code: protected function getMappingDriverBundleConfigDefaults(array $bundleConfig, \ReflectionClass $bundle, ContainerBuilder $container)
      {
          $bundleDir = dirname($bundle->getFilename());
  
          if (!$bundleConfig['type']) {
              $bundleConfig['type'] = $this->detectMetadataDriver($bundleDir, $container);
          }
  
          if (!$bundleConfig['type']) {
              // skip this bundle, no mapping information was found.
              return false;
          }
  
          if (!$bundleConfig['dir']) {
              if (in_array($bundleConfig['type'], array('annotation', 'staticphp'))) {
                  $bundleConfig['dir'] = $bundleDir.'/'.$this->getMappingObjectDefaultName();
              } else {
                  $bundleConfig['dir'] = $bundleDir.'/'.$this->getMappingResourceConfigDirectory();
              }
          } else {
              $bundleConfig['dir'] = $bundleDir.'/'.$bundleConfig['dir'];
          }
  
          if (!$bundleConfig['prefix']) {
              $bundleConfig['prefix'] = $bundle->getNamespaceName().'\\'.$this->getMappingObjectDefaultName();
          }
  
          return $bundleConfig;
      }
docs: If this is a bundle controlled mapping all the missing information can be autodetected by this method.
  
  Returns false when autodetection failed, an array of the completed information otherwise.
  
  @param array            $bundleConfig
  @param \ReflectionClass $bundle
  @param ContainerBuilder $container    A ContainerBuilder instance
  
  @return array|false