[apple/icu.git] / icuSources / i18n / indiancal.cpp

// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
/*
 * Copyright (C) 2003-2014, International Business Machines Corporation
 * and others. All Rights Reserved.
 ******************************************************************************
 *
 * File INDIANCAL.CPP
 *****************************************************************************
 */

#include "indiancal.h"
#include <stdlib.h>
#if !UCONFIG_NO_FORMATTING

#include "mutex.h"
#include <float.h>
#include "gregoimp.h" // Math
#include "astro.h" // CalendarAstronomer
#include "uhash.h"

// Debugging
#ifdef U_DEBUG_INDIANCAL
#include <stdio.h>
#include <stdarg.h>

#endif

U_NAMESPACE_BEGIN

// Implementation of the IndianCalendar class

//-------------------------------------------------------------------------
// Constructors...
//-------------------------------------------------------------------------


Calendar* IndianCalendar::clone() const {
  return new IndianCalendar(*this);
}

IndianCalendar::IndianCalendar(const Locale& aLocale, UErrorCode& success)
  :   Calendar(TimeZone::createDefault(), aLocale, success)
{
  setTimeInMillis(getNow(), success); // Call this again now that the vtable is set up properly.
}

IndianCalendar::IndianCalendar(const IndianCalendar& other) : Calendar(other) {
}

IndianCalendar::~IndianCalendar()
{
}
const char *IndianCalendar::getType() const { 
   return "indian";
}
  
static const int32_t LIMITS[UCAL_FIELD_COUNT][4] = {
    // Minimum  Greatest     Least   Maximum
    //           Minimum   Maximum
    {        0,        0,        0,        0}, // ERA
    { -5000000, -5000000,  5000000,  5000000}, // YEAR
    {        0,        0,       11,       11}, // MONTH
    {        1,        1,       52,       53}, // WEEK_OF_YEAR
    {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // WEEK_OF_MONTH
    {        1,        1,       30,       31}, // DAY_OF_MONTH
    {        1,        1,      365,      366}, // DAY_OF_YEAR
    {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // DAY_OF_WEEK
    {       -1,       -1,        5,        5}, // DAY_OF_WEEK_IN_MONTH
    {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // AM_PM
    {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // HOUR
    {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // HOUR_OF_DAY
    {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // MINUTE
    {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // SECOND
    {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // MILLISECOND
    {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // ZONE_OFFSET
    {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // DST_OFFSET
    { -5000000, -5000000,  5000000,  5000000}, // YEAR_WOY
    {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // DOW_LOCAL
    { -5000000, -5000000,  5000000,  5000000}, // EXTENDED_YEAR
    {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // JULIAN_DAY
    {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // MILLISECONDS_IN_DAY
    {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // IS_LEAP_MONTH
};

static const double JULIAN_EPOCH = 1721425.5;
static const int32_t INDIAN_ERA_START  = 78;
static const int32_t INDIAN_YEAR_START = 80;

int32_t IndianCalendar::handleGetLimit(UCalendarDateFields field, ELimitType limitType) const {
  return LIMITS[field][limitType];
}

/*
 * Determine whether the given gregorian year is a Leap year 
 */
static UBool isGregorianLeap(int32_t year)
{
    return ((year % 4) == 0) && (!(((year % 100) == 0) && ((year % 400) != 0))); 
}
  
//----------------------------------------------------------------------
// Calendar framework
//----------------------------------------------------------------------

/*
 * Return the length (in days) of the given month.
 *
 * @param eyear  The year in Saka Era
 * @param month  The month(0-based) in Indian calendar
 */
int32_t IndianCalendar::handleGetMonthLength(int32_t eyear, int32_t month) const {
   if (month < 0 || month > 11) {
      eyear += ClockMath::floorDivide(month, 12, month);
   }

   if (isGregorianLeap(eyear + INDIAN_ERA_START) && month == 0) {
       return 31;
   }

