1
2{《HeadFirst设计模式》之组合模式 }
3{ 组合与单项的抽象父类 }
4{ 编译工具：Delphi2007 for win32}
5{ E-Mail ：[email protected] }
6
7unit uMenuComponent;
8
9interface
10
11uses
12 SysUtils;
13
14type
15 TMenuComponent = class abstract(TObject)
16 public
17 procedure Add(aMenuComponent: TMenuComponent); virtual;
18 procedure Remove(aMenuComponent: TMenuComponent); virtual;
19 function GetChild(i: Integer): TMenuComponent; virtual;
20 function GetName: string; virtual;
21 function GetDescription: string; virtual;
22 function GetPrice: Integer; virtual;
23 function IsVegetarian: Boolean; virtual;
24 procedure Print; virtual;
25 end;
26
27implementation
28
29{ TMenuComponent }
30
31procedure TMenuComponent.Add(aMenuComponent: TMenuComponent);
32begin
33 raise Exception.Create(‘UnSupported Operation Exception!‘);
34end;
35
36function TMenuComponent.GetChild(i: Integer): TMenuComponent;
37begin
38 raise Exception.Create(‘UnSupported Operation Exception!‘);
39end;
40
41function TMenuComponent.GetDescription: string;
42begin
43 raise Exception.Create(‘UnSupported Operation Exception!‘);
44end;
45
46function TMenuComponent.GetName: string;
47begin
48 raise Exception.Create(‘UnSupported Operation Exception!‘);
49end;
50
51function TMenuComponent.GetPrice: Integer;
52begin
53 raise Exception.Create(‘UnSupported Operation Exception!‘);
54end;
55
56function TMenuComponent.IsVegetarian: Boolean;
57begin
58 raise Exception.Create(‘UnSupported Operation Exception!‘);
59end;
60
61procedure TMenuComponent.Print;
62begin
63 raise Exception.Create(‘UnSupported Operation Exception!‘);
64end;
65
66procedure TMenuComponent.Remove(aMenuComponent: TMenuComponent);
67begin
68 raise Exception.Create(‘UnSupported Operation Exception!‘);
69end;
70
71end.
1
2{《HeadFirst设计模式》之组合模式 }
3{ 单项类 }
4{ 编译工具：Delphi2007 for win32 }
5{ E-Mail ：[email protected] }
6
7unit uMenuItem;
8
9interface
10
11uses
12 uMenuComponent;
13
14type
15 TMenuItem = class(TMenuComponent)
16 private
17 FName : string;
18 FDescription: string;
19 FVegetarian : Boolean;
20 FPrice: Integer;
21 public
22 constructor Create(aName, aDescription: string;
23 aVegetarian : Boolean;
24 aPrice: Integer);
25 function GetName: string; override;
26 function GetDescription: string; override;
27 function GetPrice: Integer; override;
28 function IsVegetarian: Boolean; override;
29 procedure Print; override;
30 end;
31
32implementation
33
34{ TMenuItem }
35
36constructor TMenuItem.Create(aName, aDescription: string;
37 aVegetarian: Boolean;
38 aPrice: Integer);
39begin
40 FName := aName;
41 FDescription := aDescription;
42 FVegetarian := aVegetarian;
43 FPrice := aPrice;
44end;
45
46function TMenuItem.GetDescription: string;
47begin
48 Result := FDescription
49end;
50
51function TMenuItem.GetName: string;
52begin
53 Result := FName;
54end;
55
56function TMenuItem.GetPrice: Integer;
57begin
58 Result := FPrice;
59end;
60
61function TMenuItem.IsVegetarian: Boolean;
62begin
63 Result := FVegetarian
64end;
65
66procedure TMenuItem.Print;
67begin
68 Write(‘ ‘ + GetName);
69 if IsVegetarian then
70 begin
71 Write(‘(V)‘);
72 end;
73 Writeln(‘, ‘, GetPrice);
74 Writeln(‘ --‘ + GetDescription);
75end;
76
77end.
