php設計模式 Memento (備忘錄模式)

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 1 <?php
 2 /**
 3  * 備忘錄模式
 4  *
 5  * 在不破壞封裝性的前提下,捕獲一個對象的內部狀態,並在該對象之外儲存這個狀態,這樣以後就可以將該對象恢複到儲存的狀態
 6  */
 7 class Memento
 8 {
 9     private $_state = null;
10 
11     public function __construct($state)
12     {
13         $this->_state = $state;
14     }
15 
16     public function getState()
17     {
18         return $this->_state;
19     }
20 }
21 
22 class Caretaker
23 {
24     private $_memento = null;
25 
26     public function getMemento()
27     {
28         return $this->_memento;
29     }
30 
31     public function setMemento($memento)
32     {
33         $this->_memento = $memento;
34     }
35 }
36 
37 class Originator
38 {
39     private $_state = null;
40 
41     public function getState()
42     {
43         return $this->_state;
44     }
45 
46     public function setState($state)
47     {
48         $this->_state = $state;
49     }
50 
51     public function createMemento()
52     {
53         return new Memento($this->_state);
54     }
55 
56     public function setMemento($memento)
57     {
58         $this->_state = $memento->getState();
59     }
60 
61     public function display()
62     {
63         echo "state = ".$this->_state."<br/>";
64     }
65 }
66 
67 $objOriginator = new Originator();
68 $objOriginator->setState(0);
69 $objOriginator->display();
70 
71 $objCareTaker = new CareTaker();
72 $objCareTaker->setMemento($objOriginator->createMemento());
73 
74 $objOriginator->setState(1);
75 $objOriginator->display();
76 
77 $objOriginator->setMemento($objCareTaker->getMemento());
78 $objOriginator->display();

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