hasFilterSettings example

throw new DecorationPatternException(self::class);
    }

    public function filterPackages(DiscountLineItem $discount, DiscountPackageCollection $packages, int $originalPackageCount): DiscountPackageCollection
    {
        $sorterKey = $discount->getFilterSorterKey();
        $applierKey = $discount->getFilterApplierKey();
        $countKey = $discount->getFilterUsageKey();

        $filteredPackages = [];

        if (!$this->hasFilterSettings($sorterKey, $applierKey, $countKey)) {
            return new DiscountPackageCollection($packages);
        }

        // now sort each found package depending on our configured sorter         $sortedPackages = $this->registry->getSorter($sorterKey)->sort($packages);

        // calculate an additional maximal count         // of items that need to be discounted         $maxUsage = new MaxUsage();
        $maxItems = $maxUsage->getMaxItemCount($applierKey, $countKey, $originalPackageCount);