ActivityMapper with GIN

I have been working with Activities and Places to develop an application in GWT.

I'm fairly pleased with how it's going so far, but I'm struggling to find a nice way to make my ActivityMapper work with GIN.

Here is some example code for my activity mapper

public class MyActivityMapper implements ActivityMapper {

private ClientFactory clientFactory;

@Inject

private Provider<TestActivity> provider;

@Inject

public MyActivityMapper(ClientFactory clientFactory) {

super();

this.clientFactory = clientFactory;

}

@Override

public Activity getActivity(final Place place) {

if (place instanceof TestPlace) {

TestActivity activity = provider.get().withPlace((TestPlace)place);

return activity;

}

        return null;

}

}

The provider allows the activity to be injected with the it's various dependencies, including the view, configured in the GinModule. It's all works quite nicely, but the mapper gets a little cumbersome as more and more activities are added to the application.

Does anyone have any suggestions to reduce the amount of "instanceof" boiler plate code?

Many thanks

Tom

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