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

/*
 ******************************************************************************
 * Copyright (C) 2003-2008, International Business Machines Corporation
 * and others. All Rights Reserved.
 ******************************************************************************
 *
 * File PERSNCAL.CPP
 *
 * Modification History:
 *
 *   Date        Name        Description
 *   9/23/2003 mehran        posted to icu-design
 *****************************************************************************
 */

#include "persncal.h"

#if !UCONFIG_NO_FORMATTING

#include "umutex.h"
#include <float.h>

static const int8_t monthDays[] = { 31, 31, 31, 31, 31, 31, 30, 30, 30, 30, 30, 29 };

static int32_t
jalali_to_julian(int year, int month, int day) 
{
    int32_t daysNo=0;
    int i;

    year = year -475+2820;
    month -= 1;

    daysNo=(year/2820)*1029983;
    year=year % 2820;  

    daysNo+=(year/128)* 46751;
    if((year/128)>21)
    {
        daysNo-=46751;
        year=(year%128)+128;
    }
    else
        year=year%128;

    if(year>=29)
    {
        year-=29;
        daysNo+=10592;
    }

    if(year>=66)
    {
        year-=66;
        daysNo+=24106;
    }
    else if( year>=33)
    {
        daysNo+=(year/33)* 12053;
        year=year%33;
    }

    if (year >= 5)
    {
        daysNo += 1826;
        year -=5;
    }
    else if (year == 4)
    {
        daysNo += 1460;
        year -=4;
    }

    daysNo += 1461 * (year/4);
    year %= 4;
    daysNo += 365 * year;

    for (i = 0; i < month; i++) {
        daysNo += monthDays[i];
    }

    daysNo += day;

    return daysNo-856493;
}

static void julian_to_jalali (int32_t daysNo, int *h_y, int *h_m, int *h_d) 
{
    int year=0, month=0, day=0,scalarDays=0;
    int i;

    daysNo+=856493;
    scalarDays=daysNo;
    year=(daysNo/1029983)*2820;
    daysNo=daysNo%1029983;

    if((daysNo/46751)<=21)
    {
        year+=(daysNo/46751)* 128;
        daysNo=daysNo%46751;
    }
    else
    {
        year+=(daysNo/46751)* 128;
        daysNo=daysNo%46751;
        year-=128;
        daysNo+=46751;
    }

    if (daysNo >= 10592)
    {
        year+= 29;
        daysNo -= 10592;
    }

    if(daysNo>=24106)
    {
        daysNo-=24106;
        year+=66;
    }

    if(daysNo>=12053)
    {
        daysNo-=12053;
        year+=33;
    }


    if (daysNo >= 1826)
    {
        year+= 5;
        daysNo -= 1826;
    }
    else if (daysNo > 1095)
    {
        year+= 3;
        daysNo -= 1095;

    }

    year +=(4 * (daysNo/1461));
    daysNo %= 1461;

    if (daysNo == 0)
    {
        year -= 1;
        daysNo = 366;
    }
    else
    {
        year += daysNo/365;
        daysNo = daysNo % 365;
        if (daysNo == 0)
        {
            year -= 1;
            daysNo = 365;
        }

    }

    for (i = 0; i < 11 && daysNo > monthDays[i]; ++i) {
        daysNo -= monthDays[i];
    }

    month = i + 1;

    day = daysNo;

    *h_d = day;
    *h_m = month;
    *h_y = year-2345;
}

U_NAMESPACE_BEGIN

// Implementation of the PersianCalendar class

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

const char *PersianCalendar::getType() const { 
    return "persian";
}

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

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

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

PersianCalendar::~PersianCalendar()
{
}

//-------------------------------------------------------------------------
// Minimum / Maximum access functions
//-------------------------------------------------------------------------

