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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.t55;
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 T55ProtocolDecoder extends OneToOneDecoder {
/**
* Data manager
*/
private DataManager dataManager;
/**
* Reset connection delay
*/
private Integer resetDelay;
/**
* Device ID
*/
private Long deviceId;
/**
* Init device table
*/
public T55ProtocolDecoder(DataManager dataManager, Integer resetDelay) {
this.dataManager = dataManager;
this.resetDelay = resetDelay;
}
/**
* Regular expressions pattern
*/
static private Pattern pattern = Pattern.compile(
"\\$GPRMC," +
"(\\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
"(\\d+.\\d{2})?," + // Course
"(\\d{2})(\\d{2})(\\d{2})" + // Date (DDMMYY)
".+"); // Other (Checksumm)
/**
* Decode message
*/
protected Object decode(
ChannelHandlerContext ctx, Channel channel, Object msg)
throws Exception {
String sentence = (String) msg;
//System.out.println(sentence);
// Detect device ID
if (sentence.contains("$PGID")) {
String imei = sentence.substring(6, 6 + 15);
deviceId = dataManager.getDeviceByImei(imei).getId();
}
// Parse message
else if (sentence.contains("$GPRMC") && deviceId != null) {
// Send response
if (channel != null) {
channel.write("OK1\r\n");
}
// Parse message
Matcher parser = pattern.matcher(sentence);
if (!parser.matches()) {
return null;
}
// Create new position
Position position = new Position();
position.setDeviceId(deviceId);
Integer index = 1;
// Time
Calendar time = new GregorianCalendar(TimeZone.getTimeZone("UTC"));
time.clear();
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++)));
index += 1; // Skip milliseconds
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
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++)));
// Altitude
position.setAltitude(0.0);
return position;
}
return null;
}
/**
* 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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