1// © 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
29U_NAMESPACE_BEGIN
30
31// Implementation of the IndianCalendar class
32
33//-------------------------------------------------------------------------
34// Constructors...
35//-------------------------------------------------------------------------
36
37
38IndianCalendar* IndianCalendar::clone() const {
39 return new IndianCalendar(*this);
40}
41
42IndianCalendar::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
48IndianCalendar::IndianCalendar(const IndianCalendar& other) : Calendar(other) {
49}
50
51IndianCalendar::~IndianCalendar()
52{
53}
54const char *IndianCalendar::getType() const {
55 return "indian";
56}
57
58static 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
86static const double JULIAN_EPOCH = 1721425.5;
87static const int32_t INDIAN_ERA_START = 78;
88static const int32_t INDIAN_YEAR_START = 80;
89
90int32_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 */
97static 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 */
112int32_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 */
133int32_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 */
143static 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 */
162static 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//-------------------------------------------------------------------------
197static 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 */
241int32_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
266int32_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 */
292void 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
336UBool
337IndianCalendar::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
351/**
352 * The system maintains a static default century start date and Year. They are
353 * initialized the first time they are used. Once the system default century date
354 * and year are set, they do not change.
355 */
356static UDate gSystemDefaultCenturyStart = DBL_MIN;
357static int32_t gSystemDefaultCenturyStartYear = -1;
358static icu::UInitOnce gSystemDefaultCenturyInit = U_INITONCE_INITIALIZER;
359
360
361UBool IndianCalendar::haveDefaultCentury() const
362{
363 return TRUE;
364}
365
366static void U_CALLCONV
367initializeSystemDefaultCentury()
368{
369 // initialize systemDefaultCentury and systemDefaultCenturyYear based
370 // on the current time. They'll be set to 80 years before
371 // the current time.
372 UErrorCode status = U_ZERO_ERROR;
373
374 IndianCalendar calendar ( Locale ( "@calendar=Indian" ), status);
375 if ( U_SUCCESS ( status ) ) {
376 calendar.setTime ( Calendar::getNow(), status );
377 calendar.add ( UCAL_YEAR, -80, status );
378
379 UDate newStart = calendar.getTime ( status );
380 int32_t newYear = calendar.get ( UCAL_YEAR, status );
381
382 gSystemDefaultCenturyStart = newStart;
383 gSystemDefaultCenturyStartYear = newYear;
384 }
385 // We have no recourse upon failure.
386}
387
388
389UDate
390IndianCalendar::defaultCenturyStart() const
391{
392 // lazy-evaluate systemDefaultCenturyStart
393 umtx_initOnce(gSystemDefaultCenturyInit, &initializeSystemDefaultCentury);
394 return gSystemDefaultCenturyStart;
395}
396
397int32_t
398IndianCalendar::defaultCenturyStartYear() const
399{
400 // lazy-evaluate systemDefaultCenturyStartYear
401 umtx_initOnce(gSystemDefaultCenturyInit, &initializeSystemDefaultCentury);
402 return gSystemDefaultCenturyStartYear;
403}
404
405
406UOBJECT_DEFINE_RTTI_IMPLEMENTATION(IndianCalendar)
407
408U_NAMESPACE_END
409
410#endif
411
412