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,        29,       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 int32_t MONTH_COUNT[12][4]  = {
    //len len2   st  st2
    {  31,  31,   0,   0 }, // Farvardin
    {  31,  31,  31,  31 }, // Ordibehesht
    {  31,  31,  62,  62 }, // Khordad
    {  31,  31,  93,  93 }, // Tir
    {  31,  31, 124, 124 }, // Mordad
    {  31,  31, 155, 155 }, // Shahrivar
    {  30,  30, 186, 186 }, // Mehr
    {  30,  30, 216, 216 }, // Aban
    {  30,  30, 246, 246 }, // Azar
    {  30,  30, 276, 276 }, // Dey
    {  30,  30, 306, 306 }, // Bahman
    {  29,  30, 336, 336 }  // Esfand
    // len  length of month
    // len2 length of month in a leap year
    // st   days in year before start of month
    // st2  days in year before month in leap year
};

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

//-------------------------------------------------------------------------
// Assorted calculation utilities
//

/**
 * Determine whether a year is a leap year in the Persian calendar
 */
UBool PersianCalendar::isLeapYear(int32_t year)
{
    return jalali_to_julian(year+1,1,1)-jalali_to_julian(year,1,1) == 366;
}
    
/**
 * Return the day # on which the given year starts.  Days are counted
 * from the Hijri epoch, origin 0.
 */
int32_t PersianCalendar::yearStart(int32_t year) {
    return handleComputeMonthStart(year,1,FALSE);
}
    
/**
 * Return the day # on which the given month starts.  Days are counted
 * from the Hijri epoch, origin 0.
 *
 * @param year  The hijri shamsi year
 * @param year  The hijri shamsi month, 0-based
 */
int32_t PersianCalendar::monthStart(int32_t year, int32_t month) const {
    return handleComputeMonthStart(year,month,FALSE);
}
    
//----------------------------------------------------------------------
// Calendar framework
//----------------------------------------------------------------------

/**
 * Return the length (in days) of the given month.
 *
 * @param year  The hijri shamsi year
 * @param year  The hijri shamsi month, 0-based
 */
int32_t PersianCalendar::handleGetMonthLength(int32_t extendedYear, int32_t month) const {
    return MONTH_COUNT[month][PersianCalendar::isLeapYear(extendedYear)?1:0];
}

/**
 * Return the number of days in the given Persian year
 */
int32_t PersianCalendar::handleGetYearLength(int32_t extendedYear) const {
    return 365 + (PersianCalendar::isLeapYear(extendedYear) ? 1 : 0);
}
    
//-------------------------------------------------------------------------
// Functions for converting from field values to milliseconds....
//-------------------------------------------------------------------------

// Return JD of start of given month/year
int32_t PersianCalendar::handleComputeMonthStart(int32_t eyear, int32_t month, UBool useMonth) const {
    // If the month is out of range, adjust it into range, and
    // modify the extended year value accordingly.
    if (month < 0 || month > 11) {
        eyear += month / 12;
        month = month % 12;
    }
    return jalali_to_julian(eyear,(useMonth?month+1:1),1)-1+1947955; 
}

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

int32_t PersianCalendar::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 Persian
 * calendar system.  These are:
 *
 * <ul><li>ERA
 * <li>YEAR
 * <li>MONTH
 * <li>DAY_OF_MONTH
 * <li>DAY_OF_YEAR
 * <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 PersianCalendar::handleComputeFields(int32_t julianDay, UErrorCode &/*status*/) {
    int jy,jm,jd;        
    julian_to_jalali(julianDay-1947955,&jy,&jm,&jd);
    internalSet(UCAL_ERA, 0);
    internalSet(UCAL_YEAR, jy);
    internalSet(UCAL_EXTENDED_YEAR, jy);
    internalSet(UCAL_MONTH, jm-1);
    internalSet(UCAL_DAY_OF_MONTH, jd);
    internalSet(UCAL_DAY_OF_YEAR, jd + MONTH_COUNT[jm-1][2]);
}    

