public static function getOwners($user_id, $permission = null)
{
$permission_array = array(Calendar::PERMISSION_READABLE, Calendar::PERMISSION_WRITABLE);
if (!$permission) {
$permission = $permission_array;
} else {
if (!in_array($permission, $permission_array)) {
throw new InvalidArgumentException('Calendar permission must be of type PERMISSION_READABLE or PERMISSION_WRITABLE.');
} else {
$permission = array($permission);
}
}
return SimpleORMapCollection::createFromArray(CalendarUser::findBySQL('user_id = ? AND permission IN(?)', array($user_id, $permission)));
}
