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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.GenericProtocolDecoder;
import org.traccar.helper.Log;
import org.traccar.model.DataManager;
import org.traccar.model.Position;
/**
* Meitrack protocol decoder
*/
public class MeitrackProtocolDecoder extends GenericProtocolDecoder {
/**
* Initialize
*/
public MeitrackProtocolDecoder(DataManager dataManager) {
super(dataManager);
}
/**
* Regular expressions pattern
*/
static private Pattern pattern = Pattern.compile(
"\\$\\$." + // Flag
"\\d+," + // Length
"(\\d+)," + // IMEI
"[0-9a-fA-F]{3}," + // Command
"(\\d+)," + // Event
"(-?\\d+\\.\\d+)," + // Latitude
"(-?\\d+\\.\\d+)," + // Longitude
"(\\d{2})(\\d{2})(\\d{2})" + // Date (YYMMDD)
"(\\d{2})(\\d{2})(\\d{2})," + // Time (HHMMSS)
"([AV])," + // Validity
"(\\d+)," + // Satellites
"(\\d+)," + // GSM Signal
"(\\d+)," + // Speed
"(\\d+)," + // Course
"(\\d+)," + // HDOP
"(\\d+)," + // Altitude
"(\\d+)," + // Milage
".*"); // TODO: parse other stuff
/**
* Decode message
*/
protected Object decode(
ChannelHandlerContext ctx, Channel channel, Object msg)
throws Exception {
// Parse message
String sentence = (String) msg;
Matcher parser = pattern.matcher(sentence);
if (!parser.matches()) {
return null;
}
// Create new position
Position position = new Position();
StringBuilder extendedInfo = new StringBuilder("<protocol>meitrack</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;
}
// Event
extendedInfo.append("<event>");
extendedInfo.append(parser.group(index++));
extendedInfo.append("</event>");
// Coordinates
position.setLatitude(Double.valueOf(parser.group(index++)));
position.setLongitude(Double.valueOf(parser.group(index++)));
// Time
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++)));
time.set(Calendar.HOUR, Integer.valueOf(parser.group(index++)));
time.set(Calendar.MINUTE, Integer.valueOf(parser.group(index++)));
time.set(Calendar.SECOND, Integer.valueOf(parser.group(index++)));
position.setTime(time.getTime());
// Validity
position.setValid(parser.group(index++).compareTo("A") == 0 ? true : false);
// Satellites
extendedInfo.append("<satellites>");
extendedInfo.append(parser.group(index++));
extendedInfo.append("</satellites>");
// GSM Signal
extendedInfo.append("<gsm>");
extendedInfo.append(parser.group(index++));
extendedInfo.append("</gsm>");
// Speed
position.setSpeed(Double.valueOf(parser.group(index++)));
// Course
position.setCourse(Double.valueOf(parser.group(index++)));
// HDOP
extendedInfo.append("<hdop>");
extendedInfo.append(parser.group(index++));
extendedInfo.append("</hdop>");
// Altitude
position.setAltitude(Double.valueOf(parser.group(index++)));
// Milage
extendedInfo.append("<milage>");
extendedInfo.append(parser.group(index++));
extendedInfo.append("</milage>");
// Extended info
position.setExtendedInfo(extendedInfo.toString());
return position;
}
}
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