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/*
* Copyright 2010 Anton Tananaev (anton@tananaev.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 net.sourceforge.opentracking.protocol.gps103;
import java.util.Calendar;
import java.util.GregorianCalendar;
import java.util.TimeZone;
import java.util.regex.Pattern;
import java.util.regex.Matcher;
import org.jboss.netty.channel.Channel;
import org.jboss.netty.channel.ChannelHandlerContext;
import org.jboss.netty.handler.codec.oneone.OneToOneDecoder;
import org.jboss.netty.channel.ChannelPipelineCoverage;
import net.sourceforge.opentracking.Position;
import net.sourceforge.opentracking.DataManager;
/**
* Gps 103 tracker protocol decoder
*/
@ChannelPipelineCoverage("all")
public class Gps103ProtocolDecoder extends OneToOneDecoder {
/**
* Data manager
*/
private DataManager dataManager;
/**
* Init device table
*/
public Gps103ProtocolDecoder(DataManager newDataManager) {
dataManager = newDataManager;
}
/**
* Regular expressions pattern
*/
static private Pattern pattern = Pattern.compile(
"imei:" +
"([\\d]+)," + // IMEI
"[^,]+," +
"[\\d]+," +
",[FL]," + // F - full / L - low
"([\\d]{2})([\\d]{2})([\\d]{2}).([\\d]{3})," + // Time (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]{2}),"); // Speed
/**
* 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();
Integer index = 1;
// Get device by IMEI
String imei = parser.group(index++);
position.setDeviceId(dataManager.getDeviceByImei(imei).getId());
// Time
Calendar time = new GregorianCalendar(TimeZone.getTimeZone("UTC"));
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++)));
time.set(Calendar.MILLISECOND, Integer.valueOf(parser.group(index++)));
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;
if (parser.group(index++).compareTo("W") == 0) lonlitude = -lonlitude;
position.setLongitude(lonlitude);
// Speed
position.setSpeed(Double.valueOf(parser.group(index++)));
position.setCourse(0.0);
return position;
}
}
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