/// <summary>
/// Writes a geojson file from the given database into the open stream
/// Selects items to write from the given selection criteria
/// </summary>
/// <param name="db">The navDatabase to dump</param>
/// <param name="geojOutStream">The open outstream</param>
/// <param name="rangeLimitNm">Range Limit in nm</param>
/// <param name="Lat">Center Lat (decimal)</param>
/// <param name="Lon">Center Lon (decimal)</param>
/// <param name="navTypes">Type of nav items to include</param>
/// <returns>True ??!!</returns>
public static bool WriteGeoJson(navDatabase db, Stream geojOutStream,
double rangeLimitNm = -1.0, double Lat = 0, double Lon = 0, NavTypes[] navTypes = null)
{
/*
* {
* "type": "FeatureCollection",
* "crs": { "type": "name", "properties": { "name": "urn:ogc:def:crs:OGC:1.3:CRS84" } },
* "features": [
* entry, entry
* ]
* }
*/
string head = $"{{\n\"type\": \"FeatureCollection\",\n" +
$"\"crs\": {{ \"type\": \"name\", \"properties\": {{ \"name\": \"urn:ogc:def:crs:OGC:1.3:CRS84\" }} }}," +
$"\"features\": [";
string foot = $"]\n}}";
using (var sw = new StreamWriter(geojOutStream, Encoding.UTF8)) {
sw.WriteLine(head);
if (rangeLimitNm > 0)
{
WriteFile(sw, db.GetSubtable(rangeLimitNm, Lat, Lon, navTypes));
}
else
{
WriteFile(sw, db.GetSubtable( ));
}
sw.WriteLine(foot);
}
return(true);
}
/// <summary>
/// Reads all data from the given file
/// </summary>
/// <param name="db">The navDatabase to fill from the file</param>
/// <param name="csvFile">The file to read</param>
/// <returns>The result string, either empty or error</returns>
public static string ReadDb(ref navDatabase db, string csvFile)
{
if (!File.Exists(csvFile))
{
return($"File does not exist\n");
}
return(ReadDbFile(ref db, csvFile));
}
/// <summary>
/// Reads one db file
/// </summary>
/// <param name="db">The navDatabase to fill from the file</param>
/// <param name="fName">The qualified filename</param>
/// <returns>The result string, either empty or error</returns>
private static string ReadDbFile(ref navDatabase db, string fName)
{
var icaoPre = Path.GetFileNameWithoutExtension(fName);
string ret = "";
using (var sr = new StreamReader(fName)) {
string buffer = sr.ReadLine( ); // header line
buffer = sr.ReadLine( );
while (!sr.EndOfStream)
{
var rec = FromNative(buffer);
if (rec.IsValid)
{
ret += db.Add(rec); // collect adding information
}
buffer = sr.ReadLine( );
}
//
}
return(ret);
}