@Override
  public boolean canAccept(Object event) {
    ImmutableState<?, ?, ?, ?> testRawState = getCurrentRawState();
    if (testRawState == null) { // assuming auto_start enabled
      testRawState = getInitialRawState();
    }
    return canAccept(testRawState, event);
  }

  private boolean canAccept(ImmutableState<?, ?, ?, ?> state, Object event) {
    final ImmutableState<?, ?, ?, ?> parentState = state.getParentState();

    return state.getAcceptableEvents().contains(event) ||
           (parentState != null && canAccept(parentState, event));
  }