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php设计模式 Memento (备忘录模式)

WBOY
Release: 2016-05-22 17:20:26
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25种php设计模式,你全都知道吗?下面用代码介绍备忘录模式(Memento模式)

<?php
/**
 * 备忘录模式
 *
 * 在不破坏封装性的前提下,捕获一个对象的内部状态,并在该对象之外保存这个状态,这样以后就可以将该对象恢复到保存的状态
 */
class Memento {
    private $_state = null;
    public function __construct($state) {
        $this->_state = $state;
    }
    public function getState() {
        return $this->_state;
    }
}
class Caretaker {
    private $_memento = null;
    public function getMemento() {
        return $this->_memento;
    }
    public function setMemento($memento) {
        $this->_memento = $memento;
    }
}
class Originator {
    private $_state = null;
    public function getState() {
        return $this->_state;
    }
    public function setState($state) {
        $this->_state = $state;
    }
    public function createMemento() {
        returnnewMemento($this->_state);
    }
    public function setMemento($memento) {
        $this->_state = $memento->getState();
    }
    public function display() {
        echo "state = " . $this->_state . "<br/>";
    }
}
$objOriginator = new Originator();
$objOriginator->setState(0);
$objOriginator->display();
$objCareTaker = new CareTaker();
$objCareTaker->setMemento($objOriginator->createMemento());
$objOriginator->setState(1);
$objOriginator->display();
$objOriginator->setMemento($objCareTaker->getMemento());
$objOriginator->display();
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其他相关设计模式:

备忘录模式(Memento模式)
观察者模式(Observer模式)
模板方法模式(Template Method模式)
命令模式(command模式)
组合模式(composite模式)
享元模式(flyweight模式)
策略模式(strategy模式)
状态模式(state模式)
适配器模式(adapter模式)
工厂模式(factory模式)
原型模式(prototype模式)
外观模式(facade模式)
单例模式(singleton模式)
桥梁模式(bridge模式)
装饰模式(decorator模式)
抽象工厂模式(abstract factory模式)
建造者模式(Builder模式)
访问者模式(Visitor模式)
解释器模式(Interpreter模式)
中介者模式(Mediator模式)
职责链模式(Chain Of Responsibility模式)
代理模式(Proxy模式)
迭代器模式(Interator模式)
数据访问对象模式(DAO模式)
委托模式(Delegation模式)


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