Doctrine\OXM\Id\AssignedGenerator::generate PHP Метод

    public function generate(XmlEntityManager $xem, $xmlEntity)
    {
        $class = $xem->getClassMetadata(get_class($xmlEntity));
        $idField = $class->identifier;
        $value = $class->reflFields[$idField]->getValue($xmlEntity);
        if (isset($value)) {
            if (is_object($value)) {
                // NOTE: Single Columns as associated identifiers only allowed - this constraint it is enforced.
                $identifier = current($xem->getUnitOfWork()->getEntityIdentifier($value));
            } else {
                $identifier = $value;
            }
        } else {
            throw OXMException::entityMissingAssignedId($xmlEntity);
        }
        return $identifier;
    }