OOP2

import java.util.Observable;

import java.util.Observer;

/**

 *

 * @author jvermeulen

 */

public abstract class AbstractView implements View, Observer {

    private Observable mModel;

    private Controller mController;

    /**

     * Empty constructor so that the model and controller can be set later.

     */

    public AbstractView() {        

    }

    public AbstractView(Observable model, Controller controller) {

        // Set the model.

        setModel(model);

        // If a controller was supplied, use it. Otherwise let the first call to 

        // getController() create the default controller.

        if (controller != null) {

            setController(controller);

        }

    }

    @Override

    public void setController(Controller controller) {

        mController = controller;

        // Tell the controller this object is its view.

        getController().setView(this);

    }

    @Override

    public Controller getController() {

        // If a controller hasn't been defined yet...

        if (mController == null) {

            // ...make one. Note that defaultController is normally overriden by 

            // the AbstractView subclass so that it returns the appropriate 

            // controller for the view.

            setController(defaultController(getModel()));

        }

        return mController;

    }

    @Override

    public void setModel(Observable model) {

        mModel = model;

    }

    @Override

    public Observable getModel() {

        return mModel;

    }

    @Override

    public Controller defaultController(Observable model) {

        return null;

    }

    /**

     * A do-nothing implementation of the Observer interface's update method.

     * Subclasses of AbstractView will provide a concrete implementation for 

     * this method.

     */

    @Override

    public void update(Observable o, Object arg) {    

    }

}