1 /* 2 ****************************************************************************** 3 * Copyright (C) 2003-2013, International Business Machines Corporation 4 * and others. All Rights Reserved. 5 ****************************************************************************** 6 * 7 * File PERSNCAL.CPP 8 * 9 * Modification History: 10 * 11 * Date Name Description 12 * 9/23/2003 mehran posted to icu-design 13 * 10/1/2012 roozbeh Fixed algorithm and heavily refactored and rewrote 14 * based on the implementation of Gregorian 15 ***************************************************************************** 16 */ 17 18 #include "persncal.h" 19 20 #if !UCONFIG_NO_FORMATTING 21 22 #include "umutex.h" 23 #include "gregoimp.h" // Math 24 #include <float.h> 25 26 static const int16_t kPersianNumDays[] 27 = {0,31,62,93,124,155,186,216,246,276,306,336}; // 0-based, for day-in-year 28 static const int8_t kPersianMonthLength[] 29 = {31,31,31,31,31,31,30,30,30,30,30,29}; // 0-based 30 static const int8_t kPersianLeapMonthLength[] 31 = {31,31,31,31,31,31,30,30,30,30,30,30}; // 0-based 32 33 static const int32_t kPersianCalendarLimits[UCAL_FIELD_COUNT][4] = { 34 // Minimum Greatest Least Maximum 35 // Minimum Maximum 36 { 0, 0, 0, 0}, // ERA 37 { -5000000, -5000000, 5000000, 5000000}, // YEAR 38 { 0, 0, 11, 11}, // MONTH 39 { 1, 1, 52, 53}, // WEEK_OF_YEAR 40 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // WEEK_OF_MONTH 41 { 1, 1, 29, 31}, // DAY_OF_MONTH 42 { 1, 1, 365, 366}, // DAY_OF_YEAR 43 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // DAY_OF_WEEK 44 { 1, 1, 5, 5}, // DAY_OF_WEEK_IN_MONTH 45 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // AM_PM 46 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // HOUR 47 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // HOUR_OF_DAY 48 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // MINUTE 49 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // SECOND 50 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // MILLISECOND 51 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // ZONE_OFFSET 52 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // DST_OFFSET 53 { -5000000, -5000000, 5000000, 5000000}, // YEAR_WOY 54 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // DOW_LOCAL 55 { -5000000, -5000000, 5000000, 5000000}, // EXTENDED_YEAR 56 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // JULIAN_DAY 57 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // MILLISECONDS_IN_DAY 58 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // IS_LEAP_MONTH 59 }; 60 61 U_NAMESPACE_BEGIN 62 63 static const int32_t PERSIAN_EPOCH = 1948320; 64 65 // Implementation of the PersianCalendar class 66 67 //------------------------------------------------------------------------- 68 // Constructors... 69 //------------------------------------------------------------------------- 70 71 const char *PersianCalendar::getType() const { 72 return "persian"; 73 } 74 75 Calendar* PersianCalendar::clone() const { 76 return new PersianCalendar(*this); 77 } 78 79 PersianCalendar::PersianCalendar(const Locale& aLocale, UErrorCode& success) 80 : Calendar(TimeZone::createDefault(), aLocale, success) 81 { 82 setTimeInMillis(getNow(), success); // Call this again now that the vtable is set up properly. 83 } 84 85 PersianCalendar::PersianCalendar(const PersianCalendar& other) : Calendar(other) { 86 } 87 88 PersianCalendar::~PersianCalendar() 89 { 90 } 91 92 //------------------------------------------------------------------------- 93 // Minimum / Maximum access functions 94 //------------------------------------------------------------------------- 95 96 97 int32_t PersianCalendar::handleGetLimit(UCalendarDateFields field, ELimitType limitType) const { 98 return kPersianCalendarLimits[field][limitType]; 99 } 100 101 //------------------------------------------------------------------------- 102 // Assorted calculation utilities 103 // 104 105 /** 106 * Determine whether a year is a leap year in the Persian calendar 107 */ 108 UBool PersianCalendar::isLeapYear(int32_t year) 109 { 110 int32_t remainder; 111 ClockMath::floorDivide(25 * year + 11, 33, remainder); 112 return (remainder < 8); 113 } 114 115 /** 116 * Return the day # on which the given year starts. Days are counted 117 * from the Persian epoch, origin 0. 118 */ 119 int32_t PersianCalendar::yearStart(int32_t year) { 120 return handleComputeMonthStart(year,0,FALSE); 121 } 122 123 /** 124 * Return the day # on which the given month starts. Days are counted 125 * from the Persian epoch, origin 0. 126 * 127 * @param year The Persian year 128 * @param year The Persian month, 0-based 129 */ 130 int32_t PersianCalendar::monthStart(int32_t year, int32_t month) const { 131 return handleComputeMonthStart(year,month,TRUE); 132 } 133 134 //---------------------------------------------------------------------- 135 // Calendar framework 136 //---------------------------------------------------------------------- 137 138 /** 139 * Return the length (in days) of the given month. 