Doctrine\ODM\MongoDB\Mapping\ClassMetadataInfo::setIdGenerator PHP Method

    public function setIdGenerator($generator)
    {
        $this->idGenerator = $generator;
    }

 private function completeIdGeneratorMapping(ClassMetadataInfo $class)
 {
     $idGenOptions = $class->generatorOptions;
     switch ($class->generatorType) {
         case ClassMetadata::GENERATOR_TYPE_AUTO:
             $class->setIdGenerator(new \Doctrine\ODM\MongoDB\Id\AutoGenerator($class));
             break;
         case ClassMetadata::GENERATOR_TYPE_INCREMENT:
             $incrementGenerator = new \Doctrine\ODM\MongoDB\Id\IncrementGenerator($class);
             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:
             $uuidGenerator = new \Doctrine\ODM\MongoDB\Id\UuidGenerator($class);
             $uuidGenerator->setSalt(isset($idGenOptions['salt']) ? $idGenOptions['salt'] : php_uname('n'));
             $class->setIdGenerator($uuidGenerator);
             break;
         case ClassMetadata::GENERATOR_TYPE_ALNUM:
             $alnumGenerator = new \Doctrine\ODM\MongoDB\Id\AlnumGenerator($class);
             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_NONE:
             break;
         default:
             throw new MappingException("Unknown generator type: " . $class->generatorType);
     }
 }