code: public static void positive(Long value) {
  		if(!validation) return;
  		notNull(value);
  		if(value <= 0)
  			throw new ParameterException(ErrorCode.NOTPOSITIVE);
  	}
docs: Checks if the given long value is positive.
  @param value The long value to validate.
  @throws ParameterException if the given long value is <code>null</code> or smaller/equal to 0.