code: protected static Level toLauncherLoggingLevel(Level level) {
      // ALL -2147483648
      // FINEST 300
      // FINER 400
      // FINE 500
      // CONFIG 700
      // INFO 800
      // WARNING 900
      // SEVERE 1000
      // OFF 2147483647
  
      switch (level.intValue()) {
        case 1000: // SEVERE
          return Level.SEVERE;
  
        case 900: // WARNING
          return Level.WARNING;
  
        case 800: // INFO
        case 700: // CONFIG
        case 500: // FINE
        case 400: // FINER
          return Level.FINE;
  
        case 300: // FINEST
        case -2147483648: // ALL
          return Level.FINEST;
  
        default:  // OFF
          return Level.OFF;
      }
    }
docs: The launcher allows for the following logging levels: "FINEST", "FINE", "INFO", "WARNING",
  "SEVERE".  Since the launcher is unusually chatty, we don't want it to use the same logging
  level as OperaDriver.  Besides, it doesn't have the same logging levels as Java.  This method
  accepts a Java logging level and converts it to something sensible to pass on to the launcher.
  
  @param level the Java logging level
  @return a sensible, non-chatty logging level