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 #if defined(_MSC_VER)
22 // Ignore warning 4661 as LocalPointerBase does not use operator== or operator!=
23 #pragma warning(push)
24 #pragma warning(disable: 4661)
25 #endif
26 template class U_I18N_API LocalPointerBase<int32_t>;
27 template class U_I18N_API LocalMemory<int32_t>;
28 #if defined(_MSC_VER)
29 #pragma warning(pop)
30 #endif
31 #endif
32 
33 class U_I18N_API EraRules : public UMemory {
34 public:
35     ~EraRules();
36 
37     static EraRules* createInstance(const char *calType, UBool includeTentativeEra, UErrorCode& status);
38 
39     /**
40      * Gets number of effective eras
41      * @return  number of effective eras
42      */
getNumberOfEras()43     inline int32_t getNumberOfEras() const {
44         return numEras;
45     }
46 
47     /**
48      * Gets start date of an era
49      * @param eraIdx    Era index
50      * @param fields    Receives date fields. The result includes values of year, month,
51      *                  day of month in this order. When an era has no start date, the result
52      *                  will be January 1st in year whose value is minimum integer.
53      * @param status    Receives status.
54      */
55     void getStartDate(int32_t eraIdx, int32_t (&fields)[3], UErrorCode& status) const;
56 
57     /**
58      * Gets start year of an era
59      * @param eraIdx    Era index
60      * @param status    Receives status.
61      * @return The first year of an era. When a era has no start date, minimum int32
62      *          value is returned.
63      */
64     int32_t getStartYear(int32_t eraIdx, UErrorCode& status) const;
65 
66     /**
67      * Returns era index for the specified year/month/day.
68      * @param year  Year
69      * @param month Month (1-base)
70      * @param day   Day of month
71      * @param status    Receives status
72      * @return  era index (or 0, when the specified date is before the first era)
73      */
74     int32_t getEraIndex(int32_t year, int32_t month, int32_t day, UErrorCode& status) const;
75 
76     /**
77      * Gets the current era index. This is calculated only once for an instance of
78      * EraRules. The current era calculation is based on the default time zone at
79      * the time of instantiation.
80      *
81      * @return era index of current era (or 0, when current date is before the first era)
82      */
getCurrentEraIndex()83     inline int32_t getCurrentEraIndex() const {
84         return currentEra;
85     }
86 
87 private:
88     EraRules(LocalMemory<int32_t>& eraStartDates, int32_t numEra);
89 
90     void initCurrentEra();
91 
92     LocalMemory<int32_t> startDates;
93     int32_t numEras;
94     int32_t currentEra;
95 };
96 
97 U_NAMESPACE_END
98 #endif /* #if !UCONFIG_NO_FORMATTING */
99 #endif /* ERARULES_H_ */
100