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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.nio.charset.Charset;
import java.util.Calendar;
import java.util.GregorianCalendar;
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.GenericProtocolDecoder;
import org.traccar.helper.Log;
import org.traccar.model.DataManager;
import org.traccar.model.Position;
/**
* Enfora protocol decoder
*/
public class EnforaProtocolDecoder extends GenericProtocolDecoder {
/**
* Initialize
*/
public EnforaProtocolDecoder(DataManager dataManager, Integer resetDelay) {
super(dataManager, resetDelay);
}
/**
* Regular expressions pattern
*/
static private Pattern pattern = Pattern.compile(
"GPRMC," +
"(\\d{2})(\\d{2})(\\d{2}).(\\d{2})," + // Time (HHMMSS.SS)
"([AV])," + // Validity
"(\\d{2})(\\d{2}.\\d{6})," + // Latitude (DDMM.MMMMMM)
"([NS])," +
"(\\d{3})(\\d{2}.\\d{6})," + // Longitude (DDDMM.MMMMMM)
"([EW])," +
"(\\d+.\\d)?," + // Speed
"(\\d+.\\d)?," + // Course
"(\\d{2})(\\d{2})(\\d{2})," + // Date (DDMMYY)
".*[\r\n]*");
public static final int IMEI_LENGTH = 15;
// TODO: avoid copy-paste (from XexunFrameDecoder)
private static Integer find(
ChannelBuffer buf,
Integer start,
Integer length,
String subString) {
int index = start;
boolean match;
for (; index < length; index++) {
match = true;
for (int i = 0; i < subString.length(); i++) {
char c = (char) buf.getByte(index + i);
if (c != subString.charAt(i)) {
match = false;
break;
}
}
if (match) {
return index;
}
}
return null;
}
/**
* Decode message
*/
protected Object decode(
ChannelHandlerContext ctx, Channel channel, Object msg)
throws Exception {
ChannelBuffer buf = (ChannelBuffer) msg;
// Find IMEI (Modem ID)
String imei = null;
for (int first = -1, i = 0; i < buf.readableBytes(); i++) {
if (!Character.isDigit((char) buf.getByte(i))) {
first = i + 1;
}
// Found digit string
if (i - first == IMEI_LENGTH - 1) {
imei = buf.toString(first, IMEI_LENGTH, Charset.defaultCharset());
break;
}
}
// Write log
if (imei == null) {
Log.warning("Enfora decoder failed to find IMEI");
return null;
}
// Find GPSMC string
Integer start = find(buf, 0, buf.readableBytes(), "GPRMC");
if (start == null) {
// Message does not contain GPS data
return null;
}
String sentence = buf.toString(start, buf.readableBytes() - start, Charset.defaultCharset());
// Parse message
Matcher parser = pattern.matcher(sentence);
if (!parser.matches()) {
return null;
}
// Create new position
Position position = new Position();
Integer index = 1;
// Get device by IMEI
position.setDeviceId(getDataManager().getDeviceByImei(imei).getId());
// Time
Calendar time = new GregorianCalendar(TimeZone.getTimeZone("UTC"));
time.clear();
time.set(Calendar.HOUR, 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++)) * 10);
// Validity
position.setValid(parser.group(index++).compareTo("A") == 0 ? true : false);
// 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 lonlitude = Double.valueOf(parser.group(index++));
lonlitude += Double.valueOf(parser.group(index++)) / 60;
if (parser.group(index++).compareTo("W") == 0) lonlitude = -lonlitude;
position.setLongitude(lonlitude);
// 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());
return position;
}
}
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