[php]php设计模式 Composite (组合模式)

<?php
  2 /**
  3  * 组合模式
  4  *
  5  * 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
  6 */
  7 abstractclass MenuComponent
  8 {
  9 publicfunction add($component){}
 10 publicfunction remove($component){}
 11 publicfunction getName(){}
 12 publicfunction getUrl(){}
 13 publicfunction display(){}
 14 }
 15 
 16 class Menu extends MenuComponent
 17 {
 18 private$_items=array();
 19 private$_name=null;
 20 
 21 publicfunction __construct($name)
 22     {
 23 $this->_name =$name;
 24     }
 25 
 26 publicfunction add($component)
 27     {
 28 $this->_items[] =$component;
 29     }
 30 
 31 publicfunction remove($component)
 32     {
 33 $key=array_search($component,$this->_items);
 34 if($key!==false) unset($this->_items[$key]);
 35     }
 36 
 37 publicfunction display()
 38     {
 39 echo"-- ".$this->_name." ---------<br/>";
 40 foreach($this->_items as$item)
 41         {
 42 $item->display();
 43         }
 44     }
 45 }
 46 
 47 class Item extends MenuComponent
 48 {
 49 private$_name=null;
 50 private$_url=null;
 51 
 52 publicfunction __construct($name,$url)
 53     {
 54 $this->_name =$name;
 55 $this->_url =$url;
 56     }
 57 
 58 publicfunction display()
 59     {
 60 echo$this->_name."#".$this->_url."<br/>";
 61     }
 62 }
 63 
 64 class Client
 65 {
 66 private$_menu=null;
 67 
 68 publicfunction __construct($menu)
 69     {
 70 $this->_menu =$menu;
 71     }
 72 
 73 publicfunction setMenu($menu)
 74     {
 75 $this->_menu =$menu;
 76     }
 77 
 78 publicfunction displayMenu()
 79     {
 80 $this->_menu->display();
 81     }
 82 }
 83 
 84 // 实例一下
 85 // 创建menu
 86 $subMenu1=new Menu("sub menu1");
 87 $subMenu2=new Menu("sub menu2"); 
 88 $subMenu3=new Menu("sub menu3"); 
 89 
 90 $item1=new Item("163","www.163.com");
 91 $item2=new Item("sina","www.sina.com");
 92 
 93 $subMenu1->add($item1);
 94 $subMenu1->add($item2);
 95 
 96 $item3=new Item("baidu","www.baidu.com");
 97 $item4=new Item("google","www.google.com");
 98 $subMenu2->add($item3);
 99 $subMenu2->add($item4);
100 
101 $allMenu=new Menu("All Menu");
102 $allMenu->add($subMenu1);
103 $allMenu->add($subMenu2);
104 $allMenu->add($subMenu3);
105 
106 $objClient=new Client($allMenu);
107 $objClient->displayMenu();
108 
109 $objClient->setMenu($subMenu2);
110 $objClient->displayMenu();