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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.nio.charset.Charset;
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.buffer.ChannelBuffer;
import org.jboss.netty.channel.Channel;
import org.jboss.netty.channel.ChannelHandlerContext;
import org.traccar.BaseProtocolDecoder;
import org.traccar.model.Event;
import org.traccar.model.Position;
public class Xt7ProtocolDecoder extends BaseProtocolDecoder {
public Xt7ProtocolDecoder(Xt7Protocol 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)
"[^\\*]+\\*[0-9a-fA-F]{2}," +
"(\\d+,\\d+)," + // IMSI
"([0-9a-fA-F]+,[0-9a-fA-F]+)," + // Cell
"(\\d+)," + // Signal quality
"(\\d+)," + // Battery
"([01]{4})," + // Flags
"([01]{4})," + // Sensors
"(\\d+)," + // Fuel
"(.+)?"); // Alarm
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg)
throws Exception {
ChannelBuffer buf = (ChannelBuffer) msg;
buf.skipBytes(3); // STX
// Create new position
Position position = new Position();
position.setProtocol(getProtocolName());
// Get device by id
String id = buf.readBytes(16).toString(Charset.defaultCharset()).trim();
if (!identify(id, channel)) {
return null;
}
position.setDeviceId(getDeviceId());
buf.readUnsignedByte(); // command
int length = buf.readUnsignedByte();
// Parse message
String sentence = buf.readBytes(length).toString(Charset.defaultCharset());
Matcher parser = pattern.matcher(sentence);
if (!parser.matches()) {
return null;
}
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++)));
time.set(Calendar.MILLISECOND, Integer.valueOf(parser.group(index++)));
// 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
position.setSpeed(Double.valueOf(parser.group(index++)));
// 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());
// IMSI
position.set("imsi", parser.group(index++));
// Cell
position.set(Event.KEY_CELL, parser.group(index++));
// GSM signal quality
position.set(Event.KEY_GSM, parser.group(index++));
// Battery
position.set(Event.KEY_POWER, Double.valueOf(parser.group(index++)));
// Flags
position.set(Event.KEY_FLAGS, parser.group(index++));
// Sensors
position.set(Event.KEY_INPUT, parser.group(index++));
// Fuel
position.set(Event.KEY_FUEL, parser.group(index++));
// Alarm
position.set(Event.KEY_ALARM, parser.group(index++));
return position;
}
}
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