1 // Copyright (C) 2016 and later: Unicode, Inc. and others. 2 // License & terms of use: http://www.unicode.org/copyright.html 3 /* 4 * Copyright (C) 2003-2014, International Business Machines Corporation 5 * and others. All Rights Reserved. 6 ****************************************************************************** 7 * 8 * File INDIANCAL.CPP 9 ***************************************************************************** 10 */ 11 12 #include "indiancal.h" 13 #include <stdlib.h> 14 #if !UCONFIG_NO_FORMATTING 15 16 #include "mutex.h" 17 #include <float.h> 18 #include "gregoimp.h" // Math 19 #include "astro.h" // CalendarAstronomer 20 #include "uhash.h" 21 22 // Debugging 23 #ifdef U_DEBUG_INDIANCAL 24 #include <stdio.h> 25 #include <stdarg.h> 26 27 #endif 28 29 U_NAMESPACE_BEGIN 30 31 // Implementation of the IndianCalendar class 32 33 //------------------------------------------------------------------------- 34 // Constructors... 35 //------------------------------------------------------------------------- 36 37 38 Calendar* IndianCalendar::clone() const { 39 return new IndianCalendar(*this); 40 } 41 42 IndianCalendar::IndianCalendar(const Locale& aLocale, UErrorCode& success) 43 : Calendar(TimeZone::createDefault(), aLocale, success) 44 { 45 setTimeInMillis(getNow(), success); // Call this again now that the vtable is set up properly. 46 } 47 48 IndianCalendar::IndianCalendar(const IndianCalendar& other) : Calendar(other) { 49 } 50 51 IndianCalendar::~IndianCalendar() 52 { 53 } 54 const char *IndianCalendar::getType() const { 55 return "indian"; 56 } 57 58 static const int32_t LIMITS[UCAL_FIELD_COUNT][4] = { 59 // Minimum Greatest Least Maximum 60 // Minimum Maximum 61 { 0, 0, 0, 0}, // ERA 62 { -5000000, -5000000, 5000000, 5000000}, // YEAR 63 { 0, 0, 11, 11}, // MONTH 64 { 1, 1, 52, 53}, // WEEK_OF_YEAR 65 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // WEEK_OF_MONTH 66 { 1, 1, 30, 31}, // DAY_OF_MONTH 67 { 1, 1, 365, 366}, // DAY_OF_YEAR 68 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // DAY_OF_WEEK 69 { -1, -1, 5, 5}, // DAY_OF_WEEK_IN_MONTH 70 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // AM_PM 71 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // HOUR 72 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // HOUR_OF_DAY 73 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // MINUTE 74 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // SECOND 75 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // MILLISECOND 76 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // ZONE_OFFSET 77 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // DST_OFFSET 78 { -5000000, -5000000, 5000000, 5000000}, // YEAR_WOY 79 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // DOW_LOCAL 80 { -5000000, -5000000, 5000000, 5000000}, // EXTENDED_YEAR 81 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // JULIAN_DAY 82 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // MILLISECONDS_IN_DAY 83 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // IS_LEAP_MONTH 84 }; 85 86 static const double JULIAN_EPOCH = 1721425.5; 87 static const int32_t INDIAN_ERA_START = 78; 88 static const int32_t INDIAN_YEAR_START = 80; 89 90 int32_t IndianCalendar::handleGetLimit(UCalendarDateFields field, ELimitType limitType) const { 91 return LIMITS[field][limitType]; 92 } 93 94 /* 95 * Determine whether the given gregorian year is a Leap year 96 */ 97 static UBool isGregorianLeap(int32_t year) 98 { 99 return ((year % 4) == 0) && (!