php - 这也违反得墨​​忒尔定律？或者扭曲它会是一种矫枉过正吗？

Question

很简单的一点:

class Point
{
    private $x, $y;

    public function __constructor($x, $y)
    {
        $this->x = $x;
        $this->y = $y;
    }

    public function getX()
    {
        return $this->x;
    }

    public function getY()
    {
        return $this->y;
    }
}

和一个圆圈

class Circle
{
    private $r;
    private $point;

    public function __constructor (Point $point, $r)
    {
        $this->point = $point;
        $this->r = $r;
    }

    public function getPoint() // here is the law breaking
    {
        return $this->point;
    }
}

$circle = new Circle(new Point(1,2), 10);
$circle->getPoint()->getX(); // here is the law breaking
$circle->getPoint()->getY(); // here is the law breaking

当然它违反了得墨忒耳定律。所以让我折射它:

class Circle
{
    private $r;
    private $point;

    public function __constructor (Point $point, $r)
    {
        $this->point = $point;
        $this->r = $r;
    }

    public function getPointX()
    {
        return $this->point->getX();
    }

    public function getPointY()
    {
        return $this->point->getY();
    }
}

$circle = new Circle(new Point(1,2), 10);
$circle->getPointX();
$circle->getPointY();

除了它看起来更好之外，我没有看到任何优势 - 只是两个额外的包装功能。从技术上讲，我再次拥有对 Point 的完全访问权限，并且无法将更多方法添加到 Point。第二种折射法还值得用吗？

Answer 1

除了这是一个基于意见的问题之外，我会这样做:

class Circle extends Point
{
    private $r;

    public function __constructor (Point $point, $r)
    {
        $this->x = $point->getPointX();
        $this->y = $point->getPointY();
        $this->r = $r;
    }
}

$circle = new Circle(new Point(1,2), 10);
$circle->getPointX();
$circle->getPointY();