MonetaryQuery

Similar to MonetaryOperator, MonetaryQuery is a functional interface that accepts a MonetaryOperator and returns a generic type-parameter. With MonetaryQuery you can perform some queries on the monetary value such as getting the currency code or the numeric value as shown in the example below.

public class MonetaryQueryExamples {

    public static void main(String[] args) {
        MonetaryQuery<Long> longQuery = m -> m.getNumber().longValue();
        MonetaryQuery<String> currencyCodeQuery = m -> m.getCurrency().getCurrencyCode();
        MonetaryQuery<Integer> fractionDigits = m -> m.getCurrency().getDefaultFractionDigits();


    }
}

There are two ways for applying MonetaryQuery, you could either call MonetaryQuery.queryFrom or MonetaryAmount.query as shown below

public class HelloMonetaryQuery {

    public  static void main(String[] args) {
        CurrencyUnit currency = Monetary.getCurrency("BRL");
        MonetaryAmount money = FastMoney.of(10, currency);
        MonetaryQuery<String> currencyCodeQuery = m -> m.getCurrency().getCurrencyCode();
        String result = currencyCodeQuery.queryFrom(money);//BRL
        String result2 = money.query(currencyCodeQuery);//BRL
    }
}

Moneta provides implementations of MonetaryQuery and MonetaryQueries provide factory methods for creating instances of type MonetaryQuery:

• MonetaryQuery<Long> extractMajorPart() returns the major part of a money , for example, EUR 2.35 returns 2.
• MonetaryQuery<Long> convertMinorPart() converts the money amount into its full value in cents, for example USD 2.35 becomes 235.

public class MonetaryQueriesExample {

    public static void main(String[] args) {
        CurrencyUnit currency = Monetary.getCurrency(Locale.US);

        MonetaryAmount money = Money.of(120.23, currency);
        Long moneyInCents = money.query(MonetaryQueries.convertMinorPart());//12023
        Long majorPart = money.query(MonetaryQueries.extractMajorPart());//120
        Long minorPart = money.query(MonetaryQueries.extractMinorPart());//23
    }
}