(((year % 100) == 0) && ((year % 400) != 0))); 100 } 101 102 //---------------------------------------------------------------------- 103 // Calendar framework 104 //---------------------------------------------------------------------- 105 106 /* 107 * Return the length (in days) of the given month. 108 * 109 * @param eyear The year in Saka Era 110 * @param month The month(0-based) in Indian calendar 111 */ 112 int32_t IndianCalendar::handleGetMonthLength(int32_t eyear, int32_t month) const { 113 if (month < 0 || month > 11) { 114 eyear += ClockMath::floorDivide(month, 12, month); 115 } 116 117 if (isGregorianLeap(eyear + INDIAN_ERA_START) && month == 0) { 118 return 31; 119 } 120 121 if (month >= 1 && month <= 5) { 122 return 31; 123 } 124 125 return 30; 126 } 127 128 /* 129 * Return the number of days in the given Indian year 130 * 131 * @param eyear The year in Saka Era. 132 */ 133 int32_t IndianCalendar::handleGetYearLength(int32_t eyear) const { 134 return isGregorianLeap(eyear + INDIAN_ERA_START) ? 366 : 365; 135 } 136 /* 137 * Returns the Julian Day corresponding to gregorian date 138 * 139 * @param year The Gregorian year 140 * @param month The month in Gregorian Year 141 * @param date The date in Gregorian day in month 142 */ 143 static double gregorianToJD(int32_t year, int32_t month, int32_t date) { 144 double julianDay = (JULIAN_EPOCH - 1) + 145 (365 * (year - 1)) + 146 uprv_floor((year - 1) / 4) + 147 (-uprv_floor((year - 1) / 100)) + 148 uprv_floor((year - 1) / 400) + 149 uprv_floor((((367 * month) - 362) / 12) + 150 ((month <= 2) ? 0 : 151 (isGregorianLeap(year) ? -1 : -2) 152 ) + 153 date); 154 155 return julianDay; 156 } 157 158 /* 159 * Returns the Gregorian Date corresponding to a given Julian Day 160 * @param jd The Julian Day 161 */ 162 static int32_t* jdToGregorian(double jd, int32_t gregorianDate[3]) { 163 double wjd, depoch, quadricent, dqc, cent, dcent, quad, dquad, yindex, yearday, leapadj; 164 int32_t year, month, day; 165 wjd = uprv_floor(jd - 0.5) + 0.5; 166 depoch = wjd - JULIAN_EPOCH; 167 quadricent = uprv_floor(depoch / 146097); 168 dqc = (int32_t)uprv_floor(depoch) % 146097; 169 cent = uprv_floor(dqc / 36524); 170 dcent = (int32_t)uprv_floor(dqc) % 36524; 171 quad = uprv_floor(dcent / 1461); 172 dquad = (int32_t)uprv_floor(dcent) % 1461; 173 yindex = uprv_floor(dquad / 365); 174 year = (int32_t)((quadricent * 400) + (cent * 100) + (quad * 4) + yindex); 175 if (!((cent == 4) || (yindex == 4))) { 176 year++; 177 } 178 yearday = wjd - gregorianToJD(year, 1, 1); 179 leapadj = ((wjd < gregorianToJD(year, 3, 1)) ? 0 180 : 181 (isGregorianLeap(year) ? 1 : 2) 182 ); 183 month = (int32_t)uprv_floor((((yearday + leapadj) * 12) + 373) / 367); 184 day = (int32_t)(wjd - gregorianToJD(year, month, 1)) + 1; 185 186 gregorianDate[0] = year; 187 gregorianDate[1] = month; 188 gregorianDate[2] = day; 189 190 return gregorianDate; 191 } 192 193 194 //------------------------------------------------------------------------- 195 // Functions for converting from field values to milliseconds.... 