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comparison: intl/icu/source/i18n/indiancal.cpp

intl/icu/source/i18n/indiancal.cpp

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1 /*
2 * Copyright (C) 2003-2009, 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
37 Calendar* IndianCalendar::clone() const {
38 return new IndianCalendar(*this);
39 }
40
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
47 IndianCalendar::IndianCalendar(const IndianCalendar& other) : Calendar(other) {
48 }
49
50 IndianCalendar::~IndianCalendar()
51 {
52 }
53 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 { -5000000, -5000000, 5000000, 5000000}, // YEAR
62 { 0, 0, 11, 11}, // MONTH
63 { 1, 1, 52, 53}, // WEEK_OF_YEAR
64 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // 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 { -5000000, -5000000, 5000000, 5000000}, // YEAR_WOY
78 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // DOW_LOCAL
79 { -5000000, -5000000, 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 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // IS_LEAP_MONTH
83 };
84
85 static const double JULIAN_EPOCH = 1721425.5;
86 static const int32_t INDIAN_ERA_START = 78;
87 static const int32_t INDIAN_YEAR_START = 80;
88
89 int32_t IndianCalendar::handleGetLimit(UCalendarDateFields field, ELimitType limitType) const {
90 return LIMITS[field][limitType];
91 }
92
93 /*
94 * Determine whether the given gregorian year is a Leap year
95 */
96 static UBool isGregorianLeap(int32_t year)
97 {
98 return ((year % 4) == 0) && (!(((year % 100) == 0) && ((year % 400) != 0)));
99 }
100
101 //----------------------------------------------------------------------
102 // Calendar framework
103 //----------------------------------------------------------------------
104
105 /*
106 * Return the length (in days) of the given month.
107 *
108 * @param eyear The year in Saka Era
109 * @param month The month(0-based) in Indian calendar
110 */
111 int32_t IndianCalendar::handleGetMonthLength(int32_t eyear, int32_t month) const {
112 if (month < 0 || month > 11) {
113 eyear += ClockMath::floorDivide(month, 12, month);
114 }
115
116 if (isGregorianLeap(eyear + INDIAN_ERA_START) && month == 0) {
117 return 31;
118 }
119
120 if (month >= 1 && month <= 5) {
121 return 31;
122 }
123
124 return 30;
125 }
126
127 /*
128 * Return the number of days in the given Indian year
129 *
130 * @param eyear The year in Saka Era.
131 */
132 int32_t IndianCalendar::handleGetYearLength(int32_t eyear) const {
133 return isGregorianLeap(eyear + INDIAN_ERA_START) ? 366 : 365;
134 }
135 /*
136 * Returns the Julian Day corresponding to gregorian date
137 *
138 * @param year The Gregorian year
139 * @param month The month in Gregorian Year
140 * @param date The date in Gregorian day in month
141 */
142 static double gregorianToJD(int32_t year, int32_t month, int32_t date) {
143 double julianDay = (JULIAN_EPOCH - 1) +
144 (365 * (year - 1)) +
145 uprv_floor((year - 1) / 4) +
146 (-uprv_floor((year - 1) / 100)) +
147 uprv_floor((year - 1) / 400) +
148 uprv_floor((((367 * month) - 362) / 12) +
149 ((month <= 2) ? 0 :
150 (isGregorianLeap(year) ? -1 : -2)
151 ) +
152 date);
153
154 return julianDay;
155 }
156
157 /*
158 * Returns the Gregorian Date corresponding to a given Julian Day
159 * @param jd The Julian Day
160 */
161 static int32_t* jdToGregorian(double jd, int32_t gregorianDate[3]) {
162 double wjd, depoch, quadricent, dqc, cent, dcent, quad, dquad, yindex, yearday, leapadj;
163 int32_t year, month, day;
164 wjd = uprv_floor(jd - 0.5) + 0.5;
165 depoch = wjd - JULIAN_EPOCH;
166 quadricent = uprv_floor(depoch / 146097);
167 dqc = (int32_t)uprv_floor(depoch) % 146097;
168 cent = uprv_floor(dqc / 36524);
169 dcent = (int32_t)uprv_floor(dqc) % 36524;
170 quad = uprv_floor(dcent / 1461);
171 dquad = (int32_t)uprv_floor(dcent) % 1461;
172 yindex = uprv_floor(dquad / 365);
173 year = (int32_t)((quadricent * 400) + (cent * 100) + (quad * 4) + yindex);
174 if (!((cent == 4) || (yindex == 4))) {
175 year++;
176 }
177 yearday = wjd - gregorianToJD(year, 1, 1);
178 leapadj = ((wjd < gregorianToJD(year, 3, 1)) ? 0
179 :
180 (isGregorianLeap(year) ? 1 : 2)
181 );
182 month = (int32_t)uprv_floor((((yearday + leapadj) * 12) + 373) / 367);
183 day = (int32_t)(wjd - gregorianToJD(year, month, 1)) + 1;
184
185 gregorianDate[0] = year;
186 gregorianDate[1] = month;
187 gregorianDate[2] = day;
188
189 return gregorianDate;
190 }
191
192
193 //-------------------------------------------------------------------------
194 // Functions for converting from field values to milliseconds....