   if (month >= 1 && month <= 5) {
       return 31;
   }

   return 30;
}

/*
 * Return the number of days in the given Indian year
 *
 * @param eyear The year in Saka Era.
 */
int32_t IndianCalendar::handleGetYearLength(int32_t eyear) const {
    return isGregorianLeap(eyear + INDIAN_ERA_START) ? 366 : 365;
}
/*
 * Returns the Julian Day corresponding to gregorian date
 *
 * @param year The Gregorian year
 * @param month The month in Gregorian Year
 * @param date The date in Gregorian day in month
 */
static double gregorianToJD(int32_t year, int32_t month, int32_t date) {
   double julianDay = (JULIAN_EPOCH - 1) +
      (365 * (year - 1)) +
      uprv_floor((year - 1) / 4) +
      (-uprv_floor((year - 1) / 100)) +
      uprv_floor((year - 1) / 400) +
      uprv_floor((((367 * month) - 362) / 12) +
            ((month <= 2) ? 0 :
             (isGregorianLeap(year) ? -1 : -2)
            ) +
            date);

   return julianDay;
}

/*
 * Returns the Gregorian Date corresponding to a given Julian Day
 * @param jd The Julian Day
 */
static int32_t* jdToGregorian(double jd, int32_t gregorianDate[3]) {
   double wjd, depoch, quadricent, dqc, cent, dcent, quad, dquad, yindex, yearday, leapadj;
   int32_t year, month, day;
   wjd = uprv_floor(jd - 0.5) + 0.5;
   depoch = wjd - JULIAN_EPOCH;
   quadricent = uprv_floor(depoch / 146097);
   dqc = (int32_t)uprv_floor(depoch) % 146097;
   cent = uprv_floor(dqc / 36524);
   dcent = (int32_t)uprv_floor(dqc) % 36524;
   quad = uprv_floor(dcent / 1461);
   dquad = (int32_t)uprv_floor(dcent) % 1461;
   yindex = uprv_floor(dquad / 365);
   year = (int32_t)((quadricent * 400) + (cent * 100) + (quad * 4) + yindex);
   if (!((cent == 4) || (yindex == 4))) {
      year++;
   }
   yearday = wjd - gregorianToJD(year, 1, 1);
   leapadj = ((wjd < gregorianToJD(year, 3, 1)) ? 0
         :
         (isGregorianLeap(year) ? 1 : 2)
         );
   month = (int32_t)uprv_floor((((yearday + leapadj) * 12) + 373) / 367);
   day = (int32_t)(wjd - gregorianToJD(year, month, 1)) + 1;

   gregorianDate[0] = year;
   gregorianDate[1] = month;
   gregorianDate[2] = day;

   return gregorianDate;
}

   
//-------------------------------------------------------------------------
// Functions for converting from field values to milliseconds....
//-------------------------------------------------------------------------
static double IndianToJD(int32_t year, int32_t month, int32_t date) {
   int32_t leapMonth, gyear, m;
   double start, jd;

   gyear = year + INDIAN_ERA_START;


   if(isGregorianLeap(gyear)) {
      leapMonth = 31;
      start = gregorianToJD(gyear, 3, 21);
   } 
   else {
      leapMonth = 30;
      start = gregorianToJD(gyear, 3, 22);
   }

   if (month == 1) {
      jd = start + (date - 1);
   } else {
      jd = start + leapMonth;
      m = month - 2;

      //m = Math.min(m, 5);
      if (m > 5) {
          m = 5;
      }

      jd += m * 31;

      if (month >= 8) {
         m = month - 7;
         jd += m * 30;
      }
      jd += date - 1;
   }

   return jd;
}

/*
 * Return JD of start of given month/year of Indian Calendar
 * @param eyear The year in Indian Calendar measured from Saka Era (78 AD).
 * @param month The month in Indian calendar
 */
int32_t IndianCalendar::handleComputeMonthStart(int32_t eyear, int32_t month, UBool /* useMonth */ ) const {

   //month is 0 based; converting it to 1-based 
   int32_t imonth;

    // If the month is out of range, adjust it into range, and adjust the extended eyar accordingly
   if (month < 0 || month > 11) {
      eyear += (int32_t)ClockMath::floorDivide(month, 12, month);
   }

   if(month == 12){
       imonth = 1;
   } else {
       imonth = month + 1; 
   }
   
   double jd = IndianToJD(eyear ,imonth, 1);

   return (int32_t)jd;
}

//-------------------------------------------------------------------------
// Functions for converting from milliseconds to field values
//-------------------------------------------------------------------------

int32_t IndianCalendar::handleGetExtendedYear() {
    int32_t year;

