1 /*
2 * Copyright (C) 2003-2007, 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 #include "ucln_in.h"
20
21 // Debugging
22 #ifdef U_DEBUG_INDIANCAL
23 #include <stdio.h>
24 #include <stdarg.h>
25
26 #endif
27
28 U_NAMESPACE_BEGIN
29
30 // Implementation of the IndianCalendar class
31
32 //-------------------------------------------------------------------------
33 // Constructors...
34 //-------------------------------------------------------------------------
35
36
clone() const37 Calendar* IndianCalendar::clone() const {
38 return new IndianCalendar(*this);
39 }
40
IndianCalendar(const Locale & aLocale,UErrorCode & success)41 IndianCalendar::IndianCalendar(const Locale& aLocale, UErrorCode& success)
42 : Calendar(TimeZone::createDefault(), aLocale, success)
43 {
44 setTimeInMillis(getNow(), success); // Call this again now that the vtable is set up properly.
45 }
46
IndianCalendar(const IndianCalendar & other)47 IndianCalendar::IndianCalendar(const IndianCalendar& other) : Calendar(other) {
48 }
49
~IndianCalendar()50 IndianCalendar::~IndianCalendar()
51 {
52 }
getType() const53 const char *IndianCalendar::getType() const {
54 return "indian";
55 }
56
57 static const int32_t LIMITS[UCAL_FIELD_COUNT][4] = {
58 // Minimum Greatest Least Maximum
59 // Minimum Maximum
60 { 0, 0, 0, 0 }, // ERA
61 { 1, 1, 5000000, 5000000 }, // YEAR
62 { 0, 0, 11, 11 }, // MONTH
63 { 1, 1, 52, 53 }, // WEEK_OF_YEAR
64 { 0, 0, 4, 6 }, // WEEK_OF_MONTH
65 { 1, 1, 30, 31 }, // DAY_OF_MONTH
66 { 1, 1, 365, 366 }, // DAY_OF_YEAR
67 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // DAY_OF_WEEK
68 { -1, -1, 5, 5 }, // DAY_OF_WEEK_IN_MONTH
69 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // AM_PM
70 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // HOUR
71 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // HOUR_OF_DAY
72 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // MINUTE
73 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // SECOND
74 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // MILLISECOND
75 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // ZONE_OFFSET
76 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // DST_OFFSET
77 { 1, 1, 5000001, 5000001}, // YEAR_WOY
78 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // DOW_LOCAL
79 { 1, 1, 5000000, 5000000}, // EXTENDED_YEAR
80 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // JULIAN_DAY
81 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1} // MILLISECONDS_IN_DAY
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
handleGetLimit(UCalendarDateFields field,ELimitType limitType) const88 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 */
isGregorianLeap(int32_t year)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 */
handleGetMonthLength(int32_t eyear,int32_t month) const110 int32_t IndianCalendar::handleGetMonthLength(int32_t eyear, int32_t month) const {
111 if (month < 0 || month > 11) {
112 eyear += Math::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 */
handleGetYearLength(int32_t eyear) const131 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 */
gregorianToJD(int32_t year,int32_t month,int32_t date)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 */
jdToGregorian(double jd,int32_t gregorianDate[3])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 //-------------------------------------------------------------------------
IndianToJD(int32_t year,int32_t month,int32_t date)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 */
handleComputeMonthStart(int32_t eyear,int32_t month,UBool useMonth) const239 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)Math::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
handleGetExtendedYear()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 */
handleComputeFields(int32_t julianDay,UErrorCode & status)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 leapMonth = isGregorianLeap(gregorianYear) ? 31 : 30; // Days in leapMonth this year
301
302 if (yday < INDIAN_YEAR_START) {
303 // Day is at the end of the preceding Saka year
304 IndianYear -= 1;
305 yday += leapMonth + (31 * 5) + (30 * 3) + 10 + INDIAN_YEAR_START;
306 }
307
308 yday -= INDIAN_YEAR_START;
309 if (yday < leapMonth) {
310 IndianMonth = 0;
311 IndianDayOfMonth = yday + 1;
312 } else {
313 mday = yday - leapMonth;
314 if (mday < (31 * 5)) {
315 IndianMonth = (int32_t)uprv_floor(mday / 31) + 1;
316 IndianDayOfMonth = (mday % 31) + 1;
317 } else {
318 mday -= 31 * 5;
319 IndianMonth = (int32_t)uprv_floor(mday / 30) + 6;
320 IndianDayOfMonth = (mday % 30) + 1;
321 }
322 }
323
324 internalSet(UCAL_ERA, 0);
325 internalSet(UCAL_EXTENDED_YEAR, IndianYear);
326 internalSet(UCAL_YEAR, IndianYear);
327 internalSet(UCAL_MONTH, IndianMonth);
328 internalSet(UCAL_DAY_OF_MONTH, IndianDayOfMonth );
329 }
330
331 UBool
inDaylightTime(UErrorCode & status) const332 IndianCalendar::inDaylightTime(UErrorCode& status) const
333 {
334 // copied from GregorianCalendar
335 if (U_FAILURE(status) || !getTimeZone().useDaylightTime()) {
336 return FALSE;
337 }
338
339 // Force an update of the state of the Calendar.
