/*
* Copyright 2012 Alex Wilson <alex@uq.edu.au>
*
* 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.Properties;
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.database.DataManager;
import org.traccar.helper.Log;
import org.traccar.model.Position;
/**
* Maxon Datamax GPS send protocol (NMEA + GPFID)
* As seen in the MA100-1010 router
*
* It sends its identity after the GPRMC sentence, and with the type
* GPFID.
*/
public class MaxonProtocolDecoder extends BaseProtocolDecoder {
/**
* Device ID
*/
private Position position = null;
/**
* Initialize
*/
public MaxonProtocolDecoder(DataManager dataManager, String protocol, Properties properties) {
super(dataManager, protocol, properties);
}
/**
* Regular expressions pattern
*/
static private Pattern pattern = Pattern.compile(
"\\$GPRMC," +
"(\\d{2})(\\d{2})(\\d{2})\\.(\\d{2})," + // Time (HHMMSS.SSS)
"([AV])," + // Validity
"(\\d{2})(\\d{2}\\.\\d{5})," + // Latitude (DDMM.MMMMM)
"([NS])," +
"(\\d{3})(\\d{2}\\.\\d{5})," + // Longitude (DDDMM.MMMMM)
"([EW])," +
"(\\d+\\.\\d{3})?," + // Speed
"(\\d+\\.\\d{2})?," + // Course
"(\\d{2})(\\d{2})(\\d{2})" + // Date (DDMMYY)
".+"); // Other (Checksumm)
static private Pattern gpfidPattern = Pattern.compile(
"\\$GPFID,(\\d+)$");
/**
* Decode message"
*/
protected Object decode(
ChannelHandlerContext ctx, Channel channel, Object msg)
throws Exception {
String sentence = (String) msg;
// Detect device ID
// Parse message
if (sentence.contains("$GPRMC")) {
// Parse message
Matcher parser = pattern.matcher(sentence);
if (!parser.matches()) {
return null;
}
// Create new position
position = new Position();
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++)));
index += 1; // Skip milliseconds
// Validity
position.setValid(parser.group(index++).compareTo("A") == 0 ? true : false);
// 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);
// Speed
String speed = parser.group(index++);
if (speed != null) {
position.setSpeed(Double.valueOf(speed));
} else {
position.setSpeed(0.0);
}
// Course
String course = parser.group(index++);
if (course != null) {
position.setCourse(Double.valueOf(course));
} else {
position.setCourse(0.0);
}
// 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());
// Altitude
position.setAltitude(0.0);
} else if (sentence.contains("$GPFID") && position != null) {
Matcher parser = gpfidPattern.matcher(sentence);
if (parser.matches()) {
String imei = parser.group(1);
try {
position.setDeviceId(getDataManager().getDeviceByImei(imei).getId());
} catch(Exception error) {
Log.warning("Unknown device - " + imei);
return null;
}
return position;
}
}
return null;
}
}