draft/composite.php at master · hwanginsitein/draft · GitHub

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<?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
 */
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();