handleProductAttributeFacet example

$customFacets = $this->facetService->getAllCategoryFacets($context);
        }

        foreach ($customFacets as $customFacet) {
            if (!$customFacet->getFacet()) {
                continue;
            }
            $facet = $customFacet->getFacet();
            $criteria->addFacet($facet);

            if ($facet instanceof ProductAttributeFacet) {
                $this->handleProductAttributeFacet($request, $criteria, $facet);
            } elseif ($facet instanceof CombinedConditionFacet) {
                $this->handleCombinedConditionFacet($request, $criteria, $facet);
            }
        }
    }

    /** * @return bool */
    private function isCategoryListing(Request $request)
    {