ConditionsToCollectionApplier.php

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<?php
declare(strict_types=1);

namespace Magento\CatalogRule\Model\ResourceModel\Product;

use Magento\Catalog\Model\ResourceModel\Product\Collection as ProductCollection;
use Magento\CatalogRule\Model\Rule\Condition\Combine;
use Magento\Framework\Exception\InputException;
use Magento\CatalogRule\Model\Rule\Condition\ConditionsToSearchCriteriaMapper;
use Magento\Framework\Api\SearchCriteria\CollectionProcessor\AdvancedFilterProcessor;
use Magento\CatalogRule\Model\Rule\Condition\MappableConditionsProcessor;

class ConditionsToCollectionApplier
{
    private $conditionsToSearchCriteriaMapper;

    private $searchCriteriaProcessor;

    private $mappableConditionsProcessor;

    public function __construct(
        ConditionsToSearchCriteriaMapper $conditionsToSearchCriteriaMapper,
        AdvancedFilterProcessor $searchCriteriaProcessor,
        MappableConditionsProcessor $mappableConditionsProcessor
    ) {
        $this->conditionsToSearchCriteriaMapper = $conditionsToSearchCriteriaMapper;
        $this->searchCriteriaProcessor = $searchCriteriaProcessor;
        $this->mappableConditionsProcessor = $mappableConditionsProcessor;
    }

    public function applyConditionsToCollection(
        Combine $conditions,
        ProductCollection $productCollection
    ): ProductCollection {
        // rebuild conditions to have only those that we know how to map them to product collection
        $mappableConditions = $this->mappableConditionsProcessor->rebuildConditionsTree($conditions);

        // transform conditions to search criteria
        $searchCriteria = $this->conditionsToSearchCriteriaMapper->mapConditionsToSearchCriteria($mappableConditions);

        $mappedProductCollection = clone $productCollection;

        // apply search criteria to new version of product collection
        $this->searchCriteriaProcessor->process($searchCriteria, $mappedProductCollection);

        return $mappedProductCollection;
    }
}