|  |  | 
 |  |  | use transit_realtime\FeedMessage; | 
 |  |  |  | 
 |  |  | class Mapper { | 
 |  |  |    private $ttssDate = NULL; | 
 |  |  |    private $ttssTrips = []; | 
 |  |  |    private $gtfsrtDate = NULL; | 
 |  |  |    private $gtfsrtTrips = []; | 
 |  |  |    private $logger = NULL; | 
 |  |  |     | 
 |  |  | 
 |  |  |     | 
 |  |  |    public function loadTTSS($file) { | 
 |  |  |       $ttss = json_decode(file_get_contents($file)); | 
 |  |  |       $this->ttssDate = $ttss->lastUpdate; | 
 |  |  |       foreach($ttss->vehicles as $vehicle) { | 
 |  |  |          if(isset($vehicle->isDeleted) && $vehicle->isDeleted) continue; | 
 |  |  |          if(!isset($vehicle->tripId) || !$vehicle->tripId) continue; | 
 |  |  | 
 |  |  |       ksort($this->ttssTrips); | 
 |  |  |    } | 
 |  |  |     | 
 |  |  |    public function getTTSSDate() { | 
 |  |  |       return $this->ttssDate / 1000.0; | 
 |  |  |    } | 
 |  |  | 	 | 
 |  |  |    public function loadGTFSRT($file) { | 
 |  |  |       $data = file_get_contents($file); | 
 |  |  |       $feed = new FeedMessage(); | 
 |  |  |       $feed->parse($data); | 
 |  |  |       $this->gtfsrtDate = $feed->header->timestamp; | 
 |  |  |       foreach ($feed->getEntityList() as $entity) { | 
 |  |  |          $vehiclePosition = $entity->getVehicle(); | 
 |  |  |          $position = $vehiclePosition->getPosition(); | 
 |  |  | 
 |  |  |       ksort($this->gtfsrtTrips); | 
 |  |  |    } | 
 |  |  |     | 
 |  |  |    public function getGTFSRTDate() { | 
 |  |  |       return $this->gtfsrtDate; | 
 |  |  |    } | 
 |  |  | 	 | 
 |  |  |    public function findOffset() { | 
 |  |  |       if(count($this->ttssTrips) == 0 || count($this->gtfsrtTrips) == 0) { | 
 |  |  |          return NULL; |