Driver::getInstance PHP Method

    public static function getInstance()
    {
        if (self::$_instance === null) {
            self::$_instance = new self();
        }
        return self::$_instance;
    }

 protected function calculateCrumb(BaseObject $object)
 {
     $parentId = $object->getParentId();
     if (!$parentId) {
         $this->crumbsByObjectId[$object->getId()] = array($object->getName());
         return $this->crumbsByObjectId[$object->getId()];
     }
     if (isset($this->crumbsByObjectId[$parentId])) {
         $this->crumbsByObjectId[$object->getId()] = $this->crumbsByObjectId[$parentId];
         $this->crumbsByObjectId[$object->getId()][] = $object->getName();
         return $this->crumbsByObjectId[$object->getId()];
     }
     $storage = $object->getStorage();
     $fake = Driver::getInstance()->getFakeSecurityContext();
     $this->crumbsByObjectId[$object->getId()] = array();
     foreach ($object->getParents($fake, array('select' => array('ID', 'NAME', 'TYPE')), SORT_DESC) as $parent) {
         if ($parent->getId() == $storage->getRootObjectId()) {
             continue;
         }
         $this->crumbsByObjectId[$object->getId()][] = $parent->getName();
     }
     unset($parent);
     $this->crumbsByObjectId[$parentId] = $this->crumbsByObjectId[$object->getId()];
     $this->crumbsByObjectId[$object->getId()][] = $object->getName();
     return $this->crumbsByObjectId[$object->getId()];
 }