Is there a standard way to convert a java.util.function,Consumer into a java.util.function.Function

Question

I have a Consumer that I\'d like to convert into a Function.

I could achieve that by using

public 

        

Answer 1

It looks like you need to adapt a Consumer<T> to a Function<T, R>. You have created a good example of the Adapter Pattern.

[T]he adapter pattern is a software design pattern that allows the interface of an existing class to be used from another interface.

You are letting a Consumer be used from a Function.

I know of no JDK built-in converter between functional interfaces, but this appears to be a good way of applying a standard pattern to solve your problem.

Answer 2

A standard way doesn't exist, but this should do the trick:

Function<T, Void> adapt(final Consumer<T> consumer) {
    return t -> {
        consumer.accept(t);
        return null;
    };
}

This is following the Adapter Pattern mentioned in the accepted answer from @rgettman.