[设计模式as3版]四.简单工厂

抽象产品类

package {
	
	//cake是抽象类
	public class Cake {
		
		protected var _name:String;
		
		public function Cake() {
			
		}
		
		internal function prepare():void {
			trace("Preparing " + name);
		}
		
		internal function bake():void {
			trace("Baking " + name);	
		}
		
		internal function box():void {
			trace("Boxing " + name);	
		}

		public function get name():String {
			return _name;
		}
	}
}

package {
	
	public class StrawberryCake  extends Cake {
		
		public function StrawberryCake() {
			_name = "strawberry cake";		
		}
		
	}
}

package {
	
	public class ChocolateCake extends Cake {
		
		public function ChocolateCake() {
			_name = "chocolate cake";	
		}
	}
}

package {
	
	public class CreamCake  extends Cake {
		
		public function CreamCake() {
			_name = "cream cake";	
		}

	}
}

package {
	
	public class SimpleCakeFactory {
		
		public function SimpleCakeFactory() {
			
		}
		
		public function createCake(type:String):Cake {
			var cake:Cake;
			if(type == "chocolateCake") {
				cake = new ChocolateCake();	
			}else if(type == "creamCake") {
				cake = new CreamCake();
			}else if(type == "strawberryCake") {
				cake = new StrawberryCake();
			}
			return cake;
		}
		
	}
}

package {
	
	public class CakeShop {
		
		private var factory:SimpleCakeFactory;
		
		public function CakeShop(factory:SimpleCakeFactory) {
			this.factory = factory;	
		}
		
		public function orderCake(type:String):Cake {
			var cake:Cake = factory.createCake(type);
			cake.prepare();
			cake.bake();
			cake.box();
			return cake;
		}
	}
}

package {
	
	import flash.display.Sprite;
	
	public class SimpleFactoryTest extends Sprite {
		
		public function SimpleFactoryTest() {
			var factory:SimpleCakeFactory = new SimpleCakeFactory();
			var cakeShop:CakeShop = new CakeShop(factory);	
			var cake:Cake = cakeShop.orderCake("chocolateCake");
			trace("We ordered a " + cake.name);
			cake = cakeShop.orderCake("creamCake");
			trace("We ordered a " + cake.name);
		}
		
	}
}