private function sortDesc($object1, $object2)
{
$fieldValue1 = strtolower($object1->{$this->currentSortingFieldGetter}());
$fieldValue2 = strtolower($object2->{$this->currentSortingFieldGetter}());
if ($fieldValue1 == $fieldValue2) {
return 0;
}
return $fieldValue1 > $fieldValue2 ? -1 : +1;
}