Operator.php

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<?php
declare(strict_types=1);

namespace Magento\Framework\GraphQl\Query\Resolver\Argument\Filter;

use Magento\Framework\Phrase;

class Operator
{
    const __DEFAULT = self::AND;

    const OR = 'or';

    const AND = 'and';

    private $value;

    public function __construct(string $value = null)
    {
        if (!$value) {
            $value = self::AND;
        }
        $type = new \ReflectionClass($this);
        if (!in_array($value, $type->getConstants())) {
            throw new \Magento\Framework\GraphQl\Exception\GraphQlInputException(
                new Phrase('%1 operator not supported', [$value])
            );
        }
        $this->value = $value;
    }

    public static function getOperators() : array
    {
        $type = new \ReflectionClass(Operator::class);
        return $type->getConstants();
    }

    public function __toString() : string
    {
        return strtoupper($this->value);
    }
}