Doctrine\ODM\MongoDB\Mapping\ClassMetadataFactory::completeIdGeneratorMapping PHP Method

    private function completeIdGeneratorMapping(ClassMetadataInfo $class)
    {
        $idGenOptions = $class->generatorOptions;
        switch ($class->generatorType) {
            case ClassMetadata::GENERATOR_TYPE_AUTO:
                $class->setIdGenerator(new AutoGenerator());
                break;
            case ClassMetadata::GENERATOR_TYPE_INCREMENT:
                $incrementGenerator = new IncrementGenerator();
                if (isset($idGenOptions['key'])) {
                    $incrementGenerator->setKey($idGenOptions['key']);
                }
                if (isset($idGenOptions['collection'])) {
                    $incrementGenerator->setCollection($idGenOptions['collection']);
                }
                $class->setIdGenerator($incrementGenerator);
                break;
            case ClassMetadata::GENERATOR_TYPE_UUID:
                $uuidGenerator = new UuidGenerator();
                isset($idGenOptions['salt']) && $uuidGenerator->setSalt($idGenOptions['salt']);
                $class->setIdGenerator($uuidGenerator);
                break;
            case ClassMetadata::GENERATOR_TYPE_ALNUM:
                $alnumGenerator = new AlnumGenerator();
                if (isset($idGenOptions['pad'])) {
                    $alnumGenerator->setPad($idGenOptions['pad']);
                }
                if (isset($idGenOptions['chars'])) {
                    $alnumGenerator->setChars($idGenOptions['chars']);
                } elseif (isset($idGenOptions['awkwardSafe'])) {
                    $alnumGenerator->setAwkwardSafeMode($idGenOptions['awkwardSafe']);
                }
                $class->setIdGenerator($alnumGenerator);
                break;
            case ClassMetadata::GENERATOR_TYPE_CUSTOM:
                if (empty($idGenOptions['class'])) {
                    throw MappingException::missingIdGeneratorClass($class->name);
                }
                $customGenerator = new $idGenOptions['class']();
                unset($idGenOptions['class']);
                if (!$customGenerator instanceof AbstractIdGenerator) {
                    throw MappingException::classIsNotAValidGenerator(get_class($customGenerator));
                }
                $methods = get_class_methods($customGenerator);
                foreach ($idGenOptions as $name => $value) {
                    $method = 'set' . ucfirst($name);
                    if (!in_array($method, $methods)) {
                        throw MappingException::missingGeneratorSetter(get_class($customGenerator), $name);
                    }
                    $customGenerator->{$method}($value);
                }
                $class->setIdGenerator($customGenerator);
                break;
            case ClassMetadata::GENERATOR_TYPE_NONE:
                break;
            default:
                throw new MappingException('Unknown generator type: ' . $class->generatorType);
        }
    }