Category::getUsedDocumentFields

private function getUsedDocumentFields(int $entityTypeId): array
{
	$documentFields = [];

	if (!empty($this->usedDocumentFields))
	{
		$allFields = $this->getTunnelDocumentFields($entityTypeId);

		foreach ($this->usedDocumentFields as $field)
		{
			if (!empty($allFields[$field]))
			{
				$documentFields[] = $allFields[$field];
			}
		}
	}

	return $documentFields;
}