Eliminating GWT ActivityMapper boilerplate

Question

I am using the GWT Activities and Places framework to structure my application and it is turning out nicely. One thing that annoys me though is that the ActivityMapper

Answer 1

Actually I am using custom boilerplate code for this task:

public class PuksaActivityMapper implements ActivityMapper {
private HashMap mappings;

@Inject
private SearchResultActivityContainer searchResultContainer;
@Inject
private HelloActivityContainer helloContainer;

@Override
public Activity getActivity(Place place) {
    ActivityContainer container = getMappings().get(place.getClass().getName());

    return container.getActivity(place);
}

public HashMap getMappings() {
    if (mappings == null) {
        mappings = new HashMap();

        mappings.put(ShowResultsPlace.class.getName(), searchResultContainer);
        mappings.put(HelloPlace.class.getName(), helloContainer);
    }
    return mappings;
}

}

Where ActivityContainer is a simple factory type (from this point classic ioc methods can be used).

Of course now it is only changing 'if block' with a map lookup/population, but combined with Gin multibinding (witch currently does not exist) could do it's job.

Also Gin enhancement - generic GinModule for GWT Activity/Places looks promising.