentEra; 78 } 79 80 private: 81 EraRules(LocalMemory<int32_t>& eraStartDates, int32_t numEra); 82 83 void initCurrentEra(); 84 85 LocalMemory<int32_t> startDates; 86 int32_t numEras; 87 int32_t currentEra; 88 }; 89 90 U_NAMESPACE_END 91 #endif /* #if !UCONFIG_NO_FORMATTING */ 92 #endif /* ERARULES_H_ */ 93