340 ((IndianCalendar*)this)->complete(status); // cast away const
341
342 return (UBool)(U_SUCCESS(status) ? (internalGet(UCAL_DST_OFFSET) != 0) : FALSE);
343 }
344
345 // default century
346 const UDate IndianCalendar::fgSystemDefaultCentury = DBL_MIN;
347 const int32_t IndianCalendar::fgSystemDefaultCenturyYear = -1;
348
349 UDate IndianCalendar::fgSystemDefaultCenturyStart = DBL_MIN;
350 int32_t IndianCalendar::fgSystemDefaultCenturyStartYear = -1;
351
352
haveDefaultCentury() const353 UBool IndianCalendar::haveDefaultCentury() const
354 {
355 return TRUE;
356 }
357
defaultCenturyStart() const358 UDate IndianCalendar::defaultCenturyStart() const
359 {
360 return internalGetDefaultCenturyStart();
361 }
362
defaultCenturyStartYear() const363 int32_t IndianCalendar::defaultCenturyStartYear() const
364 {
365 return internalGetDefaultCenturyStartYear();
366 }
367
368 UDate
internalGetDefaultCenturyStart() const369 IndianCalendar::internalGetDefaultCenturyStart() const
370 {
371 // lazy-evaluate systemDefaultCenturyStart
372 UBool needsUpdate;
373 {
374 Mutex m;
375 needsUpdate = (fgSystemDefaultCenturyStart == fgSystemDefaultCentury);
376 }
377
378 if (needsUpdate) {
379 initializeSystemDefaultCentury();
380 }
381
382 // use defaultCenturyStart unless it's the flag value;
383 // then use systemDefaultCenturyStart
384
385 return fgSystemDefaultCenturyStart;
386 }
387
388 int32_t
internalGetDefaultCenturyStartYear() const389 IndianCalendar::internalGetDefaultCenturyStartYear() const
390 {
391 // lazy-evaluate systemDefaultCenturyStartYear
392 UBool needsUpdate;
393 {
394 Mutex m;
395
396 needsUpdate = (fgSystemDefaultCenturyStart == fgSystemDefaultCentury);
397 }
398
399 if (needsUpdate) {
400 initializeSystemDefaultCentury();
401 }
402
403 // use defaultCenturyStart unless it's the flag value;
404 // then use systemDefaultCenturyStartYear
405
406 return fgSystemDefaultCenturyStartYear;
407 }
408
409 void
initializeSystemDefaultCentury()410 IndianCalendar::initializeSystemDefaultCentury()
411 {
412 // initialize systemDefaultCentury and systemDefaultCenturyYear based
413 // on the current time. They'll be set to 80 years before
414 // the current time.
415 // No point in locking as it should be idempotent.
416 if (fgSystemDefaultCenturyStart == fgSystemDefaultCentury) {
417 UErrorCode status = U_ZERO_ERROR;
418
419 IndianCalendar calendar(Locale("@calendar=Indian"),status);
420 if (U_SUCCESS(status)) {
421 calendar.setTime(Calendar::getNow(), status);
422 calendar.add(UCAL_YEAR, -80, status);
423
424 UDate newStart = calendar.getTime(status);
425 int32_t newYear = calendar.get(UCAL_YEAR, status);
426
427 {
428 Mutex m;
429
430 fgSystemDefaultCenturyStart = newStart;
431 fgSystemDefaultCenturyStartYear = newYear;
432 }
433 }
434
435 // We have no recourse upon failure unless we want to propagate the failure
436 // out.
437 }
438 }
439
440 UOBJECT_DEFINE_RTTI_IMPLEMENTATION(IndianCalendar)
441
442 U_NAMESPACE_END
443
444 #endif
445
446