public function addTo(Temporal $temporal, $amount)
{
switch ($this) {
case IsoFields::WEEK_BASED_YEARS():
return $temporal->with(IsoFields::WEEK_BASED_YEAR(), Math::addExact($temporal->get(IsoFields::WEEK_BASED_YEAR()), $amount));
case IsoFields::QUARTER_YEARS():
// no overflow (256 is multiple of 4)
return $temporal->plus($amount / 256, ChronoUnit::YEARS())->plus($amount % 256 * 3, ChronoUnit::MONTHS());
default:
throw new IllegalStateException("Unreachable");
}
}
public function adjustInto(Temporal $temporal, $newValue)
{
// Check the new value and get the old value of the field
$newVal = $this->range->checkValidIntValue($newValue, $this);
// lenient check range
$currentVal = $temporal->get($this);
if ($newVal === $currentVal) {
return $temporal;
}
if ($this->rangeUnit == ChronoUnit::FOREVER()) {
// replace year of WeekBasedYear
// Create a new date object with the same chronology,
// the desired year and the same week and dow.
$idow = $temporal->get($this->weekDef->dayOfWeek);
$wowby = $temporal->get($this->weekDef->weekOfWeekBasedYear);
return $this->ofWeekBasedYear(AbstractChronology::from($temporal), $newValue, $wowby, $idow);
} else {
// Compute the difference and add that using the base unit of the field
return $temporal->plus($newVal - $currentVal, $this->baseUnit);
}
}