196 //------------------------------------------------------------------------- 197 static double IndianToJD(int32_t year, int32_t month, int32_t date) { 198 int32_t leapMonth, gyear, m; 199 double start, jd; 200 201 gyear = year + INDIAN_ERA_START; 202 203 204 if(isGregorianLeap(gyear)) { 205 leapMonth = 31; 206 start = gregorianToJD(gyear, 3, 21); 207 } 208 else { 209 leapMonth = 30; 210 start = gregorianToJD(gyear, 3, 22); 211 } 212 213 if (month == 1) { 214 jd = start + (date - 1); 215 } else { 216 jd = start + leapMonth; 217 m = month - 2; 218 219 //m = Math.min(m, 5); 220 if (m > 5) { 221 m = 5; 222 } 223 224 jd += m * 31; 225 226 if (month >= 8) { 227 m = month - 7; 228 jd += m * 30; 229 } 230 jd += date - 1; 231 } 232 233 return jd; 234 } 235 236 /* 237 * Return JD of start of given month/year of Indian Calendar 238 * @param eyear The year in Indian Calendar measured from Saka Era (78 AD). 239 * @param month The month in Indian calendar 240 */ 241 int32_t IndianCalendar::handleComputeMonthStart(int32_t eyear, int32_t month, UBool /* useMonth */ ) const { 242 243 //month is 0 based; converting it to 1-based 244 int32_t imonth; 245 246 // If the month is out of range, adjust it into range, and adjust the extended eyar accordingly 247 if (month < 0 || month > 11) { 248 eyear += (int32_t)ClockMath::floorDivide(month, 12, month); 249 } 250 251 if(month == 12){ 252 imonth = 1; 253 } else { 254 imonth = month + 1; 255 } 256 257 double jd = IndianToJD(eyear ,imonth, 1); 258 259 return (int32_t)jd; 260 } 261 262 //------------------------------------------------------------------------- 263 // Functions for converting from milliseconds to field values 264 //------------------------------------------------------------------------- 265 266 int32_t IndianCalendar::handleGetExtendedYear() { 267 int32_t year; 268 269 if (newerField(UCAL_EXTENDED_YEAR, UCAL_YEAR) == UCAL_EXTENDED_YEAR) { 270 year = internalGet(UCAL_EXTENDED_YEAR, 1); // Default to year 1 271 } else { 272 year = internalGet(UCAL_YEAR, 1); // Default to year 1 273 } 274 275 return year; 276 } 277 278 /* 279 * Override Calendar to compute several fields specific to the Indian 280 * calendar system. These are: 281 * 282 * <ul><li>ERA 283 * <li>YEAR 284 * <li>MONTH 285 * <li>DAY_OF_MONTH 286 * <li>EXTENDED_YEAR</ul> 287 * 288 * The DAY_OF_WEEK and DOW_LOCAL fields are already set when this 289 * method is called. The getGregorianXxx() methods return Gregorian 290 * calendar equivalents for the given Julian day. 291 */ 292 void IndianCalendar::handleComputeFields(int32_t julianDay, UErrorCode& /* status */) { 293 double jdAtStartOfGregYear; 294 int32_t leapMonth, IndianYear, yday, IndianMonth, IndianDayOfMonth, mday; 295 int32_t gregorianYear; // Stores gregorian date corresponding to Julian day; 296 int32_t gd[3]; 297 298 gregorianYear = jdToGregorian(julianDay, gd)[0]; // Gregorian date for Julian day 299 IndianYear = gregorianYear - INDIAN_ERA_START; // Year in Saka era 300 jdAtStartOfGregYear = gregorianToJD(gregorianYear, 1, 1); // JD at start of Gregorian year 301 yday = (int32_t)(julianDay - jdAtStartOfGregYear); // Day number in Gregorian year (starting from 0) 302 303 if (yday < INDIAN_YEAR_START) { 304 // Day is at the end of the preceding Saka year 305 IndianYear -= 1; 306 leapMonth = isGregorianLeap(gregorianYear - 1) ? 31 : 30; // Days in leapMonth this year, previous Gregorian year 307 yday += leapMonth + (31 * 5) + (30 * 3) + 10; 308 } else { 309 leapMonth = isGregorianLeap(gregorianYear) ? 