composite-pattern.php

<?php


/**
 * 组合模式
 *
 * @abstract 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
 * @author   xjin
 * @version  20150306
 */

// 抽象类
abstract class MenuComponent {

    // 添加
    public function add($component)
    {
    }

    //删除
    public function remove($component)
    {
    }

    // 获取名称
    public function getName()
    {
    }

    // 获取URL
    public function getUrl()
    {
    }

    // 显示目录
    public function display()
    {
    }
}


// 目录主结构
class Menu extends MenuComponent {
    private $_items = array();
    private $_name = null;

    public function __construct($name)
    {
        $this->_name = $name;
    }

    // 添加目录
    public function add($component)
    {
        $this->_items[] = $component;
    }

    // 删除子目录
    public function remove($component)
    {
        $key = array_search($component, $this->_items);
        if ($key !== false) unset($this->_items[$key]);
    }

    // 显示目录结构
    public function display()
    {
        echo "-- " . $this->_name . " ---------<br/>";
        foreach ( $this->_items as $item )
        {
            $item->display();
        }
    }
}


// 子目录
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);

//  组合所有目录
$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();