3.0: Assisted Inject and MapBinder

[kimchy]

Hi,

  Wondering how to use the new assisted inject with MapBinder, now that FactoryProvider is deprecated? For example, how to code this: mapBinder.addBinding(name).toProvider(FactoryProvider...) ?

cheers,

-shay.banon

[Fred Faber]

To solve this you're able to bind the Factory using FactoryModule builder, and then add it to the map.

class Car {

  @Inject Car(@Assisted Color color) { ...}

  interface CarFactory {

     Car create(Color color);

  }

}

And let's say you want a map that gives you:

 "green" => new Car(Color.GREEN)

 "blue" => new Car(Color.BLUE)

install(new FactoryModuleBuilder().

   .build(Key.get(CarFactory.class, Names.named("CreatesGreenCars"));

install(new FactoryModuleBuilder().

   .build(Key.get(CarFactory.class, Names.named("CreatesBlueCars"));

MapBinder<Color, CarFactory> mapBinder =

  MapBinder.newMapBinder(binder(), Color.class, CarFactory.class);

mapBinder.addBinding(Color.GREEN)

  .to(Key.get(CarFactory.class, Names.named("CreatesGreenCars"));

mapBinder.addBinding(Color.BLUE)

  .to(Key.get(CarFactory.class, Names.named("CreatesBlueCars"));

That will give you what you're looking for, I believe.

There's some boilerplate that a method or two could reduce e.g., Key getKey(Color color) { ...}

-Fred

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[Fred Faber]

Actually, my initial example was a bit different than the one I wrote.

I don't see a reason to create the different bindings for the Factories.  Just add a single binding, then use it as values for several entries in the map.

Fred

[Leigh Klotz]

This thread might help:
<http://groups.google.com/group/google-guice/browse_thread/thread/
7f51af1f3860205d/bf1fff0b4dd4dbad#bf1fff0b4dd4dbad>