I would strongly discourage making production code aware of wiring logic. The module is there for this purpose.
Dhanji. On Thu, Feb 19, 2009 at 5:41 AM, Leigh Klotz <[email protected]> wrote: > > If your application is not exactly as described, but slightly more > complex and you need to map between myAnimal descriptions multiple > times, not just once, you might consider a Mapbinder. It's similar to > your custom provider solution, but eliminates inline if/else code, and > promotes extension by addition in other modules, since all MapBinder > additions to a given type pair are shared. > > class Barn { > @Inject Map<String, Animal> animals; > void foo(String name) { > Animal animal = animals.get(name); > ... > } > > } > > import com.google.inject.multibindings.MapBinder; > > class MyModule extends AbstractModule { > private void defanimal(MapBinder<String, Animal>m, String name, > Class<? extends Animal> c) { > m.addBinding(name).to(c); > } > > public void configure() { > MapBinder<String, Animal> m = MapBinder.newMapBinder(binder(), > String.class, Animal.class); > defanimal(m, "cow", Cow.class); > defanimal(m, "goat", Goat.class); > } > > } > > Leigh. > > On Feb 17, 4:25 pm, Jonathan Dray <[email protected]> wrote: >> Hi, >> >> I'm using Guice for DI in one of my projects. >> I need to choose the right class to inject depending on the value of a >> property read in a properties file. >> Here is a small exemple of what I want to do : >> >> Class myFarm { >> @Inject >> public myFarm(Animal animal) { >> } >> >> } >> >> Now I want that the Animal injected here should be an instance of a >> "Cow" or a "Goat" (which implements the Animal Interface) mapped from >> the property "myAnimal" read in my application property file. >> >> I thought about two solutions : >> >> 1. use a custom provider to get an animal which takes the value of the >> property as a parameter. >> 2. In the configure method of my Guice Module instance, read the >> property and add a binding depending on the value. >> >> Do I have any other alternative with Guice ? >> Which of these method would you chose in that case ? >> >> Thanks for your help. >> Regards, >> Jonathan Dray > > > --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "google-guice" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/google-guice?hl=en -~----------~----~----~----~------~----~------~--~---
