Doctrine\OXM\UnitOfWork::addToIdentityMap PHP Метод

    public function addToIdentityMap($xmlEntity)
    {
        $classMetadata = $this->xem->getClassMetadata(get_class($xmlEntity));
        $id = $this->entityIdentifiers[spl_object_hash($xmlEntity)];
        if ($id === '') {
            throw new \InvalidArgumentException("The given xml entity has no identity.");
        }
        $className = $classMetadata->rootXmlEntityName;
        if (isset($this->identityMap[$className][$id])) {
            return false;
        }
        $this->identityMap[$className][$id] = $xmlEntity;
        if ($xmlEntity instanceof NotifyPropertyChanged) {
            $xmlEntity->addPropertyChangedListener($this);
        }
        return true;
    }