public void GuestArrives(string guest)
{
// Now that we have a guest, someone can create a Butler.
// It shouldn't be Party that does this. Party shouldn't be responsible for knowing Butler's
// friends and family in the first place. But party has the information
// and needs a Butler now and there is nobody else around to do it.
// Not only that, but we have to construct a whole new butler for each guest that arrives!
// We could instead create one of each type and than add an IF THEN IF THEN IF THEN ELSE THEN IF SOMETHING ELSE,
// But then why even bother with a creational pattern in the first place?
// Here we go.
if (new [] { "Billy", "Bobby" }.Contains(guest))
{
MyButler = new FriendButler();
}
else if (new [] { "Willy", "Wally" }.Contains(guest))
{
MyButler = new FamilyButler();
}
else
{
MyButler = new PoliteButler();
}
Console.WriteLine("Knock knock!");
MyButler.AnswerDoor(guest);
}
static void Main(string[] args)
{
GreetingsFactory gf = new GreetingsFactory();
Butler b = new Butler(gf);
Party p = new Party(b);
Console.WriteLine("Who has arrived?");
var guest = Console.ReadLine();
p.GuestArrives(guest);
}
public Party(Butler butler)
{
this.MyButler = butler;
}