code: public static URI makeFileLoggerURL(File dataDir, File dataLogDir){
          return URI.create(makeURIString(dataDir.getPath(),dataLogDir.getPath(),null));
      }
docs: Given two directory files the method returns a well-formed
  logfile provider URI. This method is for backward compatibility with the
  existing code that only supports logfile persistence and expects these two
  parameters passed either on the command-line or in the configuration file.
  
  @param dataDir snapshot directory
  @param dataLogDir transaction log directory
  @return logfile provider URI