EnumLookup.php

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<?php
declare(strict_types=1);

namespace Magento\Framework\GraphQl\Query;

use Magento\Framework\GraphQl\Config\Element\Enum;
use Magento\Framework\GraphQl\ConfigInterface;
use Magento\Framework\GraphQl\Schema\Type\Enum\DataMapperInterface;
use Magento\Framework\Phrase;

class EnumLookup
{
    private $typeConfig;

    private $enumDataMapper;

    public function __construct(ConfigInterface $typeConfig, DataMapperInterface $enumDataMapper)
    {
        $this->typeConfig = $typeConfig;
        $this->enumDataMapper = $enumDataMapper;
    }

    public function getEnumValueFromField(string $enumName, string $fieldValue) : string
    {
        $priceViewEnum = $this->typeConfig->getConfigElement($enumName);
        if ($priceViewEnum instanceof Enum) {
            foreach ($priceViewEnum->getValues() as $enumItem) {
                $mappedValues = $this->enumDataMapper->getMappedEnums($enumName);
                if (isset($mappedValues[$enumItem->getName()]) && $mappedValues[$enumItem->getName()] == $fieldValue) {
                    return $enumItem->getValue();
                }
            }
        } else {
            throw new \Magento\Framework\Exception\RuntimeException(
                new Phrase('Enum type "%1" not defined', [$enumName])
            );
        }
        return '';
    }
}