<?php

class Range implements \JsonSerializable
{
    private $min;
    private $max;

    public function __construct($min = null, $max = null)
    {
        $this->min = $min;
        $this->max = $max;
    }

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

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

    public function isNull()
    {
        return $this->min === null && $this->max === null;
    }

    public function isNotNull()
    {
        return !$this->isNull();
    }

    public function jsonSerialize(): mixed
    {
        return [
            'min' => $this->min,
            'max' => $this->max,
        ];
    }
}