    if (newerField(UCAL_EXTENDED_YEAR, UCAL_YEAR) == UCAL_EXTENDED_YEAR) {
        year = internalGet(UCAL_EXTENDED_YEAR, 1); // Default to year 1
    } else {
        year = internalGet(UCAL_YEAR, 1); // Default to year 1
    }

    return year;
}

/*
 * Override Calendar to compute several fields specific to the Indian
 * calendar system.  These are:
 *
 * <ul><li>ERA
 * <li>YEAR
 * <li>MONTH
 * <li>DAY_OF_MONTH
 * <li>EXTENDED_YEAR</ul>
 * 
 * The DAY_OF_WEEK and DOW_LOCAL fields are already set when this
 * method is called. The getGregorianXxx() methods return Gregorian
 * calendar equivalents for the given Julian day.
 */
void IndianCalendar::handleComputeFields(int32_t julianDay, UErrorCode&  /* status */) {
    double jdAtStartOfGregYear;
    int32_t leapMonth, IndianYear, yday, IndianMonth, IndianDayOfMonth, mday;
    int32_t gregorianYear;      // Stores gregorian date corresponding to Julian day;
    int32_t gd[3];

    gregorianYear = jdToGregorian(julianDay, gd)[0];          // Gregorian date for Julian day
    IndianYear = gregorianYear - INDIAN_ERA_START;            // Year in Saka era
    jdAtStartOfGregYear = gregorianToJD(gregorianYear, 1, 1); // JD at start of Gregorian year
    yday = (int32_t)(julianDay - jdAtStartOfGregYear);        // Day number in Gregorian year (starting from 0)

    if (yday < INDIAN_YEAR_START) {
        // Day is at the end of the preceding Saka year
        IndianYear -= 1;
        leapMonth = isGregorianLeap(gregorianYear - 1) ? 31 : 30; // Days in leapMonth this year, previous Gregorian year
        yday += leapMonth + (31 * 5) + (30 * 3) + 10;
    } else {
        leapMonth = isGregorianLeap(gregorianYear) ? 31 : 30; // Days in leapMonth this year
        yday -= INDIAN_YEAR_START;
    }

    if (yday < leapMonth) {
        IndianMonth = 0;
        IndianDayOfMonth = yday + 1;
    } else {
        mday = yday - leapMonth;
        if (mday < (31 * 5)) {
            IndianMonth = (int32_t)uprv_floor(mday / 31) + 1;
            IndianDayOfMonth = (mday % 31) + 1;
        } else {
            mday -= 31 * 5;
            IndianMonth = (int32_t)uprv_floor(mday / 30) + 6;
            IndianDayOfMonth = (mday % 30) + 1;
        }
   }

   internalSet(UCAL_ERA, 0);
   internalSet(UCAL_EXTENDED_YEAR, IndianYear);
   internalSet(UCAL_YEAR, IndianYear);
   internalSet(UCAL_MONTH, IndianMonth);
   internalSet(UCAL_DAY_OF_MONTH, IndianDayOfMonth);
   internalSet(UCAL_DAY_OF_YEAR, yday + 1); // yday is 0-based
}    

UBool
IndianCalendar::inDaylightTime(UErrorCode& status) const
{
    // copied from GregorianCalendar
    if (U_FAILURE(status) || !getTimeZone().useDaylightTime()) {
        return FALSE;
    }

    // Force an update of the state of the Calendar.
    ((IndianCalendar*)this)->complete(status); // cast away const

    return (UBool)(U_SUCCESS(status) ? (internalGet(UCAL_DST_OFFSET) != 0) : FALSE);
}


/**
 * The system maintains a static default century start date and Year.  They are
 * initialized the first time they are used.  Once the system default century date
 * and year are set, they do not change.
 */
static UDate           gSystemDefaultCenturyStart       = DBL_MIN;
static int32_t         gSystemDefaultCenturyStartYear   = -1;
static icu::UInitOnce  gSystemDefaultCenturyInit        = U_INITONCE_INITIALIZER;


UBool IndianCalendar::haveDefaultCentury() const
{
    return TRUE;
}

static void U_CALLCONV
initializeSystemDefaultCentury()
{
    // initialize systemDefaultCentury and systemDefaultCenturyYear based
    // on the current time.  They'll be set to 80 years before
    // the current time.
    UErrorCode status = U_ZERO_ERROR;

