How to convert Java `Consumer` to Groovy `Closure`?

Question

I have some Java code that needs to call a Groovy API that takes a Closure as a parameter. How do I go about converting a Java Consumer to a Groovy Closure ? The code looks something like:

final Consumer<Example> consumer = (Example e) -> {
  e.doSomething();
};
someGroovyApi(convertConsumerToClosure(consumer));

Answer 1

Rather than trying to convert the Consumer into a Closure , just create the equivalent Closure , something like:

new Closure<Example>(outerObject) {
  public Example call(final Object o) {
    final Example e = (Example) o;

    e.doSomething();

    return e;
  }
}

Answer 2

You can use MethodClosure to convert a Consumer (or any other functional interface) to a Closure .

Closure closure = new MethodClosure(consumer, "accept");