Binding Property

[Jochen Wiedmann]

Hi,


suggest the following field:


    private @Driver @Inject Seat seat;


and the following bindings:


    pBinder.bind(Seat.class).toClass(DefaultSeat.class);
    pBinder.bind(Seat.class).annotatedWith(Driver.class).toClass(DriversSeat.class);


What would be the type of seat? I would hope for a DriversSeat, but that assumes a priority of bindings, that I am unaware of. Is there something like that?

Thanks,

Jochen

[Thomas Broyer]

If I'm not mistaken, you'd have an error if you didn't have the second binding: because @Driver is a @BindingAnnotation or @Qualifier, Guice will refuse to inject the field if it hasn't been configured with a binding for "Seat annotated with @Driver" (it won't even inject a Seat instance if Seat is default-instantiable or is annotated with @ImplementedBy or @ProvidedBy).

So there's no need for priorities: the "Seat" key is distinct from the "@Driver Seat" one.

[Jochen Wiedmann]

Thanks for your reply, Thomas. In particular, I wasn't aware of the necessity to use @BindingAnnotation. But, lets assume that the annotation is present on the @Driver class. If so, my example becomes valid. And, indeed, Guice does create an instance of DriversSeat, rather than DefaultSeat.

Jochen

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