aboutsummaryrefslogtreecommitdiff
path: root/src/org/traccar/protocol/Tr20ProtocolDecoder.java
blob: d097ee3fe2cdb5fb036af07b02b0f95443e2ee36 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
/*
 * Copyright 2012 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.Calendar;
import java.util.TimeZone;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.jboss.netty.channel.Channel;

import org.traccar.BaseProtocolDecoder;
import org.traccar.helper.UnitsConverter;
import org.traccar.model.Position;

public class Tr20ProtocolDecoder extends BaseProtocolDecoder {

    public Tr20ProtocolDecoder(Tr20Protocol protocol) {
        super(protocol);
    }

    private static final Pattern patternPing = Pattern.compile(
            "%%[^,]+,(\\d+)");

    private static final Pattern patternData = Pattern.compile(
            "%%" +
            "([^,]+)," +                   // Id
            "([AL])," +                    // Validity
            "(\\d{2})(\\d{2})(\\d{2})" +   // Date (YYMMDD)
            "(\\d{2})(\\d{2})(\\d{2})," +  // Time (HHMMSS)
            "([NS])" +
            "(\\d{2})(\\d{2}\\.\\d+)" +    // Latitude (DDMM.MMMM)
            "([EW])" +
            "(\\d{3})(\\d{2}\\.\\d+)," +   // Longitude (DDDMM.MMMM)
            "(\\d+)," +                    // Speed
            "(\\d+)," +                    // Course
            ".*");

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

        String sentence = (String) msg;

        // Keep alive message
        Matcher parser = patternPing.matcher(sentence);
        if (parser.matches()) {

            // Send response
            if (channel != null) {
                channel.write("&&" + parser.group(1) + "\r\n");
            }
        } else {

            // Data message parse
            parser = patternData.matcher(sentence);

            // Unknown message
            if (!parser.matches()) {
                return null;
            }

            // Create new position
            Position position = new Position();
            position.setProtocol(getProtocolName());

            Integer index = 1;

            // Get device by id
            if (!identify(parser.group(index++), channel)) {
                return null;
            }
            position.setDeviceId(getDeviceId());

            // Validity
            position.setValid(parser.group(index++).compareTo("A") == 0);

            // Time
            Calendar time = Calendar.getInstance(TimeZone.getTimeZone("UTC"));
            time.clear();
            time.set(Calendar.YEAR, 2000 + Integer.parseInt(parser.group(index++)));
            time.set(Calendar.MONTH, Integer.parseInt(parser.group(index++)) - 1);
            time.set(Calendar.DAY_OF_MONTH, Integer.parseInt(parser.group(index++)));
            time.set(Calendar.HOUR_OF_DAY, Integer.parseInt(parser.group(index++)));
            time.set(Calendar.MINUTE, Integer.parseInt(parser.group(index++)));
            time.set(Calendar.SECOND, Integer.parseInt(parser.group(index++)));
            position.setTime(time.getTime());

            // Latitude
            int hemisphere = 1;
            if (parser.group(index++).compareTo("S") == 0) hemisphere = -1;
            Double latitude = Double.parseDouble(parser.group(index++));
            latitude += Double.parseDouble(parser.group(index++)) / 60;
            position.setLatitude(latitude * hemisphere);

            // Longitude
            hemisphere = 1;
            if (parser.group(index++).compareTo("W") == 0) hemisphere = -1;
            Double longitude = Double.parseDouble(parser.group(index++));
            longitude += Double.parseDouble(parser.group(index++)) / 60;
            position.setLongitude(longitude * hemisphere);

            // Speed
            position.setSpeed(UnitsConverter.knotsFromKph(Double.parseDouble(parser.group(index++))));

            // Course
            position.setCourse(Double.parseDouble(parser.group(index++)));

            return position;
        }

        return null;
    }

}