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/*
* Copyright 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 java.net.SocketAddress;
import java.util.Calendar;
import java.util.TimeZone;
import org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.channel.Channel;
import org.traccar.BaseProtocolDecoder;
import org.traccar.helper.BitUtil;
import org.traccar.helper.ChannelBufferTools;
import org.traccar.model.Event;
import org.traccar.model.Position;
public class TzoneProtocolDecoder extends BaseProtocolDecoder {
public TzoneProtocolDecoder(TzoneProtocol protocol) {
super(protocol);
}
@Override
protected Object decode(
Channel channel, SocketAddress remoteAddress, Object msg)
throws Exception {
ChannelBuffer buf = (ChannelBuffer) msg;
buf.skipBytes(2); // header
buf.readUnsignedShort(); // length
buf.readUnsignedShort(); // type
buf.readUnsignedShort(); // model
buf.readUnsignedInt(); // firmware
String imei = ChannelBufferTools.readHexString(buf, 16).substring(1);
if (!identify(imei, channel)) {
return null;
}
buf.skipBytes(6); // device time
Position position = new Position();
position.setProtocol(getProtocolName());
position.setDeviceId(getDeviceId());
int blockLength = buf.readUnsignedShort();
int blockEnd = buf.readerIndex() + blockLength;
if (blockLength == 0) {
return null;
}
position.set(Event.KEY_SATELLITES, buf.readUnsignedByte());
double lat = buf.readUnsignedInt() / 600000.0;
double lon = buf.readUnsignedInt() / 600000.0;
Calendar time = Calendar.getInstance(TimeZone.getTimeZone("UTC"));
time.clear();
time.set(Calendar.YEAR, 2000 + buf.readUnsignedByte());
time.set(Calendar.MONTH, buf.readUnsignedByte() - 1);
time.set(Calendar.DAY_OF_MONTH, buf.readUnsignedByte());
time.set(Calendar.HOUR_OF_DAY, buf.readUnsignedByte());
time.set(Calendar.MINUTE, buf.readUnsignedByte());
time.set(Calendar.SECOND, buf.readUnsignedByte());
position.setTime(time.getTime());
position.setSpeed(buf.readUnsignedShort() * 0.01);
position.set(Event.KEY_ODOMETER, buf.readUnsignedMedium());
int flags = buf.readUnsignedShort();
position.setCourse(BitUtil.range(flags, 0, 9));
position.setLatitude(BitUtil.check(flags, 10) ? lat : -lat);
position.setLongitude(BitUtil.check(flags, 9) ? -lon : lon);
position.setValid(BitUtil.check(flags, 11));
buf.readerIndex(blockEnd);
return position;
}
}
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