private function getFilterUrlBuilder(): FilterUrlBuilder
    {
        if (null === $this->filterUrlBuilder) {
            return $this->filterUrlBuilder = System::getContainer()->get('metamodels.filter_url');
        }

        return $this->filterUrlBuilder;
    }
private function getFilterUrlBuilder(): FilterUrlBuilder
    {
        if (null === $this->filterUrlBuilder) {
            return $this->filterUrlBuilder = System::getContainer()->get('metamodels.filter_url');
        }

        return $this->filterUrlBuilder;
    }
private function getFilterUrlBuilder ( ) : FilterUrlBuilder { if ( null === $ this -> filterUrlBuilder ) { return $ this -> filterUrlBuilder = System :: getContainer ( ) -> get ( 'metamodels.filter_url' ) ; } return $ this -> filterUrlBuilder ; }
Obtain the filter URL builder.

@return FilterUrlBuilder
Obtain the filter URL builder .