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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.tk103;
import java.util.Calendar;
import java.util.GregorianCalendar;
import java.util.TimeZone;
import java.util.Timer;
import java.util.TimerTask;
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 net.sourceforge.opentracking.Position;
import net.sourceforge.opentracking.DataManager;
import org.jboss.netty.channel.ChannelEvent;
import org.jboss.netty.channel.ChannelState;
import org.jboss.netty.channel.ChannelStateEvent;
/**
* Gps 103 tracker protocol decoder
*/
public class Tk103ProtocolDecoder extends OneToOneDecoder {
/**
* Data manager
*/
private DataManager dataManager;
/**
* Reset connection delay
*/
private Integer resetDelay;
/**
* Init device table
*/
public Tk103ProtocolDecoder(DataManager dataManager, Integer resetDelay) {
this.dataManager = dataManager;
this.resetDelay = resetDelay;
}
/**
* Regular expressions pattern
*/
static private Pattern pattern = Pattern.compile(
"\\(" +
"(\\d+)" + // Device ID
"(.{4})" + // Command
"(\\d{15})" + // IMEI (?)
"(\\d{2})(\\d{2})(\\d{2})" + // Date (YYMMDD)
"([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{2})(\\d{2})(\\d{2})" + // Time (HHMMSS)
"(\\d+.\\d{2})" + // Course
"(\\d+)" + // State
".+"); // Mileage (?)
/**
* Decode message
*/
protected Object decode(
ChannelHandlerContext ctx, Channel channel, Object msg)
throws Exception {
String sentence = (String) msg;
// TODO: Send response (?)
// Parse message
Matcher parser = pattern.matcher(sentence);
if (!parser.matches()) {
return null;
}
// Create new position
Position position = new Position();
Integer index = 1;
index += 2; // Skip Device ID and command
// Get device by IMEI
String imei = parser.group(index++);
position.setDeviceId(dataManager.getDeviceByImei(imei).getId());
// Date
Calendar time = new GregorianCalendar(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++)));
// 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);
// Altitude
position.setAltitude(0.0);
// Speed
position.setSpeed(Double.valueOf(parser.group(index++)));
// Time
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());
// Course
position.setCourse(Double.valueOf(parser.group(index++)));
return position;
}
/**
* Disconnect channel
*/
class DisconnectTask extends TimerTask {
private Channel channel;
public DisconnectTask(Channel channel) {
this.channel = channel;
}
public void run() {
channel.disconnect();
}
}
/**
* Handle connect event
*/
@Override
public void handleUpstream(ChannelHandlerContext ctx, ChannelEvent evt) throws Exception {
super.handleUpstream(ctx, evt);
if (evt instanceof ChannelStateEvent) {
ChannelStateEvent event = (ChannelStateEvent) evt;
if (event.getState() == ChannelState.CONNECTED && event.getValue() != null && resetDelay != 0) {
new Timer().schedule(new DisconnectTask(evt.getChannel()), resetDelay);
}
}
}
}
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