1 // Copyright (C) 2016 and later: Unicode, Inc. and others. 2 // License & terms of use: http://www.unicode.org/copyright.html 3 /* 4 ******************************************************************************** 5 * Copyright (C) 2003-2008, International Business Machines Corporation 6 * and others. All Rights Reserved. 7 ******************************************************************************** 8 * 9 * File JAPANCAL.H 10 * 11 * Modification History: 12 * 13 * Date Name Description 14 * 05/13/2003 srl copied from gregocal.h 15 ******************************************************************************** 16 */ 17 18 #ifndef JAPANCAL_H 19 #define JAPANCAL_H 20 21 #include "unicode/utypes.h" 22 23 #if !UCONFIG_NO_FORMATTING 24 25 #include "unicode/calendar.h" 26 #include "unicode/gregocal.h" 27 28 U_NAMESPACE_BEGIN 29 30 /** 31 * Concrete class which provides the Japanese calendar. 32 * <P> 33 * <code>JapaneseCalendar</code> is a subclass of <code>GregorianCalendar</code> 34 * that numbers years and eras based on the reigns of the Japanese emperors. 35 * The Japanese calendar is identical to the Gregorian calendar in all respects 36 * except for the year and era. The ascension of each emperor to the throne 37 * begins a new era, and the years of that era are numbered starting with the 38 * year of ascension as year 1. 39 * <p> 40 * Note that in the year of an imperial ascension, there are two possible sets 41 * of year and era values: that for the old era and for the new. For example, a 42 * new era began on January 7, 1989 AD. Strictly speaking, the first six days 43 * of that year were in the Showa era, e.g. "January 6, 64 Showa", while the rest 44 * of the year was in the Heisei era, e.g. "January 7, 1 Heisei". This class 45 * handles this distinction correctly when computing dates. However, in lenient 46 * mode either form of date is acceptable as input. 47 * <p> 48 * In modern times, eras have started on January 8, 1868 AD, Gregorian (Meiji), 49 * July 30, 1912 (Taisho), December 25, 1926 (Showa), and January 7, 1989 (Heisei). Constants 50 * for these eras, suitable for use in the <code>UCAL_ERA</code> field, are provided 51 * in this class. Note that the <em>number</em> used for each era is more or 52 * less arbitrary. Currently, the era starting in 1053 AD is era #0; however this 53 * may change in the future as we add more historical data. Use the predefined 54 * constants rather than using actual, absolute numbers. 55 * <p> 56 * @internal 57 */ 58 class JapaneseCalendar : public GregorianCalendar { 59 public: 60 61 /** 62 * Useful constants for JapaneseCalendar. 63 * @internal 64 */ 65 U_I18N_API static uint32_t U_EXPORT2 getCurrentEra(void); // the current era 66 67 /** 68 * Constructs a JapaneseCalendar based on the current time in the default time zone 69 * with the given locale. 70 * 71 * @param aLocale The given locale. 72 * @param success Indicates the status of JapaneseCalendar object construction. 73 * Returns U_ZERO_ERROR if constructed successfully. 74 * @stable ICU 2.0 75 */ 76 JapaneseCalendar(const Locale& aLocale, UErrorCode& success); 77 78 79 /** 80 * Destructor 81 * @internal 82 */ 83 virtual ~JapaneseCalendar(); 84 85 /** 86 * Copy constructor 87 * @param source the object to be copied. 88 * @internal 89 */ 90 JapaneseCalendar(const JapaneseCalendar& source); 91 92 /** 93 * Default assignment operator 94 * @param right the object to be copied. 95 * @internal 96 */ 97 JapaneseCalendar& operator=(const JapaneseCalendar& right); 98 99 /** 100 * Create and return a polymorphic copy of this calendar. 101 * @return return a polymorphic copy of this calendar. 102 * @internal 103 */ 104 virtual Calendar* clone(void) const; 105 106 /** 107 * Return the extended year defined by the current fields. In the 108 * Japanese calendar case, this is equal to the equivalent extended Gregorian year. 109 * @internal 110 */ 111 virtual int32_t handleGetExtendedYear(); 112 113 /** 114 * Return the maximum value that this field could have, given the current date. 115 * @internal 116 */ 117 virtual int32_t getActualMaximum(UCalendarDateFields field, UErrorCode& status) const; 118 119 120 public: 121 /** 122 * Override Calendar Returns a unique class ID POLYMORPHICALLY. Pure virtual 123 * override. This method is to implement a simple version of RTTI, since not all C++ 124 * compilers support genuine RTTI. Polymorphic operator==() and clone() methods call 125 * this method. 126 * 127 * @return The class ID for this object. All objects of a given class have the 128 * same class ID. Objects of other classes have different class IDs. 129 * @internal 130 */ 131 virtual UClassID getDynamicClassID(void) const; 132 133 /** 134 * Return the class ID for this class. This is useful only for comparing to a return 135 * value from getDynamicClassID(). For example: 136 * 137 * Base* polymorphic_pointer = createPolymorphicObject(); 138 * if (polymorphic_pointer->getDynamicClassID() == 139 * Derived::getStaticClassID()) ... 140 * 141 * @return The class ID for all objects of this class. 142 * @internal 143 */ 144 U_I18N_API static UClassID U_EXPORT2 getStaticClassID(void); 145 146 /** 147 * return the calendar type, "japanese". 148 * 149 * @return calendar type 150 * @internal 151 */ 152 virtual const char * getType() const; 153 154 /** 155 * @return FALSE - no default century in Japanese 156 * @internal 157 */ 158 virtual UBool haveDefaultCentury() const; 159 160 /** 161 * Not used - no default century. 162 * @internal 163 */ 164 virtual UDate defaultCenturyStart() const; 165 /** 166 * Not used - no default century. 167 * @internal 168 */ 169 virtual int32_t defaultCenturyStartYear() const; 170 171 private: 172 JapaneseCalendar(); // default constructor not implemented 173 174 protected: 175 /** 176 * Calculate the era for internal computation 177 * @internal 178 */ 179 virtual int32_t internalGetEra() const; 180 181 /** 182 * Compute fields from the JD 183 * @internal 184 */ 185 virtual void handleComputeFields(int32_t julianDay, UErrorCode& status); 186 187 /** 188 * Calculate the limit for a specified type of limit and field 189 * @internal 190 */ 191 virtual int32_t handleGetLimit(UCalendarDateFields field, ELimitType limitType) const; 192 193 /*** 194 * Called by computeJulianDay. Returns the default month (0-based) for the year, 195 * taking year and era into account. Will return the first month of the given era, if 196 * the current year is an ascension year. 197 * @param eyear the extended year 198 * @internal 199 */ 200 virtual int32_t getDefaultMonthInYear(int32_t eyear); 201 202 /*** 203 * Called by computeJulianDay. Returns the default day (1-based) for the month, 204 * taking currently-set year and era into account. Will return the first day of the given 205 * era, if the current month is an ascension year and month. 206 * @param eyear the extended year 207 * @param mon the month in the year 208 * @internal 209 */ 210 virtual int32_t getDefaultDayInMonth(int32_t eyear, int32_t month); 211 }; 212 213 U_NAMESPACE_END 214 215 #endif /* #if !UCONFIG_NO_FORMATTING */ 216 217 #endif 218 //eof 219 220