php设计模式——策略模式

/**
* 商场活动1，打折优惠收费方式，策略1
*/
class CashRebate{

public $rebate;	//打折额度<=1，正常收费情况下等于1
public function setActive($moneyRebate){
$this->rebate = $moneyRebate;
}

//具体实现收取现金方法
public function acceptCash($money){
return $money * $this->rebate;
}
}

/**
* 商场活动2，返现金收费方式，策略2
*/
class CashReturn{
public $moneyCondition;
public $moneyReturn;

public function setActive($moneyCondition, $moneyReturn){
$this->moneyCondition = $moneyCondition;
$this->moneyReturn = $moneyReturn;
}

//实现收费现金方法
public function acceptCash($money){
if($money >= $this->moneyCondition){
return $money - $this->moneyReturn;
}else{
return $money;
}
}
}

/**
* 简单工厂模式和策略模式相结合
*/
class cashContext{
public $obj;

//工厂模式，生成对应的处理策略对象
public function __construct($type){
switch ($type) {
case 'rebate':
$this->obj = new CashRebate();
break;
case 'return':
$this->obj = new CashReturn();
break;
}
}

//为各种情况的对象，设置参数
public function setRebate($rebate){
$this->obj->setActive($rebate);
}

public function setReturn($ondition, $return){
$this->obj->setActive($ondition, $return);
}

//最终获取实收用户现金的方法
public function acceptMoney($money){
return $this->obj->acceptCash($money);
}
}

//活动1使用：
$totalMoney = 1000; //商品总金额
$rebate = 0.8; //活动折扣
$cashObj = new cashContext('rebate');
$cashObj->setRebate($rebate);
$cashObj->acceptMoney($totalMoney);