31 : 30; // Days in leapMonth this year 310 yday -= INDIAN_YEAR_START; 311 } 312 313 if (yday < leapMonth) { 314 IndianMonth = 0; 315 IndianDayOfMonth = yday + 1; 316 } else { 317 mday = yday - leapMonth; 318 if (mday < (31 * 5)) { 319 IndianMonth = (int32_t)uprv_floor(mday / 31) + 1; 320 IndianDayOfMonth = (mday % 31) + 1; 321 } else { 322 mday -= 31 * 5; 323 IndianMonth = (int32_t)uprv_floor(mday / 30) + 6; 324 IndianDayOfMonth = (mday % 30) + 1; 325 } 326 } 327 328 internalSet(UCAL_ERA, 0); 329 internalSet(UCAL_EXTENDED_YEAR, IndianYear); 330 internalSet(UCAL_YEAR, IndianYear); 331 internalSet(UCAL_MONTH, IndianMonth); 332 internalSet(UCAL_DAY_OF_MONTH, IndianDayOfMonth); 333 internalSet(UCAL_DAY_OF_YEAR, yday + 1); // yday is 0-based 334 } 335 336 UBool 337 IndianCalendar::inDaylightTime(UErrorCode& status) const 338 { 339 // copied from GregorianCalendar 340 if (U_FAILURE(status) || !getTimeZone().useDaylightTime()) { 341 return FALSE; 342 } 343 344 // Force an update of the state of the Calendar. 345 ((IndianCalendar*)this)->complete(status); // cast away const 346 347 return (UBool)(U_SUCCESS(status) ? (internalGet(UCAL_DST_OFFSET) != 0) : FALSE); 348 } 349 350 // default century 351 const UDate IndianCalendar::fgSystemDefaultCentury = DBL_MIN; 352 const int32_t IndianCalendar::fgSystemDefaultCenturyYear = -1; 353 354 UDate IndianCalendar::fgSystemDefaultCenturyStart = DBL_MIN; 355 int32_t IndianCalendar::fgSystemDefaultCenturyStartYear = -1; 356 357 358 UBool IndianCalendar::haveDefaultCentury() const 359 { 360 return TRUE; 361 } 362 363 UDate IndianCalendar::defaultCenturyStart() const 364 { 365 return internalGetDefaultCenturyStart(); 366 } 367 368 int32_t IndianCalendar::defaultCenturyStartYear() const 369 { 370 return internalGetDefaultCenturyStartYear(); 371 } 372 373 UDate 374 IndianCalendar::internalGetDefaultCenturyStart() const 375 { 376 // lazy-evaluate systemDefaultCenturyStart 377 UBool needsUpdate; 378 { 379 Mutex m; 380 needsUpdate = (fgSystemDefaultCenturyStart == fgSystemDefaultCentury); 381 } 382 383 if (needsUpdate) { 384 initializeSystemDefaultCentury(); 385 } 386 387 // use defaultCenturyStart unless it's the flag value; 388 // then use systemDefaultCenturyStart 389 390 return fgSystemDefaultCenturyStart; 391 } 392 393 int32_t 394 IndianCalendar::internalGetDefaultCenturyStartYear() const 395 { 396 // lazy-evaluate systemDefaultCenturyStartYear 397 UBool needsUpdate; 398 { 399 Mutex m; 400 401 needsUpdate = (fgSystemDefaultCenturyStart == fgSystemDefaultCentury); 402 } 403 404 if (needsUpdate) { 405 initializeSystemDefaultCentury(); 406 } 407 408 // use defaultCenturyStart unless it's the flag value; 409 // then use systemDefaultCenturyStartYear 410 411 return fgSystemDefaultCenturyStartYear; 412 } 413 414 void 415 IndianCalendar::initializeSystemDefaultCentury() 416 { 417 // initialize systemDefaultCentury and systemDefaultCenturyYear based 418 // on the current time. They'll be set to 80 years before 419 // the current time. 420 // No point in locking as it should be idempotent. 421 if (fgSystemDefaultCenturyStart == fgSystemDefaultCentury) { 422 UErrorCode status = U_ZERO_ERROR; 423 424 IndianCalendar calendar(Locale("@calendar=Indian"),status); 425 if (U_SUCCESS(status)) { 426 calendar.setTime(Calendar::getNow(), status); 427 calendar.add(UCAL_YEAR, -80, status); 428 429 UDate newStart = calendar.getTime(status); 430 int32_t newYear = calendar.get(UCAL_YEAR, status); 431 432 { 433 Mutex m; 434 435 fgSystemDefaultCenturyStart = newStart; 436 fgSystemDefaultCenturyStartYear = newYear; 437 } 438 } 439 440 // We have no recourse upon failure unless we want to propagate the failure 441 // out. 442 } 443 } 444 445 UOBJECT_DEFINE_RTTI_IMPLEMENTATION(IndianCalendar) 446 447 U_NAMESPACE_END 448 449 #endif 450 451
