php桥接模式的实例用法及代码分析

/**
 * 颜色抽象类
 * Class Colour
 */
abstract class Colour
{
    /**
     * @return mixed
     */
    abstract public function run();
}
 
 
/**
 * 黑色
 * Class Black
 */
class Black extends Colour
{
    public function run()
    {
        // TODO: Implement run() method.
        return '黑色';
    }
}
 
 
/**
 * 白色
 * Class White
 */
class White extends Colour
{
    public function run()
    {
        // TODO: Implement run() method.
        return '白色';
    }
}
 
 
/**
 * 红色
 * Class Red
 */
class Red extends Colour
{
    public function run()
    {
        // TODO: Implement run() method.
        return '红色';
    }
}
 
 
/**
 * 形状抽象类
 * Class Shape
 */
abstract class Shape
{
    /**
     * 颜色
     * @var Colour
     */
    protected $colour;
 
 
    /**
     * Shape constructor.
     * @param Colour $colour
     */
    public function __construct(Colour $colour)
    {
        $this->colour = $colour;
    }
 
 
    /**
     * @return mixed
     */
    abstract public function operation();
}
 
 
/**
 * 圆形
 * Class Round
 */
class Round extends Shape
{
    /**
     * @return mixed|void
     */
    public function operation()
    {
        // TODO: Implement operation() method.
        echo $this->colour->run() . '圆形<br>';
    }
}
 
 
/**
 * 长方形
 * Class Rectangle
 */
class Rectangle extends Shape
{
    /**
     * @return mixed|void
     */
    public function operation()
    {
        // TODO: Implement operation() method.
        echo $this->colour->run() . '长方形<br>';
    }
}
 
 
/**
 * 正方形
 * Class Square
 */
class Square extends Shape
{
    /**
     * @return mixed|void
     */
    public function operation()
    {
        // TODO: Implement operation() method.
        echo $this->colour->run() . '正方形<br>';
    }
}
 
 
// 客户端代码
// 白色圆形
$whiteRound = new Round(new White());
$whiteRound->operation();
 
// 黑色正方形
$blackSquare = new Square(new Black());
$blackSquare->operation();
 
// 红色长方形
$redRectangle = new Rectangle(new Red());
$redRectangle->operation();