/**
* returns the file matching an external_key
*
* @param string $key the external key
* @return file matching the external key
* @author jochum
*/
public static function getFileByExternalKey($key)
{
// get id from file by uri
$fileCriteria = new Criteria();
$fileCriteria->add(FilePeer::EXTERNAL_KEY, $key);
$fileCriteria->addDescendingOrderByColumn(FilePeer::TRACK_ID);
$file = FilePeer::doSelectOne($fileCriteria);
//TODO: ? what about the cardinality of externalkey to file ?
// $files = FilePeer::doSelect($fileCriteria);
// $file=NULL;
// foreach ($files as $key => $value) {
// $file = $value;
// }
return $file;
}