Partial message 27 for aisparser

Message27.java

/**
 * AIS Parser SDK AIS Message 27 - 'K'.
 *
 * <p>Copyright 2019 Google Inc. All Rights Reserved.
 *
 * @author Kurt Schwehr
 */

/** AIS Message 27 class Long-range Position Report */
public class Message27 extends Messages {
    static final int MSG_ID = 27; // 'K'

    int pos_acc; // 1 bit: Position Accuracy
    int raim; // 1 bit: RAIM flag
    int nav_status; // 4 bits: Navigational Status
    Position pos; // 18 + 17 bits: Lat/Long in 1/10 minute
    int sog; // 10 bits: Speed Over Ground in knots
    int cog; // 12 bits: Course over Ground in degrees
    int pos_latency; // 1 bit: 0 - less than 5 sec
    int spare; // 1 bit : Spare

    public int pos_acc() {
        return this.pos_acc;
    }

    public int raim() {
        return this.raim;
    }

    public int nav_status() {
        return this.nav_status;
    }

    public long longitude() {
        return this.pos.longitude();
    }

    public long latitude() {
        return this.pos.latitude();
    }

    public int sog() {
        return this.sog;
    }

    public int cog() {
        return this.cog;
    }

    public int pos_latency() {
        return this.spare;
    }

    public int spare() {
        return this.spare;
    }

    public Message27() {
        super();
    }

    public void parse(Sixbit six_state) throws SixbitsExhaustedException, AISMessageException {
        if (six_state.bit_length() != 96) {
            // Ignore invalid, but common, 168 bit messages.
            throw new AISMessageException("Message 27 wrong length");
        }

        super.parse(MSG_ID, six_state);

        this.pos_acc = (int) six_state.get(1);
        this.raim = (int) six_state.get(1);
        this.nav_status = (int) six_state.get(4);

        this.pos = new Position();
        this.pos.setLongitude((long) six_state.get(18));
        this.pos.setLatitude((long) six_state.get(17));
        // TODO(schwehr): Finish conversion of long lat

        this.sog = (int) six_state.get(6);
        this.cog = (int) six_state.get(9);
        this.pos_latency = (int) six_state.get(1);
        this.spare = (int) six_state.get(1);
    }
}

Message27Test.java

package com.aisparser;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.fail;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;

/** Tests for {@link Message27}. */
@RunWith(JUnit4.class)
public class Message27Test {

    @Test
    public void testParse() {
        Message27 msg = new Message27();

        try {
            Vdm vdm_message = new Vdm();
            int result = vdm_message.add("!AIVDM,1,1,,B,K815>P8=5EikdUet,0*6B");
            assertEquals("vdm add failed", 0, result);
            msg.parse(vdm_message.sixbit());
        } catch (Exception e) {
            fail(e.getMessage());
        }

        assertEquals("msgid", Message27.MSG_ID, msg.msgid());
        assertEquals("repeat", 0, msg.repeat());
        assertEquals("userid", 538005120, msg.userid());
        assertEquals("pos_acc", 1, msg.pos_acc());
        assertEquals("raim", 0, msg.raim());
        assertEquals("nav_status", 0, msg.nav_status());
        // TODO: Can't use pos
        assertEquals("longitude", 214359, msg.longitude()); // -79.641667 deg
        assertEquals("latitude", 14809, msg.latitude()); // 24.681667 deg
        assertEquals("sog", 11, msg.sog());
        assertEquals("cog", 223, msg.cog());
        assertEquals("pos_latency", 0, msg.pos_latency());
        assertEquals("spare", 0, msg.spare());
    }
}