IsNull.php

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<?php

declare(strict_types=1);

namespace ILIAS\Refinery;

use ILIAS\Refinery\Custom\Constraint;
use ILIAS\Data;

class IsNull extends Constraint
{
    public function __construct(Data\Factory $data_factory, \ILIAS\Language\Language $lng)
    {
        parent::__construct(
            static function ($value): bool {
                return is_null($value);
            },
            static function ($txt, $value): string {
                return $txt("not_a_null", gettype($value));
            },
            $data_factory,
            $lng
        );
    }
}