Design Pattern 第三章类MazeGame的代码

// file MazeGame.h

#ifndef _MAZEGAME_H
#define _MAZEGAME_H

#include "Maze.h"
#include "Room.h"
#include "Wall.h"
#include "Door.h"

#include "MazeFactory.h"

class MazeGame_Normal {
public:
  Maze* CreateMaze() {
    Maze* aMaze = new Maze;
    Room* r1 = new Room(1);
    Room* r2 = new Room(2);
    Door* theDoor = new Door(r1, r2);

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

    r1->SetSide(North, new Wall);
    r1->SetSide(East, theDoor);
    r1->SetSide(South, new Wall);
    r1->SetSide(West, new Wall);

    r2->SetSide(North, new Wall);
    r2->SetSide(East, new Wall);
    r2->SetSide(South, new Wall);
    r2->SetSide(West, theDoor);

    return aMaze;  
  }
};

class MazeGame_Abstract_Factory {
public:
  MazeGame_Abstract_Factory() {}
 
  Maze* 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);

    r1->SetSide(North, factory.MakeWall());
    r1->SetSide(East, theDoor);
    r1->SetSide(South, factory.MakeWall());
    r1->SetSide(West, factory.MakeWall());

    r2->SetSide(North, factory.MakeWall());
    r2->SetSide(East, factory.MakeWall());
    r2->SetSide(South, factory.MakeWall());
    r2->SetSide(West, theDoor);

    return aMaze;
  }
};

class MazeGame_FactoryMethod {
 public:
  Maze* CreateMaze(){
    Maze* aMaze = MakeMaze();

    Room* r1 = MakeRoom(1);
    Room* r2 = MakeRoom(2);

    Door* theDoor = MakeDoor(r1, r2);

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

    r1->SetSide(North, MakeWall());
    r1->SetSide(East, theDoor);
    r1->SetSide(South, MakeWall());
    r1->SetSide(West, MakeWall());


    r2->SetSide(North, MakeWall());
    r2->SetSide(East, MakeWall());
    r2->SetSide(South, MakeWall());
    r2->SetSide(West,theDoor);
    return aMaze;
  }

  // factory methods:
  virtual Maze* MakeMaze() const                   { return new Maze; }
  virtual Room* MakeRoom(int n) const              { return new Room(n); }
  virtual Wall* MakeWall() const                   { return new Wall; }
  virtual Door* MakeDoor(Room* r1, Room* r2) const { return new Door(r1, r2); }
 
};
#endif 

//file MazeGame.cpp

#include "MazeGame.h"