Doctrine\ODM\MongoDB\UnitOfWork::getOrCreateDocument PHP Method

    public function getOrCreateDocument($className, $data, &$hints = array(), $document = null)
    {
        $class = $this->dm->getClassMetadata($className);
        // @TODO figure out how to remove this
        $discriminatorValue = null;
        if (isset($class->discriminatorField, $data[$class->discriminatorField])) {
            $discriminatorValue = $data[$class->discriminatorField];
        } elseif (isset($class->defaultDiscriminatorValue)) {
            $discriminatorValue = $class->defaultDiscriminatorValue;
        }
        if ($discriminatorValue !== null) {
            $className = isset($class->discriminatorMap[$discriminatorValue]) ? $class->discriminatorMap[$discriminatorValue] : $discriminatorValue;
            $class = $this->dm->getClassMetadata($className);
            unset($data[$class->discriminatorField]);
        }
        if (!empty($hints[Query::HINT_READ_ONLY])) {
            $document = $class->newInstance();
            $this->hydratorFactory->hydrate($document, $data, $hints);
            return $document;
        }
        $isManagedObject = false;
        if (!$class->isQueryResultDocument) {
            $id = $class->getDatabaseIdentifierValue($data['_id']);
            $serializedId = serialize($id);
            $isManagedObject = isset($this->identityMap[$class->name][$serializedId]);
        }
        if ($isManagedObject) {
            $document = $this->identityMap[$class->name][$serializedId];
            $oid = spl_object_hash($document);
            if ($document instanceof Proxy && !$document->__isInitialized__) {
                $document->__isInitialized__ = true;
                $overrideLocalValues = true;
                if ($document instanceof NotifyPropertyChanged) {
                    $document->addPropertyChangedListener($this);
                }
            } else {
                $overrideLocalValues = !empty($hints[Query::HINT_REFRESH]);
            }
            if ($overrideLocalValues) {
                $data = $this->hydratorFactory->hydrate($document, $data, $hints);
                $this->originalDocumentData[$oid] = $data;
            }
        } else {
            if ($document === null) {
                $document = $class->newInstance();
            }
            if (!$class->isQueryResultDocument) {
                $this->registerManaged($document, $id, $data);
                $oid = spl_object_hash($document);
                $this->documentStates[$oid] = self::STATE_MANAGED;
                $this->identityMap[$class->name][$serializedId] = $document;
            }
            $data = $this->hydratorFactory->hydrate($document, $data, $hints);
            if (!$class->isQueryResultDocument) {
                $this->originalDocumentData[$oid] = $data;
            }
        }
        return $document;
    }

 /**
  * @see \Doctrine\MongoDB\EagerCursor::current()
  * @see http://php.net/manual/en/iterator.current.php
  */
 public function current()
 {
     $current = parent::current();
     if ($current === null || !$this->hydrate) {
         return $current;
     }
     return $this->unitOfWork->getOrCreateDocument($this->class->name, $current, $this->unitOfWorkHints);
 }