/**
* Do a request to get the next batch of items
*
* @return int The number of items in the batch after the retrieve
*/
private function retrieveBatch()
{
// Set OAI-PMH parameters for request
// If resumptionToken, then we ignore params and just use that
$params = $this->resumptionToken ? ['resumptionToken' => $this->resumptionToken] : $this->params;
// Node name and verb
$nodeName = $this->getItemNodeName();
$verb = $this->verb;
//Do it..
$resp = $this->httpClient->request($verb, $params);
$this->numRequests++;
//Result format error?
if (!isset($resp->{$verb}->{$nodeName})) {
throw new MalformedResponseException(sprintf("Expected XML element list '%s' missing for verb '%s'", $nodeName, $verb));
}
//Process the results
foreach ($resp->{$verb}->{$nodeName} as $node) {
$this->batch[] = $node;
}
//Set the resumption token and expiration date, if specified in the response
if (isset($resp->{$verb}->resumptionToken)) {
$this->resumptionToken = (string) $resp->{$verb}->resumptionToken;
if (isset($resp->{$verb}->resumptionToken['completeListSize'])) {
$this->totalRecordsInCollection = (int) $resp->{$verb}->resumptionToken['completeListSize'];
}
if (isset($resp->{$verb}->resumptionToken['expirationDate'])) {
$t = $resp->{$verb}->resumptionToken['expirationDate'];
$this->expireDate = \DateTime::createFromFormat(\DateTime::ISO8601, $t);
}
} else {
//Unset the resumption token when we're at the end of the list
$this->resumptionToken = null;
}
//Return a count
return count($this->batch);
}
/**
* Get a single record
*
* @param string $id Record Identifier
* @param string $metadataPrefix Required by OAI-PMH endpoint
* @return \SimpleXMLElement An XML document corresponding to the record
*/
public function getRecord($id, $metadataPrefix)
{
$params = array('identifier' => $id, 'metadataPrefix' => $metadataPrefix);
return $this->client->request('GetRecord', $params);
}