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

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

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

// default century
const UDate     PersianCalendar::fgSystemDefaultCentury        = DBL_MIN;
const int32_t   PersianCalendar::fgSystemDefaultCenturyYear    = -1;

UDate           PersianCalendar::fgSystemDefaultCenturyStart       = DBL_MIN;
int32_t         PersianCalendar::fgSystemDefaultCenturyStartYear   = -1;

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

UDate PersianCalendar::defaultCenturyStart() const
{
    return internalGetDefaultCenturyStart();
}

int32_t PersianCalendar::defaultCenturyStartYear() const
{
    return internalGetDefaultCenturyStartYear();
}

UDate
PersianCalendar::internalGetDefaultCenturyStart() const
{
    // lazy-evaluate systemDefaultCenturyStart
    UBool needsUpdate;
    UMTX_CHECK(NULL, (fgSystemDefaultCenturyStart == fgSystemDefaultCentury), needsUpdate);

    if (needsUpdate) {
        initializeSystemDefaultCentury();
    }

    // use defaultCenturyStart unless it's the flag value;
    // then use systemDefaultCenturyStart

    return fgSystemDefaultCenturyStart;
}

int32_t
PersianCalendar::internalGetDefaultCenturyStartYear() const
{
    // lazy-evaluate systemDefaultCenturyStartYear
    UBool needsUpdate;
    UMTX_CHECK(NULL, (fgSystemDefaultCenturyStart == fgSystemDefaultCentury), needsUpdate);

    if (needsUpdate) {
        initializeSystemDefaultCentury();
    }

    // use defaultCenturyStart unless it's the flag value;
    // then use systemDefaultCenturyStartYear

    return    fgSystemDefaultCenturyStartYear;
}

void
PersianCalendar::initializeSystemDefaultCentury()
{
    // initialize systemDefaultCentury and systemDefaultCenturyYear based
    // on the current time.  They'll be set to 80 years before
    // the current time.
    // No point in locking as it should be idempotent.
    if (fgSystemDefaultCenturyStart == fgSystemDefaultCentury)
    {
        UErrorCode status = U_ZERO_ERROR;
        PersianCalendar calendar(Locale("@calendar=persian"),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);
            {
                umtx_lock(NULL);
                fgSystemDefaultCenturyStart = newStart;
                fgSystemDefaultCenturyStartYear = newYear;
                umtx_unlock(NULL);
            }
        }
        // We have no recourse upon failure unless we want to propagate the failure
        // out.
    }
}

UOBJECT_DEFINE_RTTI_IMPLEMENTATION(PersianCalendar)

