While back, I did something like this, I think I have missed something but I
hope I have not.
Instead of binding to Map<String, IFoo>, bind it to Map<String, IFooFactory>
where IFooFactory returns an implementation of IFoo based on String input.
In your class, that requires IFoo, you need to inject the Map<String,
IFooFactory>
So you will have
interface IFooFactory {
IFoo create(String type);
}
In your module, you will have
bind("typeA").toProvider(FactoryProvider.newFactory(IFooFactory.class,
FooOne.class));
So in your class,
public class FooOne {
@AssistedInject
public FooOne(@Assisted String name) {
....
}
}
public class FooMap {
@Inject
public FooMap(Map<String, IFooFactory> factories) {
this.factories = factories;
}
public void doSomething(String type) {
Foo foo = factories.get(type).create(type);
}
}
On Wed, May 26, 2010 at 4:24 PM, KreeK <[email protected]> wrote:
> Is possible to combine MapBinder and Assisted Injection?
>
> I have a MapBinder as below in my Module:
>
> MapBinder<String, IFoo> mapBinder =
> MapBinder.newMapBinder(binder(), String.class,
> IFoo.class);
>
> mapBinder.addBinding(Bar.ONE).to(FooOne.class);
> mapBinder.addBinding(Bar.TWO).to(FooTwo.class);
>
> This works great and the IFoo implementations can be retrieved like
> so:
>
> private final Map<String, IFoo> foos;
>
> @Inject
> public FooMap(Map<String, ICommand> foos) {
> this.foos = foos;
> }
>
> public void doSomething(IBar b) {
> IFoo foo = foos.get(b.getType());
> foo.execute();
> }
>
> I'd like to have the parameter of the 'doSomething' method be
> @Assisted into the Foo that comes out of the map. I think you can do
> it with a FactoryProvider for each IFoo implementation. Is it possible
> to have a single FactoryProvider handle the creation. Could I inject
> the foos map in a Factory and have them come out with an @Assisted
> IBar instance in them?
>
> thanks!
>
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