BaseHandler::getFilterParameters

protected function getFilterParameters(): array
{
	static $filterParameters = [];

	$filter = $this->getFilter();
	$filterId = $filter->getFilterParameters()['FILTER_ID'];

	if (!$filterParameters[$filterId])
	{
		$options = new Options($filterId, $filter::getPresetsList());
		$fieldList = $filter::getFieldsList();
		$filterParameters[$filterId] = $options->getFilter($fieldList);
	}

	return $filterParameters[$filterId];
}