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/*
* Copyright 2014 Anton Tananaev (anton.tananaev@gmail.com)
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.traccar.protocol;
import java.util.Calendar;
import java.util.TimeZone;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.jboss.netty.channel.Channel;
import org.jboss.netty.channel.ChannelHandlerContext;
import org.traccar.BaseProtocolDecoder;
import org.traccar.model.Position;
public class TrackboxProtocolDecoder extends BaseProtocolDecoder {
public TrackboxProtocolDecoder(String protocol) {
super(protocol);
}
private static final Pattern pattern = Pattern.compile(
"(\\d{2})(\\d{2})(\\d{2})\\.(\\d{3})," + // Time
"(\\d{2})(\\d{2}\\.\\d{4})([NS])," + // Latitude (DDMM.MMMM)
"(\\d{3})(\\d{2}\\.\\d{4})([EW])," + // Longitude (DDDMM.MMMM)
"(\\d+\\.\\d)," + // HDOP
"(-?\\d+\\.?\\d*)," + // Altitude
"(\\d)," + // Fix Type
"(\\d+\\.\\d+)," + // Course
"(\\d+\\.\\d+)," + // Speed (kph)
"(\\d+\\.\\d+)," + // Speed (knots)
"(\\d{2})(\\d{2})(\\d{2})," + // Date
"(\\d+)"); // Satellites
private void sendResponse(Channel channel) {
if (channel != null) {
channel.write("=OK=\r\n");
}
}
@Override
protected Object decode(
ChannelHandlerContext ctx, Channel channel, Object msg)
throws Exception {
String sentence = (String) msg;
if (sentence.startsWith("a=connect")) {
String id = sentence.substring(sentence.indexOf("i=") + 2);
if (identify(id)) {
sendResponse(channel);
}
}
else {
// Parse message
Matcher parser = pattern.matcher(sentence);
if (!parser.matches()) {
return null;
}
sendResponse(channel);
// Create new position
Position position = new Position();
position.setDeviceId(getDeviceId());
position.setProtocol(getProtocol());
Integer index = 1;
// Time
Calendar time = Calendar.getInstance(TimeZone.getTimeZone("UTC"));
time.clear();
time.set(Calendar.HOUR_OF_DAY, Integer.valueOf(parser.group(index++)));
time.set(Calendar.MINUTE, Integer.valueOf(parser.group(index++)));
time.set(Calendar.SECOND, Integer.valueOf(parser.group(index++)));
time.set(Calendar.MILLISECOND, Integer.valueOf(parser.group(index++)));
// Latitude
Double latitude = Double.valueOf(parser.group(index++));
latitude += Double.valueOf(parser.group(index++)) / 60;
if (parser.group(index++).compareTo("S") == 0) latitude = -latitude;
position.setLatitude(latitude);
// Longitude
Double longitude = Double.valueOf(parser.group(index++));
longitude += Double.valueOf(parser.group(index++)) / 60;
if (parser.group(index++).compareTo("W") == 0) longitude = -longitude;
position.setLongitude(longitude);
// HDOP
position.set("hdop", parser.group(index++));
// Altitude
position.setAltitude(Double.valueOf(parser.group(index++)));
// Validity
int fix = Integer.valueOf(parser.group(index++));
position.set("fix", fix);
position.setValid(fix > 0);
// Course
position.setCourse(Double.valueOf(parser.group(index++)));
// Speed
index += 1; // speed in kph
position.setSpeed(Double.valueOf(parser.group(index++)));
// Date
time.set(Calendar.DAY_OF_MONTH, Integer.valueOf(parser.group(index++)));
time.set(Calendar.MONTH, Integer.valueOf(parser.group(index++)) - 1);
time.set(Calendar.YEAR, 2000 + Integer.valueOf(parser.group(index++)));
position.setTime(time.getTime());
// Satellites
position.set("satellites", parser.group(index++));
return position;
}
return null;
}
}
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