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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.net.SocketAddress;
import java.nio.charset.Charset;
import java.util.regex.Pattern;
import org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.buffer.ChannelBuffers;
import org.jboss.netty.channel.Channel;
import org.traccar.BaseProtocolDecoder;
import org.traccar.helper.BitUtil;
import org.traccar.helper.ChannelBufferTools;
import org.traccar.helper.DateBuilder;
import org.traccar.helper.Parser;
import org.traccar.helper.PatternBuilder;
import org.traccar.helper.PatternUtil;
import org.traccar.model.Event;
import org.traccar.model.Position;
public class H02ProtocolDecoder extends BaseProtocolDecoder {
public H02ProtocolDecoder(H02Protocol protocol) {
super(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;
}
int length = 6;
if (lon) {
length = 5;
}
result = result * 10 + ChannelBufferTools.readHexInteger(buf, length) * 0.0001;
result /= 60;
result += degrees;
return result;
}
private void processStatus(Position position, long status) {
if (!BitUtil.check(status, 0) || !BitUtil.check(status, 1)
|| !BitUtil.check(status, 3) || !BitUtil.check(status, 4)) {
position.set(Event.KEY_ALARM, true);
}
position.set(Event.KEY_IGNITION, !BitUtil.check(status, 10));
position.set(Event.KEY_STATUS, status);
}
private Position decodeBinary(ChannelBuffer buf, Channel channel) {
Position position = new Position();
position.setProtocol(getProtocolName());
buf.readByte(); // marker
if (!identify(ChannelBuffers.hexDump(buf.readBytes(5)), channel)) {
return null;
}
position.setDeviceId(getDeviceId());
DateBuilder dateBuilder = new DateBuilder()
.setHour(ChannelBufferTools.readHexInteger(buf, 2))
.setMinute(ChannelBufferTools.readHexInteger(buf, 2))
.setSecond(ChannelBufferTools.readHexInteger(buf, 2))
.setDay(ChannelBufferTools.readHexInteger(buf, 2))
.setMonth(ChannelBufferTools.readHexInteger(buf, 2))
.setYear(ChannelBufferTools.readHexInteger(buf, 2));
position.setTime(dateBuilder.getDate());
double latitude = readCoordinate(buf, false);
position.set(Event.KEY_POWER, buf.readByte());
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.setSpeed(ChannelBufferTools.readHexInteger(buf, 3));
position.setCourse((buf.readUnsignedByte() & 0x0f) * 100.0 + ChannelBufferTools.readHexInteger(buf, 2));
processStatus(position, buf.readUnsignedInt());
return position;
}
private static final Pattern PATTERN = new PatternBuilder()
.text("*")
.expression("..,") // manufacturer
.number("(d+),") // imei
.number("Vd,") // version?
.any()
.number("(dd)(dd)(dd),") // time
.expression("([AV])?,") // validity
.groupBegin()
.number("(d+)(dd.d+),") // latitude
.or()
.number("-(d+)-(d+.d+),") // latitude
.groupEnd()
.expression("([NS]),")
.groupBegin()
.number("(d+)(dd.d+),") // longitude
.or()
.number("-(d+)-(d+.d+),") // longitude
.groupEnd()
.expression("([EW]),")
.number("(d+.?d*),") // speed
.number("(d+.?d*)?,") // course
.number("(dd)(dd)(dd),") // date (ddmmyy)
.number("(x{8})") // status
.any()
.compile();
private Position decodeText(String sentence, Channel channel) {
String x = PatternUtil.checkPattern(PATTERN.pattern(), sentence);
Parser parser = new Parser(PATTERN, sentence);
if (!parser.matches()) {
return null;
}
Position position = new Position();
position.setProtocol(getProtocolName());
if (!identify(parser.next(), channel)) {
return null;
}
position.setDeviceId(getDeviceId());
DateBuilder dateBuilder = new DateBuilder()
.setTime(parser.nextInt(), parser.nextInt(), parser.nextInt());
if (parser.hasNext()) {
position.setValid(parser.next().equals("A"));
}
if (parser.hasNext(2)) {
position.setLatitude(parser.nextCoordinate());
}
if (parser.hasNext(2)) {
position.setLatitude(parser.nextCoordinate());
}
if (parser.hasNext(2)) {
position.setLongitude(parser.nextCoordinate());
}
if (parser.hasNext(2)) {
position.setLongitude(parser.nextCoordinate());
}
position.setSpeed(parser.nextDouble());
position.setCourse(parser.nextDouble());
dateBuilder.setDateReverse(parser.nextInt(), parser.nextInt(), parser.nextInt());
position.setTime(dateBuilder.getDate());
processStatus(position, parser.nextLong(16));
return position;
}
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
ChannelBuffer buf = (ChannelBuffer) msg;
String marker = buf.toString(0, 1, Charset.defaultCharset());
// handle X mode?
if (marker.equals("*")) {
return decodeText(buf.toString(Charset.defaultCharset()), channel);
} else if (marker.equals("$")) {
return decodeBinary(buf, channel);
}
return null;
}
}
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