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/*
* Copyright 2012 - 2015 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 org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.buffer.ChannelBufferIndexFinder;
import org.jboss.netty.channel.Channel;
import org.traccar.BaseProtocolDecoder;
import org.traccar.helper.DateBuilder;
import org.traccar.helper.Parser;
import org.traccar.helper.PatternBuilder;
import org.traccar.helper.StringFinder;
import org.traccar.model.Position;
import java.net.SocketAddress;
import java.nio.charset.StandardCharsets;
import java.util.regex.Pattern;
public class EnforaProtocolDecoder extends BaseProtocolDecoder {
public EnforaProtocolDecoder(EnforaProtocol protocol) {
super(protocol);
}
private static final Pattern PATTERN = new PatternBuilder()
.text("GPRMC,")
.number("(dd)(dd)(dd).(d+),") // time
.expression("([AV]),") // validity
.number("(dd)(dd.d+),") // latitude
.expression("([NS]),")
.number("(ddd)(dd.d+),") // longitude
.expression("([EW]),")
.number("(d+.d+)?,") // speed
.number("(d+.d+)?,") // course
.number("(dd)(dd)(dd),") // date (ddmmyy)
.any()
.compile();
public static final int IMEI_LENGTH = 15;
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
ChannelBuffer buf = (ChannelBuffer) msg;
// Find IMEI number
int index = buf.indexOf(buf.readerIndex(), buf.writerIndex(), new ChannelBufferIndexFinder() {
@Override
public boolean find(ChannelBuffer buffer, int guessedIndex) {
if (buffer.writerIndex() - guessedIndex >= IMEI_LENGTH) {
for (int i = 0; i < IMEI_LENGTH; i++) {
if (!Character.isDigit((char) buffer.getByte(guessedIndex + i))) {
return false;
}
}
return true;
}
return false;
}
});
if (index == -1) {
return null;
}
String imei = buf.toString(index, IMEI_LENGTH, StandardCharsets.US_ASCII);
if (!identify(imei, channel, remoteAddress)) {
return null;
}
// Find NMEA sentence
int start = buf.indexOf(buf.readerIndex(), buf.writerIndex(), new StringFinder("GPRMC"));
if (start == -1) {
return null;
}
String sentence = buf.toString(start, buf.readableBytes() - start, StandardCharsets.US_ASCII);
Parser parser = new Parser(PATTERN, sentence);
if (!parser.matches()) {
return null;
}
Position position = new Position();
position.setProtocol(getProtocolName());
position.setDeviceId(getDeviceId());
DateBuilder dateBuilder = new DateBuilder()
.setTime(parser.nextInt(), parser.nextInt(), parser.nextInt(), parser.nextInt());
position.setValid(parser.next().equals("A"));
position.setLatitude(parser.nextCoordinate());
position.setLongitude(parser.nextCoordinate());
position.setSpeed(parser.nextDouble());
position.setCourse(parser.nextDouble());
dateBuilder.setDateReverse(parser.nextInt(), parser.nextInt(), parser.nextInt());
position.setTime(dateBuilder.getDate());
return position;
}
}
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