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/*
* Copyright 2012 - 2015 Anton Tananaev (anton@traccar.org)
*
* 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 org.jboss.netty.channel.Channel;
import org.traccar.BaseProtocolDecoder;
import org.traccar.DeviceSession;
import org.traccar.helper.Parser;
import org.traccar.helper.PatternBuilder;
import org.traccar.helper.UnitsConverter;
import org.traccar.model.Position;
import java.net.SocketAddress;
import java.util.regex.Pattern;
public class Tr20ProtocolDecoder extends BaseProtocolDecoder {
public Tr20ProtocolDecoder(Tr20Protocol protocol) {
super(protocol);
}
private static final Pattern PATTERN_PING = new PatternBuilder()
.text("%%")
.expression("[^,]+,")
.number("(d+)")
.compile();
private static final Pattern PATTERN_DATA = new PatternBuilder()
.text("%%")
.expression("([^,]+),") // id
.expression("([AL]),") // validity
.number("(dd)(dd)(dd)") // date (yymmdd)
.number("(dd)(dd)(dd),") // time (hhmmss)
.expression("([NS])")
.number("(dd)(dd.d+)") // latitude
.expression("([EW])")
.number("(ddd)(dd.d+),") // longitude
.number("(d+),") // speed
.number("(d+),") // course
.any()
.compile();
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
Parser parser = new Parser(PATTERN_PING, (String) msg);
if (parser.matches()) {
if (channel != null) {
channel.write("&&" + parser.next() + "\r\n"); // keep-alive response
}
return null;
}
parser = new Parser(PATTERN_DATA, (String) msg);
if (!parser.matches()) {
return null;
}
Position position = new Position();
position.setProtocol(getProtocolName());
DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, parser.next());
if (deviceSession == null) {
return null;
}
position.setDeviceId(deviceSession.getDeviceId());
position.setValid(parser.next().equals("A"));
position.setTime(parser.nextDateTime());
position.setLatitude(parser.nextCoordinate(Parser.CoordinateFormat.HEM_DEG_MIN));
position.setLongitude(parser.nextCoordinate(Parser.CoordinateFormat.HEM_DEG_MIN));
position.setSpeed(UnitsConverter.knotsFromKph(parser.nextDouble(0)));
position.setCourse(parser.nextDouble(0));
return position;
}
}
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