设计模式之: 装饰器模式

<?php
abstract class IComponent
{
    protected $site;
    abstract public function getSite();
    abstract public function getPrice();
}

<?php
abstract class Decorator extends IComponent
{
    /*
    任务是维护Component的引用
    继承getSite()和getPrice()
    因为仍然是抽象类,所以不需要实现父类任何一个抽象方法
    */
}

<?php
class BasicSite extends IComponent
{
    public function __construct()
    {
        $this->site = "Basic Site";
    }
    public function getSite()
    {
        return $this->site;
    }
    public function getPrice()
    {
        return 1200;
    }
}

<?php
class Maintenance extends Decorator
{
    public function __construct(IComponent $siteNow)
    {
        $this->site = $siteNow;
    }
    public function getSite()
    {
        $format = "<br />  Maintenance";
        return $this->site->getSite() . $format;
    }
    public function getPrice()
    {
        return 950 + $this->site->getPrice();
    }
}

<?php
class Video extends Decorator
{
    public function __construct(IComponent $siteNow)
    {
        $this->site = $siteNow;
    }
    public function getSite()
    {
        $format = "<br />  Video";
        return $this->site->getSite() . $format;
    }
    public function getPrice()
    {
        return 350 + $this->site->getPrice();
    }
}

<?php
class DataBase extends Decorator
{
    public function __construct(IComponent $siteNow)
    {
        $this->site = $siteNow;
    }
    public function getSite()
    {
        $format = "<br />  DataBase";
        return $this->site->getSite() . $format;
    }
    public function getPrice()
    {
        return 800 + $this->site->getPrice();
    }
}

<?php
function __autoload($class_name)
{
    include $class_name . ‘.php‘;
}
class Client
{
    private $basicSite;
    public function __construct()
    {
        $this->basicSite = new BasicSite();
        $this->basicSite = $this->WrapComponent($this->basicSite);
        $siteShow = $this->basicSite->getSite();
        $format = "<br />  <strong>Total= $";
        $price = $this->basicSite->getPrice();
        echo $siteShow . $format . $price . "</strong>";
    }
    private function WrapComponent(IComponent $component)
    {
        $component = new Maintenance($component);
        $component = new Video($component);
        $component = new DataBase($component);
        return $component;
    }
}
$worker = new Client();