private function loadChunk()
    {
        $portion = $this->pdGetDataChunk($this->api, $this->options, $this->reverse);

        $this->options = $portion['params'];
        $this->nextPageParams = $portion['nextParams'];
        $this->prevPageParams = $portion['prevParams'];

        if ($portion['data']) {
            $this->container = array_merge($this->container, $portion['data']);
        }

        if (!count($portion['params'])) {
            $this->fullyLoaded = true;
        }
    }