code: String scanForDriver(String url) {
      try {
        // already registered
        Driver driver;
        if ((driver = findRegisteredDriver(url)) != null) {
          return driver.getClass().getCanonicalName();
        }
  
        scanDrivers();
  
        if ((driver = findRegisteredDriver(url)) != null) {
          return driver.getClass().getCanonicalName();
        }
  
        return null;
      } catch (Exception e) {
        e.printStackTrace();
        debug(e.toString());
        return null;
      }
    }
docs: Looks for a driver with a particular URL. Returns the name of the class
  if found, null if not found.