/**
  * Generates a file name for uploaded asset.
  *
  * @param sfValidatedFile $file
  * @return string unique file name.
  */
 public function generateFilenameFilename(sfValidatedFile $file)
 {
     $fs = new lyMediaFileSystem();
     return $fs->generateUniqueFilename($file->getPath(), $file->getOriginalName());
 }