private XElement SpeedElement(XElement coord, GPXPathRoot root)
{
XElement xSpeed = coord.Descendants(root.xnamespace + "speed").FirstOrDefault();
if (xSpeed != null)
{
return(xSpeed);
}
XElement xSpeedAlternative = coord.Descendants(root.xnamespace + "extensions").FirstOrDefault();
if (xSpeedAlternative == null)
{
return(null);
}
return(xSpeedAlternative.Descendants(BadElfExtensionNamespace + "speed").FirstOrDefault());
}
/// <summary>
/// Parses GPX-based flight data
/// </summary>
/// <param name="szData">The string of flight data</param>
/// <returns>True for success</returns>
public override bool Parse(string szData)
{
if (String.IsNullOrEmpty(szData))
{
return(false);
}
StringBuilder sbErr = new StringBuilder();
ParsedData.Clear();
Boolean fResult = true;
byte[] bytes = Encoding.UTF8.GetBytes(szData);
MemoryStream stream = null;
try
{
stream = new MemoryStream(bytes);
using (StreamReader sr = new StreamReader(stream))
{
stream = null;
XDocument xml = XDocument.Load(sr);
GPXPathRoot root = FindRoot(xml);
if (root == null)
{
return(false);
}
if (root.elements != null)
{
int iRow = 0;
bool fHasAlt = false;
bool fHasDate = false;
bool fHasLatLon = false;
bool fHasSpeed = false;
List <Position> lst = new List <Position>();
foreach (XElement e in root.elements)
{
foreach (XElement coord in e.Descendants(root.xnamespace + "trkpt"))
{
XAttribute xLat = null;
XAttribute xLon = null;
XElement xAlt = null;
XElement xTime = null;
XElement xSpeed = null;
XElement xBadElfSpeed = null;
xLat = coord.Attribute("lat");
xLon = coord.Attribute("lon");
xAlt = coord.Descendants(root.xnamespace + "ele").FirstOrDefault();
xTime = coord.Descendants(root.xnamespace + "time").FirstOrDefault();
xSpeed = SpeedElement(coord, root);
fHasAlt = (xAlt != null);
fHasDate = (xTime != null);
fHasSpeed = (xSpeed != null || xBadElfSpeed != null);
fHasLatLon = (xLat != null && xLon != null);
if (!fHasAlt && !fHasDate && !fHasSpeed && !fHasLatLon)
{
throw new MyFlightbookException(Resources.FlightData.errGPXNoPath);
}
if (fHasLatLon)
{
try
{
Position samp = new Position(Convert.ToDouble(xLat.Value, System.Globalization.CultureInfo.InvariantCulture), Convert.ToDouble(xLon.Value, System.Globalization.CultureInfo.InvariantCulture));
if (fHasAlt)
{
samp.Altitude = (Int32)Convert.ToDouble(xAlt.Value, System.Globalization.CultureInfo.InvariantCulture);
}
if (fHasDate)
{
samp.Timestamp = xTime.Value.ParseUTCDate();
}
if (fHasSpeed)
{
samp.Speed = Convert.ToDouble(xSpeed.Value, System.Globalization.CultureInfo.InvariantCulture);
}
lst.Add(samp);
}
catch (Exception ex) when(ex is FormatException)
{
fResult = false;
sbErr.AppendFormat(CultureInfo.CurrentCulture, Resources.FlightData.errGPXBadRow, iRow);
sbErr.Append("\r\n");
}
catch (Exception ex)
{
MyFlightbookException.NotifyAdminException(new MyFlightbookException("Unknown error in ParseFlightDataGPX", ex));
throw;
}
}
iRow++;
}
}
// Derive speed and put it into a data table
if (!fHasSpeed)
{
Position.DeriveSpeed(lst);
}
ToDataTable(lst);
}
else
{
throw new MyFlightbookException(Resources.FlightData.errGPXNoPath);
}
}
}
catch (System.Xml.XmlException ex)
{
sbErr.Append(Resources.FlightData.errGeneric + ex.Message);
fResult = false;
}
catch (MyFlightbookException ex)
{
sbErr.Append(Resources.FlightData.errGeneric + ex.Message);
fResult = false;
}
finally
{
stream?.Dispose();
}
ErrorString = sbErr.ToString();
return(fResult);
}
