designPattern/DesignPattern/FSM/Machines/EquipmentStateMachine.cs

using FSM.States;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace FSM.Machines
{
    public class EquipmentEventHandler
    {
        public IEquipmentState CurrentState { get; private set; }
        public EquipmentEvent EquipmentEvent { get; private set; }
        public string Message { get; private set; }

        public EquipmentEventHandler(IEquipmentState currentState, EquipmentEvent equipmentEvent, string message)
	    {
            CurrentState = currentState;
            EquipmentEvent = equipmentEvent;
            Message = message;
	    }
    }

    public class EquipmentStateMachine
    {
        private IEquipmentState _currentState;

        public event EventHandler<EquipmentEventHandler> OnHandleEvent;

        public EquipmentStateMachine(IEquipmentState initialState)
        {
            _currentState = initialState;
            _currentState.Enter();
        }

        public void SetState(IEquipmentState newState)
        {
            _currentState.Exit();
            _currentState = newState;
            _currentState.Enter();
        }

        public void HandleEvent(EquipmentEvent equipmentEvent)
        {
            if (OnHandleEvent != null)
                OnHandleEvent(this, new EquipmentEventHandler(_currentState, equipmentEvent, "HandleEvent called"));

            bool handleResult = _currentState.HandleEvent(equipmentEvent, this);
            if (OnHandleEvent != null)
            {
                string message;

                if (handleResult)
                    message = "Success to handle the event";
                else
                    message = "Fail to handle the event";

                OnHandleEvent(this, new EquipmentEventHandler(_currentState, equipmentEvent, message));
            }
        }
    }
}