Adding the same class multiple times into multibinder with different binding parameters.

[Jia Pu]

Let's same I have an abstract class with several subclasses:

public abstract AbstractFoo { }

public FooA extends AbstractFoo {}

public FooB extends AbstractFoo {}

public FooC extends AbstractFoo {}

There's also a class with following injection:

class Bar {

@Inject

public Bar(Foo foo) { }

}

Is it possible to add Bar multiple times into multibinder with different concrete Foo classes?

Multibinder<Bar> binder = Multibinder.newSetBinder(binder(), new Bar.class);

binder.addBinding .... // Now what?

Or did I completely miss the point of Guice here? I'm new to java world, BTW.

[Armin Bahramshahry]

Take a look at @Named, https://code.google.com/p/google-guice/wiki/BindingAnnotations, I believe that's what you wanna do

[Jia Pu]

I did try to achieve my goal using annotation. It works. But I wonder if there's more concise way. My current solution is:

class BarA extends Bar {

@Inject

public Bar(@Named("A") Foo foo) { }

}

class BarB extends Bar {

@Inject

public Bar(@Named("B") Foo foo) { }

}

Then in the module:

bind(AbstractFoo.class).annotatedWith(Names.named("A")).to(FooA.class);

bind(AbstractFoo.class).annotatedWith(Names.named("B")).to(FooB.class);

Multibinder<Bar> binder = Multibinder.newSetBinder(binder(), new Bar.class);

binder.addBinding().to(BarA.class);

binder.addBinding().to(BarB.class);

The problem here is that I need to create two dummy subclass, BarA and BarB, in order to utilize annotation. I wonder if there's a way to reduce this sort of boilerplate code.

[Stephan Classen]

you can achieve the same result with private modules. Then you don't have to create the dummy classes.
see: https://groups.google.com/forum/#!topic/google-guice/h70a9pwD6_g

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