How to use generic class with specific objects in a static context?

Question

I\'m gonna try to explain at my best.

I use Play Framework 2, and I will do a lot of CRUD actions. Some of them will be identitcal, so I\'d like to KISS and DRY so a

Answer 1

(Disclaimer: I have no experience with playframework.)

The following idea might help:

public interface IOpImplementation {
    public static Result list();
    public static Result details(Long id);
    public static Result create();
    public static Result update(Long id);
    public static Result delete(Long id);
}

public abstract class CrudController extends Controller {
    protected static Model.Finder finder = null;
    protected static Form form = null;

    protected static IOpImplementation impl;

    public static Result list() {
        return impl.list();
    }

    public static Result details(Long id) {
        return impl.details(id);
    }
    // other operations defined the same way
}

public class Cities extends CrudController {

    public static Cities() {
        impl = new CitiesImpl();
    }

}

This way you can create a hierarchy of implementations.

(This must be some fancy-named design pattern, but I don't know the name ATM.)