每日一模式之php的适配器模式

/**
* 适配器模式 :将某一个对象的接口适配为另外一个
*/

interface Seller{
public function sell();
}

//场景：中草药，直接买，特别处理后卖掉
class HerbalMedicine {
private $_medicine,$_pick_date,$_keep_time;
public function __construct($medicine){
$this->_medicine = $medicine;
}

public function getMedicne(){
return $this->_medicine;
}
//and so on
}

//直接出售
class RedictMedicineSeller implements Seller{
private $_medicine;
public function __construct($medicine_obj){
$this->_medicine = $medicine_obj;
}
public function sell(){
echo $this->_medicine->getMedicne()." redict sell \n";
}
}

$herbarl_obj = new HerbalMedicine("中草药");
$redict_obj = new RedictMedicineSeller($herbarl_obj);
$redict_obj->sell();

//提取这个动作可能不仅仅是ExtractMedicineSeller 用到
//不能用ExtractMedicineSeller 的方法代替提取
class HerbalMedicineAdapter extends HerbalMedicine{

public function __construct($medicine){
parent::__construct($medicine);
$this->extract($medicine);
}
public function extract(){
echo "extract medicine \n";
}
}

//比如提取出青蒿素处理后出售
class  ExtractMedicineSeller  implements Seller{
private $_medicine;
public function __construct($medicine_obj){
$this->_medicine = $medicine_obj;
}
public function sell(){
echo $this->_medicine->getMedicne()." extract sell \n";
}
}

$herbarl_adapter_obj = new HerbalMedicineAdapter("中草药");
$extract_obj = new ExtractMedicineSeller($herbarl_adapter_obj);
$extract_obj->sell();

//适配器模式说的是同源，处理后适用不同的对象
//如果不做适配处理可能会影响以前的功能，或者会任意添加方法，类的功能不再单一，不方便以后的扩张