195 //-------------------------------------------------------------------------
196 static double IndianToJD(int32_t year, int32_t month, int32_t date) {
197 int32_t leapMonth, gyear, m;
198 double start, jd;
199
200 gyear = year + INDIAN_ERA_START;
201
202
203 if(isGregorianLeap(gyear)) {
204 leapMonth = 31;
205 start = gregorianToJD(gyear, 3, 21);
206 }
207 else {
208 leapMonth = 30;
209 start = gregorianToJD(gyear, 3, 22);
210 }
211
212 if (month == 1) {
213 jd = start + (date - 1);
214 } else {
215 jd = start + leapMonth;
216 m = month - 2;
217
218 //m = Math.min(m, 5);
219 if (m > 5) {
220 m = 5;
221 }
222
223 jd += m * 31;
224
225 if (month >= 8) {
226 m = month - 7;
227 jd += m * 30;
228 }
229 jd += date - 1;
230 }
231
232 return jd;
233 }
234
235 /*
236 * Return JD of start of given month/year of Indian Calendar
237 * @param eyear The year in Indian Calendar measured from Saka Era (78 AD).
238 * @param month The month in Indian calendar
239 */
240 int32_t IndianCalendar::handleComputeMonthStart(int32_t eyear, int32_t month, UBool /* useMonth */ ) const {
241
242 //month is 0 based; converting it to 1-based
243 int32_t imonth;
244
245 // If the month is out of range, adjust it into range, and adjust the extended eyar accordingly
246 if (month < 0 || month > 11) {
247 eyear += (int32_t)ClockMath::floorDivide(month, 12, month);
248 }
249
250 if(month == 12){
251 imonth = 1;
252 } else {
253 imonth = month + 1;
254 }
255
256 double jd = IndianToJD(eyear ,imonth, 1);
257
258 return (int32_t)jd;
259 }
260
261 //-------------------------------------------------------------------------
262 // Functions for converting from milliseconds to field values
263 //-------------------------------------------------------------------------
264
265 int32_t IndianCalendar::handleGetExtendedYear() {
266 int32_t year;
267
268 if (newerField(UCAL_EXTENDED_YEAR, UCAL_YEAR) == UCAL_EXTENDED_YEAR) {
269 year = internalGet(UCAL_EXTENDED_YEAR, 1); // Default to year 1
270 } else {
271 year = internalGet(UCAL_YEAR, 1); // Default to year 1
272 }
273
274 return year;
275 }
276
277 /*
278 * Override Calendar to compute several fields specific to the Indian
279 * calendar system. These are:
280 *
281 * <ul><li>ERA
282 * <li>YEAR
283 * <li>MONTH
284 * <li>DAY_OF_MONTH
285 * <li>EXTENDED_YEAR</ul>
286 *
287 * The DAY_OF_WEEK and DOW_LOCAL fields are already set when this
288 * method is called. The getGregorianXxx() methods return Gregorian
289 * calendar equivalents for the given Julian day.
290 */
291 void IndianCalendar::handleComputeFields(int32_t julianDay, UErrorCode& /* status */) {
292 double jdAtStartOfGregYear;
293 int32_t leapMonth, IndianYear, yday, IndianMonth, IndianDayOfMonth, mday;
294 int32_t gregorianYear; // Stores gregorian date corresponding to Julian day;
295 int32_t gd[3];
296
297 gregorianYear = jdToGregorian(julianDay, gd)[0]; // Gregorian date for Julian day
298 IndianYear = gregorianYear - INDIAN_ERA_START; // Year in Saka era
299 jdAtStartOfGregYear = gregorianToJD(gregorianYear, 1, 1); // JD at start of Gregorian year
300 yday = (int32_t)(julianDay - jdAtStartOfGregYear); // Day number in Gregorian year (starting from 0)
301
302 if (yday < INDIAN_YEAR_START) {
303 // Day is at the end of the preceding Saka year
304 IndianYear -= 1;
305 leapMonth = isGregorianLeap(gregorianYear - 1) ? 31 : 30; // Days in leapMonth this year, previous Gregorian year
306 yday += leapMonth + (31 * 5) + (30 * 3) + 10;
307 } else {
308 leapMonth = isGregorianLeap(gregorianYear) ? 31 : 30; // Days in leapMonth this year
309 yday -= INDIAN_YEAR_START;
310 }
311
312 if (yday < leapMonth) {
313 IndianMonth = 0;
314 IndianDayOfMonth = yday + 1;
315 } else {
316 mday = yday - leapMonth;
317 if (mday < (31 * 5)) {
318 IndianMonth = (int32_t)uprv_floor(mday / 31) + 1;
319 IndianDayOfMonth = (mday % 31) + 1;
320 } else {
321 mday -= 31 * 5;
322 IndianMonth = (int32_t)uprv_floor(mday / 30) + 6;
323 IndianDayOfMonth = (mday % 30) + 1;
324 }
325 }
326
327 internalSet(UCAL_ERA, 0);
328 internalSet(UCAL_EXTENDED_YEAR, IndianYear);
329 internalSet(UCAL_YEAR, IndianYear);
330 internalSet(UCAL_MONTH, IndianMonth);
331 internalSet(UCAL_DAY_OF_MONTH, IndianDayOfMonth);
332 internalSet(UCAL_DAY_OF_YEAR, yday + 1); // yday is 0-based
333 }
334
335 UBool
336 IndianCalendar::inDaylightTime(UErrorCode& status) const
337 {
338 // copied from GregorianCalendar
339 if (U_FAILURE(status) || !getTimeZone().useDaylightTime()) {
340 return FALSE;
341 }
342
343 // Force an update of the state of the Calendar.
