PHP之装饰器模式

来源：互联网发布：java将链接生成二维码编辑：程序博客网时间：2024/04/27 18:53

<?php
abstract class AbstractRating {
   protected $decoratable;
   public function __construct( $decoratable ) {
       $this -> decoratable = $decoratable;
   }
   abstract public function getRating();
}

class PoorRating extends AbstractRating {
   protected $rating = 1;
   public function __construct($decoratable) {
       parent::__construct( $decoratable );
   }
   public function getRating() {
       return $this -> decoratable -> getRating() + $this -> rating;
   }
}

class AverageRating extends AbstractRating {
   protected $rating = 2;
   public function __construct( $decoratable ) {
       parent::__construct( $decoratable );
   }
   public function getRating() {
       return $this -> decoratable -> getRating() + $this -> rating;
   }
}

class GoodRating extends AbstractRating {
   protected $rating = 3;
   public function __construct( $decoratable ) {
       parent::__construct( $decoratable );
   }
   public function getRating() {
       return $this -> decoratable -> getRating() + $this -> rating;
   }
}

class Ratings {
   private $rating = 3;
   public function __construct() { }
   public function getRating() {
       return $this -> rating; // typeof integer
   }
}
$rating = new GoodRating( new AverageRating( new Ratings ) );     // we are decorating the Ratings object
echo($rating -> getRating());
?>