/**
* Compares award receipts by 'year' received, or by award 'title'
* @param InternalAwardReceipt $ar
* @param unknown_type $compare_by
* @return number
*/
public function compare($ar, $compare_by = "year")
{
switch ($compare_by) {
case 'year':
return $this->year == $ar->year ? 0 : ($this->year > $ar->year ? 1 : -1);
break;
case 'title':
$award = $this->getAward();
$other_award = $ar->getAward();
return $award->compare($other_award);
break;
}
}
