ChillNewExtTrackInfo.java

package edu.colostate.vchill.chill;

import edu.colostate.vchill.ChillDefines;
import edu.colostate.vchill.ViewUtil;
import edu.colostate.vchill.socket.SocketUtil;

import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import java.util.Date;

/**
 * Extended aircraft tracking position update header
 *
 * @author Jochen Deyke
 * @author jpont
 * @version 2008-08-25
 */
public class ChillNewExtTrackInfo extends ChillHeader {
    /**
     * maximum length (in bytes) of trackID
     */
    public static final int trackIDLength = 32;

    /**
     * maximum length (in bytes) of trackInfo
     */
    public static final int trackInfoLength = 32;

    /**
     * size (in bytes) of this header (including ChillHeaderHeader, but not including extraData)
     */
    public static final int BYTE_SIZE = ChillHeaderHeader.BYTE_SIZE +
            ChillDefines.LONG_BYTE_SIZE + 4 * ChillDefines.FLOAT_BYTE_SIZE +
            ChillDefines.INT_BYTE_SIZE +
            trackIDLength + trackInfoLength;

    /**
     * Seconds since UNIX Epoch for this report
     */
    public /*unsigned*/ long time;

    /**
     * Vehicle GPS latitude +ve = N, -ve = S
     */
    public float latitudeD;

    /**
     * Vehicle GPS longitude +ve = E, -ve = W
     */
    public float longitudeD;

    /**
     * Vehicle altitude in meters MSL
     */
    public float altitudeM;

    /**
     * < Vehicle heading in degrees (if available)
     */
    public float headingD;

    /**
     * Name of this vehicle
     */
    public String trackID;

    /**
     * Additional track information
     */
    public String trackInfo;

    /**
     * Unique numeric ID assigned to each track source by the moment server
     */
    public int sourceID;

    /**
     * Vehicle position east of radar (this isn't part of the header)
     */
    public float posX;

    /**
     * Vehicle position north of radar (this isn't part of the header)
     */
    public float posY;

    /**
     * Constructs a header by reading initial values from a DataInput.
     *
     * @param in the DataInput to read initialization values from
     */
    public ChillNewExtTrackInfo(final DataInput in, final ChillHeaderHeader header) throws IOException {
        super(header);
        assert header.recordType == ChillDefines.NEW_EXT_TRACK_DATA;
        assert header.headerLength - ChillNewExtTrackInfo.BYTE_SIZE >= 0;
        this.time = in.readLong();
        this.latitudeD = in.readFloat();
        this.longitudeD = in.readFloat();
        this.altitudeM = in.readFloat();
        this.headingD = in.readFloat();
        this.trackID = SocketUtil.readString(in, trackIDLength);
        this.trackInfo = SocketUtil.readString(in, trackInfoLength);
        this.sourceID = in.readInt();
        in.readFully(this.extraData = new byte[header.headerLength - ChillNewExtTrackInfo.BYTE_SIZE]);

        double[] xy = ViewUtil.getKm(this.longitudeD, this.latitudeD, false);
        this.posX = (float) xy[0];
        this.posY = (float) xy[1];
    }

    /**
     * Writes this header to a DataOut
     *
     * @param out the DataOutput to write values to
     */
    @Override
    public void write(final DataOutput out) throws IOException {
        assert header.headerLength == ChillNewExtTrackInfo.BYTE_SIZE + extraData.length;
        super.header.write(out);
        out.writeLong(this.time);
        out.writeFloat(this.latitudeD);
        out.writeFloat(this.longitudeD);
        out.writeFloat(this.altitudeM);
        out.writeFloat(this.headingD);
        SocketUtil.writeString(this.trackID, out, trackIDLength);
        SocketUtil.writeString(this.trackInfo, out, trackInfoLength);
        out.writeInt(this.sourceID);
        out.write(this.extraData);
    }

    @Override
    public String toString() {
        return "Aircraft " + this.trackID + " was at " +
                this.latitudeD + ", " +
                this.longitudeD + ", " + "(" +
                this.posX + ", " + this.posY + ") " +
                (this.altitudeM * 1e-3) + " at " +
                new Date(this.time * 1000).toString() + " \"" +
                this.trackInfo + "\"";
    }
}