/**
* Appends the record's header to the XML response.
*
* Adds the identifier, datestamp and setSpec to a header element, and
* appends in to the document.
*
* @param DOMElement $parentElement
*/
public function appendHeader($parentElement)
{
$headerData['identifier'] = OaiPmhRepository_OaiIdentifier::itemToOaiId($this->item->id);
$headerData['datestamp'] = OaiPmhRepository_Date::dbToUtc($this->item->modified);
$collectionId = $this->item->collection_id;
if ($collectionId) {
$headerData['setSpec'] = $collectionId;
}
$this->createElementWithChildren($parentElement, 'header', $headerData);
}
/**
* Deletes the rows for expired tokens from the table.
*/
public function purgeExpiredTokens()
{
$db = $this->getDb();
$db->delete($this->getTableName(), 'expiration <= ' . $db->quote(OaiPmhRepository_Date::unixToDb(time())));
}
/**
* Stores a new resumption token record in the database
*
* @param string $verb OAI-PMH verb for the request
* @param string $metadataPrefix Metadata prefix
* @param int $cursor Offset in response to begin output at
* @param mixed $set Optional set argument
* @param string $from Optional from date argument
* @param string $until Optional until date argument
* @return OaiPmhRepositoryToken Token model object
*/
private function createResumptionToken($verb, $metadataPrefix, $cursor, $set, $from, $until)
{
$tokenTable = get_db()->getTable('OaiPmhRepositoryToken');
$resumptionToken = new OaiPmhRepositoryToken();
$resumptionToken->verb = $verb;
$resumptionToken->metadata_prefix = $metadataPrefix;
$resumptionToken->cursor = $cursor;
if ($set) {
$resumptionToken->set = $set;
}
if ($from) {
$resumptionToken->from = $from;
}
if ($until) {
$resumptionToken->until = $until;
}
$resumptionToken->expiration = OaiPmhRepository_Date::unixToDb(time() + $this->_tokenExpirationTime * 60);
$resumptionToken->save();
return $resumptionToken;
}
/**
* Helper to get the earlieast datestamp of the repository.
*
* @return string OAI-PMH date stamp.
*/
private function _getEarliestDatestamp()
{
$earliestItem = get_record('Item', array('public' => 1, 'sort_field' => 'added', 'sort_dir' => 'a'));
return $earliestItem ? OaiPmhRepository_Date::dbToUtc($earliestItem->added) : OaiPmhRepository_Date::unixToUtc(0);
}