140 * 141 * @param year The Persian year 142 * @param year The Persian month, 0-based 143 */ 144 int32_t PersianCalendar::handleGetMonthLength(int32_t extendedYear, int32_t month) const { 145 // If the month is out of range, adjust it into range, and 146 // modify the extended year value accordingly. 147 if (month < 0 || month > 11) { 148 extendedYear += ClockMath::floorDivide(month, 12, month); 149 } 150 151 return isLeapYear(extendedYear) ? kPersianLeapMonthLength[month] : kPersianMonthLength[month]; 152 } 153 154 /** 155 * Return the number of days in the given Persian year 156 */ 157 int32_t PersianCalendar::handleGetYearLength(int32_t extendedYear) const { 158 return isLeapYear(extendedYear) ? 366 : 365; 159 } 160 161 //------------------------------------------------------------------------- 162 // Functions for converting from field values to milliseconds.... 163 //------------------------------------------------------------------------- 164 165 // Return JD of start of given month/year 166 int32_t PersianCalendar::handleComputeMonthStart(int32_t eyear, int32_t month, UBool /*useMonth*/) const { 167 // If the month is out of range, adjust it into range, and 168 // modify the extended year value accordingly. 169 if (month < 0 || month > 11) { 170 eyear += ClockMath::floorDivide(month, 12, month); 171 } 172 173 int32_t julianDay = PERSIAN_EPOCH - 1 + 365 * (eyear - 1) + ClockMath::floorDivide(8 * eyear + 21, 33); 174 175 if (month != 0) { 176 julianDay += kPersianNumDays[month]; 177 } 178 179 return julianDay; 180 } 181 182 //------------------------------------------------------------------------- 183 // Functions for converting from milliseconds to field values 184 //------------------------------------------------------------------------- 185 186 int32_t PersianCalendar::handleGetExtendedYear() { 187 int32_t year; 188 if (newerField(UCAL_EXTENDED_YEAR, UCAL_YEAR) == UCAL_EXTENDED_YEAR) { 189 year = internalGet(UCAL_EXTENDED_YEAR, 1); // Default to year 1 190 } else { 191 year = internalGet(UCAL_YEAR, 1); // Default to year 1 192 } 193 return year; 194 } 195 196 /** 197 * Override Calendar to compute several fields specific to the Persian 198 * calendar system. These are: 199 * 200 * <ul><li>ERA 201 * <li>YEAR 202 * <li>MONTH 203 * <li>DAY_OF_MONTH 204 * <li>DAY_OF_YEAR 205 * <li>EXTENDED_YEAR</ul> 206 * 207 * The DAY_OF_WEEK and DOW_LOCAL fields are already set when this 208 * method is called. 209 */ 210 void PersianCalendar::handleComputeFields(int32_t julianDay, UErrorCode &/*status*/) { 211 int32_t year, month, dayOfMonth, dayOfYear; 212 213 int32_t daysSinceEpoch = julianDay - PERSIAN_EPOCH; 214 year = 1 + ClockMath::floorDivide(33 * daysSinceEpoch + 3, 12053); 215 216 int32_t farvardin1 = 365 * (year - 1) + ClockMath::floorDivide(8 * year + 21, 33); 217 dayOfYear = (daysSinceEpoch - farvardin1); // 0-based 218 if (dayOfYear < 216) { // Compute 0-based month 219 month = dayOfYear / 31; 220 } else { 221 month = (dayOfYear - 6) / 30; 222 } 223 dayOfMonth = dayOfYear - kPersianNumDays[month] + 1; 224 ++dayOfYear; // Make it 1-based now 225 226 internalSet(UCAL_ERA, 0); 227 internalSet(UCAL_YEAR, year); 228 internalSet(UCAL_EXTENDED_YEAR, year); 229 internalSet(UCAL_MONTH, month); 230 internalSet(UCAL_DAY_OF_MONTH, dayOfMonth); 231 internalSet(UCAL_DAY_OF_YEAR, dayOfYear); 232 } 233 234 UBool 235 PersianCalendar::inDaylightTime(UErrorCode& status) const 236 { 237 // copied from GregorianCalendar 238 if (U_FAILURE(status) || !getTimeZone().useDaylightTime()) 239 return FALSE; 240 241 // Force an update of the state of the Calendar. 242 ((PersianCalendar*)this)->complete(status); // cast away const 243 244 return (UBool)(U_SUCCESS(status) ? (internalGet(UCAL_DST_OFFSET) != 0) : FALSE); 245 } 246 247 // default century 248 249 static UDate gSystemDefaultCenturyStart = DBL_MIN; 250 static int32_t gSystemDefaultCenturyStartYear = -1; 251 static icu::UInitOnce gSystemDefaultCenturyInit = U_INITONCE_INITIALIZER; 252 253 UBool PersianCalendar::haveDefaultCentury() const 254 { 255 return TRUE; 256 } 257 258 static void U_CALLCONV initializeSystemDefaultCentury() { 259 // initialize systemDefaultCentury and systemDefaultCenturyYear based 260 // on the current time. They'll be set to 80 years before 261 // the current time. 262 UErrorCode status = U_ZERO_ERROR; 263 PersianCalendar calendar(Locale("@calendar=persian"),status); 264 if (U_SUCCESS(status)) 265 { 266 calendar.setTime(Calendar::getNow(), status); 267 calendar.add(UCAL_YEAR, -80, status); 268 269 gSystemDefaultCenturyStart = calendar.getTime(status); 270 gSystemDefaultCenturyStartYear = calendar.get(UCAL_YEAR, status); 271 } 272 // We have no recourse upon failure unless we want to propagate the failure 273 // out. 274 } 275 276 UDate PersianCalendar::defaultCenturyStart() const { 277 // lazy-evaluate systemDefaultCenturyStart 278 umtx_initOnce(gSystemDefaultCenturyInit, &initializeSystemDefaultCentury); 279 return gSystemDefaultCenturyStart; 280 } 281 282 int32_t PersianCalendar::defaultCenturyStartYear() const { 283 // lazy-evaluate systemDefaultCenturyStartYear 284 umtx_initOnce(gSystemDefaultCenturyInit, &initializeSystemDefaultCentury); 285 return gSystemDefaultCenturyStartYear; 286 } 287 288 UOBJECT_DEFINE_RTTI_IMPLEMENTATION(PersianCalendar) 289 290 U_NAMESPACE_END 291 292 #endif 293 294
