/**
  * @param Report $report
  * @param string $treeType
  * @param null $uniqueId
  */
 public function __construct(Report $report, $treeType, $uniqueId = null)
 {
     assert('is_string($uniqueId) || $uniqueId === null');
     parent::__construct($report, $treeType);
     $this->uniqueId = $uniqueId;
 }