Java tutorial
/* * Copyright 2016 - 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.buffer.Unpooled; import io.netty.channel.Channel; import org.traccar.StringProtocolEncoder; import org.traccar.helper.DataConverter; import org.traccar.model.Command; import java.nio.charset.StandardCharsets; import java.text.DecimalFormat; import java.text.DecimalFormatSymbols; import java.util.HashMap; import java.util.Locale; import java.util.Map; import java.util.TimeZone; public class WatchProtocolEncoder extends StringProtocolEncoder implements StringProtocolEncoder.ValueFormatter { @Override public String formatValue(String key, Object value) { if (key.equals(Command.KEY_TIMEZONE)) { double offset = TimeZone.getTimeZone((String) value).getRawOffset() / 3600000.0; DecimalFormat fmt = new DecimalFormat("+#.##;-#.##", DecimalFormatSymbols.getInstance(Locale.US)); return fmt.format(offset); } else if (key.equals(Command.KEY_MESSAGE)) { return DataConverter.printHex(value.toString().getBytes(StandardCharsets.UTF_16BE)); } else if (key.equals(Command.KEY_ENABLE)) { return (boolean) value ? "1" : "0"; } return null; } protected ByteBuf formatTextCommand(Channel channel, Command command, String format, String... keys) { String content = formatCommand(command, format, this, keys); ByteBuf buf = Unpooled.copiedBuffer(content, StandardCharsets.US_ASCII); return formatBinaryCommand(channel, command, "", buf); } protected ByteBuf formatBinaryCommand(Channel channel, Command command, String textPrefix, ByteBuf data) { boolean hasIndex = false; String manufacturer = "CS"; if (channel != null) { WatchProtocolDecoder decoder = channel.pipeline().get(WatchProtocolDecoder.class); if (decoder != null) { hasIndex = decoder.getHasIndex(); manufacturer = decoder.getManufacturer(); } } ByteBuf buf = Unpooled.buffer(); buf.writeByte('['); buf.writeCharSequence(manufacturer, StandardCharsets.US_ASCII); buf.writeByte('*'); buf.writeCharSequence(getUniqueId(command.getDeviceId()), StandardCharsets.US_ASCII); buf.writeByte('*'); if (hasIndex) { buf.writeCharSequence("0001", StandardCharsets.US_ASCII); buf.writeByte('*'); } buf.writeCharSequence(String.format("%04x", data.readableBytes() + textPrefix.length()), StandardCharsets.US_ASCII); buf.writeByte('*'); buf.writeCharSequence(textPrefix, StandardCharsets.US_ASCII); buf.writeBytes(data); buf.writeByte(']'); return buf; } private static Map<Byte, Byte> mapping = new HashMap<>(); static { mapping.put((byte) 0x7d, (byte) 0x01); mapping.put((byte) 0x5B, (byte) 0x02); mapping.put((byte) 0x5D, (byte) 0x03); mapping.put((byte) 0x2C, (byte) 0x04); mapping.put((byte) 0x2A, (byte) 0x05); } private ByteBuf getBinaryData(Command command) { byte[] data = DataConverter.parseHex(command.getString(Command.KEY_DATA)); int encodedLength = data.length; for (byte b : data) { if (mapping.containsKey(b)) { encodedLength += 1; } } int index = 0; byte[] encodedData = new byte[encodedLength]; for (byte b : data) { Byte replacement = mapping.get(b); if (replacement != null) { encodedData[index] = 0x7D; index += 1; encodedData[index] = replacement; } else { encodedData[index] = b; } index += 1; } return Unpooled.copiedBuffer(encodedData); } @Override protected Object encodeCommand(Channel channel, Command command) { switch (command.getType()) { case Command.TYPE_CUSTOM: return formatTextCommand(channel, command, command.getString(Command.KEY_DATA)); case Command.TYPE_POSITION_SINGLE: return formatTextCommand(channel, command, "RG"); case Command.TYPE_SOS_NUMBER: return formatTextCommand(channel, command, "SOS{%s},{%s}", Command.KEY_INDEX, Command.KEY_PHONE); case Command.TYPE_ALARM_SOS: return formatTextCommand(channel, command, "SOSSMS,{%s}", Command.KEY_ENABLE); case Command.TYPE_ALARM_BATTERY: return formatTextCommand(channel, command, "LOWBAT,{%s}", Command.KEY_ENABLE); case Command.TYPE_REBOOT_DEVICE: return formatTextCommand(channel, command, "RESET"); case Command.TYPE_POWER_OFF: return formatTextCommand(channel, command, "POWEROFF"); case Command.TYPE_ALARM_REMOVE: return formatTextCommand(channel, command, "REMOVE,{%s}", Command.KEY_ENABLE); case Command.TYPE_SILENCE_TIME: return formatTextCommand(channel, command, "SILENCETIME,{%s}", Command.KEY_DATA); case Command.TYPE_ALARM_CLOCK: return formatTextCommand(channel, command, "REMIND,{%s}", Command.KEY_DATA); case Command.TYPE_SET_PHONEBOOK: return formatTextCommand(channel, command, "PHB,{%s}", Command.KEY_DATA); case Command.TYPE_MESSAGE: return formatTextCommand(channel, command, "MESSAGE,{%s}", Command.KEY_MESSAGE); case Command.TYPE_VOICE_MESSAGE: return formatBinaryCommand(channel, command, "TK,", getBinaryData(command)); case Command.TYPE_POSITION_PERIODIC: return formatTextCommand(channel, command, "UPLOAD,{%s}", Command.KEY_FREQUENCY); case Command.TYPE_SET_TIMEZONE: return formatTextCommand(channel, command, "LZ,,{%s}", Command.KEY_TIMEZONE); case Command.TYPE_SET_INDICATOR: return formatTextCommand(channel, command, "FLOWER,{%s}", Command.KEY_DATA); default: return null; } } }