protected function getContentTypesHash()
    {
        $contentTypeHash = [];
        foreach ($this->contentTypeService->loadContentTypeGroups() as $contentTypeGroup) {
            foreach ($this->contentTypeService->loadContentTypes($contentTypeGroup) as $contentType) {
                $contentTypeHash[$contentType->getName()] = $contentType->identifier;
            }
        }
        ksort($contentTypeHash);

        return $contentTypeHash;
    }