Extension methods for Optional<E> via Manifold

OptionalExt.java

import java.util.Optional;
import java.util.function.Function;
import java.util.function.Supplier;

import manifold.ext.api.Extension;
import manifold.ext.api.This;

/**
 * Extends {@link Optional<T>} with two new methods for acquiring values. 
 */
@Extension
public class OptionalExt {
	
    public <T, R> R applyOrGet(@This Optional<T> optional, Function<T, R> function, Supplier<R> supplier) {
		if (optional.isPresent())
			return function.apply(optional.get());
		else return supplier.get();
    }

    public  <T, R> R applyOrReturn(@This Optional<T> optional, Function<T, R> function, R value) {
		if (optional.isPresent())
			return function.apply(optional.get());
		else return value;
    }
}