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/*
* Copyright 2012 - 2014 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.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.ServerManager;
import org.traccar.database.DataManager;
import org.traccar.helper.ChannelBufferTools;
import org.traccar.helper.Log;
import org.traccar.model.ExtendedInfoFormatter;
import org.traccar.model.Position;
public class H02ProtocolDecoder extends BaseProtocolDecoder {
public H02ProtocolDecoder(DataManager dataManager) {
super(dataManager);
}
public H02ProtocolDecoder(ServerManager serverManager, String protocol) {
super(serverManager, protocol);
}
private static double readCoordinate(ChannelBuffer buf, boolean lon) {
int degrees = ChannelBufferTools.readHexInteger(buf, 2);
if (lon) {
degrees = degrees * 10 + (buf.getUnsignedByte(buf.readerIndex()) >> 4);
}
double result = 0;
if (lon) {
result = buf.readUnsignedByte() & 0x0f;
}
result = result * 10 + ChannelBufferTools.readHexInteger(buf, lon ? 5 : 6) * 0.0001;
result /= 60;
result += degrees;
return result;
}
private Position decodeBinary(ChannelBuffer buf) {
// Create new position
Position position = new Position();
ExtendedInfoFormatter extendedInfo = new ExtendedInfoFormatter(getProtocol());
buf.readByte(); // marker
// Identification
String id = ChannelBufferTools.readHexString(buf, 10);
try {
position.setDeviceId(getDataManager().getDeviceByImei(id).getId());
} catch(Exception error) {
Log.warning("Unknown device - " + id);
return null;
}
// Time
Calendar time = Calendar.getInstance(TimeZone.getTimeZone("UTC"));
time.clear();
time.set(Calendar.HOUR_OF_DAY, ChannelBufferTools.readHexInteger(buf, 2));
time.set(Calendar.MINUTE, ChannelBufferTools.readHexInteger(buf, 2));
time.set(Calendar.SECOND, ChannelBufferTools.readHexInteger(buf, 2));
time.set(Calendar.DAY_OF_MONTH, ChannelBufferTools.readHexInteger(buf, 2));
time.set(Calendar.MONTH, ChannelBufferTools.readHexInteger(buf, 2) - 1);
time.set(Calendar.YEAR, 2000 + ChannelBufferTools.readHexInteger(buf, 2));
position.setTime(time.getTime());
// Location
double latitude = readCoordinate(buf, false);
int x = buf.readByte(); // reserved
double longitude = readCoordinate(buf, true);
int flags = buf.readUnsignedByte() & 0x0f;
position.setValid((flags & 0x02) != 0);
if ((flags & 0x04) == 0) latitude = -latitude;
if ((flags & 0x08) == 0) longitude = -longitude;
position.setLatitude(latitude);
position.setLongitude(longitude);
position.setAltitude(0.0);
// Speed and course
position.setSpeed((double) ChannelBufferTools.readHexInteger(buf, 3));
position.setCourse((buf.readUnsignedByte() & 0x0f) * 100.0 + ChannelBufferTools.readHexInteger(buf, 2));
// Status
extendedInfo.set("status", ChannelBufferTools.readHexString(buf, 8));
position.setExtendedInfo(extendedInfo.toString());
return position;
}
private static final Pattern pattern = Pattern.compile(
"\\*..," + // Manufacturer
"(\\d+)," + // IMEI
"V\\d," + // Version?
".*" +
"(\\d{2})(\\d{2})(\\d{2})," + // Time (HHMMSS)
"([AV])," + // Validity
"(\\d+)(\\d{2}.\\d+)," + // Latitude (DDMM.MMMM)
"([NS])," +
"(\\d+)(\\d{2}.\\d+)," + // Longitude (DDMM.MMMM)
"([EW])," +
"(\\d+.?\\d*)," + // Speed
"(\\d+.?\\d*)?," + // Course
"(\\d{2})(\\d{2})(\\d{2})," + // Date (DDMMYY)
"(\\p{XDigit}{8})" + // Status
".*");
private Position decodeText(String sentence) {
// Parse message
Matcher parser = pattern.matcher(sentence);
if (!parser.matches()) {
return null;
}
// Create new position
Position position = new Position();
ExtendedInfoFormatter extendedInfo = new ExtendedInfoFormatter(getProtocol());
Integer index = 1;
// Get device by IMEI
String imei = parser.group(index++);
try {
position.setDeviceId(getDataManager().getDeviceByImei(imei).getId());
} catch(Exception error) {
Log.warning("Unknown device - " + imei);
return null;
}
// 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++)));
// 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);
// Altitude
position.setAltitude(0.0);
// Speed
position.setSpeed(Double.valueOf(parser.group(index++)));
// Course
String course = parser.group(index++);
if (course != null) {
position.setCourse(Double.valueOf(course));
} else {
position.setCourse(0.0);
}
// 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());
// Status
extendedInfo.set("status", parser.group(index++));
position.setExtendedInfo(extendedInfo.toString());
return position;
}
@Override
protected Object decode(
ChannelHandlerContext ctx, Channel channel, Object msg)
throws Exception {
ChannelBuffer buf = (ChannelBuffer) msg;
String marker = buf.toString(0, 1, Charset.defaultCharset());
// TODO X mode?
if (marker.equals("*")) {
return decodeText(buf.toString(Charset.defaultCharset()));
} else if (marker.equals("$")) {
return decodeBinary(buf);
}
return null;
}
}
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