DataMapperFactory.php

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<?php
namespace Magento\Elasticsearch\Model\Adapter\BatchDataMapper;

use Magento\Framework\ObjectManagerInterface;
use Magento\Framework\Exception\NoSuchEntityException;
use Magento\Framework\Exception\ConfigurationMismatchException;
use Magento\Elasticsearch\Model\Adapter\BatchDataMapperInterface;

class DataMapperFactory
{
    private $objectManager;

    private $dataMappers;

    public function __construct(
        ObjectManagerInterface $objectManager,
        array $dataMappers = []
    ) {
        $this->objectManager = $objectManager;
        $this->dataMappers = $dataMappers;
    }

    public function create($entityType)
    {
        if (!isset($this->dataMappers[$entityType])) {
            throw new NoSuchEntityException(
                __(
                    'There is no such data mapper "%1" for interface %2',
                    $entityType,
                    BatchDataMapperInterface::class
                )
            );
        }
        $dataMapperClass = $this->dataMappers[$entityType];
        $dataMapperEntity = $this->objectManager->create($dataMapperClass);
        if (!$dataMapperEntity instanceof BatchDataMapperInterface) {
            throw new ConfigurationMismatchException(
                __(
                    'Data mapper "%1" must implement interface %2',
                    $dataMapperClass,
                    BatchDataMapperInterface::class
                )
            );
        }

        return $dataMapperEntity;
    }
}