/**
* {@inheritdoc}
*/
public function getGoogleBooksVolumeLink()
{
$isbn = $this->recordDriver->getISBNs()[0];
$lccn = $this->recordDriver->getLCCN();
$oclc = $this->recordDriver->getCleanOCLCNum();
if (!$isbn && !$lccn && !$oclc) {
return false;
}
$url = 'https://www.googleapis.com/books/v1/volumes';
if ($isbn) {
$params = array('q' => 'isbn:' . str_replace("-", "", $isbn));
}
if ($lccn) {
$params = array('q' => 'lccn:' . str_replace("-", "", $lccn));
}
if ($oclc) {
$params = array('q' => 'oclc:' . str_replace("-", "", $oclc));
}
$dataArray = $this->getRequestDataResponseAsArray($url, $params);
$link = $dataArray['items'][0]['volumeInfo']['canonicalVolumeLink'];
if (!isset($link) || empty($link)) {
return null;
}
return $link;
}
