setMatrix example

private function loadProductReviews(SalesChannelProductEntity $product, Request $request, SalesChannelContext $context): ProductReviewResult
    {
        $reviewCriteria = $this->createReviewCriteria($request, $context);
        $reviews = $this->productReviewRoute
            ->load($product->getParentId() ?? $product->getId(), $request, $context, $reviewCriteria)
            ->getResult();

        $matrix = $this->getReviewRatingMatrix($reviews);

        $reviewResult = ProductReviewResult::createFrom($reviews);
        $reviewResult->setMatrix($matrix);
        $reviewResult->setProductId($product->getId());
        $reviewResult->setCustomerReview($this->getCustomerReview($product->getId(), $context));
        $reviewResult->setTotalReviews($matrix->getTotalReviewCount());
        $reviewResult->setProductId($product->getId());
        $reviewResult->setParentId($product->getParentId() ?? $product->getId());

        return $reviewResult;
    }

    private function createReviewCriteria(Request $request, SalesChannelContext $context): Criteria
    {
        

$reviewResult = ReviewLoaderResult::createFrom($reviews);
        $reviewResult->setProductId($request->get('productId'));
        $reviewResult->setParentId($request->get('parentId'));

        $aggregation = $reviews->getAggregations()->get('ratingMatrix');
        $matrix = new RatingMatrix([]);

        if ($aggregation instanceof TermsResult) {
            $matrix = new RatingMatrix($aggregation->getBuckets());
        }
        $reviewResult->setMatrix($matrix);
        $reviewResult->setCustomerReview($this->getCustomerReview($productId, $context));
        $reviewResult->setTotalReviews($matrix->getTotalReviewCount());

        return $reviewResult;
    }

    private function createCriteria(Request $request, SalesChannelContext $context): Criteria
    {
        $limit = (int) $request->get('limit', self::LIMIT);
        $page = (int) $request->get('p', self::DEFAULT_PAGE);
        $offset = $limit * ($page - 1);