/**
* Return JD of start of given month/year.
* @internal
*/
int32_t HebrewCalendar::handleComputeMonthStart(int32_t eyear, int32_t month, UBool /*useMonth*/) const {
UErrorCode status = U_ZERO_ERROR;
// Resolve out-of-range months. This is necessary in order to
// obtain the correct year. We correct to
// a 12- or 13-month year (add/subtract 12 or 13, depending
// on the year) but since we _always_ number from 0..12, and
// the leap year determines whether or not month 5 (Adar 1)
// is present, we allow 0..12 in any given year.
while (month < 0) {
month += monthsInYear(--eyear);
}
// Careful: allow 0..12 in all years
while (month > 12) {
month -= monthsInYear(eyear++);
}
int32_t day = startOfYear(eyear, status);
if(U_FAILURE(status)) {
return 0;
}
if (month != 0) {
if (isLeapYear(eyear)) {
day += LEAP_MONTH_START[month][yearType(eyear)];
} else {
day += MONTH_START[month][yearType(eyear)];
}
}
return (int) (day + 347997);
}
/**
* Returns the length of the given month in the given year
* @internal
*/
int32_t HebrewCalendar::handleGetMonthLength(int32_t extendedYear, int32_t month) const {
// Resolve out-of-range months. This is necessary in order to
// obtain the correct year. We correct to
// a 12- or 13-month year (add/subtract 12 or 13, depending
// on the year) but since we _always_ number from 0..12, and
// the leap year determines whether or not month 5 (Adar 1)
// is present, we allow 0..12 in any given year.
while (month < 0) {
month += monthsInYear(--extendedYear);
}
// Careful: allow 0..12 in all years
while (month > 12) {
month -= monthsInYear(extendedYear++);
}
switch (month) {
case HESHVAN:
case KISLEV:
// These two month lengths can vary
return MONTH_LENGTH[month][yearType(extendedYear)];
default:
// The rest are a fixed length
return MONTH_LENGTH[month][0];
}
}
// Ok
int KCalendarSystemHebrew::weeksInYear(int year) const
{
TQDate temp;
setYMD(temp, year, 1, 1); // don't pass an uninitialized TQDate to
// monthsInYear in the next call
setYMD(temp, year, monthsInYear(temp), hndays(monthsInYear(temp), year) );
int nWeekNumber = weekNumber(temp);
if(nWeekNumber == 1) // last week belongs to next year
{
temp = TQT_TQDATE_OBJECT(temp.addDays(-7));
nWeekNumber = weekNumber(temp);
}
return nWeekNumber;
}
int KCalendarSystem::daysInMonth( const QDate &date ) const
{
// Days In Month = jd of first day of next month minus jd of first day of this month
// Use setAnyDate() to allow correct calculation in last valid year
if ( isValid( date ) ) {
QDate firstDayOfThisMonth, firstDayOfNextMonth;
int thisYear = year( date );
int thisMonth = month( date );
setDate( firstDayOfThisMonth, thisYear, thisMonth, 1 );
//check if next month falls in next year
if ( thisMonth < monthsInYear( date ) ) {
setDate( firstDayOfNextMonth, thisYear, thisMonth + 1, 1 );
} else {
d->setAnyDate( firstDayOfNextMonth, thisYear + 1, 1, 1 );
}
return ( firstDayOfNextMonth.toJulianDay() - firstDayOfThisMonth.toJulianDay() );
}
return -1;
}
/**
* Rolls (up/down) a specified amount time on the given field. For
* example, to roll the current date up by three days, you can call
* <code>roll(Calendar.DATE, 3)</code>. If the
* field is rolled past its maximum allowable value, it will "wrap" back
* to its minimum and continue rolling.
* For example, calling <code>roll(Calendar.DATE, 10)</code>
* on a Hebrew calendar set to "25 Av 5758" will result in the date "5 Av 5758".
* <p>
* When rolling certain fields, the values of other fields may conflict and
* need to be changed. For example, when rolling the {@link #MONTH MONTH} field
* upward by one for the date "30 Av 5758", the {@link #DAY_OF_MONTH DAY_OF_MONTH} field
* must be adjusted so that the result is "29 Elul 5758" rather than the invalid
* "30 Elul".
* <p>
* This method is able to roll
* all fields except for {@link #ERA ERA}, {@link #DST_OFFSET DST_OFFSET},
* and {@link #ZONE_OFFSET ZONE_OFFSET}. Subclasses may, of course, add support for
* additional fields in their overrides of <code>roll</code>.
* <p>
* <b>Note:</b> You should always use roll and {@link #add add} rather
* than attempting to perform arithmetic operations directly on the fields
* of a <tt>HebrewCalendar</tt>. Since the {@link #MONTH MONTH} field behaves
* discontinuously in non-leap years, simple arithmetic can give invalid results.
* <p>
* @param field the time field.
* @param amount the amount by which the field should be rolled.
*
* @exception IllegalArgumentException if the field is invalid or refers
* to a field that cannot be handled by this method.
* @internal
*/
void HebrewCalendar::roll(UCalendarDateFields field, int32_t amount, UErrorCode& status)
{
if(U_FAILURE(status)) {
return;
}
switch (field) {
case UCAL_MONTH:
{
int32_t month = get(UCAL_MONTH, status);
int32_t year = get(UCAL_YEAR, status);
UBool leapYear = isLeapYear(year);
int32_t yearLength = monthsInYear(year);
int32_t newMonth = month + (amount % yearLength);
//
// If it's not a leap year and we're rolling past the missing month
// of ADAR_1, we need to roll an extra month to make up for it.
//
if (!leapYear) {
if (amount > 0 && month < ADAR_1 && newMonth >= ADAR_1) {
newMonth++;
} else if (amount < 0 && month > ADAR_1 && newMonth <= ADAR_1) {
newMonth--;
}
}
set(UCAL_MONTH, (newMonth + 13) % 13);
pinField(UCAL_DAY_OF_MONTH, status);
return;
}
default:
Calendar::roll(field, amount, status);
}
}
QDate KCalendarSystem::addMonths( const QDate &date, int numMonths ) const
{
if ( isValid( date ) ) {
int originalYear, originalMonth, originalDay;
int newYear, newMonth, newDay;
int monthsInOriginalYear, daysInNewMonth;
QDate firstOfNewMonth, newDate;
julianDayToDate( date.toJulianDay(), originalYear, originalMonth, originalDay );
monthsInOriginalYear = monthsInYear( date );
newYear = originalYear + ( ( originalMonth + numMonths ) / monthsInOriginalYear );
newMonth = ( originalMonth + numMonths ) % monthsInOriginalYear;
if ( newMonth == 0 ) {
newYear = newYear - 1;
newMonth = monthsInOriginalYear;
}
if ( newMonth < 0 ) {
newYear = newYear - 1;
newMonth = newMonth + monthsInOriginalYear;
}
//Adjust day number if new month has fewer days than old month
if ( setDate( firstOfNewMonth, newYear, newMonth, 1 ) ) {
daysInNewMonth = daysInMonth( firstOfNewMonth );
newDay = ( daysInNewMonth < originalDay ) ? daysInNewMonth : originalDay;
if ( setDate( newDate, newYear, newMonth, newDay ) ) {
return newDate;
}
}
}
//Is QDate's way of saying is invalid
return QDate::fromJulianDay( 0 );
}
