php设计模式 Composite (组合模式)

<?php 
/** 
* 组合模式 
* 
* 将对象组合成树形结构以表示"部分-整体"的层次结构,使得客户对单个对象和复合对象的使用具有一致性 
*/ 
abstract class menucomponent 
{ 
public function add($component){}
public function remove($component){}
public function getname(){}
public function geturl(){}
public function display(){}
}
class menu extends menucomponent
{
private $_items = array();
private $_name = null;
public function __construct($name)
{
$this->_name = $name;
}
public function add($component)
{
$this->_items[] = $component;
}
public function remove($component)
{
$key = array_search($component,$this->_items);
if($key !== false) unset($this->_items[$key]);
}
public function display()
{
echo "-- ".$this->_name." ---------<br/>";
foreach($this->_items as $item)
{
$item->display();
}
}
}
class item extends menucomponent
{
private $_name = null;
private $_url = null;
public function __construct($name,$url)
{
$this->_name = $name;
$this->_url = $url;
}
public function display()
{
echo $this->_name."#".$this->_url."<br/>";
}
}
class client
{
private $_menu = null;
public function __construct($menu)
{
$this->_menu = $menu;
}
public function setmenu($menu)
{
$this->_menu = $menu;
}
public function displaymenu()
{
$this->_menu->display();
}
}
// 实例一下
// 创建menu
$submenu1 = new menu("sub menu1");
$submenu2 = new menu("sub menu2");
$submenu3 = new menu("sub menu3");
$item1 = new item("163","www.163.com");
$item2 = new item("sina","www.sina.com");
$submenu1->add($item1);
$submenu1->add($item2);
$item3 = new item("baidu","www.baidu.com");
$item4 = new item("google","www.google.com");
$submenu2->add($item3);
$submenu2->add($item4);
$allmenu = new menu("all menu");
$allmenu->add($submenu1);
$allmenu->add($submenu2);
$allmenu->add($submenu3);
$objclient = new client($allmenu);
$objclient->displaymenu();
$objclient->setmenu($submenu2);
$objclient->displaymenu();