Trying to solve a use case in Guice that's similar to Robot Legs, but the
existing solutions don't seem to map.
Use case (code below):
- Have an existing Robot class with @Injected constructor that takes a
RobotHeart
- Have existing RobotModule that provides a set of bindings for robot parts,
including a binding for RobotHeart
- Can't modify RobotModule or Robot
- I want to be able to inject a Robot instance with a different RobotHeart
binding, i.e.
@Inject @TitaniumHeart Robot;
creates a robot with a different injected heart.
The PrivateModule solution doesn't seem to work, because it would create a
duplicate key for RobotHeart.class and duplicate keys aren't allowed.
Any thoughts on how to implement?
Evan
Example:
public static void main(String[] args) {
// This works
Injector i = Guice.createInjector(new RobotModule());
Robot robby = i.getInstance(Robot.class);
System.out.println("Heart: " + robby.heart.type);
// Unsure how to make this work
Injector i2 = Guice.createInjector(????); // Tried PrivateModule,
override modules and can't make it work cleanly
Robot titaniumRobby = i.getInstance(Key.get(Robot.class,
Titanium.class));
System.out.println("Heart: " + titaniumRobby.heart.type);
}
public static class RobotModule extends AbstractModule {
@Override
protected void configure() {}
@Provides
public RobotHeart provideRobotHeart() {
return new RobotHeart("standard");
}
// + a lot more here
}
public static class Robot {
public final RobotHeart heart;
@Inject
public Robot(RobotHeart heart) {
// Also simplified for the example, would be a more complex
constructor
this.heart = heart;
}
}
public static class RobotHeart {
public final String type;
public RobotHeart(String type) {
this.type = type;
}
}
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