IndexStructureFactory.php

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<?php
namespace Magento\CatalogSearch\Model\Indexer;

use Magento\Framework\Indexer\IndexStructureInterface;
use Magento\Framework\ObjectManagerInterface;
use Magento\Framework\Search\EngineResolverInterface;

class IndexStructureFactory
{
    protected $objectManager = null;

    protected $structures = null;
    private $engineResolver;

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

    public function create(array $data = [])
    {
        $currentStructure = $this->engineResolver->getCurrentSearchEngine();
        if (!isset($this->structures[$currentStructure])) {
            throw new \LogicException(
                'There is no such index structure: ' . $currentStructure
            );
        }
        $indexStructure = $this->objectManager->create($this->structures[$currentStructure], $data);

        if (!$indexStructure instanceof IndexStructureInterface) {
            throw new \InvalidArgumentException(
                $currentStructure . ' index structure doesn\'t implement '. IndexStructureInterface::class
            );
        }

        return $indexStructure;
    }
}