public function deleteFile(StorageFacilityParams $params, $fileid)
    {
        $this->validateFileID($fileid);

        $storagePath = $this->generateStoragePath($params, $fileid);

        if (is_file($storagePath)) {
            if (!@unlink($storagePath)) {
                throw new StorageFacilityException("Cannot delete file '".$storagePath."'");
            } else {
                return true;
            }
        }
    }