c18-原型例.txt

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//原型方法

//可利用抽象工厂方法
class MazeFactory
{
public:
	MazeFactory();

	//工厂方法集合
	virtual Maze * MakeMaze() const	{return new Maze;} 
	virtual Room * MakeRoom(int n) const    {return new Room(1);}
	virtual Wall * MakeWall() const 	{return new Wall;}
	virtual Door * MakeDoor(Room * r1,Room * r2) const
			{return new Door(r1,r2);} 	
};

Maze * Game::CreateMaze(MazeFactory & factory)
{
	Maze * aMaze=factory.MakeMaze();
	Room * r1=factory.MakeRoom(1);
	Room * r2=factory.MakeRoom(2);
	Door * theDoor=factory.MakeDoor(r1,r2);

	aMaze->AddRoom(r1);
	aMaze->AddRoom(r2);
	
	
	return aMaze;
}

//-------------------------------------------------------------------------------------------

//具体的原型工厂

class MazePrototypeFactory:public MazeFactory
{
public:
	MazePrototypeFactory(Maze * m, Wall * w,Room * r,Door * d)
		{prototypeMaze=m; prototypeRoom=r; prototypeWall=w;prototypeDoor=d;}

	//工厂方法集合
	Maze * MakeMaze() const;		 
	Room * MakeRoom(int n) const;    
	Wall * MakeWall() const ;	
	Door * MakeDoor(Room * r1,Room * r2) const;
private:
	Maze * prototypeMaze;
	Room * prototypeRoom;
	Wall * prototypeWall;
	Door * prototypeDoor;
};

Wall * MakeWall() const 	
{
	return prototypeWall->Clone();
}

Door * MakeDoor(Room * r1,Room * r2) const
{	Door * door=prototypeDoor->Clone();
	door->Initialize(r1,r2);
	return door;
} 



// 实际使用
Game mygame;
MazePrototypeFactory factory(new Maze,new Wall,new Room,new Door);
Maze * aMaze=mygame.CreateMaze(factory);