/**
* Iterates a collection, and sums the Money elements contained in the specified property of each
* object.
*
* <p>Nulls are excluded from the addition.
*
* @param <T> Type of elements in the collection.
* @param collection Collection to iterate.
* @param clazz Type of elements in the collection.
* @param property Name of the property that contains the money element.
* @param currency Currency of the money elements.
* @return Returns the sum.
*/
public static <T> Money sum(
Collection<T> collection, Class<T> clazz, String property, Currency currency) {
PropertyDescriptor pd = JavaBeanUtils.getPropertyDescriptor(clazz, property);
MoneyCalculator calc = new MoneyCalculator(currency, false);
for (T t : collection) {
Money money = (Money) JavaBeanUtils.getProperty(pd, t);
if (money != null) {
calc.add(money);
}
}
return calc.getResult();
}
/**
* Calculates a {@link Money} field that is calculated as a percentage of another money field in a
* collection of elements . <br>
* This method iterates a collection and sets a new value to a specified property of each element.
* The new value is the result of a calculation. <br>
* The calculation of each row takes into account the remainder that was created by the rounding
* that took place during the previous calculation, due to rounding the result to the decimal
* digits defined by the currency. <br>
*
* @param collection Collection with the elements.
* @param clazz Class of each element in the collection.
* @param prc Percentage being applied on the calculation.
* @param amountProperty Name of the property that produces the base amount for the calculation.
* @param calculatedProperty Name of the property that is filled with the result of the
* calculation.
* @param currency Currency.
* @param <T> Type of elements in the collection.
*/
public static <T> void calcPercentage(
Collection<T> collection,
Class<T> clazz,
BigDecimal prc,
String amountProperty,
String calculatedProperty,
Currency currency) {
PropertyDescriptor amountPd = JavaBeanUtils.getPropertyDescriptor(clazz, amountProperty);
PropertyDescriptor calculatedPd =
JavaBeanUtils.getPropertyDescriptor(clazz, calculatedProperty);
MoneyCalculator calc = new MoneyCalculator(currency, true);
for (T t : collection) {
Money amount = (Money) JavaBeanUtils.getProperty(amountPd, t);
if (amount != null) {
calc.set(amount);
Money calculated = calc.multiply(prc);
JavaBeanUtils.setProperty(calculatedPd, calculated, t);
}
}
}
