class StopPumping extends DriverEvent {
    public StopPumping(long eventTime,Driver d){
        super(eventTime,d);
    }

    public void perform(Scheduler scheduler){
        Driver d = getDriver();

        // Now pass the driver to the gas station for payment.
        GasStation station = d.getStation();
        station.stopPumping(d);
    }

    public String toString(){
        return getWhen()+" StopPumping";
    }
}