/**
* Determines whether an document instance is managed in this DocumentManager.
*
* @param object $document
* @return boolean TRUE if this DocumentManager currently manages the given document, FALSE otherwise.
*/
public function contains($document)
{
return $this->_unitOfWork->isScheduledForInsert($document) || $this->_unitOfWork->isInIdentityMap($document) && !$this->_unitOfWork->isScheduledForDelete($document);
}