private function createContainers()
 {
     $ringDir = ONPHP_TEMP_PATH . 'tests/main/data/ring';
     $converter = ObjectToDirectoryBinder::create(Singleton::getInstance('EntityProtoDirectoryItem'))->setDirectory($ringDir);
     $itemsConverter = $converter->cloneInnerBuilder('items');
     $ringListHead = DirectoryItem::create()->setId('421');
     $result = $itemsConverter->makeList(array($ringListHead));
     $ringListHead->setInner($items[2] = DirectoryItem::create()->setId('422')->setInner($items[1] = DirectoryItem::create()->setId('423')->setInner($items[0] = DirectoryItem::create()->setId('424')->setInner($ringListHead))));
     // storing head again to update inner link
     $items[3] = $ringListHead;
     $result = $itemsConverter->makeList($items);
     $mainContainer = DirectoryItem::create()->setTextField('main container');
     $mainContainer->setInner($ringListHead);
     // storing the container with its link to ring list head
     $result = $converter->make($mainContainer);
 }
 /**
  * @return PrototypedBuilder
  **/
 public function makeReverseBuilder()
 {
     return ObjectToDirectoryBinder::create($this->proto)->setIdentityMap($this->identityMap);
 }