U_NAMESPACE_END

#endif
Commit	Line	Data
46f4442e A	1	/*
	2	******************************************************************************
	3	* Copyright (C) 2003-2008, International Business Machines Corporation
	4	* and others. All Rights Reserved.
	5	******************************************************************************
	6	*
	7	* File PERSNCAL.CPP
	8	*
	9	* Modification History:
	10	*
	11	* Date Name Description
	12	* 9/23/2003 mehran posted to icu-design
	13	*****************************************************************************
	14	*/
	15
	16	#include "persncal.h"
	17
	18	#if !UCONFIG_NO_FORMATTING
	19
	20	#include "umutex.h"
	21	#include <float.h>
	22
	23	static const int8_t monthDays[] = { 31, 31, 31, 31, 31, 31, 30, 30, 30, 30, 30, 29 };
	24
	25	static int32_t
	26	jalali_to_julian(int year, int month, int day)
	27	{
	28	int32_t daysNo=0;
	29	int i;
	30
	31	year = year -475+2820;
	32	month -= 1;
	33
	34	daysNo=(year/2820)*1029983;
	35	year=year % 2820;
	36
	37	daysNo+=(year/128)* 46751;
	38	if((year/128)>21)
	39	{
	40	daysNo-=46751;
	41	year=(year%128)+128;
	42	}
	43	else
	44	year=year%128;
	45
	46	if(year>=29)
	47	{
	48	year-=29;
	49	daysNo+=10592;
	50	}
	51
	52	if(year>=66)
	53	{
	54	year-=66;
	55	daysNo+=24106;
	56	}
	57	else if( year>=33)
	58	{
	59	daysNo+=(year/33)* 12053;
	60	year=year%33;
	61	}
	62
	63	if (year >= 5)
	64	{
65	daysNo += 1826;
66	year -=5;
67	}
68	else if (year == 4)
69	{
70	daysNo += 1460;
71	year -=4;
72	}
73
74	daysNo += 1461 * (year/4);
75	year %= 4;
76	daysNo += 365 * year;
77
78	for (i = 0; i < month; i++) {
79	daysNo += monthDays[i];
80	}
81
82	daysNo += day;
83
84	return daysNo-856493;
85	}
86
87	static void julian_to_jalali (int32_t daysNo, int h_y, int h_m, int *h_d)
88	{
89	int year=0, month=0, day=0,scalarDays=0;
90	int i;
91
92	daysNo+=856493;
93	scalarDays=daysNo;
94	year=(daysNo/1029983)*2820;
95	daysNo=daysNo%1029983;
96
97	if((daysNo/46751)<=21)
98	{
99	year+=(daysNo/46751)* 128;
100	daysNo=daysNo%46751;
101	}
102	else
103	{
104	year+=(daysNo/46751)* 128;
105	daysNo=daysNo%46751;
106	year-=128;
107	daysNo+=46751;
108	}
109
110	if (daysNo >= 10592)
111	{
112	year+= 29;
113	daysNo -= 10592;
114	}
115
116	if(daysNo>=24106)
117	{
118	daysNo-=24106;
119	year+=66;
120	}
121
122	if(daysNo>=12053)
123	{
124	daysNo-=12053;
125	year+=33;
126	}
127
128
129	if (daysNo >= 1826)
130	{
131	year+= 5;
132	daysNo -= 1826;
133	}
134	else if (daysNo > 1095)
135	{
136	year+= 3;
137	daysNo -= 1095;
138
139	}
140
141	year +=(4 * (daysNo/1461));
142	daysNo %= 1461;
143
144	if (daysNo == 0)
145	{
146	year -= 1;
147	daysNo = 366;
148	}
149	else
150	{
151	year += daysNo/365;
152	daysNo = daysNo % 365;
153	if (daysNo == 0)
154	{
155	year -= 1;
156	daysNo = 365;
157	}
158
159	}
160
161	for (i = 0; i < 11 && daysNo > monthDays[i]; ++i) {
162	daysNo -= monthDays[i];
163	}
164
165	month = i + 1;
166
167	day = daysNo;
168
169	*h_d = day;
170	*h_m = month;
171	*h_y = year-2345;
172	}
173
174	U_NAMESPACE_BEGIN
175
176	// Implementation of the PersianCalendar class
177
178	//-------------------------------------------------------------------------
179	// Constructors...
180	//-------------------------------------------------------------------------
181
