/**
* Called when AVL data is read from URL. Processes the JSON data and calls processAvlReport() for
* each AVL report.
*/
@Override
protected Collection<AvlReport> processData(InputStream in) throws Exception {
// Get the JSON string containing the AVL data
String jsonStr = getJsonString(in);
try {
// Convert JSON string to a JSON object
JSONObject jsonObj = new JSONObject(jsonStr);
// The JSON feed is really odd. Instead of having an
// array of vehicles there is a separate JSON object
// for each vehicle, and the name of the object is the
// trip ID. Therefore need to get names of all the objects
// so that each one can be accessed by name.
String tripNames[] = JSONObject.getNames(jsonObj);
// The return value for the method
Collection<AvlReport> avlReportsReadIn = new ArrayList<AvlReport>();
// For each vehicle...
for (String tripName : tripNames) {
JSONObject v = jsonObj.getJSONObject(tripName);
// Create the AvlReport from the JSON data
String vehicleId = Integer.toString(v.getInt("vehicle_id"));
Double lat = v.getDouble("vehicle_lat");
Double lon = v.getDouble("vehicle_lon");
// Guessing that the speed is in mph since getting values up to 58.
// Therefore need to convert to m/s.
float speed = (float) v.getDouble("vehicle_speed") * Geo.MPH_TO_MPS;
// Not sure if bearing is the same as heading.
float heading = (float) v.getDouble("vehicle_bearing");
// The time is really strange. It is off by 4-5 hours for some
// strange reason. It appears to be 4 hours off during daylight
// savings time but 5 hours during normal winter hours. Yikes!
// Therefore using the parameter keolisFeedAvlTimeOffset to
// specify the offset.
long gpsTime =
v.getLong("vehicle_timestamp") * Time.MS_PER_SEC
+ keolisFeedAvlTimeOffset.getValue() * Time.HOUR_IN_MSECS;
// Create the AvlReport
AvlReport avlReport = new AvlReport(vehicleId, gpsTime, lat, lon, speed, heading, "Keolis");
// Need to set assignment info separately. Unfortunately the
// trip ID in the Keolis feed doesn't correspond exactly to the
// trip IDs in the GTFS data. In Keolis feed it will be
// something like "CR-FRAMINGHAM-Weekday-515" but in GTFS it will
// be "CR-Worcester-CR-Weekday-Worcester-Jun15-515". Therefore
// it is best to just use the trip short name, such as "515".
String tripShortName = tripName.substring(tripName.lastIndexOf('-') + 1);
// Actually set the assignment
avlReport.setAssignment(tripShortName, AssignmentType.TRIP_SHORT_NAME);
logger.debug("From KeolisAvlModule {}", avlReport);
if (shouldProcessAvl) {
avlReportsReadIn.add(avlReport);
}
}
// Return all the AVL reports read in
return avlReportsReadIn;
} catch (JSONException e) {
logger.error("Error parsing JSON. {}. {}", e.getMessage(), jsonStr, e);
return new ArrayList<AvlReport>();
}
}
/** @param lastAvlReport */
public IpcAvl(AvlReport a) {
this.vehicleId = a.getVehicleId();
this.time = a.getTime();
this.latitude = (float) a.getLat();
this.longitude = (float) a.getLon();
this.speed = a.getSpeed();
this.heading = a.getHeading();
this.source = a.getSource();
this.assignmentId = a.getAssignmentId();
this.assignmentType = a.getAssignmentType();
this.driverId = a.getDriverId();
this.licensePlate = a.getLicensePlate();
this.passengerCount = a.getPassengerCount();
}
