FSMState.AddTransition C# (CSharp) Method

    public void AddTransition(Transition trans, StateID id)
    {
        if (trans == Transition.NullTransition)
        {
            Debug.LogError("FSMState ERROR: NullTransition is not allowed for a real transition");
            return;
        }

        if (id == StateID.STS_NONE)
        {
            Debug.LogError("FSMState ERROR: NullStateID is not allowed for a real ID");
            return;
        }

        if (map.ContainsKey(trans))
        {
            Debug.LogError("FSMState ERROR: State " + stateID.ToString() + " already has transition " + trans.ToString() + "Impossible to assign to another state");
            return;
        }

        map.Add(trans, id);
    }

    public GameStateController()
    {
        gameFsm       = new FSM("GameFSM");
        preStartState = gameFsm.AddState((byte)GameState.PreStart);
        idleState     = gameFsm.AddState((byte)GameState.Idle);
        playState     = gameFsm.AddState((byte)GameState.Play);
        pauseState    = gameFsm.AddState((byte)GameState.Pause);
        gameOverState = gameFsm.AddState((byte)GameState.GameOver);

        preStartAction = new PreStartAction(preStartState);
        playingAction  = new PlayAction(playState);
        pauseAction    = new PauseAction(pauseState);
        gameOverAction = new GameOverAction(gameOverState);
        idleAction     = new IdleAction(idleState);

        preStartState.AddTransition((byte)FSMTransition.ToIdle, idleState);
        idleState.AddTransition((byte)FSMTransition.ToPlay, playState);
        playState.AddTransition((byte)FSMTransition.ToPause, pauseState);
        playState.AddTransition((byte)FSMTransition.ToGameOver, gameOverState);
        gameOverState.AddTransition((byte)FSMTransition.ToIdle, idleState);

        preStartAction.Init();
        idleAction.Init();
        playingAction.Init();
        pauseAction.Init();
        gameOverAction.Init();
    }