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/*
* Copyright 2013 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.BaseProtocolDecoder;
import org.traccar.helper.Crc;
import org.traccar.model.Position;
public class GpsGateProtocolDecoder extends BaseProtocolDecoder {
public GpsGateProtocolDecoder(String protocol) {
super(protocol);
}
private static final Pattern pattern = Pattern.compile(
"\\$GPRMC," +
"(\\d{2})(\\d{2})(\\d{2})\\.?(\\d+)?," + // Time (HHMMSS.SSS)
"([AV])," + // Validity
"(\\d{2})(\\d{2}\\.\\d+)," + // Latitude (DDMM.MMMM)
"([NS])," +
"(\\d{3})(\\d{2}\\.\\d+)," + // Longitude (DDDMM.MMMM)
"([EW])," +
"(\\d+\\.\\d+)?," + // Speed
"(\\d+\\.\\d+)?," + // Course
"(\\d{2})(\\d{2})(\\d{2})" + // Date (DDMMYY)
".+"); // Other (Checksumm)
private void send(Channel channel, String message) {
if (channel != null) {
channel.write(message + Crc.nmeaChecksum(message) + "\r\n");
}
}
@Override
protected Object decode(
ChannelHandlerContext ctx, Channel channel, Object msg)
throws Exception {
String sentence = (String) msg;
// Process login
if (sentence.startsWith("$FRLIN,")) {
int beginIndex = sentence.indexOf(',', 7);
if (beginIndex != -1) {
beginIndex += 1;
int endIndex = sentence.indexOf(',', beginIndex);
if (endIndex != -1) {
String imei = sentence.substring(beginIndex, endIndex);
if (identify(imei)) {
if (channel != null) {
send(channel, "$FRSES," + channel.getId());
}
} else {
send(channel, "$FRERR,AuthError,Unknown device");
}
} else {
send(channel, "$FRERR,AuthError,Parse error");
}
} else {
send(channel, "$FRERR,AuthError,Parse error");
}
}
// Protocol version check
else if (sentence.startsWith("$FRVER,")) {
send(channel, "$FRVER,1,0,GpsGate Server 1.0");
}
// Process data
else if (sentence.startsWith("$GPRMC,") && hasDeviceId()) {
// Parse message
Matcher parser = pattern.matcher(sentence);
if (!parser.matches()) {
return null;
}
// Create new position
Position position = new Position();
position.setProtocol(getProtocol());
position.setDeviceId(getDeviceId());
Integer index = 1;
// Time
Calendar time = Calendar.getInstance(TimeZone.getTimeZone("UTC"));
time.clear();
time.set(Calendar.HOUR_OF_DAY, 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
// Validity
position.setValid(parser.group(index++).compareTo("A") == 0);
// 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 longitude = Double.valueOf(parser.group(index++));
longitude += Double.valueOf(parser.group(index++)) / 60;
if (parser.group(index++).compareTo("W") == 0) longitude = -longitude;
position.setLongitude(longitude);
// Speed
String speed = parser.group(index++);
if (speed != null) {
position.setSpeed(Double.valueOf(speed));
}
// Course
String course = parser.group(index++);
if (course != null) {
position.setCourse(Double.valueOf(course));
}
// 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++)));
position.setTime(time.getTime());
return position;
}
return null;
}
}
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