/**
* Casts an DateTimeRange object into DateRange.
*
* @param DateTimeRange $range A DateTimeRange object
*
* @return DateRange
*
* @since 2.0.0
*/
private static function cast(DateTimeRange $range)
{
$start = new Date($range->start());
$end = new Date($range->end());
return new DateRange($start, $end);
}
/**
* Compares two objects.
*
* @param DateTimeRange $a Base object.
* @param DateTimeRange $b Object to compare to.
*
* @return integer
*
* @since 2.0.0
* @throws \InvalidArgumentException
*/
private static function compare(DateTimeRange $a, DateTimeRange $b)
{
if (!$a->interval->equals($b->interval)) {
throw new \InvalidArgumentException('Intervals of ranges are not equal.');
}
if ($a->equals($b)) {
return 0;
}
if ($a->start()->isAfter($b->start())) {
return 1;
}
if ($a->start()->isBefore($b->start()) || $a->end()->isBefore($b->end())) {
return -1;
}
return 1;
}