Search.php

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<?php
namespace Magento\Framework\Search;

use Magento\Framework\Api\Search\SearchInterface;
use Magento\Framework\Api\Search\SearchCriteriaInterface;
use Magento\Framework\App\ScopeResolverInterface;
use Magento\Framework\Search\Request\Builder;

class Search implements SearchInterface
{
    private $requestBuilder;

    private $scopeResolver;

    private $searchEngine;

    private $searchResponseBuilder;

    public function __construct(
        Builder $requestBuilder,
        ScopeResolverInterface $scopeResolver,
        SearchEngineInterface $searchEngine,
        SearchResponseBuilder $searchResponseBuilder
    ) {
        $this->requestBuilder = $requestBuilder;
        $this->scopeResolver = $scopeResolver;
        $this->searchEngine = $searchEngine;
        $this->searchResponseBuilder = $searchResponseBuilder;
    }

    public function search(SearchCriteriaInterface $searchCriteria)
    {
        $this->requestBuilder->setRequestName($searchCriteria->getRequestName());

        $scope = $this->scopeResolver->getScope()->getId();
        $this->requestBuilder->bindDimension('scope', $scope);

        foreach ($searchCriteria->getFilterGroups() as $filterGroup) {
            foreach ($filterGroup->getFilters() as $filter) {
                $this->addFieldToFilter($filter->getField(), $filter->getValue());
            }
        }

        $this->requestBuilder->setFrom($searchCriteria->getCurrentPage() * $searchCriteria->getPageSize());
        $this->requestBuilder->setSize($searchCriteria->getPageSize());
        $request = $this->requestBuilder->create();
        $searchResponse = $this->searchEngine->search($request);

        return $this->searchResponseBuilder->build($searchResponse)
            ->setSearchCriteria($searchCriteria);
    }

    private function addFieldToFilter($field, $condition = null)
    {
        if (!is_array($condition) || !in_array(key($condition), ['from', 'to'], true)) {
            $this->requestBuilder->bind($field, $condition);
        } else {
            if (!empty($condition['from'])) {
                $this->requestBuilder->bind("{$field}.from", $condition['from']);
            }
            if (!empty($condition['to'])) {
                $this->requestBuilder->bind("{$field}.to", $condition['to']);
            }
        }

        return $this;
    }
}