182	const char *PersianCalendar::getType() const {
183	return "persian";
184	}
185
186	Calendar* PersianCalendar::clone() const {
187	return new PersianCalendar(*this);
188	}
189
190	PersianCalendar::PersianCalendar(const Locale& aLocale, UErrorCode& success)
191	: Calendar(TimeZone::createDefault(), aLocale, success)
192	{
193	setTimeInMillis(getNow(), success); // Call this again now that the vtable is set up properly.
194	}
195
196	PersianCalendar::PersianCalendar(const PersianCalendar& other) : Calendar(other) {
197	}
198
199	PersianCalendar::~PersianCalendar()
200	{
201	}
202
203	//-------------------------------------------------------------------------
204	// Minimum / Maximum access functions
205	//-------------------------------------------------------------------------
206
207	static const int32_t LIMITS[UCAL_FIELD_COUNT][4] = {
208	// Minimum Greatest Least Maximum
209	// Minimum Maximum
210	{ 0, 0, 0, 0}, // ERA
211	{ -5000000, -5000000, 5000000, 5000000}, // YEAR
212	{ 0, 0, 11, 11}, // MONTH
213	{ 1, 1, 52, 53}, // WEEK_OF_YEAR
214	{/N/A/-1,/N/A/-1,/N/A/-1,/N/A/-1}, // WEEK_OF_MONTH
215	{ 1, 1, 29, 31}, // DAY_OF_MONTH
216	{ 1, 1, 365, 366}, // DAY_OF_YEAR
217	{/N/A/-1,/N/A/-1,/N/A/-1,/N/A/-1}, // DAY_OF_WEEK
218	{ 1, 1, 5, 5}, // DAY_OF_WEEK_IN_MONTH
219	{/N/A/-1,/N/A/-1,/N/A/-1,/N/A/-1}, // AM_PM
220	{/N/A/-1,/N/A/-1,/N/A/-1,/N/A/-1}, // HOUR
221	{/N/A/-1,/N/A/-1,/N/A/-1,/N/A/-1}, // HOUR_OF_DAY
222	{/N/A/-1,/N/A/-1,/N/A/-1,/N/A/-1}, // MINUTE
223	{/N/A/-1,/N/A/-1,/N/A/-1,/N/A/-1}, // SECOND
224	{/N/A/-1,/N/A/-1,/N/A/-1,/N/A/-1}, // MILLISECOND
225	{/N/A/-1,/N/A/-1,/N/A/-1,/N/A/-1}, // ZONE_OFFSET
226	{/N/A/-1,/N/A/-1,/N/A/-1,/N/A/-1}, // DST_OFFSET
227	{ -5000000, -5000000, 5000000, 5000000}, // YEAR_WOY
228	{/N/A/-1,/N/A/-1,/N/A/-1,/N/A/-1}, // DOW_LOCAL
229	{ -5000000, -5000000, 5000000, 5000000}, // EXTENDED_YEAR
230	{/N/A/-1,/N/A/-1,/N/A/-1,/N/A/-1}, // JULIAN_DAY
231	{/N/A/-1,/N/A/-1,/N/A/-1,/N/A/-1}, // MILLISECONDS_IN_DAY
232	{/N/A/-1,/N/A/-1,/N/A/-1,/N/A/-1}, // IS_LEAP_MONTH
233	};
234	static const int32_t MONTH_COUNT[12][4] = {
235	//len len2 st st2
236	{ 31, 31, 0, 0 }, // Farvardin
237	{ 31, 31, 31, 31 }, // Ordibehesht
238	{ 31, 31, 62, 62 }, // Khordad
239	{ 31, 31, 93, 93 }, // Tir
240	{ 31, 31, 124, 124 }, // Mordad
241	{ 31, 31, 155, 155 }, // Shahrivar
242	{ 30, 30, 186, 186 }, // Mehr
243	{ 30, 30, 216, 216 }, // Aban
244	{ 30, 30, 246, 246 }, // Azar
245	{ 30, 30, 276, 276 }, // Dey
246	{ 30, 30, 306, 306 }, // Bahman
247	{ 29, 30, 336, 336 } // Esfand
248	// len length of month
249	// len2 length of month in a leap year
250	// st days in year before start of month
251	// st2 days in year before month in leap year
252	};
253
254	int32_t PersianCalendar::handleGetLimit(UCalendarDateFields field, ELimitType limitType) const {
255	return LIMITS[field][limitType];
256	}
257
258	//-------------------------------------------------------------------------
259	// Assorted calculation utilities
260	//
261
262	/**
263	* Determine whether a year is a leap year in the Persian calendar
264	*/
265	UBool PersianCalendar::isLeapYear(int32_t year)
266	{
267	return jalali_to_julian(year+1,1,1)-jalali_to_julian(year,1,1) == 366;
268	}
269
270	/**
