public void SetState(State state)
{
StateChangeEventArgs e =
new StateChangeEventArgs(
name_, "SET", state_, state);
#if TRACE
Trace.WriteLine("ENTER STATE : " + state.Name);
#endif
state_ = state;
OnStateChange(e);
return;
}
//-----------------------------------------------------------
// Member functions.
//
// Constructor.
public StateChangeEventArgs(string fsmName,
string transitionType,
State previousState,
State newState)
{
_fsmName = fsmName;
_transitionType = transitionType;
_previousState = previousState;
_newState = newState;
}
public void PushState(State state)
{
StateChangeEventArgs e =
new StateChangeEventArgs(
name_, "PUSH", state_, state);
#if TRACE
Trace.WriteLine("PUSH TO STATE : " + state.Name);
#endif
if (state_ != null)
{
stateStack_.Push(state_);
}
state_ = state;
OnStateChange(e);
return;
}
public void PopState()
{
if (stateStack_.Count == 0)
{
#if TRACE
Trace.WriteLine("POPPING ON EMPTY STATE STACK.");
#endif
throw new
System.InvalidOperationException(
"popping an empty state stack");
}
else
{
State nextState = (State) stateStack_.Pop();
StateChangeEventArgs e =
new StateChangeEventArgs(
name_, "POP", state_, nextState);
// The pop method removes the top element
// from the stack and returns it.
state_ = nextState;
#if TRACE
Trace.WriteLine("POP TO STATE : " + state_.Name);
#endif
OnStateChange(e);
}
return;
}
public void ClearState()
{
previousState_ = state_;
state_ = null;
return;
}
//-----------------------------------------------------------
// Member functions.
//
public FSMContext(State state)
{
// There is no state until the application explicitly
// sets the initial state.
name_ = "FSMContext";
state_ = state;
transition_ = "";
previousState_ = null;
stateStack_ = new System.Collections.Stack();
debugFlag_ = false;
debugStream_ = null;
}
public void SetState(State state)
{
StateChangeEventArgs e =
new StateChangeEventArgs(
name_, "SET", state_, state);
#if TRACE
Trace.WriteLine("ENTER STATE : " + state.Name);
#endif
// clearState() is not called when a transition has
// no actions, so set _previousState to _state in
// that situation. We know clearState() was not
// called when _state is not null.
if (state_ != null)
{
previousState_ = state_;
}
state_ = state;
OnStateChange(e);
return;
}