5、设计模式之组合模式(Composite)

问题:

  1. 对于树形结构，当容器对象（如文件夹）的某一个方法被调用是，将遍历这个树形结构，寻找也包含这个方法的成员对象并调用执行。（实现文件夹的递归）

  2. 客户端希望一致地处理容器对象和叶子对象

详解: Composite Pattern (整体-部分模式)

  1. 抽象组件类(Component 父类 接口)

  2. 叶子节点类(Leaf 子类)

  3. 独立集合类(Composite支干 子类)

php

    <?php
    /**
    * Created by PhpStorm.
    * User: zhang
    * Date: 2016/10/24
    * Time: 17:14
    */

    abstract class MenuComponent
    {
            public $name;
            public abstract function getName();
            public abstract function add(MenuComponent $menu);
            public abstract function remove(MenuComponent $menu);
            public abstract function getChild($i);
            public abstract function show();
    }

    class MenuItem extends MenuComponent{
        public function __construct($name)
        {
            $this->name = $name;
        }

        public function getName()
        {
            // TODO: Implement getName() method.
            return $this->name;
        }

        public function add(MenuComponent $menu)
        {
            // TODO: Implement add() method.
            return false;
        }

        public function remove(MenuComponent $menu)
        {
            // TODO: Implement remove() method.
            return false;
        }

        public function getChild($i)
        {
            // TODO: Implement getChild() method.
            return null;
        }

        public function show()
        {
            // TODO: Implement show() method.
            echo "|".$this->getName()."\n";
        }
        }

    class Menu extends MenuComponent{
            public $menuComponents = array();
            public function __construct($name)
            {
                $this->name = $name;
            }
            public function getName()
            {
                // TODO: Implement getName() method.
                return $this->name;
            }
            public function add(MenuComponent $menu)
            {
                // TODO: Implement add() method.
                $this->menuComponents[] = $menu;
            }
            public function remove(MenuComponent $menu)
            {
                // TODO: Implement remove() method.
                $key = array_search($menu,$this->menuComponents);
                if($key !== false){unset($this->menuComponents[$key]);}
            }
            public function getChild($i)
            {
                // TODO: Implement getChild() method.
                if(isset($this->menuComponents[$i])) return $this->menuComponents[$i];
                return null;
            }
            public function show()
            {
                // TODO: Implement show() method.
                echo "#".$this->getName()."\n";
                foreach($this->menuComponents as $v)
                {
                    $v->show();
                }
            }
    }

    class testDriver
    {
        public function run()
        {
            $menu1 = new Menu('文学');
            $menuitem1 = new MenuItem('绘画');
            $menuitem2 = new MenuItem('书法');
            $menuitem3 = new MenuItem('小说');
            $menuitem4 = new MenuItem('雕刻');
            $menu1->add($menuitem1);
            $menu1->add($menuitem2);
            $menu1->add($menuitem3);
            $menu1->add($menuitem4);
            $menu1->show();
        }
    }

    $test = new testDriver();
    $test->run();

javascript

php代码

参考文档