@Nullable private File[] listFiles0(IgfsPath path){
  File f=fileForPath(path);
  if (!f.exists())   throw new IgfsPathNotFoundException("Failed to list files (path not found): " + path);
 else   return f.listFiles();
}

@ Nullable private File [ ] listFiles0 ( IgfsPath path ) { File f = fileForPath ( path ) ; if ( ! f . exists ( ) ) throw new IgfsPathNotFoundException ( "Failed to list files (path not found): " + path ) ; else return f . listFiles ( ) ; }
returns an array of file object . under the specific path .