1
2{《HeadFirst设计模式》之组合模式 }
3{ 组合类 }
4{ 编译工具：Delphi2007 for win32 }
5{ E-Mail ：[email protected] }
6
7unit uMenu;
8
9interface
10
11uses
12 uMenuComponent, Classes;
13
14type
15 TMenu = class(TMenuComponent)
16 private
17 FMenuComponents: TList;
18 FName: string;
19 FDescription: string;
20 public
21 constructor Create(aName, aDescription: string);
22 destructor Destroy; override;
23 procedure Add(aMenuComponent: TMenuComponent); override;
24 procedure Remove(aMenuComponent: TMenuComponent); override;
25 function GetChild(i: Integer): TMenuComponent; override;
26 function GetName: string; override;
27 function GetDescription: string; override;
28 procedure Print; override;
29 end;
30
31implementation
32
33{ TMenu }
34
35constructor TMenu.Create(aName, aDescription: string);
36begin
37 FMenuComponents := TList.Create;
38 FName := aName;
39 FDescription := aDescription;
40end;
41
42destructor TMenu.Destroy;
43begin
44 FMenuComponents.Clear;
45end;
46
47procedure TMenu.Add(aMenuComponent: TMenuComponent);
48begin
49 FMenuComponents.Add(aMenuComponent);
50end;
51
52procedure TMenu.Remove(aMenuComponent: TMenuComponent);
53begin
54 FMenuComponents.Remove(aMenuComponent);
55end;
56
57function TMenu.GetChild(i: Integer): TMenuComponent;
58begin
59 Result := TMenuComponent(FMenuComponents.Items[i]);
60end;
61
62function TMenu.GetDescription: string;
63begin
64 Result := FDescription;
65end;
66
67function TMenu.GetName: string;
68begin
69 Result := FName;
70end;
71
72procedure TMenu.Print;
73var
74 MenuComponent: Pointer;
75begin
76 Write(GetName);
77 Writeln(‘, ‘ + GetDescription);
78 Writeln(‘-------------------‘);
79
80 for MenuComponent in FMenuComponents do
81 TMenuComponent(MenuComponent).Print;
82end;
83
84end.
1
2{《HeadFirst设计模式》之组合模式 }
3{ 组合的用户，女招待只需认识 TMenuComponent 即可。}
4{ 编译工具：Delphi2007 for win32 }
5{ E-Mail ：[email protected] }
6
7unit uWaitress;
8
9interface
10
11uses
12 uMenuComponent;
13
14type
15 TWaitress = class(TObject)
16 private
17 FAllMenus: TMenuComponent;
18 public
19 constructor Create(aAllMenus: TMenuComponent);
20 procedure PrintMenu;
21 end;
22
23implementation
24
25{ TWaitress }
26
27constructor TWaitress.Create(aAllMenus: TMenuComponent);
28begin
29 FAllMenus := aAllMenus;
30end;
31
32procedure TWaitress.PrintMenu;
33begin
34 FAllMenus.Print;
35end;
36
37end.
1
2{《HeadFirst设计模式》之组合模式 }
3{ 客户端 }
4{ 编译工具：Delphi2007 for win32 }
5{ E-Mail ：[email protected] }
6
7program pMenuTestDrive;
8
9{$APPTYPE CONSOLE}
10
11uses
12 SysUtils,
13 uMenuComponent in ‘uMenuComponent.pas‘,
14 uMenuItem in ‘uMenuItem.pas‘,
15 uMenu in ‘uMenu.pas‘,
16 uWaitress in ‘uWaitress.pas‘;
17
18var
19 PancakeHouseMenu: TMenuComponent;
20 DinerMenu: TMenuComponent;
21 CafeMenu: TMenuComponent;
22 CoffeeMenu: TMenuComponent;
23 DessertMenu: TMenuComponent;
24
25 AllMenus: TMenuComponent;
26
27 Waitress: TWaitress;
28
29begin
30 PancakeHouseMenu := TMenu.Create(‘PANCAKE HOUSE MENU‘, ‘Breakfast‘);
31 DinerMenu := TMenu.Create(‘DINER MENU‘, ‘Lunch‘);
32 CafeMenu := TMenu.Create(‘CAFE MENU‘, ‘Dinner‘);
33 CoffeeMenu := TMenu.Create(‘COFFEE MENU‘, ‘Stuff to go with your afternoon coffee‘);
