Java tutorial
/* * Copyright 2017 - 2018 Anton Tananaev (anton@traccar.org) * * 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.channel.Channel; import org.traccar.BaseProtocolDecoder; import org.traccar.Context; import org.traccar.DeviceSession; import org.traccar.Protocol; import org.traccar.helper.DataConverter; import org.traccar.helper.UnitsConverter; import org.traccar.model.Position; import java.net.SocketAddress; import java.nio.charset.StandardCharsets; import java.util.Date; import java.util.HashMap; import java.util.Map; import java.util.regex.Matcher; import java.util.regex.Pattern; public class Xt2400ProtocolDecoder extends BaseProtocolDecoder { public Xt2400ProtocolDecoder(Protocol protocol) { super(protocol); String config = Context.getConfig().getString(getProtocolName() + ".config"); if (config != null) { setConfig(config); } } private static final Map<Integer, Integer> TAG_LENGTH_MAP = new HashMap<>(); static { int[] l1 = { 0x01, 0x02, 0x04, 0x0b, 0x0c, 0x0d, 0x12, 0x13, 0x16, 0x17, 0x1c, 0x1f, 0x23, 0x2c, 0x2d, 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x40, 0x41, 0x53, 0x66, 0x69, 0x6a, 0x93, 0x94, 0x96 }; int[] l2 = { 0x05, 0x09, 0x0a, 0x14, 0x15, 0x1d, 0x1e, 0x24, 0x26, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, 0x57, 0x58, 0x59, 0x5a, 0x6b, 0x6f, 0x7A, 0x7B, 0x7C, 0x7d, 0x7E, 0x7F, 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86 }; int[] l4 = { 0x03, 0x06, 0x07, 0x08, 0x0e, 0x0f, 0x10, 0x11, 0x18, 0x19, 0x1a, 0x1b, 0x20, 0x21, 0x22, 0x2e, 0x2f, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, 0x50, 0x51, 0x52, 0x54, 0x55, 0x56, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, 0x60, 0x61, 0x62, 0x68, 0x6e, 0x71, 0x72, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x87, 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d }; for (int i : l1) { TAG_LENGTH_MAP.put(i, 1); } for (int i : l2) { TAG_LENGTH_MAP.put(i, 2); } for (int i : l4) { TAG_LENGTH_MAP.put(i, 4); } TAG_LENGTH_MAP.put(0x95, 24); } private static int getTagLength(int tag) { Integer length = TAG_LENGTH_MAP.get(tag); if (length == null) { throw new IllegalArgumentException("Unknown tag: " + tag); } return length; } private Map<Short, byte[]> formats = new HashMap<>(); public void setConfig(String configString) { Pattern pattern = Pattern.compile(":wycfg pcr\\[\\d+\\] ([0-9a-fA-F]{2})[0-9a-fA-F]{2}([0-9a-fA-F]+)"); Matcher matcher = pattern.matcher(configString); while (matcher.find()) { formats.put(Short.parseShort(matcher.group(1), 16), DataConverter.parseHex(matcher.group(2))); } } @Override protected Object decode(Channel channel, SocketAddress remoteAddress, Object msg) throws Exception { ByteBuf buf = (ByteBuf) msg; byte[] format = null; if (formats.size() > 1) { format = formats.get(buf.getUnsignedByte(buf.readerIndex())); } else if (!formats.isEmpty()) { format = formats.values().iterator().next(); } if (format == null) { return null; } Position position = new Position(getProtocolName()); for (byte tag : format) { switch (tag) { case 0x03: DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, String.valueOf(buf.readUnsignedInt())); if (deviceSession == null) { return null; } position.setDeviceId(deviceSession.getDeviceId()); break; case 0x04: position.set(Position.KEY_EVENT, buf.readUnsignedByte()); break; case 0x05: position.set(Position.KEY_INDEX, buf.readUnsignedShort()); break; case 0x06: position.setTime(new Date(buf.readUnsignedInt() * 1000)); break; case 0x07: position.setLatitude(buf.readInt() * 0.000001); break; case 0x08: position.setLongitude(buf.readInt() * 0.000001); break; case 0x09: position.setAltitude(buf.readShort() * 0.1); break; case 0x0a: position.setCourse(buf.readShort() * 0.1); break; case 0x0b: position.setSpeed(UnitsConverter.knotsFromKph(buf.readUnsignedByte())); break; case 0x10: position.set(Position.KEY_ODOMETER_TRIP, buf.readUnsignedInt()); break; case 0x12: position.set(Position.KEY_HDOP, buf.readUnsignedByte() * 0.1); break; case 0x13: position.set(Position.KEY_SATELLITES, buf.readUnsignedByte()); break; case 0x14: position.set(Position.KEY_RSSI, buf.readShort()); break; case 0x16: position.set(Position.KEY_BATTERY, buf.readUnsignedByte() * 0.1); break; case 0x17: position.set(Position.KEY_POWER, buf.readUnsignedByte() * 0.1); break; case 0x57: position.set(Position.KEY_OBD_SPEED, UnitsConverter.knotsFromKph(buf.readUnsignedShort())); break; case 0x65: position.set(Position.KEY_VIN, buf.readSlice(17).toString(StandardCharsets.US_ASCII)); break; case 0x73: position.set(Position.KEY_VERSION_FW, buf.readSlice(16).toString(StandardCharsets.US_ASCII).trim()); break; default: buf.skipBytes(getTagLength(tag)); break; } } if (position.getLatitude() != 0 && position.getLongitude() != 0) { position.setValid(true); } else { getLastLocation(position, position.getDeviceTime()); } return position; } }