271	* Return the day # on which the given year starts. Days are counted
272	* from the Hijri epoch, origin 0.
273	*/
274	int32_t PersianCalendar::yearStart(int32_t year) {
275	return handleComputeMonthStart(year,1,FALSE);
276	}
277
278	/**
279	* Return the day # on which the given month starts. Days are counted
280	* from the Hijri epoch, origin 0.
281	*
282	* @param year The hijri shamsi year
283	* @param year The hijri shamsi month, 0-based
284	*/
285	int32_t PersianCalendar::monthStart(int32_t year, int32_t month) const {
286	return handleComputeMonthStart(year,month,FALSE);
287	}
288
289	//----------------------------------------------------------------------
290	// Calendar framework
291	//----------------------------------------------------------------------
292
293	/**
294	* Return the length (in days) of the given month.
295	*
296	* @param year The hijri shamsi year
297	* @param year The hijri shamsi month, 0-based
298	*/
299	int32_t PersianCalendar::handleGetMonthLength(int32_t extendedYear, int32_t month) const {
300	return MONTH_COUNT[month][PersianCalendar::isLeapYear(extendedYear)?1:0];
301	}
302
303	/**
304	* Return the number of days in the given Persian year
305	*/
306	int32_t PersianCalendar::handleGetYearLength(int32_t extendedYear) const {
307	return 365 + (PersianCalendar::isLeapYear(extendedYear) ? 1 : 0);
308	}
309
310	//-------------------------------------------------------------------------
311	// Functions for converting from field values to milliseconds....
312	//-------------------------------------------------------------------------
313
314	// Return JD of start of given month/year
315	int32_t PersianCalendar::handleComputeMonthStart(int32_t eyear, int32_t month, UBool useMonth) const {
316	// If the month is out of range, adjust it into range, and
317	// modify the extended year value accordingly.
318	if (month < 0 \|\| month > 11) {
319	eyear += month / 12;
320	month = month % 12;
321	}
322	return jalali_to_julian(eyear,(useMonth?month+1:1),1)-1+1947955;
323	}
324
325	//-------------------------------------------------------------------------
326	// Functions for converting from milliseconds to field values
327	//-------------------------------------------------------------------------
328
329	int32_t PersianCalendar::handleGetExtendedYear() {
330	int32_t year;
331	if (newerField(UCAL_EXTENDED_YEAR, UCAL_YEAR) == UCAL_EXTENDED_YEAR) {
332	year = internalGet(UCAL_EXTENDED_YEAR, 1); // Default to year 1
333	} else {
334	year = internalGet(UCAL_YEAR, 1); // Default to year 1
335	}
336	return year;
337	}
338
339	/**
340	* Override Calendar to compute several fields specific to the Persian
341	* calendar system. These are:
342	*
343	* <ul><li>ERA
344	* <li>YEAR
345	* <li>MONTH
346	* <li>DAY_OF_MONTH
347	* <li>DAY_OF_YEAR
348	* <li>EXTENDED_YEAR</ul>
349	*
350	* The DAY_OF_WEEK and DOW_LOCAL fields are already set when this
351	* method is called. The getGregorianXxx() methods return Gregorian
352	* calendar equivalents for the given Julian day.
353	*/
354	void PersianCalendar::handleComputeFields(int32_t julianDay, UErrorCode &/status/) {
355	int jy,jm,jd;
356	julian_to_jalali(julianDay-1947955,&jy,&jm,&jd);
357	internalSet(UCAL_ERA, 0);
358	internalSet(UCAL_YEAR, jy);
