[php]php设计模式 Bridge (桥接模式)

<?php
 2 /**
 3  * 桥接模式
 4  *
 5  * 将抽象部份与它实现部分分离,使用它们都可以有独立的变化
 6 */
 7 abstractclass Implementor
 8 {
 9 abstractpublicfunction operation();
10 }
11 
12 class ConcreteImplementorA extends Implementor
13 {
14 publicfunction operation()
15     {
16 echo"ConcreteImplementorA Operation<br/>";
17     }
18 }
19 
20 class ConcreteImplementorB extends Implementor
21 {
22 publicfunction operation()
23     {
24 echo"ConcreteImplementorB Operation<br/>";
25     }
26 }
27 
28 class Abstraction
29 {
30 protected$_implementor=null;
31 
32 publicfunction setImplementor($implementor)
33     {
34 $this->_implementor =$implementor;
35     }
36 
37 publicfunction operation()
38     {
39 $this->_implementor->operation();
40     }
41 }
42 
43 class RefinedAbstraction extends Abstraction
44 {
45 }
46 
47 class ExampleAbstraction extends Abstraction
48 {
49 }
50 
51 //
52 $objRAbstraction=new RefinedAbstraction();
53 $objRAbstraction->setImplementor(new ConcreteImplementorB());
54 $objRAbstraction->operation();
55 
56 $objRAbstraction->setImplementor(new ConcreteImplementorA());
57 $objRAbstraction->operation();
58 
59 $objEAbstraction=new ExampleAbstraction();
60 $objEAbstraction->setImplementor(new ConcreteImplementorB());
61 $objEAbstraction->operation();