我想创建一个表示有限状态机的基类,然后将由各种组件扩展。它应该尽可能通用,并且只允许执行专门为该机器设计的状态。这是我到目前为止得到的:
public interface IState<out T> where T : FiniteStateMachine {
void Enter( T p );
void Execute( T p );
void Exit( T p );
}
public class FiniteStateMachine {
public IState<FiniteStateMachine> CurrentState { get; private set; }
public void ChangeState( IState<FiniteStateMachine> s ) {
if ( CurrentState != null )
CurrentState.Exit( this );
CurrentState = s;
s.Enter( this );
}
}
public class Car : FiniteStateMachine { }
public class Boat : FiniteStateMachine { }
public class CarState : IState<Car> {
public void Entra( Car f ) { }
public void Esegui( Car f ) { }
public void Esci( Car f ) { }
}
public class BoatState : IState<Boat> {
public void Enter( Boat f ) { }
public void Execute( Boat f ) { }
public void Exit( Boat f ) { }
}
这里有一个小例子:
var car = new Car( );
var boat = new Boat( );
// These are fine
car.ChangeState( new CarState( ) );
boat.ChangeState( new BoatState( ) );
// These aren't
car.ChangeState( new BoatState( ) );
boat.ChangeState( new CarState( ) );
基本上,我只想Car.ChangeState
接受执行的状态,IState<Car>
只Boat.ChangeState
接受IState<Boat>
等等。
我无法实现这种行为,有人可以帮助我吗?