public void setDriver(Driver driver) { this.driver = (driver == null) ? AppConfig.getNullDriver() : driver;
public void setDriver(IPatchDriver driver) { this.driver = (driver == null) ? AppConfig.getNullDriver() : (Driver)driver;
    public void setDriver(Driver driver) {  	this.driver = (driver == null) ? AppConfig.getNullDriver() : driver;    }