Predicates on Numeric Values

Moneta provides predicates that operate on the numeric value of the MonetaryAmount. These predicates are:

• MonetaryFunctions.isLessThanOrEqualTo(monetaryAmount)
• MonetaryFunctions.isLessThan(monetaryAmount)
• MonetaryFunctions.isGreaterThan(monetaryAmount)
• MonetaryFunctions.isGreaterThanOrEqualTo(monetaryAmount)
• isBetween(MonetaryAmount min, MonetaryAmount max)

public class PredicateMonetaryAmountNumberValue {

    public static void main(String[] args) {
        CurrencyUnit dollar = Monetary.getCurrency("USD");


        MonetaryAmount money = Money.of(10, dollar);
        MonetaryAmount money2 = Money.of(10, dollar);
        MonetaryAmount money3 = Money.of(10, dollar);
        MonetaryAmount money4 = Money.of(9, dollar);
        MonetaryAmount money5 = Money.of(8, dollar);

        List<MonetaryAmount> greaterThanZero = Stream.of(money, money2, money3, money4, money5)
                .filter(MonetaryFunctions.isGreaterThan(Money.zero(dollar)))
                .collect(Collectors.toList());//[USD 10, USD 10, USD 10, USD 9, USD 8]

        boolean hasAnyGreaterThanZero = Stream.of(money, money2, money3, money4, money5)
                .anyMatch(MonetaryFunctions.isGreaterThan(Money.zero(dollar)));//true

        boolean allBetweenZeroAndTen = Stream.of(money, money2, money3, money4, money5)
                .allMatch(MonetaryFunctions.isBetween(Money.zero(dollar),
                        Money.of(BigDecimal.TEN, dollar)));//true

    }
}