private function completeIdGeneratorMapping(ClassMetadataInfo $class)
    {
        $idGenType = $class->generatorType;
        if ($idGenType == ClassMetadata::GENERATOR_TYPE_AUTO) {
            $class->setIdGeneratorType(ClassMetadataInfo::GENERATOR_TYPE_NONE);
        }

        // Create & assign an appropriate ID generator instance
        switch ($class->generatorType) {
            case ClassMetadataInfo::GENERATOR_TYPE_INCREMENT:
                throw new OXMException("Increment generator type not implemented yet");
                break;
            case ClassMetadataInfo::GENERATOR_TYPE_NONE:
                $class->setIdGenerator(new \Doctrine\OXM\Id\AssignedGenerator());
                break;
            case ClassMetadataInfo::GENERATOR_TYPE_UUID:
                $class->setIdGenerator(new \Doctrine\OXM\Id\UuidGenerator());
                break;
            default:
                throw new OXMException("Unknown generator type: " . $class->generatorType);
        }
    }