/**
* Determines whether a document instance is managed in this DocumentManager.
*
* @param object $document
* @throws \InvalidArgumentException When the $document param is not an object
* @return boolean TRUE if this DocumentManager currently manages the given document, FALSE otherwise.
*/
public function contains($document)
{
if (!is_object($document)) {
throw new \InvalidArgumentException(gettype($document));
}
return $this->unitOfWork->isScheduledForInsert($document) || $this->unitOfWork->isInIdentityMap($document) && !$this->unitOfWork->isScheduledForDelete($document);
}