class VelocityController {

  public void addVelocityListener(VelocityListener listener) {
    if (listener == null) {
      throw new NullPointerException("listener is null");
    }
    velocityListeners.add(listener);
  }

  public  VelocityController(int maxDecel,
                            int maxAccel,
                            int maxRevVelo,
                            int maxFwdVelo);

}