code: public static void notNegative(Double value) {
  		if(!validation) return;
  		notNull(value);
  		if(value < 0)
  			throw new ParameterException(ErrorCode.NEGATIVE);
  	}
docs: Checks if the given double is NOT negative.
  @param value The double value to validate.
  @throws ParameterException if the given double value is <code>null</code> or smaller than 0.