public int GetStateToTransit(Transition transition)
{
// Check whether given parameter is valid
if (isTransitionValid(transition)) { }
// Check whether state has transition and return state id the transition is pointing to
if (stateTransitions.ContainsKey(transition.TransitionID))
{
return stateTransitions[transition.TransitionID];
}
// if transition wasn't found, return -1, which is default id for non-existing state. In other words transition points to state itself.
return -1;
}
/// <summary>
/// Performs a transition to a new state.
/// </summary>
/// <param name="transition"></param>
public void PerformTransition(Transition transition)
{
// Check the state's transitions and get the id of the state where to transit. If state doesn't have transition, it returns -1, which means looping back to itself
int statetoTransit = _currentState.GetStateToTransit(transition);
if(statetoTransit != -1){
foreach(State newState in _states){
if (newState.StateID == statetoTransit) {
// Before transiting to new state, let the old state finish up and the new one to initialize.
_currentState.onLeavingState();
_currentState = newState;
_currentState.onEnteringState();
}//if
}//foreach
}//if
}
// Class Behaviour
public void AddTransition(Transition transition, State state)
{
// Check that the given parameters are valid.
if (transition==null || state == null)
{
Console.WriteLine("ERROR in State AddTransition: given parameters are not valid!");
return;
}//if
// Check for duplicates - a deterministic finite automata cannot have a transition with a same id multiple times.
if (stateTransitions.ContainsKey(transition.TransitionID))
{
Console.WriteLine("ERROR in State AddTransition: transition with id of " + transition.TransitionID + " is already included in state's transitions!");
return;
}
// Add transition
stateTransitions.Add(transition.TransitionID, state._stateID);
}
public void RemoveTransition(Transition transition)
{
//Check whether given parameter is valid.
if (isTransitionValid(transition)) { }
//Check whether given transitions exists and remove transition from state
if (stateTransitions.ContainsKey(transition.TransitionID))
{
stateTransitions.Remove(transition.TransitionID);
Console.WriteLine("Removed transition with the id of " + transition.TransitionID.ToString() +
" and name of " + transition.TransitionName + " from state " + _stateName + " with id " + _stateID);
return;
}//if
//If transition wasn't found, write error
Console.WriteLine("ERROR in RemoveTransition: transition was not found in state's transitions");
}
private bool isTransitionValid(Transition transition)
{
if (transition == null)
{
Console.WriteLine("ERROR: given transition parameter is null");
return false;
}//if
return true;
}
//TEST: Success
private void CreateTestTransitions()
{
_transitionA = new Transition("a", 0);
_transitionB = new Transition("b", 0);
Console.WriteLine("Transition name: " + _transitionA.TransitionName + " transition ID: " + _transitionA.TransitionID.ToString());
Console.WriteLine("Transition name: " + _transitionB.TransitionName + " transition ID: " + _transitionB.TransitionID.ToString());
}