code: public function getSystemId()
      {
          if (!isset($this->_systemId)) {
              if (isset($this->collectorItem) && isset($this->collectorItem->systemId)) {
                  $this->_systemId = $this->collectorItem->systemId;
              }
          }
  
          return $this->_systemId;
      }
docs: Get system.
  
  @return unknown