/*
******************************************************************************
* Copyright (C) 2003-2012, 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
* 10/1/2012 roozbeh Fixed algorithm and heavily refactored and rewrote
* based on the implementation of Gregorian
*****************************************************************************
*/
#include "persncal.h"
#if !UCONFIG_NO_FORMATTING
#include "umutex.h"
#include "gregoimp.h" // Math
#include <float.h>
static const int16_t kPersianNumDays[]
= {0,31,62,93,124,155,186,216,246,276,306,336}; // 0-based, for day-in-year
static const int8_t kPersianMonthLength[]
= {31,31,31,31,31,31,30,30,30,30,30,29}; // 0-based
static const int8_t kPersianLeapMonthLength[]
= {31,31,31,31,31,31,30,30,30,30,30,30}; // 0-based
static const int32_t kPersianCalendarLimits[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
};
U_NAMESPACE_BEGIN
static const int32_t PERSIAN_EPOCH = 1948320;
// 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
//-------------------------------------------------------------------------
int32_t PersianCalendar::handleGetLimit(UCalendarDateFields field, ELimitType limitType) const {
return kPersianCalendarLimits[field][limitType];
}
//-------------------------------------------------------------------------
// Assorted calculation utilities
//
/**
* Determine whether a year is a leap year in the Persian calendar
*/
UBool PersianCalendar::isLeapYear(int32_t year)
{
int32_t remainder;
ClockMath::floorDivide(25 * year + 11, 33, remainder);
return (remainder < 8);
}
/**
* Return the day # on which the given year starts. Days are counted
* from the Persian epoch, origin 0.
*/
int32_t PersianCalendar::yearStart(int32_t year) {
return handleComputeMonthStart(year,0,FALSE);
}
/**
* Return the day # on which the given month starts. Days are counted
* from the Persian epoch, origin 0.
*
* @param year The Persian year
* @param year The Persian month, 0-based
*/
int32_t PersianCalendar::monthStart(int32_t year, int32_t month) const {
return handleComputeMonthStart(year,month,TRUE);
}
//----------------------------------------------------------------------
// Calendar framework
//----------------------------------------------------------------------
/**
* Return the length (in days) of the given month.
*
* @param year The Persian year
* @param year The Persian month, 0-based
*/
int32_t PersianCalendar::handleGetMonthLength(int32_t extendedYear, int32_t month) const {
// If the month is out of range, adjust it into range, and
// modify the extended year value accordingly.
if (month < 0 || month > 11) {
extendedYear += ClockMath::floorDivide(month, 12, month);
}
return isLeapYear(extendedYear) ? kPersianLeapMonthLength[month] : kPersianMonthLength[month];
}
/**
* Return the number of days in the given Persian year
*/
int32_t PersianCalendar::handleGetYearLength(int32_t extendedYear) const {
return isLeapYear(extendedYear) ? 366 : 365;
}
//-------------------------------------------------------------------------
// 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 += ClockMath::floorDivide(month, 12, month);
}
int32_t julianDay = PERSIAN_EPOCH - 1 + 365 * (eyear - 1) + ClockMath::floorDivide(8 * eyear + 21, 33);
if (month != 0) {
julianDay += kPersianNumDays[month];
}
return julianDay;
}
//-------------------------------------------------------------------------
// 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.
*/
void PersianCalendar::handleComputeFields(int32_t julianDay, UErrorCode &/*status*/) {
int32_t year, month, dayOfMonth, dayOfYear;
int32_t daysSinceEpoch = julianDay - PERSIAN_EPOCH;
year = 1 + ClockMath::floorDivide(33 * daysSinceEpoch + 3, 12053);
int32_t farvardin1 = 365 * (year - 1) + ClockMath::floorDivide(8 * year + 21, 33);
dayOfYear = (daysSinceEpoch - farvardin1); // 0-based
if (dayOfYear < 216) { // Compute 0-based month
month = dayOfYear / 31;
} else {
month = (dayOfYear - 6) / 30;
}
dayOfMonth = dayOfYear - kPersianNumDays[month] + 1;
++dayOfYear; // Make it 1-based now
internalSet(UCAL_ERA, 0);
internalSet(UCAL_YEAR, year);
internalSet(UCAL_EXTENDED_YEAR, year);
internalSet(UCAL_MONTH, month);
internalSet(UCAL_DAY_OF_MONTH, dayOfMonth);
internalSet(UCAL_DAY_OF_YEAR, dayOfYear);
}
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.
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);
if (fgSystemDefaultCenturyStart == fgSystemDefaultCentury)
{
fgSystemDefaultCenturyStartYear = newYear;
fgSystemDefaultCenturyStart = newStart;
}
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