/// <summary>
/// Peeks a state from the stack. A peek returns null if the stack is empty. It doesn't trigger any call.
/// </summary>
/// <returns></returns>
public StateMB <T> PeekState()
{
StateMB <T> state = null;
if (stack.Count > 0)
{
state = stack.Peek();
}
return(state);
}
/// <summary>
/// Checks if a an StateType is the current state.
/// </summary>
/// <param name="state"></param>
/// <returns></returns>
/// <exception cref="ArgumentNullException"></exception>
public bool IsCurrent(StateMB <T> state)
{
if (state == null)
{
throw new ArgumentNullException();
}
var current = PeekState();
if (current == null)
{
return(false);
}
return(current.GetType() == state.GetType());
}
/// <summary>
/// Pushes state by instance of the class triggering OnEnterState for the
/// pushed state and if not silent OnExitState for the previous state in the stack
/// </summary>
/// <param name="state"></param>
/// <param name="isSilent"></param>
/// <exception cref="EvaluateException"></exception>
public void PushState(StateMB <T> state, bool isSilent = false)
{
if (!statesRegister.ContainsKey(state.GetType()))
{
throw new EvaluateException(
"State " + state + " not registered yet!");
}
Log("Operation: Push, state: " + state.GetType(), "purple");
if (stack.Count > 0 && !isSilent)
{
var previous = stack.Peek();
previous.OnExitState();
}
stack.Push(state);
state.OnEnterState();
}