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/*
* Copyright 2012 - 2015 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.net.SocketAddress;
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.traccar.BaseProtocolDecoder;
import org.traccar.model.Event;
import org.traccar.model.Position;
public class Gps103ProtocolDecoder extends BaseProtocolDecoder {
public Gps103ProtocolDecoder(Gps103Protocol protocol) {
super(protocol);
}
private static final Pattern PATTERN = Pattern.compile(
"imei:" +
"(\\d+)," + // IMEI
"([^,]+)," + // Alarm
"(\\d{2})/?(\\d{2})/?(\\d{2})\\s?" + // Local Date
"(\\d{2}):?(\\d{2})(?:\\d{2})?," + // Local Time
"[^,]*," +
"[FL]," + // F - full / L - low
"(?:(\\d{2})(\\d{2})(\\d{2})\\.(\\d+)|" + // Time UTC (HHMMSS.SSS)
"(?:\\d{1,5}\\.\\d+))," +
"([AV])," + // Validity
"(?:([NS]),)?" +
"(\\d+)(\\d{2}\\.\\d+)," + // Latitude (DDMM.MMMM)
"(?:([NS]),)?" +
"(?:([EW]),)?" +
"(\\d+)(\\d{2}\\.\\d+)," + // Longitude (DDDMM.MMMM)
"(?:([EW])?,)?" +
"(\\d+\\.?\\d*)?,?" + // Speed
"(\\d+\\.?\\d*)?,?" + // Course
"(\\d+\\.?\\d*)?,?" + // Altitude
"([^,;]+)?,?" +
"([^,;]+)?,?" +
"([^,;]+)?,?" +
"([^,;]+)?,?" +
"([^,;]+)?,?" +
".*");
private static final Pattern PATTERN_HANDSHAKE = Pattern.compile("##,imei:(\\d+),A");
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg)
throws Exception {
String sentence = (String) msg;
// Send response #1
if (sentence.contains("##")) {
if (channel != null) {
channel.write("LOAD", remoteAddress);
Matcher handshakeMatcher = PATTERN_HANDSHAKE.matcher(sentence);
if (handshakeMatcher.matches()) {
identify(handshakeMatcher.group(1), channel);
}
}
return null;
}
// Send response #2
if (sentence.length() == 15 && Character.isDigit(sentence.charAt(0))) {
if (channel != null) {
channel.write("ON", remoteAddress);
}
return null;
}
// Parse message
Matcher parser = PATTERN.matcher(sentence);
if (!parser.matches()) {
return null;
}
// Create new position
Position position = new Position();
position.setProtocol(getProtocolName());
Integer index = 1;
// Get device by IMEI
String imei = parser.group(index++);
if (!identify(imei, channel, remoteAddress)) {
return null;
}
position.setDeviceId(getDeviceId());
// Alarm message
String alarm = parser.group(index++);
position.set(Event.KEY_ALARM, alarm);
if (channel != null && alarm.equals("help me")) {
channel.write("**,imei:" + imei + ",E;", remoteAddress);
}
// Date
Calendar time = Calendar.getInstance(TimeZone.getTimeZone("UTC"));
time.clear();
time.set(Calendar.YEAR, 2000 + Integer.parseInt(parser.group(index++)));
time.set(Calendar.MONTH, Integer.parseInt(parser.group(index++)) - 1);
time.set(Calendar.DAY_OF_MONTH, Integer.parseInt(parser.group(index++)));
int localHours = Integer.parseInt(parser.group(index++));
int localMinutes = Integer.parseInt(parser.group(index++));
String utcHours = parser.group(index++);
String utcMinutes = parser.group(index++);
// Time
time.set(Calendar.HOUR_OF_DAY, localHours);
time.set(Calendar.MINUTE, localMinutes);
String seconds = parser.group(index++);
if (seconds != null) {
time.set(Calendar.SECOND, Integer.parseInt(seconds));
}
String milliseconds = parser.group(index++);
if (milliseconds != null) {
time.set(Calendar.MILLISECOND, Integer.parseInt(milliseconds));
}
// Timezone calculation
if (utcHours != null && utcMinutes != null) {
int deltaMinutes = (localHours - Integer.parseInt(utcHours)) * 60;
deltaMinutes += localMinutes - Integer.parseInt(utcMinutes);
if (deltaMinutes <= -12 * 60) {
deltaMinutes += 24 * 60;
} else if (deltaMinutes > 12 * 60) {
deltaMinutes -= 24 * 60;
}
time.add(Calendar.MINUTE, -deltaMinutes);
}
position.setTime(time.getTime());
// Validity
position.setValid(parser.group(index++).compareTo("A") == 0);
// Latitude
String hemisphere = parser.group(index++);
Double latitude = Double.parseDouble(parser.group(index++));
latitude += Double.parseDouble(parser.group(index++)) / 60;
if (parser.group(index) != null) {
hemisphere = parser.group(index);
}
index++;
if (hemisphere.compareTo("S") == 0) {
latitude = -latitude;
}
position.setLatitude(latitude);
// Longitude
hemisphere = parser.group(index++);
Double longitude = Double.parseDouble(parser.group(index++));
longitude += Double.parseDouble(parser.group(index++)) / 60;
if (parser.group(index) != null) {
hemisphere = parser.group(index);
}
index++;
if (hemisphere != null && hemisphere.compareTo("W") == 0) {
longitude = -longitude;
}
position.setLongitude(longitude);
// Speed
String speed = parser.group(index++);
if (speed != null) {
position.setSpeed(Double.parseDouble(speed));
}
// Course
String course = parser.group(index++);
if (course != null) {
position.setCourse(Double.parseDouble(course));
}
// Altitude
String altitude = parser.group(index++);
if (altitude != null) {
position.setAltitude(Double.parseDouble(altitude));
}
// Additional data
for (int i = 1; i <= 5; i++) {
position.set(Event.PREFIX_IO + i, parser.group(index++));
}
return position;
}
}
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