Java tutorial
/* * Copyright 2012 - 2018 Anton Tananaev (anton@traccar.org) * Copyright 2012 Luis Parada (luis.parada@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 io.netty.buffer.ByteBuf; import io.netty.buffer.Unpooled; import io.netty.channel.Channel; import org.traccar.BaseProtocolDecoder; import org.traccar.Context; import org.traccar.DeviceSession; import org.traccar.NetworkMessage; import org.traccar.Protocol; import org.traccar.helper.DateBuilder; import org.traccar.helper.Parser; import org.traccar.helper.PatternBuilder; import org.traccar.model.Position; import java.net.SocketAddress; import java.nio.charset.StandardCharsets; import java.util.regex.Pattern; public class Pt502ProtocolDecoder extends BaseProtocolDecoder { private static final int MAX_CHUNK_SIZE = 960; private ByteBuf photo; public Pt502ProtocolDecoder(Protocol protocol) { super(protocol); } private static final Pattern PATTERN = new PatternBuilder().any().text("$").expression("([^,]+),") // type .number("(d+),") // id .number("(dd)(dd)(dd).(ddd),") // time (hhmmss.sss) .expression("([AV]),") // validity .number("(d+)(dd.dddd),") // latitude .expression("([NS]),").number("(d+)(dd.dddd),") // longitude .expression("([EW]),").number("(d+.d+)?,") // speed .number("(d+.d+)?,") // course .number("(dd)(dd)(dd),,,") // date (ddmmyy) .expression("./").expression("([01])+,") // input .expression("([01])+/") // output .expression("([^/]+)?/") // adc .number("(d+)") // odometer .expression("/([^/]+)?/") // rfid .number("(xxx)").optional(2) // state .any().compile(); private String decodeAlarm(String value) { switch (value) { case "IN1": return Position.ALARM_SOS; case "GOF": return Position.ALARM_GEOFENCE; case "TOW": return Position.ALARM_TOW; case "HDA": return Position.ALARM_ACCELERATION; case "HDB": return Position.ALARM_BRAKING; case "FDA": return Position.ALARM_FATIGUE_DRIVING; case "SKA": return Position.ALARM_VIBRATION; case "PMA": return Position.ALARM_MOVEMENT; case "CPA": return Position.ALARM_POWER_CUT; default: return null; } } private Position decodePosition(Channel channel, SocketAddress remoteAddress, String sentence) { Parser parser = new Parser(PATTERN, sentence); if (!parser.matches()) { return null; } Position position = new Position(getProtocolName()); position.set(Position.KEY_ALARM, decodeAlarm(parser.next())); DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, parser.next()); if (deviceSession == null) { return null; } position.setDeviceId(deviceSession.getDeviceId()); DateBuilder dateBuilder = new DateBuilder().setTime(parser.nextInt(0), parser.nextInt(0), parser.nextInt(0), parser.nextInt(0)); position.setValid(parser.next().equals("A")); position.setLatitude(parser.nextCoordinate()); position.setLongitude(parser.nextCoordinate()); position.setSpeed(parser.nextDouble(0)); position.setCourse(parser.nextDouble(0)); dateBuilder.setDateReverse(parser.nextInt(0), parser.nextInt(0), parser.nextInt(0)); position.setTime(dateBuilder.getDate()); position.set(Position.KEY_INPUT, parser.next()); position.set(Position.KEY_OUTPUT, parser.next()); if (parser.hasNext()) { String[] values = parser.next().split(","); for (int i = 0; i < values.length; i++) { position.set(Position.PREFIX_ADC + (i + 1), Integer.parseInt(values[i], 16)); } } position.set(Position.KEY_ODOMETER, parser.nextInt(0)); position.set(Position.KEY_DRIVER_UNIQUE_ID, parser.next()); if (parser.hasNext()) { int value = parser.nextHexInt(0); position.set(Position.KEY_BATTERY, value >> 8); position.set(Position.KEY_RSSI, (value >> 4) & 0xf); position.set(Position.KEY_SATELLITES, value & 0xf); } return position; } private void requestPhotoFragment(Channel channel) { if (channel != null) { int offset = photo.writerIndex(); int size = Math.min(photo.writableBytes(), MAX_CHUNK_SIZE); channel.writeAndFlush( new NetworkMessage("#PHD" + offset + "," + size + "\r\n", channel.remoteAddress())); } } @Override protected Object decode(Channel channel, SocketAddress remoteAddress, Object msg) throws Exception { ByteBuf buf = (ByteBuf) msg; int typeEndIndex = buf.indexOf(buf.readerIndex(), buf.writerIndex(), (byte) ','); String type = buf.toString(buf.readerIndex(), typeEndIndex - buf.readerIndex(), StandardCharsets.US_ASCII); if (type.startsWith("$PHD")) { int dataIndex = buf.indexOf(typeEndIndex + 1, buf.writerIndex(), (byte) ',') + 1; buf.readerIndex(dataIndex); if (photo != null) { photo.writeBytes(buf.readSlice(buf.readableBytes())); if (photo.writableBytes() > 0) { requestPhotoFragment(channel); } else { DeviceSession deviceSession = getDeviceSession(channel, remoteAddress); String uniqueId = Context.getIdentityManager().getById(deviceSession.getDeviceId()) .getUniqueId(); Position position = new Position(getProtocolName()); position.setDeviceId(deviceSession.getDeviceId()); getLastLocation(position, null); position.set(Position.KEY_IMAGE, Context.getMediaManager().writeFile(uniqueId, photo, "jpg")); photo.release(); photo = null; return position; } } } else { if (type.startsWith("$PHO")) { int size = Integer.parseInt(type.split("-")[0].substring(4)); if (size > 0) { photo = Unpooled.buffer(size); requestPhotoFragment(channel); } } return decodePosition(channel, remoteAddress, buf.toString(StandardCharsets.US_ASCII)); } return null; } }