结构型--组合模式

设计模式

• 组件
• 树枝节点
• 叶子节点

透明模式

组件抽象类

<?php
/**
 * Component.php
 *
 * @package   sy-records/design-patterns
 * @author    Luffy (lufei@swoole.com)
 * @date      2019/11/22
 * @copyright Swoole, Inc.
 */
namespace Luffy\DesignPatterns\Composite\Transparent;
abstract class Component
{
    /**
     * @var
     */
    protected $name;
    /**
     * Component constructor.
     *
     * @param $name
     */
    public function __construct($name)
    {
        $this->name = $name;
    }
    /**
     * @param  Component $component
     * @return mixed
     */
    abstract public function add(Component $component);
    /**
     * @return mixed
     */
    abstract public function getName();
}

树枝节点类

<?php
/**
 * Dir.php
 *
 * @package   sy-records/design-patterns
 * @author    Luffy (lufei@swoole.com)
 * @date      2019/11/22
 * @copyright Swoole, Inc.
 */
namespace Luffy\DesignPatterns\Composite\Transparent;
class Dir extends Component
{
    /**
     * @var array
     */
    protected $children = [];
    /**
     * @param Component $component
     */
    public function add(Component $component)
    {
        $this->children[] = $component;
    }
    public function getName()
    {
        $nameStr = $this->name ."\n";
        foreach ($this->children as $k => $v) {
            $nameStr .= "--" . $v->getName();
        }
        return $nameStr; 
    }
}

叶子节点类

<?php
/**
 * File.php
 *
 * @package   sy-records/design-patterns
 * @author    Luffy (lufei@swoole.com)
 * @date      2019/11/22
 * @copyright Swoole, Inc.
 */
namespace Luffy\DesignPatterns\Composite\Transparent;
class File extends Component
{
    /**
     * @param  Component $component
     * @throws \Exception
     */
    public function add(Component $component)
    {
        throw new \Exception("文件不能添加子节点");
    }
    /**
     * @return string
     */
    public function getName()
    {
        return "--" . $this->name . "\n";
    }
}

客户端调用

<?php
/**
 * Client.php
 *
 * @package   sy-records/design-patterns
 * @author    Luffy (lufei@swoole.com)
 * @date      2019/11/22
 * @copyright Swoole, Inc.
 */
namespace Luffy\DesignPatterns\Composite\Transparent;
require __DIR__ . '/../../vendor/autoload.php';
class Client
{
    public static function run()
    {
        $composite = new Dir("Composite");
        $transparent = new Dir("Transparent");
        $composite->add($transparent);
        $componentFile = new File("Component.php");
        $dirFile = new File("Dir.php");
        $fileFile = new File("File.php");
        $clientFile = new File("Client.php");
        $transparent->add($componentFile);
        $transparent->add($dirFile);
        $transparent->add($fileFile);
        $transparent->add($clientFile);
        $testFile = new File("test.php");
        $clientFile->add($testFile);
        echo $composite->getName();
    }
}
Client::run();

安全模式

组件抽象类

<?php
/**
 * Component.php
 *
 * @package   sy-records/design-patterns
 * @author    Luffy (lufei@swoole.com)
 * @date      2019/11/22
 * @copyright Swoole, Inc.
 */
namespace Luffy\DesignPatterns\Composite\Safe;
abstract class Component
{
    /**
     * @var
     */
    protected $name;
    /**
     * Component constructor.
     *
     * @param $name
     */
    public function __construct($name)
    {
        $this->name = $name;
    }
    /**
     * @return mixed
     */
    abstract public function getName();
}

树枝节点类

<?php
/**
 * Dir.php
 *
 * @package   sy-records/design-patterns
 * @author    Luffy (lufei@swoole.com)
 * @date      2019/11/22
 * @copyright Swoole, Inc.
 */
namespace Luffy\DesignPatterns\Composite\Safe;
class Dir extends Component
{
    /**
     * @var array
     */
    protected $children = [];
    /**
     * @param Component $component
     */
    public function add(Component $component)
    {
        $this->children[] = $component;
    }
    public function getName()
    {
        $nameStr = $this->name ."\n";
        foreach ($this->children as $k => $v) {
            $nameStr .= "--" . $v->getName();
        }
        return $nameStr; 
    }
}

叶子节点类

<?php
/**
 * File.php
 *
 * @package   sy-records/design-patterns
 * @author    Luffy (lufei@swoole.com)
 * @date      2019/11/22
 * @copyright Swoole, Inc.
 */
namespace Luffy\DesignPatterns\Composite\Safe;
class File extends Component
{
    /**
     * @return string
     */
    public function getName()
    {
        return "--" . $this->name . "\n";
    }
}

客户端调用类

<?php
/**
 * Client.php
 *
 * @package   sy-records/design-patterns
 * @author    Luffy (lufei@swoole.com)
 * @date      2019/11/22
 * @copyright Swoole, Inc.
 */
namespace Luffy\DesignPatterns\Composite\Safe;
require __DIR__ . '/../../vendor/autoload.php';
class Client
{
    public static function run()
    {
        $composite = new Dir("Composite");
        $safe = new Dir("Safe");
        $composite->add($safe);
        $componentFile = new File("Component.php");
        $dirFile = new File("Dir.php");
        $fileFile = new File("File.php");
        $clientFile = new File("Client.php");
        $safe->add($componentFile);
        $safe->add($dirFile);
        $safe->add($fileFile);
        $safe->add($clientFile);
        echo $composite->getName();
    }
}
Client::run();

参考资料:
swoole微课堂
示例代码