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/*
* Copyright 2012 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.helper.UnitsConverter;
import org.traccar.model.Position;
public class Tr20ProtocolDecoder extends BaseProtocolDecoder {
public Tr20ProtocolDecoder(Tr20Protocol protocol) {
super(protocol);
}
private static final Pattern PATTERN_PING = Pattern.compile(
"%%[^,]+,(\\d+)");
private static final Pattern PATTERN_DATA = Pattern.compile(
"%%" +
"([^,]+)," + // Id
"([AL])," + // Validity
"(\\d{2})(\\d{2})(\\d{2})" + // Date (YYMMDD)
"(\\d{2})(\\d{2})(\\d{2})," + // Time (HHMMSS)
"([NS])" +
"(\\d{2})(\\d{2}\\.\\d+)" + // Latitude (DDMM.MMMM)
"([EW])" +
"(\\d{3})(\\d{2}\\.\\d+)," + // Longitude (DDDMM.MMMM)
"(\\d+)," + // Speed
"(\\d+)," + // Course
".*");
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg)
throws Exception {
String sentence = (String) msg;
// Keep alive message
Matcher parser = PATTERN_PING.matcher(sentence);
if (parser.matches()) {
// Send response
if (channel != null) {
channel.write("&&" + parser.group(1) + "\r\n");
}
} else {
// Data message parse
parser = PATTERN_DATA.matcher(sentence);
// Unknown message
if (!parser.matches()) {
return null;
}
// Create new position
Position position = new Position();
position.setProtocol(getProtocolName());
Integer index = 1;
// Get device by id
if (!identify(parser.group(index++), channel)) {
return null;
}
position.setDeviceId(getDeviceId());
// Validity
position.setValid(parser.group(index++).compareTo("A") == 0);
// Time
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++)));
time.set(Calendar.HOUR_OF_DAY, Integer.parseInt(parser.group(index++)));
time.set(Calendar.MINUTE, Integer.parseInt(parser.group(index++)));
time.set(Calendar.SECOND, Integer.parseInt(parser.group(index++)));
position.setTime(time.getTime());
// Latitude
int hemisphere = 1;
if (parser.group(index++).compareTo("S") == 0) hemisphere = -1;
Double latitude = Double.parseDouble(parser.group(index++));
latitude += Double.parseDouble(parser.group(index++)) / 60;
position.setLatitude(latitude * hemisphere);
// Longitude
hemisphere = 1;
if (parser.group(index++).compareTo("W") == 0) hemisphere = -1;
Double longitude = Double.parseDouble(parser.group(index++));
longitude += Double.parseDouble(parser.group(index++)) / 60;
position.setLongitude(longitude * hemisphere);
// Speed
position.setSpeed(UnitsConverter.knotsFromKph(Double.parseDouble(parser.group(index++))));
// Course
position.setCourse(Double.parseDouble(parser.group(index++)));
return position;
}
return null;
}
}
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