// The Sensor interface class
public interface Sensor{
    public void draw(); // Draws the Window
    public String getDescription(); // Returns a description of the Window
}

// Extension of a simple Window without any scrollbars
class SensorPH implements Sensor {
    public void leitura() {
    }

    public String getDescription() {
        return "ph";
    }
}

// abstract decorator class - note that it implements Sensor
abstract class SensorDecorator implements Sensor{
    protected Sensor sensorToBeDecorated; // the Window being decorated

    public Sensor (Sensor sensorToBeDecorated) {
        this.sensorToBeDecorated= sensorToBeDecorated;
    }
    public void leitura() {
        windowToBeDecorated.draw(); //Delegation
    }
    public String getDescription() {
        return windowToBeDecorated.getDescription(); //Delegation
    }
}

// The first concrete decorator which adds vertical scrollbar functionality
class SensorNew1Decorator extends SensorDecorator{
    public SensorNew1Decorator (Window sensorToBeDecorated) {
        super(sensorToBeDecorated);
    }

    @Override
    public void leitura() {
        super.draw();
        newLeitura();
    }

    private void newLeitura() {
       //do
    }

    @Override
    public String getDescription() {
        return super.getDescription() + ", including new leitura";
    }
}

// The second concrete decorator which adds new sensor functionality
class SensorNew2Decorator extends SensorDecorator{
    public SensorNew2Decorator (Window sensorToBeDecorated) {
        super(sensorToBeDecorated);
    }

    @Override
    public void leitura() {
        super.draw();
        newLeitura();
    }

    private void newLeitura() {
       //do
    }

    @Override
    public String getDescription() {
        return super.getDescription() + ", including new leitura";
    }
}