Child graph with plus(), modules override and buildTypes

Question

What would be an elegant way to create child graphs using ObjectGraph.plus() with different modules according to the buildType?
I would like to ObjectGraph.plus(new ModuleA()) for buildType A and ObjectGraph.plus(new ModuleB()) for buildType B (with module B overriding module A in my case).
I'm already doing something similar with includes but I can't think of a way to do that with child graphs.

Answer 1

Put a class in each build type folder which has a static method for listing modules.

// In src/release/java:
public class Modules {
  public static Object[] list() {
    return new Object[] {
        new ModuleA()
    };
  }
}

---

// In src/debug/java:
public class Modules {
  public static Object[] list() {
    return new Object[] {
        new ModuleA(),
        new ModuleB()
    };
  }
}

Now when you call .create() or .plus() you can just delegate to these methods:

ObjectGraph.create(Modules.list());

You can see a real-world example of this at http://github.com/JakeWharton/u2020