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/*
* Copyright 2013 - 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.regex.Pattern;
import org.jboss.netty.channel.Channel;
import org.traccar.BaseProtocolDecoder;
import org.traccar.helper.Checksum;
import org.traccar.helper.DateBuilder;
import org.traccar.helper.Parser;
import org.traccar.helper.PatternBuilder;
import org.traccar.model.Position;
public class GpsGateProtocolDecoder extends BaseProtocolDecoder {
public GpsGateProtocolDecoder(GpsGateProtocol protocol) {
super(protocol);
}
private static final Pattern PATTERN = new PatternBuilder()
.text("$GPRMC,")
.number("(dd)(dd)(dd).?(d+)?,") // time
.expression("([AV]),") // validity
.number("(dd)(dd.d+),") // latitude
.expression("([NS]),")
.number("(ddd)(dd.d+),") // longitude
.expression("([EW]),")
.number("(d+.d+)?,") // speed
.number("(d+.d+)?,") // course
.number("(dd)(dd)(dd)") // date (ddmmyy)
.any()
.compile();
private void send(Channel channel, String message) {
if (channel != null) {
channel.write(message + Checksum.nmea(message) + "\r\n");
}
}
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
String sentence = (String) msg;
if (sentence.startsWith("$FRLIN,")) {
// Login
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, channel)) {
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");
}
} else if (sentence.startsWith("$FRVER,")) {
// Version check
send(channel, "$FRVER,1,0,GpsGate Server 1.0");
} else if (sentence.startsWith("$GPRMC,") && hasDeviceId()) {
Parser parser = new Parser(PATTERN, sentence);
if (!parser.matches()) {
return null;
}
Position position = new Position();
position.setProtocol(getProtocolName());
position.setDeviceId(getDeviceId());
DateBuilder dateBuilder = new DateBuilder()
.setTime(parser.nextInt(), parser.nextInt(), parser.nextInt(), parser.nextInt());
position.setValid(parser.next().equals("A"));
position.setLatitude(parser.nextCoordinate());
position.setLongitude(parser.nextCoordinate());
position.setSpeed(parser.nextDouble());
position.setCourse(parser.nextDouble());
dateBuilder.setDateReverse(parser.nextInt(), parser.nextInt(), parser.nextInt());
position.setTime(dateBuilder.getDate());
return position;
}
return null;
}
}
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