IndexBuilder.php

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

use Magento\Framework\App\Config\ScopeConfigInterface;
use Magento\Framework\App\ResourceConnection;
use Magento\Framework\DB\Select;
use Magento\Framework\Search\Adapter\Mysql\ConditionManager;
use Magento\Framework\Search\Adapter\Mysql\IndexBuilderInterface;
use Magento\Framework\Search\RequestInterface;
use Magento\Framework\Indexer\ScopeResolver\IndexScopeResolver;
use Magento\Store\Model\StoreManagerInterface;
use Magento\Framework\App\ScopeResolverInterface;
use Magento\Framework\App\ObjectManager;
use Magento\CatalogSearch\Model\Search\FilterMapper\DimensionsProcessor;
use Magento\CatalogSearch\Model\Search\SelectContainer\SelectContainer;
use Magento\CatalogSearch\Model\Search\SelectContainer\SelectContainerBuilder;
use Magento\CatalogSearch\Model\Search\BaseSelectStrategy\StrategyMapper as BaseSelectStrategyMapper;
use Magento\CatalogSearch\Model\Search\BaseSelectStrategy\BaseSelectStrategyInterface;
use Magento\CatalogSearch\Model\Search\FilterMapper\FilterMapper;

class IndexBuilder implements IndexBuilderInterface
{
    private $dimensionsProcessor;

    private $selectContainerBuilder;

    private $baseSelectStrategyMapper;

    private $filterMapper;

    public function __construct(
        ResourceConnection $resource,
        ScopeConfigInterface $config,
        StoreManagerInterface $storeManager,
        ConditionManager $conditionManager,
        IndexScopeResolver $scopeResolver,
        TableMapper $tableMapper,
        ScopeResolverInterface $dimensionScopeResolver,
        DimensionsProcessor $dimensionsProcessor = null,
        SelectContainerBuilder $selectContainerBuilder = null,
        BaseSelectStrategyMapper $baseSelectStrategyMapper = null,
        FilterMapper $filterMapper = null
    ) {
        $this->dimensionsProcessor = $dimensionsProcessor ?: ObjectManager::getInstance()
            ->get(DimensionsProcessor::class);

        $this->selectContainerBuilder = $selectContainerBuilder ?: ObjectManager::getInstance()
            ->get(SelectContainerBuilder::class);

        $this->baseSelectStrategyMapper = $baseSelectStrategyMapper ?: ObjectManager::getInstance()
            ->get(BaseSelectStrategyMapper::class);

        $this->filterMapper = $filterMapper ?: ObjectManager::getInstance()
            ->get(FilterMapper::class);
    }

    public function build(RequestInterface $request)
    {
        $selectContainer = $this->selectContainerBuilder->buildByRequest($request);

        $baseSelectStrategy = $this->baseSelectStrategyMapper->mapSelectContainerToStrategy($selectContainer);

        $selectContainer = $baseSelectStrategy->createBaseSelect($selectContainer);
        $selectContainer = $this->filterMapper->applyFilters($selectContainer);
        $selectContainer = $this->dimensionsProcessor->processDimensions($selectContainer);

        return $selectContainer->getSelect();
    }
}