34 DessertMenu := TMenu.Create(‘DESSERT MENU‘, ‘Dessert of course!‘);
35
36 AllMenus := TMenu.Create(‘ALL MENUS‘, ‘All menus combined‘);
37
38
39 AllMenus.Add(PancakeHouseMenu);
40 AllMenus.Add(DinerMenu);
41 AllMenus.Add(CafeMenu);
42
43 PancakeHouseMenu.add(TMenuItem.Create(
44 ‘K&B‘‘s Pancake Breakfast‘,
45 ‘Pancakes with scrambled eggs, and toast‘,
46 True,
47 299));
48
49 PancakeHouseMenu.add(TMenuItem.Create(
50 ‘Regular Pancake Breakfast‘,
51 ‘Pancakes with fried eggs, sausage‘,
52 False,
53 299));
54
55 PancakeHouseMenu.add(TMenuItem.Create(
56 ‘Blueberry Pancakes‘,
57 ‘Pancakes made with fresh blueberries, and blueberry syrup‘,
58 True,
59 349));
60
61 PancakeHouseMenu.add(TMenuItem.Create(
62 ‘Waffles‘,
63 ‘Waffles, with your choice of blueberries or strawberries‘,
64 True,
65 359));
66
67
68 DinerMenu.add(TMenuItem.Create(
69 ‘Vegetarian BLT‘,
70 ‘(Fakin‘‘) Bacon with lettuce & tomato on whole wheat‘,
71 True,
72 299));
73
74 DinerMenu.add(TMenuItem.Create(
75 ‘BLT‘,
76 ‘Bacon with lettuce & tomato on whole wheat‘,
77 False,
78 299));
79
80 DinerMenu.add(TMenuItem.Create(
81 ‘Soup of the day‘,
82 ‘A bowl of the soup of the day, with a side of potato salad‘,
83 False,
84 329));
85
86 DinerMenu.add(TMenuItem.Create(
87 ‘Hotdog‘,
88 ‘A hot dog, with saurkraut, relish, onions, topped with cheese‘,
89 False,
90 305));
91
92 DinerMenu.add(TMenuItem.Create(
93 ‘Steamed Veggies and Brown Rice‘,
94 ‘Steamed vegetables over brown rice‘,
95 True,
96 399));
97
98 DinerMenu.Add(TMenuItem.Create(
99 ‘Pasta‘,
100 ‘Spaghetti with Marinara Sauce, and a slice of sourdough bread‘,
101 True,
102 389));
103
104 DinerMenu.add(dessertMenu);
105
106
107 DessertMenu.add(TMenuItem.Create(
108 ‘Apple Pie‘,
109 ‘Apple pie with a flakey crust, topped with vanilla icecream‘,
110 True,
111 159));
112
113 DessertMenu.add(TMenuItem.Create(
114 ‘Cheesecake‘,
115 ‘Creamy New York cheesecake, with a chocolate graham crust‘,
116 True,
117 199));
118
119 DessertMenu.add(TMenuItem.Create(
120 ‘Sorbet‘,
121 ‘A scoop of raspberry and a scoop of lime‘,
122 True,
123 189));
124
125
126 CafeMenu.add(TMenuItem.Create(
127 ‘Veggie Burger and Air Fries‘,
128 ‘Veggie burger on a whole wheat bun, lettuce, tomato, and fries‘,
129 True,
130 399));
131
132 CafeMenu.add(TMenuItem.Create(
133 ‘Soup of the day‘,
134 ‘A cup of the soup of the day, with a side salad‘,
135 False,
136 369));
137
138 CafeMenu.add(TMenuItem.Create(
139 ‘Burrito‘,
140 ‘A large burrito, with whole pinto beans, salsa, guacamole‘,
141 True,
142 429));
143
144 CafeMenu.add(CoffeeMenu);
145
146
147 CoffeeMenu.add(TMenuItem.Create(
148 ‘Coffee Cake‘,
149 ‘Crumbly cake topped with cinnamon and walnuts‘,
150 True,
151 159));
152
153 CoffeeMenu.add(TMenuItem.Create(
154 ‘Bagel‘,
155 ‘Flavors include sesame, poppyseed, cinnamon raisin, pumpkin‘,
156 False,
157 69));
158
159 CoffeeMenu.add(TMenuItem.Create(
160 ‘Biscotti‘,
161 ‘Three almond or hazelnut biscotti cookies‘,
162 True,
163 89));
164
165 Waitress := TWaitress.Create(AllMenus);
166 Waitress.PrintMenu;
167
168 AllMenus.Free;
169 Waitress.Free;
170
171 Readln;
172end.
运行结果：