359	internalSet(UCAL_EXTENDED_YEAR, jy);
360	internalSet(UCAL_MONTH, jm-1);
361	internalSet(UCAL_DAY_OF_MONTH, jd);
362	internalSet(UCAL_DAY_OF_YEAR, jd + MONTH_COUNT[jm-1][2]);
363	}
364
365	UBool
366	PersianCalendar::inDaylightTime(UErrorCode& status) const
367	{
368	// copied from GregorianCalendar
369	if (U_FAILURE(status) \|\| !getTimeZone().useDaylightTime())
370	return FALSE;
371
372	// Force an update of the state of the Calendar.
373	((PersianCalendar*)this)->complete(status); // cast away const
374
375	return (UBool)(U_SUCCESS(status) ? (internalGet(UCAL_DST_OFFSET) != 0) : FALSE);
376	}
377
378	// default century
379	const UDate PersianCalendar::fgSystemDefaultCentury = DBL_MIN;
380	const int32_t PersianCalendar::fgSystemDefaultCenturyYear = -1;
381
382	UDate PersianCalendar::fgSystemDefaultCenturyStart = DBL_MIN;
383	int32_t PersianCalendar::fgSystemDefaultCenturyStartYear = -1;
384
385	UBool PersianCalendar::haveDefaultCentury() const
386	{
387	return TRUE;
388	}
389
390	UDate PersianCalendar::defaultCenturyStart() const
391	{
392	return internalGetDefaultCenturyStart();
393	}
394
395	int32_t PersianCalendar::defaultCenturyStartYear() const
396	{
397	return internalGetDefaultCenturyStartYear();
398	}
399
400	UDate
401	PersianCalendar::internalGetDefaultCenturyStart() const
402	{
403	// lazy-evaluate systemDefaultCenturyStart
404	UBool needsUpdate;
405	UMTX_CHECK(NULL, (fgSystemDefaultCenturyStart == fgSystemDefaultCentury), needsUpdate);
406
407	if (needsUpdate) {
408	initializeSystemDefaultCentury();
409	}
410
411	// use defaultCenturyStart unless it's the flag value;
412	// then use systemDefaultCenturyStart
413
414	return fgSystemDefaultCenturyStart;
415	}
416
417	int32_t
418	PersianCalendar::internalGetDefaultCenturyStartYear() const
419	{
420	// lazy-evaluate systemDefaultCenturyStartYear
421	UBool needsUpdate;
422	UMTX_CHECK(NULL, (fgSystemDefaultCenturyStart == fgSystemDefaultCentury), needsUpdate);
423
424	if (needsUpdate) {
425	initializeSystemDefaultCentury();
426	}
427
428	// use defaultCenturyStart unless it's the flag value;
429	// then use systemDefaultCenturyStartYear
430
431	return fgSystemDefaultCenturyStartYear;
432	}
433
434	void
435	PersianCalendar::initializeSystemDefaultCentury()
436	{
437	// initialize systemDefaultCentury and systemDefaultCenturyYear based
438	// on the current time. They'll be set to 80 years before
439	// the current time.
440	// No point in locking as it should be idempotent.
441	if (fgSystemDefaultCenturyStart == fgSystemDefaultCentury)
442	{
443	UErrorCode status = U_ZERO_ERROR;
444	PersianCalendar calendar(Locale("@calendar=persian"),status);
445	if (U_SUCCESS(status))
446	{
447	calendar.setTime(Calendar::getNow(), status);
448	calendar.add(UCAL_YEAR, -80, status);
449	UDate newStart = calendar.getTime(status);
450	int32_t newYear = calendar.get(UCAL_YEAR, status);
451	{
452	umtx_lock(NULL);
453	fgSystemDefaultCenturyStart = newStart;
454	fgSystemDefaultCenturyStartYear = newYear;
455	umtx_unlock(NULL);
456	}
457	}
458	// We have no recourse upon failure unless we want to propagate the failure
459	// out.
460	}
461	}
462
463	UOBJECT_DEFINE_RTTI_IMPLEMENTATION(PersianCalendar)
464
465	U_NAMESPACE_END
466
467	#endif
468