[PHP] 装饰器模式-结构型设计模式

interface Booking{
    public function getDescription(): string;
}

abstract class BookingDecorator implements Booking{
    protected Booking $booking;
    public function __construct(Booking $booking)
    {
        $this->booking = $booking;
    }
}

class DoubleRoomBooking implements Booking
{
    public function getDescription(): string{
        return 'double room';
    }
}

class WiFi extends BookingDecorator{
    public function getDescription(): string
    {
        return $this->booking->getDescription() . ' with wifi';
    }
}
class ExtraBed extends BookingDecorator
{
    public function calculatePrice(): int
    {
        return $this->booking->calculatePrice() + self::PRICE;
    }
    public function getDescription(): string {
        return $this->booking->getDescription() . ' with extra bed';
    }
}