PHP设计模式之装饰者模式，代码练习

aboys

1. <?php
   
2. /**
   
3. * 装饰者模式
   
4. */
   
5. 
   
6. /**
   
7.  * 冰激凌抽象类
   
8.  */
   
9. abstract class ICE
   
10. {
    
11.     public abstract function getDescription();
    
12.     public abstract function cost();
    
13. }
    
14. 
    
15. /**
    
16.  * 牛奶冰激凌，售价17RMB
    
17.  */
    
18. class MilkIce extends ICE
    
19. {
    
20.     public $description = '纯牛奶制作的冰激凌';
    
21. 
    
22.     public function getDescription()
    
23.     {
    
24.         return $this->description;
    
25.     }
    
26. 
    
27.     public function cost()
    
28.     {
    
29.         return 17;
    
30.     }
    
31. }
    
32. 
    
33. /**
    
34.  * 沙冰冰激凌，售价10RMB
    
35.  */
    
36. class SlushIce extends ICE
    
37. {
    
38.     public $description = '冰块制作的冰激凌';
    
39. 
    
40.     public function getDescription()
    
41.     {
    
42.         return $this->description;
    
43.     }
    
44. 
    
45.     public function cost()
    
46.     {
    
47.         return 10;
    
48.     }
    
49. }
    
50. 
    
51. /**
    
52.  * 冰激凌调料抽象类
    
53.  */
    
54. abstract class CondimentIce extends ICE
    
55. {
    
56.     //public abstract function getDescription();
    
57.     //public abstract function cost();
    
58. }
    
59. 
    
60. /**
    
61.  * 加香菜口味，附加5RMB
    
62.  */
    
63. class Herb extends CondimentIce
    
64. {
    
65.     public $ice;
    
66.     public $description;
    
67. 
    
68.     public function __construct($ice)
    
69.     {
    
70.         $this->ice = $ice;
    
71.         $this->description = '法国香草';
    
72.     }
    
73. 
    
74.     public function getDescription()
    
75.     {
    
76.         return $this->ice->getDescription() . ',' . $this->description;
    
77.     }
    
78. 
    
79.     public function cost()
    
80.     {
    
81.         return $this->ice->cost() + 5;
    
82.     }
    
83. }
    
84. 
    
85. /**
    
86.  * 加草莓口味，附加8RMB
    
87.  */
    
88. class Berries extends CondimentIce
    
89. {
    
90.     public $ice;
    
91.     public $description;
    
92. 
    
93.     public function __construct($ice)
    
94.     {
    
95.         $this->ice = $ice;
    
96.         $this->description = '野草莓';
    
97.     }
    
98. 
    
99.     public function getDescription()
    
100.     {
     
101.         return $this->ice->getDescription() . ',' . $this->description;
     
102.     }
     
103. 
     
104.     public function cost()
     
105.     {
     
106.         return $this->ice->cost() + 8;
     
107.     }
     
108. }
     
109. 
     
110. 
     
111. // example
     
112. // 购买一个奶油香草冰激凌
     
113. $ice_object = new MilkIce();
     
114. $ice_object = new Herb($ice_object);
     
115. echo $ice_object->cost();
     
116. echo $ice_object->getDescription();
     
117. 
     
118. // 购买一个沙冰+香草+草莓
     
119. $ice2 = new SlushIce();
     
120. $ice2 = new Herb($ice2);
     
121. $ice2 = new Berries($ice2);
     
122. echo $ice2->cost();
     
123. echo $ice2->getDescription();

是不是有些像递归调用