Method checkFraction

src/main/java/com/amazon/ion/Timestamp.java:2949–2963

(Precision precision, BigDecimal fraction)

    }

    private static Precision checkFraction(Precision precision, BigDecimal fraction)
    {
        if (precision.includes(Precision.SECOND)) {
            if (fraction != null && (fraction.signum() == -1 || BigDecimal.ONE.compareTo(fraction) != 1)) {
                throw new IllegalArgumentException(String.format("Fractional seconds %s must be greater than or equal to 0 and less than 1", fraction));
            }
        }
        else {
            if (fraction != null) {
                throw new IllegalArgumentException("Fraction must be null for non-second precision: " + fraction);
            }
        }

        return precision;
    }
}