/**
* Return the latest bitstream from the given item revision.
*
* @param ItemRevisionDao $itemRevisionDao item revision DAO
* @return BitstreamDao
* @throws Zend_Exception
*/
public function getLatestBitstream($itemRevisionDao)
{
$bitstreamDaos = $itemRevisionDao->getBitstreams();
if (count($bitstreamDaos) === 0) {
throw new Zend_Exception('Item revision does not contain any bitstreams');
}
return $bitstreamDaos[0];
}
/** Delete a revision. Calling this will delete:
* -The revision itself
* -All bitstreams of the revision
* -The feed for the creation of the revision
* -The metadata associated with the revision.
*
* @param ItemRevisionDao $revisiondao
* @throws Zend_Exception
*/
public function delete($revisiondao)
{
if (!$revisiondao instanceof ItemRevisionDao) {
throw new Zend_Exception('Error in param revisiondao when deleting an ItemRevision.');
}
$bitstreams = $revisiondao->getBitstreams();
/** @var BitstreamModel $bitstream_model */
$bitstream_model = MidasLoader::loadModel('Bitstream');
foreach ($bitstreams as $bitstream) {
$bitstream_model->delete($bitstream);
}
// explicitly typecast the id to a string, for postgres
$deleteType = array(MIDAS_FEED_CREATE_REVISION);
$sql = $this->database->select()->setIntegrityCheck(false)->from(array('p' => 'feed'))->where('resource = ?', (string) $revisiondao->getKey());
$rowset = $this->database->fetchAll($sql);
/** @var FeedModel $feed_model */
$feed_model = MidasLoader::loadModel('Feed');
foreach ($rowset as $row) {
$feed = $this->initDao('Feed', $row);
if (in_array($feed->getType(), $deleteType)) {
$feed_model->delete($feed);
}
}
// Delete metadata values for this revision
$this->deleteMetadata($revisiondao);
parent::delete($revisiondao);
$revisiondao->saved = false;
unset($revisiondao->itemrevision_id);
}
