/// <summary>
/// This method tries to change the state the FSM is in based on
/// the current state and the transition passed. If current state
/// doesn't have a target state for the transition passed,
/// an ERROR message is printed.
/// </summary>
public void PerformTransition(WolfAITransition trans)
{
// Check for NullTransition before changing the current state
if (trans == WolfAITransition.NullTransition)
{
Debug.LogError("FSM ERROR: NullTransition is not allowed for a real transition");
return;
}
// Check if the currentState has the transition passed as argument
WolfAIStateID id = currentState.GetOutputState(trans);
if (id == WolfAIStateID.NullStateID)
{
Debug.LogError("FSM ERROR: State " + currentStateID.ToString() + " does not have a target state " +
" for transition " + trans.ToString());
return;
}
// Update the currentStateID and currentState
currentStateID = id;
foreach (WolfAIFSMState state in states)
{
if (state.ID == currentStateID)
{
// Do the post processing of the state before setting the new one
currentState.DoBeforeLeaving();
currentState = state;
// Reset the state to its desired condition before it can reason or act
currentState.DoBeforeEntering();
break;
}
}
}
/// <summary>
/// This method deletes a pair transition-state from this state's map.
/// If the transition was not inside the state's map, an ERROR message is printed.
/// </summary>
public void DeleteTransition(WolfAITransition trans)
{
// Check for NullTransition
if (trans == WolfAITransition.NullTransition)
{
Debug.LogError("FSMState ERROR: NullTransition is not allowed");
return;
}
// Check if the pair is inside the map before deleting
if (map.ContainsKey(trans))
{
map.Remove(trans);
return;
}
Debug.LogError("FSMState ERROR: Transition " + trans.ToString() + " passed to " + stateID.ToString() +
" was not on the state's transition list");
}
/// <summary>
/// This method returns the new state the FSM should be if
/// this state receives a transition and
/// </summary>
public WolfAIStateID GetOutputState(WolfAITransition trans)
{
// Check if the map has this transition
if (map.ContainsKey(trans))
{
return map[trans];
}
return WolfAIStateID.NullStateID;
}
public void AddTransition(WolfAITransition trans, WolfAIStateID id)
{
// Check if anyone of the args is invalid
if (trans == WolfAITransition.NullTransition)
{
Debug.LogError("FSMState ERROR: NullTransition is not allowed for a real transition");
return;
}
if (id == WolfAIStateID.NullStateID)
{
Debug.LogError("FSMState ERROR: NullStateID is not allowed for a real ID");
return;
}
// Since this is a Deterministic FSM,
// check if the current transition was already inside the map
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);
}