public function getContent()
    {
        if (null === $this->templateHelper) {
            throw new \RuntimeException('Rokka TemplateHelper is not set in RokkaHash. Needed for downloading images.');
        }
        if (null === $this->content) {
            $rokkaHash = $this->getRokkaHash();
            if (null !== $rokkaHash) {
                $this->content = $this->templateHelper->getRokkaClient()->getSourceImageContents($rokkaHash);
            }
        }

        return $this->content;
    }