/**
* comparator to sort the {@link MonetaryAmount} considering the {@link ExchangeRate}
*
* @param provider the rate provider to be used, not null.
* @return the sort of {@link MonetaryAmount} using {@link ExchangeRate}
*/
public static Comparator<? super MonetaryAmount> sortValuable(ExchangeRateProvider provider) {
return (m1, m2) -> {
CurrencyConversion conversion = provider.getCurrencyConversion(m1.getCurrency());
return m1.compareTo(conversion.apply(m2));
};
}
/**
* return the maximum value, if the monetary amounts have different currencies, will converter
* first using the given ExchangeRateProvider
*
* @param provider the ExchangeRateProvider to convert the currencies
* @return the maximum value
*/
public static BinaryOperator<MonetaryAmount> max(ExchangeRateProvider provider) {
return (m1, m2) -> {
CurrencyConversion conversion = provider.getCurrencyConversion(m1.getCurrency());
if (m1.isGreaterThan(conversion.apply(m2))) {
return m1;
}
return m2;
};
}
/**
* return the sum and convert all values to specific currency using the provider, if necessary
*
* @param provider the rate provider to be used, not null.
* @param currency currency
* @return the list convert to specific currency unit
*/
public static BinaryOperator<MonetaryAmount> sum(
ExchangeRateProvider provider, CurrencyUnit currency) {
CurrencyConversion currencyConversion = provider.getCurrencyConversion(currency);
return (m1, m2) -> currencyConversion.apply(m1).add(currencyConversion.apply(m2));
}