code: public static boolean isEnabled (@Nonnull final Logger aLogger, @Nonnull final IHasErrorLevel aErrorLevelProvider)
    {
      return isEnabled (aLogger, aErrorLevelProvider.getErrorLevel ());
    }
docs: Check if logging is enabled for the passed logger based on the error level
  provider by the passed object
  
  @param aLogger
  The logger. May not be <code>null</code>.
  @param aErrorLevelProvider
  The error level provider. May not be <code>null</code>.
  @return <code>true</code> if the respective log level is allowed,
  <code>false</code> if not