/**
* Roll back the transaction associated with the current session.
*
* TODO: Make sure AccessDeniedException is thrown by the transport
* if corresponding problems occur
* TODO: restore the in-memory state as it would be if save() was never
* called during the transaction. The save() method will need to track some
* undo information for this to be possible.
*
* @throws AccessDeniedException if the session is not allowed to
* roll back the transaction.
* @throws RepositoryException if the transaction implementation
* encounters an unexpected error condition.
*/
public function rollbackTransaction()
{
$this->transport->rollbackTransaction();
$this->notifyItems('rollbackTransaction');
}