    IndianCalendar calendar ( Locale ( "@calendar=Indian" ), status);
    if ( U_SUCCESS ( status ) ) {
        calendar.setTime ( Calendar::getNow(), status );
        calendar.add ( UCAL_YEAR, -80, status );

        UDate    newStart = calendar.getTime ( status );
        int32_t  newYear  = calendar.get ( UCAL_YEAR, status );

        gSystemDefaultCenturyStart = newStart;
        gSystemDefaultCenturyStartYear = newYear;
    }
    // We have no recourse upon failure.
}


UDate
IndianCalendar::defaultCenturyStart() const
{
    // lazy-evaluate systemDefaultCenturyStart
    umtx_initOnce(gSystemDefaultCenturyInit, &initializeSystemDefaultCentury);
    return gSystemDefaultCenturyStart;
}

int32_t
IndianCalendar::defaultCenturyStartYear() const
{
    // lazy-evaluate systemDefaultCenturyStartYear
    umtx_initOnce(gSystemDefaultCenturyInit, &initializeSystemDefaultCentury);
    return    gSystemDefaultCenturyStartYear;
}


UOBJECT_DEFINE_RTTI_IMPLEMENTATION(IndianCalendar)

U_NAMESPACE_END

#endif
Commit	Line	Data
f3c0d7a5 A	1	// © 2016 and later: Unicode, Inc. and others.
f3c0d7a5 A	2	// License & terms of use: http://www.unicode.org/copyright.html
46f4442e	3	/*
b331163b	4	* Copyright (C) 2003-2014, International Business Machines Corporation
46f4442e A	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"
46f4442e A	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) {
729e4ab9	114	eyear += ClockMath::floorDivide(month, 12, month);
46f4442e A	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	*/
729e4ab9	241	int32_t IndianCalendar::handleComputeMonthStart(int32_t eyear, int32_t month, UBool /* useMonth */ ) const {
46f4442e A	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) {
729e4ab9	248	eyear += (int32_t)ClockMath::floorDivide(month, 12, month);
46f4442e A	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	*/
729e4ab9	292	void IndianCalendar::handleComputeFields(int32_t julianDay, UErrorCode& /* status */) {
46f4442e A	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
46f4442e	350
3d1f044b A	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	*/
	356	static UDate gSystemDefaultCenturyStart = DBL_MIN;
	357	static int32_t gSystemDefaultCenturyStartYear = -1;
	358	static icu::UInitOnce gSystemDefaultCenturyInit = U_INITONCE_INITIALIZER;
46f4442e A	359
	360
	361	UBool IndianCalendar::haveDefaultCentury() const
	362	{
	363	return TRUE;
	364	}
	365
3d1f044b A	366	static void U_CALLCONV
3d1f044b A	367	initializeSystemDefaultCentury()
46f4442e	368	{
3d1f044b A	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;
46f4442e	373
3d1f044b A	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 );
46f4442e	378
3d1f044b A	379	UDate newStart = calendar.getTime ( status );
3d1f044b A	380	int32_t newYear = calendar.get ( UCAL_YEAR, status );
46f4442e	381
3d1f044b A	382	gSystemDefaultCenturyStart = newStart;
3d1f044b A	383	gSystemDefaultCenturyStartYear = newYear;
46f4442e	384	}
3d1f044b A	385	// We have no recourse upon failure.
3d1f044b A	386	}
46f4442e	387
46f4442e	388
3d1f044b A	389	UDate
	390	IndianCalendar::defaultCenturyStart() const
	391	{
	392	// lazy-evaluate systemDefaultCenturyStart
	393	umtx_initOnce(gSystemDefaultCenturyInit, &initializeSystemDefaultCentury);
	394	return gSystemDefaultCenturyStart;
46f4442e A	395	}
	396
	397	int32_t
3d1f044b	398	IndianCalendar::defaultCenturyStartYear() const
46f4442e A	399	{
46f4442e A	400	// lazy-evaluate systemDefaultCenturyStartYear
3d1f044b A	401	umtx_initOnce(gSystemDefaultCenturyInit, &initializeSystemDefaultCentury);
3d1f044b A	402	return gSystemDefaultCenturyStartYear;
46f4442e A	403	}
46f4442e A	404
46f4442e A	405
	406	UOBJECT_DEFINE_RTTI_IMPLEMENTATION(IndianCalendar)
	407
	408	U_NAMESPACE_END
	409
	410	#endif
	411