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 getRangeUnit()
{
return IsoFields::WEEK_BASED_YEARS();
}
public function rangeRefinedBy(TemporalAccessor $temporal)
{
if ($this->rangeUnit == ChronoUnit::WEEKS()) {
// day-of-week
return $this->range;
} else {
if ($this->rangeUnit == ChronoUnit::MONTHS()) {
// week-of-month
return $this->rangeByWeek($temporal, CF::DAY_OF_MONTH());
} else {
if ($this->rangeUnit == ChronoUnit::YEARS()) {
// week-of-year
return $this->rangeByWeek($temporal, CF::DAY_OF_YEAR());
} else {
if ($this->rangeUnit == IsoFields::WEEK_BASED_YEARS()) {
return $this->rangeWeekOfWeekBasedYear($temporal);
} else {
if ($this->rangeUnit == ChronoUnit::FOREVER()) {
return CF::YEAR()->range();
} else {
throw new IllegalStateException("unreachable, rangeUnit: " . $this->rangeUnit . ", this: " . $this);
}
}
}
}
}
}
