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path: root/src/org/traccar/protocol/GpsGateProtocolDecoder.java
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/*
 * Copyright 2013 - 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.regex.Pattern;
import org.jboss.netty.channel.Channel;
import org.traccar.BaseProtocolDecoder;
import org.traccar.helper.Checksum;
import org.traccar.helper.DateBuilder;
import org.traccar.helper.Parser;
import org.traccar.helper.PatternBuilder;
import org.traccar.model.Position;

public class GpsGateProtocolDecoder extends BaseProtocolDecoder {

    public GpsGateProtocolDecoder(GpsGateProtocol protocol) {
        super(protocol);
    }

    private static final Pattern PATTERN = new PatternBuilder()
            .text("$GPRMC,")
            .number("(dd)(dd)(dd).?(d+)?,") // Time (HHMMSS.SSS)
            .expression("([AV]),")                    // Validity
            .number("(dd)(dd.d+),")   // Latitude (DDMM.MMMM)
            .expression("([NS]),")
            .number("(ddd)(dd.d+),")   // Longitude (DDDMM.MMMM)
            .expression("([EW]),")
            .number("(d+.d+)?,")            // Speed
            .number("(d+.d+)?,")            // Course
            .number("(dd)(dd)(dd)")   // Date (DDMMYY)
            .any()                         // Other (Checksumm)
            .compile();

    private void send(Channel channel, String message) {
        if (channel != null) {
            channel.write(message + Checksum.nmea(message) + "\r\n");
        }
    }

    @Override
    protected Object decode(
            Channel channel, SocketAddress remoteAddress, Object msg)
            throws Exception {

        String sentence = (String) msg;

        if (sentence.startsWith("$FRLIN,")) {

            // Login
            int beginIndex = sentence.indexOf(',', 7);
            if (beginIndex != -1) {
                beginIndex += 1;
                int endIndex = sentence.indexOf(',', beginIndex);
                if (endIndex != -1) {
                    String imei = sentence.substring(beginIndex, endIndex);
                    if (identify(imei, channel)) {
                        if (channel != null) {
                            send(channel, "$FRSES," + channel.getId());
                        }
                    } else {
                        send(channel, "$FRERR,AuthError,Unknown device");
                    }
                } else {
                    send(channel, "$FRERR,AuthError,Parse error");
                }
            } else {
                send(channel, "$FRERR,AuthError,Parse error");
            }

        } else if (sentence.startsWith("$FRVER,")) {

            // Version check
            send(channel, "$FRVER,1,0,GpsGate Server 1.0");

        } else if (sentence.startsWith("$GPRMC,") && hasDeviceId()) {

            Parser parser = new Parser(PATTERN, sentence);
            if (!parser.matches()) {
                return null;
            }

            Position position = new Position();
            position.setProtocol(getProtocolName());
            position.setDeviceId(getDeviceId());

            DateBuilder dateBuilder = new DateBuilder()
                    .setTime(parser.nextInt(), parser.nextInt(), parser.nextInt(), parser.nextInt());

            position.setValid(parser.next().equals("A"));
            position.setLatitude(parser.nextCoordinate());
            position.setLongitude(parser.nextCoordinate());
            position.setSpeed(parser.nextDouble());
            position.setCourse(parser.nextDouble());

            dateBuilder.setDateReverse(parser.nextInt(), parser.nextInt(), parser.nextInt());
            position.setTime(dateBuilder.getDate());

            return position;
        }

        return null;
    }

}