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/*
* Copyright 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.util.Calendar;
import java.util.LinkedList;
import java.util.List;
import java.util.TimeZone;
import org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.buffer.ChannelBuffers;
import org.jboss.netty.channel.Channel;
import org.jboss.netty.channel.ChannelHandlerContext;
import org.traccar.BaseProtocolDecoder;
import org.traccar.model.Event;
import org.traccar.model.Position;
public class OrionProtocolDecoder extends BaseProtocolDecoder {
public OrionProtocolDecoder(String protocol) {
super(protocol);
}
private static final int TYPE_USERLOG = 0;
private static final int TYPE_SYSLOG = 3;
private static void sendResponse(Channel channel, ChannelBuffer buf) {
if (channel != null) {
ChannelBuffer response = ChannelBuffers.directBuffer(4);
response.writeByte('*');
response.writeShort(buf.getUnsignedShort(buf.writerIndex() - 2));
response.writeByte(buf.getUnsignedByte(buf.writerIndex() - 3));
channel.write(response);
}
}
private static double convertCoordinate(int value) {
double degrees = value / 1000000;
double minutes = (value % 1000000) / 10000.0;
return degrees + minutes / 60;
}
@Override
protected Object decode(
ChannelHandlerContext ctx, Channel channel, Object msg)
throws Exception {
ChannelBuffer buf = (ChannelBuffer) msg;
buf.skipBytes(2); // header
int type = buf.readUnsignedByte() & 0x0f;
if (type == TYPE_USERLOG) {
int header = buf.readUnsignedByte();
if ((header & 0x40) != 0) {
sendResponse(channel, buf);
}
if (!identify(String.valueOf(buf.readUnsignedInt()))) {
return null;
}
List<Position> positions = new LinkedList<Position>();
for (int i = 0; i < (header & 0x0f); i++) {
// Create new position
Position position = new Position();
position.setDeviceId(getDeviceId());
position.setProtocol(getProtocol());
position.set(Event.KEY_EVENT, buf.readUnsignedByte());
buf.readUnsignedByte(); // length
position.set(Event.KEY_FLAGS, buf.readUnsignedShort());
// Location
position.setLatitude(convertCoordinate(buf.readInt()));
position.setLongitude(convertCoordinate(buf.readInt()));
position.setAltitude(buf.readShort()/ 10.0);
position.setCourse(buf.readUnsignedShort());
position.setSpeed(buf.readUnsignedShort() * 0.0539957);
// Date and time
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());
// Accuracy
int satellites = buf.readUnsignedByte();
position.set(Event.KEY_SATELLITES, satellites);
position.setValid(satellites >= 3);
positions.add(position);
}
return positions;
}
return null;
}
}
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