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