finite_state_machine_machine.go

type IFiniteStateMachine interface {
  Current() State
  Transition(event Event) error
}

func (fsm *FiniteStateMachine) Current() State {
  if fsm.current == "" {
    return fsm.Initial
  }
  return fsm.current
}

func (fsm *FiniteStateMachine) Transition(event Event) error {
  action := fsm.StateMap[fsm.Current()][event]
  if fmt.Sprint(action) != fmt.Sprint(Action{}) {
    fsm.current = action.Destination
    return nil
  }
  return fmt.Errorf("transition invalid")
}