protected function addToData(\ORC\Util\Tree\INode $node, $strict = true)
 {
     if (!isset($this->data[$node->getKey()])) {
         $this->data[$node->getKey()] = $node;
         unset($this->orphan[$node->getKey()]);
     } elseif ($strict) {
         throw new RuntimeException('数据已经存在,不能重复添加');
     }
 }