javax.money

Interface MonetaryOperator

All Known Subinterfaces:

CurrencyConversion, MonetaryRounding

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.

@FunctionalInterface
public interface MonetaryOperator

Represents an operation on a single MonetaryAmount that produces a result of type MonetaryAmount.

Examples might be an operator that rounds the amount to the nearest 1000, or one that performs currency conversion.

There are two equivalent ways of using a MonetaryOperator. The first is to invoke the method on this interface. The second is to use MonetaryAmount.with(MonetaryOperator):

 // these two lines are equivalent, but the second approach is recommended
 monetary = thisOperator.apply(monetary);
 monetary = monetary.with(thisOperator);
 

It is recommended to use the second approach, with(MonetaryOperator), as it is a lot clearer to read in code.

Implementation specification

The implementation must take the input object and apply it. The implementation defines the logic of the operator and is responsible for documenting that logic. It may use any method on MonetaryAmount to determine the result.

The input object must not be altered. Instead, an altered copy of the original must be returned. This provides equivalent, safe behavior for immutable and mutable monetary amounts.

This method may be called from multiple threads in parallel. It must be thread-safe when invoked.

This interface extends java.util.function.UnaryOperator introduced by Java 8.

Version:

0.9

Author:

Werner Keil, Anatole Tresch

Method Summary

Modifier and Type	Method and Description
MonetaryAmount	apply(MonetaryAmount amount) Applies the operator on the given amount.

Method Detail

apply

MonetaryAmount apply(MonetaryAmount amount)

Applies the operator on the given amount.

Parameters:

amount - the amount to be operated on.

Returns:

the applied amount.