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/*
* Copyright 2012 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.ServerManager;
import org.traccar.helper.Log;
import org.traccar.model.Position;
/**
* Gps 103 tracker protocol decoder
*/
public class Gps103ProtocolDecoder extends BaseProtocolDecoder {
/**
* Initialize
*/
public Gps103ProtocolDecoder(ServerManager serverManager) {
super(serverManager);
}
/**
* Regular expressions pattern
*/
static private Pattern pattern = Pattern.compile(
"imei:" +
"(\\d+)," + // IMEI
"([^,]+)," + // Alarm
"(\\d{2})(\\d{2})(\\d{2})" + // Local Date
"(\\d{2})(\\d{2})," + // Local Time
"[^,]*," +
"[FL]," + // F - full / L - low
"(\\d{2})(\\d{2})(\\d{2})\\.(\\d{3})," + // Time UTC (HHMMSS.SSS)
"([AV])," + // Validity
"(\\d{2})(\\d{2}\\.\\d{4})," + // Latitude (DDMM.MMMM)
"([NS])," +
"(\\d{3})(\\d{2}\\.\\d{4})," + // Longitude (DDDMM.MMMM)
"([EW])?," +
"(\\d+\\.?\\d*)," + // Speed
"(\\d+\\.\\d+)?" + // Course
".*");
/**
* Decode message
*/
@Override
protected Object decode(
ChannelHandlerContext ctx, Channel channel, Object msg)
throws Exception {
String sentence = (String) msg;
// Send response #1
if (sentence.contains("##")) {
channel.write("LOAD");
return null;
}
// Send response #2
if (sentence.length() == 15 && Character.isDigit(sentence.charAt(0))) {
channel.write("ON");
return null;
}
// Parse message
Matcher parser = pattern.matcher(sentence);
if (!parser.matches()) {
Log.info("Parsing error");
return null;
}
// Create new position
Position position = new Position();
StringBuilder extendedInfo = new StringBuilder("<protocol>gps103</protocol>");
Integer index = 1;
// Get device by IMEI
String imei = parser.group(index++);
/*try {
position.setDeviceId(getDataManager().getDeviceByImei(imei).getId());
} catch(Exception error) {
Log.warning("Unknown device - " + imei);
return null;
}*/
// Alarm message
extendedInfo.append("<alarm>");
extendedInfo.append(parser.group(index++));
extendedInfo.append("</alarm>");
// Date
Calendar time = Calendar.getInstance(TimeZone.getTimeZone("UTC"));
time.clear();
time.set(Calendar.YEAR, 2000 + Integer.valueOf(parser.group(index++)));
time.set(Calendar.MONTH, Integer.valueOf(parser.group(index++)) - 1);
time.set(Calendar.DAY_OF_MONTH, Integer.valueOf(parser.group(index++)));
int localHours = Integer.valueOf(parser.group(index++));
int localMinutes = Integer.valueOf(parser.group(index++));
int utcHours = Integer.valueOf(parser.group(index++));
int utcMinutes = Integer.valueOf(parser.group(index++));
// Time
time.set(Calendar.HOUR, localHours);
time.set(Calendar.MINUTE, localMinutes);
time.set(Calendar.SECOND, Integer.valueOf(parser.group(index++)));
time.set(Calendar.MILLISECOND, Integer.valueOf(parser.group(index++)));
// Timezone calculation
int deltaMinutes = (localHours - utcHours) * 60 + localMinutes - utcMinutes;
if (deltaMinutes <= -12 * 60) {
deltaMinutes += 24 * 60;
} else if (deltaMinutes > 12) {
deltaMinutes -= 24 * 60;
}
time.add(Calendar.MINUTE, -deltaMinutes);
position.setTime(time.getTime());
// 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 lonlitude = Double.valueOf(parser.group(index++));
lonlitude += Double.valueOf(parser.group(index++)) / 60;
String hemisphere = parser.group(index++);
if (hemisphere != null) {
if (hemisphere.compareTo("W") == 0) lonlitude = -lonlitude;
}
position.setLongitude(lonlitude);
// Altitude
position.setAltitude(0.0);
// Speed
position.setSpeed(Double.valueOf(parser.group(index++)));
// Course
String course = parser.group(index++);
if (course != null) {
position.setCourse(Double.valueOf(course));
} else {
position.setCourse(0.0);
}
// Extended info
position.setExtendedInfo(extendedInfo.toString());
return position;
}
}
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