OFSMBase.c

Go to the documentation of this file.

 
class OFSMBase<Class FSMStateBase, Class FSMEventBase, Class FSMActionBase, Class FSMGuardBase>
{
  protected ref array<ref FSMStateBase> m_States; 
  protected ref array<ref FSMStateBase> m_InitialStates; 
  protected ref array<ref FSMTransition<FSMStateBase, FSMEventBase, FSMActionBase, FSMGuardBase>> m_Transitions; 
 
  void OFSMBase()
  {
    m_States = new array<ref FSMStateBase>;
    m_InitialStates = new array<ref FSMStateBase>;
    m_Transitions = new array<ref FSMTransition<FSMStateBase, FSMEventBase, FSMActionBase, FSMGuardBase>>;
  }
 
  array<ref FSMStateBase> GetCurrentState()
  {
    return m_States;
  }
 
  void SetInitialStates(array<ref FSMStateBase> initial_states)
  {
    m_InitialStates = initial_states;
 
    for (int s = 0; s < initial_states.Count(); ++s)
      m_States.Insert(initial_states[s]);
  }
 
  void Start(array<ref FSMEventBase> initial_events = null)
  {
    if (LogManager.IsInventoryHFSMLogEnable()) fsmbDebugPrint("[ofsm] " + this.ToString() + "::Start(" + initial_events.ToString() + "), init_state=" + m_InitialStates.ToString());
 
    for (int s = 0; s < m_States.Count(); ++s)
    {
      m_States[s] = m_InitialStates[s];
 
      if (initial_events)
        m_States[s].OnEntry(initial_events[s]);
      else
        m_States[s].OnEntry(null);
    }
  }
 
  bool IsRunning()
  {
    int sc = m_States.Count();
    if (sc)
    {
      for (int s = 0; s < sc; ++s)
        if (m_States[s] != null)
          return true;
    }
    return false;
  }
 
  void Terminate(array<ref FSMEventBase> terminal_events = null)
  {
    if (IsRunning())
    {
      for (int s = 0; s < m_States.Count(); ++s)
      {
        if (terminal_events)
          m_States[s].OnExit(terminal_events[s]);
        else
          m_States[s].OnExit(null);
 
        m_States[s] = null;
      }
    }
  }
 
  void Update(float dt)
  {
    if (IsRunning())
    {
      for (int s = 0; s < m_States.Count(); ++s)
        m_States[s].OnUpdate(dt);
    }
  }
 
  void AddTransition(FSMTransition<FSMStateBase, FSMEventBase, FSMActionBase, FSMGuardBase> t)
  {
    m_Transitions.Insert(t);
  }
 
  ProcessEventResult ProcessEvent(FSMEventBase e)
  {
    int count = m_Transitions.Count();
    for (int i = 0; i < count; ++i)
    {
      FSMTransition<FSMStateBase, FSMEventBase, FSMActionBase, FSMGuardBase> row = m_Transitions.Get(i);
      if (row.m_event.Type() == e.Type())
      {
        for (int s = 0; s < m_States.Count(); ++s)
        {
          if (row.m_srcState.Type() == m_States[s].Type() && row.m_event.Type() == e.Type())
          {
            FSMTransition<FSMStateBase, FSMEventBase, FSMActionBase, FSMGuardBase> t = m_Transitions.Get(i);
            bool hasGuard = t.m_guard != NULL;
            if (!hasGuard || (hasGuard && t.m_guard.GuardCondition(e))) // 1) exec guard (if any)
            {
              ProcessLocalTransition(s, t, e); // 2) process transition allowed by guard
            }
          }
        }
      }
    }
    return ProcessEventResult.FSM_NO_TRANSITION;
  }
 
  protected ProcessEventResult ProcessLocalTransition(int s, FSMTransition<FSMStateBase, FSMEventBase, FSMActionBase, FSMGuardBase> t, FSMEventBase e)
  {
    if (LogManager.IsInventoryHFSMLogEnable()) fsmbDebugPrint("[ofsm] (local) state=" + t.m_srcState.ToString() + "-------- event=" + e.ToString() + "[G=" + t.m_guard.ToString() + "]/A=" + t.m_action.ToString() + " --------|> dst=" + t.m_dstState.ToString());
 
    m_States[s].OnExit(e); // 1) call onExit on old state
 
    if (t.m_action)
      t.m_action.Action(e); // 2) execute transition action (if any)
 
    m_States[s] = t.m_dstState; // 3) change state to new
 
    if (t.m_dstState != NULL)
    {
      m_States[s].OnEntry(e); // 4a) call onEntry on new state
      return ProcessEventResult.FSM_OK;
    }
    else
    {
      if (LogManager.IsInventoryHFSMLogEnable()) fsmbDebugPrint("[ofsm] terminating fsm: state=" + t.m_srcState.ToString() + " event=" + e.ToString());
      return ProcessEventResult.FSM_TERMINATED; // 4b) or terminate
    }
  }
};