344 ((IndianCalendar*)this)->complete(status); // cast away const
345
346 return (UBool)(U_SUCCESS(status) ? (internalGet(UCAL_DST_OFFSET) != 0) : FALSE);
347 }
348
349 // default century
350 const UDate IndianCalendar::fgSystemDefaultCentury = DBL_MIN;
351 const int32_t IndianCalendar::fgSystemDefaultCenturyYear = -1;
352
353 UDate IndianCalendar::fgSystemDefaultCenturyStart = DBL_MIN;
354 int32_t IndianCalendar::fgSystemDefaultCenturyStartYear = -1;
355
356
357 UBool IndianCalendar::haveDefaultCentury() const
358 {
359 return TRUE;
360 }
361
362 UDate IndianCalendar::defaultCenturyStart() const
363 {
364 return internalGetDefaultCenturyStart();
365 }
366
367 int32_t IndianCalendar::defaultCenturyStartYear() const
368 {
369 return internalGetDefaultCenturyStartYear();
370 }
371
372 UDate
373 IndianCalendar::internalGetDefaultCenturyStart() const
374 {
375 // lazy-evaluate systemDefaultCenturyStart
376 UBool needsUpdate;
377 {
378 Mutex m;
379 needsUpdate = (fgSystemDefaultCenturyStart == fgSystemDefaultCentury);
380 }
381
382 if (needsUpdate) {
383 initializeSystemDefaultCentury();
384 }
385
386 // use defaultCenturyStart unless it's the flag value;
387 // then use systemDefaultCenturyStart
388
389 return fgSystemDefaultCenturyStart;
390 }
391
392 int32_t
393 IndianCalendar::internalGetDefaultCenturyStartYear() const
394 {
395 // lazy-evaluate systemDefaultCenturyStartYear
396 UBool needsUpdate;
397 {
398 Mutex m;
399
400 needsUpdate = (fgSystemDefaultCenturyStart == fgSystemDefaultCentury);
401 }
402
403 if (needsUpdate) {
404 initializeSystemDefaultCentury();
405 }
406
407 // use defaultCenturyStart unless it's the flag value;
408 // then use systemDefaultCenturyStartYear
409
410 return fgSystemDefaultCenturyStartYear;
411 }
412
413 void
414 IndianCalendar::initializeSystemDefaultCentury()
415 {
416 // initialize systemDefaultCentury and systemDefaultCenturyYear based
417 // on the current time. They'll be set to 80 years before
418 // the current time.
419 // No point in locking as it should be idempotent.
420 if (fgSystemDefaultCenturyStart == fgSystemDefaultCentury) {
421 UErrorCode status = U_ZERO_ERROR;
422
423 IndianCalendar calendar(Locale("@calendar=Indian"),status);
424 if (U_SUCCESS(status)) {
425 calendar.setTime(Calendar::getNow(), status);
426 calendar.add(UCAL_YEAR, -80, status);
427
428 UDate newStart = calendar.getTime(status);
429 int32_t newYear = calendar.get(UCAL_YEAR, status);
430
431 {
432 Mutex m;
433
434 fgSystemDefaultCenturyStart = newStart;
435 fgSystemDefaultCenturyStartYear = newYear;
436 }
437 }
438
439 // We have no recourse upon failure unless we want to propagate the failure
440 // out.
441 }
442 }
443
444 UOBJECT_DEFINE_RTTI_IMPLEMENTATION(IndianCalendar)
445
446 U_NAMESPACE_END
447
448 #endif
449

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