Builder pattern is so easy in Robotlegs

The Builder Pattern is a breeze in Robotlegs

public class ConcreteWidgetBuilder implements IWidgetBuilder {

  [Inject]
  public var injector:IInjector;

  public function buildPart(parameterised:IThing):IWidget {
    var widget:IWidget = injector.getInstance(IWidget);
    widget.param = parameterised;

    return widget;
  }

}

Parameterized builder

If you want to control what gets instanced based on a parameter:

public class ConcreteWidgetBuilder implements IWidgetBuilder {

  [Inject]
  public var injector:IInjector;

  public function buildPart(parameterised:IThing):IWidget {
    var interface:Class;

    switch(parameterised.style) {
      case ThingConst.COOL:
        interface = ICoolWidget;
        break;
      case ThingConst.HOT:
        interface = IHotWidget;
        break;
      default:
        interface = IDefaultWidget;
    }

    var widget:IWidget = injector.getInstance(interface);
    widget.param = parameterised;

    return widget;
  }

}

Bit freakin’ sexy if you ask me.