php设计模式Adapter(适配器模式)_PHP

/** 
* 适配器模式 
* 
* 将一个类的接口转换成客户希望的另外一个接口,使用原本不兼容的而不能在一起工作的那些类可以在一起工作 
*/ 

// 这个是原有的类型 
class OldCache 
{ 
public function __construct() 
{ 
echo "OldCache construct
"; 
} 

public function store($key,$value) 
{ 
echo "OldCache store
"; 
} 

public function remove($key) 
{ 
echo "OldCache remove
"; 
} 

public function fetch($key) 
{ 
echo "OldCache fetch
"; 
} 
} 

interface Cacheable 
{ 
public function set($key,$value); 
public function get($key); 
public function del($key); 
} 

class OldCacheAdapter implements Cacheable 
{ 
private $_cache = null; 
public function __construct() 
{ 
$this->_cache = new OldCache(); 
} 

public function set($key,$value) 
{ 
return $this->_cache->store($key,$value); 
} 

public function get($key) 
{ 
return $this->_cache->fetch($key); 
} 

public function del($key) 
{ 
return $this->_cache->remove($key); 
} 
} 

$objCache = new OldCacheAdapter(); 
$objCache->set("test",1); 
$objCache->get("test"); 
$objCache->del("test",1);