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Decoder.java
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Decoder.java
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package aero.t2s.modes.decoder;
import aero.t2s.modes.Track;
import aero.t2s.modes.database.ModeSDatabase;
import aero.t2s.modes.decoder.df.*;
import java.util.Map;
public class Decoder {
private final double originLat;
private final double originLon;
private final ModeSDatabase modeSDatabase;
private final Map<String, Track> tracks;
public Decoder(Map<String, Track> tracks, double originLat, double originLon, ModeSDatabase database) {
this.tracks = tracks;
this.originLat = originLat;
this.originLon = originLon;
this.modeSDatabase = database == null ? ModeSDatabase.createDatabase() : database;
}
public DownlinkFormat decode(short[] data) throws UnknownDownlinkFormatException {
if (Common.isNotValid(data)) {
return null;
}
int downlinkFormat = data[0] >>> 3;
// Remaining bits are used by the data object
if (downlinkFormat >= 24) {
downlinkFormat = 24;
}
DownlinkFormat df;
switch (downlinkFormat) {
case 0:
df = new DF0(data);
break;
case 4:
df = new DF4(data);
break;
case 5:
df = new DF5(data);
break;
case 11:
df = new DF11(data);
break;
case 16:
df = new DF16(data);
break;
case 17:
df = new DF17(data);
break;
case 18:
df = new DF18(data);
break;
case 20:
df = new DF20(data);
break;
case 21:
df = new DF21(data);
break;
case 22:
df = new DF22(data);
break;
case 24:
df = new DF24(data);
break;
default:
throw new UnknownDownlinkFormatException(downlinkFormat, data);
}
return df.decode().aircraft(modeSDatabase.find(df.getIcao()));
}
public Track getTrack(String icao) {
Track track = tracks.get(icao);
if (track == null) {
track = new Track(icao);
tracks.putIfAbsent(icao, track);
ModeSDatabase.ModeSAircraft modeSAircraft = modeSDatabase.find(icao);
if (modeSAircraft != null) {
track.setWtc(modeSAircraft.wtc);
track.setAtype(modeSAircraft.atyp);
track.setOperator(modeSAircraft.operator);
track.setRegistration(modeSAircraft.registration);
}
} else {
track.setWasJustCreated(false);
}
return track;
}
}