大话设计模式-备忘录模式

//发起人类
class Originator {

public function __get($key) {
return isset($this->$key) ? $this->$key : null;
}

public function __set($key, $value) {
$this->$key = $value;
}

//需要保存的属性，可能有多个
private $state;

//创建备忘录，将当前需要保存的信息导入并实例化出一个Memento对象
public function createMemento() {
return new Memento($this->state);
}

//恢复备忘录，将Memento导入
public function setMemento(Memento $memento) {
$this->state = $memento->state;
}

public function show() {
echo 'state = '.$this->state.'<br/>';
}

}

//备忘录类
class Memento {

public function __get($key) {
return isset($this->$key) ? $this->$key : null;
}

public function __set($key, $value) {
$this->$key = $value;
}

//需要保存的数据属性，可以是多个
private $state;

//构造方法，将相关数据导入
function __construct($state) {
$this->state = $state;
}
}

//管理者类
class Caretaker {
private $memento;

public function __get($key) {
return isset($this->$key) ? $this->$key : null;
}

public function __set($key, $value) {
$this->$key = $value;
}
}

$o = new Originator();
//Originator初始状态，状态属性为‘On’
$o->state = 'On';
$o->show();

//保存状态时，由于有了很好的封装，可以隐藏Orginator的实现细节
$c = new Caretaker();
$c->memento = $o->createMemento();

//Originator改变了状态属性为‘Off’
$o->state = 'Off';
$o->show();

//恢复原初状态
$o->setMemento($c->memento);
$o->show();

class GameRole {
public function __get($key) {
return isset($this->$key) ? $this->$key : null;
}

public function __set($key, $value) {
$this->$key = $value;
}
//生命力
private $vit;

//攻击力
private $atk;

//防御力
private $def;

//状态显示
public function stateDisplay() {
echo '角色当前状态：<br/>';
echo '体力：'.$this->vit.'<br/>';
echo '攻击力'.$this->atk.'<br/>';
echo '防御力'.$this->def.'<br/><br/>';
}

//获得初始状态
public function getInitState() {
$this->vit = 100;
$this->atk = 100;
$this->def = 100;
}

//战斗
public function fight() {
$this->vit = 0;
$this->atk = 0;
$this->def = 0;
}

//保存角色状态
public function saveState() {
return new RolestateMemento($this->vit, $this->atk, $this->def);
}

//恢复角色状态
public function recoveryState(RoleStateMemento $memento) {
$this->vit = $memento->vit;
$this->atk = $memento->atk;
$this->def = $memento->def;
}
}

//角色状态储存箱
class RoleStateMemento {
private $vit;
private $atk;
private $def;
public function __get($key) {
return isset($this->$key) ? $this->$key : null;
}

public function __set($key, $value) {
$this->$key = $value;
}
public function __construct($vit, $atk, $def) {
$this->vit = $vit;
$this->atk = $atk;
$this->def = $def;
}
}

//角色状态管理者
class RoleStateCaretaker {
private $memento;
public function __get($key) {
return isset($this->$key) ? $this->$key : null;
}

public function __set($key, $value) {
$this->$key = $value;
}
}

//客户端
//大战Boss前
$lixiaoyao = new GameRole();
//游戏角色初始化状态，三项指标数值都是100
$lixiaoyao->getInitState();
$lixiaoyao->stateDisplay();

//保存进度
//保存进度时，由于封装在Memento中，因此我们并不知道保存了哪些具体的角色数据
$stateAdmin = new RoleStateCaretaker();
$stateAdmin->memento = $lixiaoyao->saveState();

//大战Boss时，损耗严重
$lixiaoyao->fight();
$lixiaoyao->stateDisplay();

//恢复之前状态
$lixiaoyao->recoveryState($stateAdmin->memento);
$lixiaoyao->stateDisplay();