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
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
|
package tim.prune.load;
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import javax.swing.JOptionPane;
import tim.prune.App;
import tim.prune.data.Altitude;
import tim.prune.data.DataPoint;
import tim.prune.data.FileType;
import tim.prune.data.Latitude;
import tim.prune.data.Longitude;
import tim.prune.data.SourceInfo;
import tim.prune.data.UnitSetLibrary;
/**
* Class to handle the loading of Nmea files
*/
public class NmeaFileLoader extends FileTypeLoader
{
/**
* Constructor
* @param inApp App object
*/
public NmeaFileLoader(App inApp) {
super(inApp);
}
/**
* Open the selected file
* @param inFileLock File to open
* @param inAutoAppend true to automatically append
*/
public void openFile(FileToBeLoaded inFileLock, boolean inAutoAppend)
{
BufferedReader reader = null;
ArrayList<NmeaMessage> messages = new ArrayList<NmeaMessage>();
String lastDate = null;
try
{
reader = new BufferedReader(new FileReader(inFileLock.getFile()));
String currLine = reader.readLine();
boolean newSegment = true;
while (currLine != null)
{
// Try to make an NmeaMessage object for each line of file
if (currLine.trim().length() > 0)
{
NmeaMessage message = processGGA(currLine);
if (message != null)
{
if (message.hasFix())
{
message.setSegment(newSegment);
message.setDate(lastDate);
// add message to list
messages.add(message);
}
// Start a new segment if fix lost
newSegment = !message.hasFix();
}
else
{
String date = getDateFromRMC(currLine);
if (date != null)
{
if (lastDate == null && !messages.isEmpty()) {
// Backfill first few messages received before the first date
for (NmeaMessage msg : messages) {
msg.setDate(date);
}
}
lastDate = date;
}
}
}
// Read next line, if any
currLine = reader.readLine();
}
}
catch (IOException ioe) {
getApp().showErrorMessage("error.load.dialogtitle", "error.load.noread");
}
finally
{
// close file ignoring errors
try {
if (reader != null) reader.close();
}
catch (Exception e) {}
}
if (messages.size() > 0)
{
int appendOption = getAppendOption(inAutoAppend);
if (appendOption == JOptionPane.CANCEL_OPTION) {
return;
}
loadData(makePointList(messages), new SourceInfo(inFileLock.getFile(), FileType.NMEA),
appendOption == JOptionPane.YES_OPTION);
}
}
/**
* Process the given GGA sentence and return the message
* @param inLine line to process
* @return message object
*/
private static NmeaMessage processGGA(String inLine)
{
// Only consider lines which are long enough and begin with the GPS position sentence
if (inLine == null || inLine.length() < 20 || !inLine.startsWith("$GPGGA")) {
return null;
}
// Assume comma delimiter, split into array
String[] splitLine = inLine.split(",");
if (splitLine != null && splitLine.length >= 10)
{
return new NmeaMessage(splitLine[2] + splitLine[3], // latitude
splitLine[4] + splitLine[5], // longitude
splitLine[9], // altitude
splitLine[1], // timestamp
splitLine[6]); // fix
}
// Couldn't parse it, return null
return null;
}
/**
* Process the given MRC sentence and return the date
* @param inLine line to process
* @return date, if any
*/
private static String getDateFromRMC(String inLine)
{
// Only consider lines which are long enough and begin with the RMC sentence
if (inLine == null || inLine.length() < 20 || !inLine.startsWith("$GPRMC")) {
return null;
}
// Assume comma delimiter, split into array
String[] splitLine = inLine.split(",");
if (splitLine != null && splitLine.length >= 10)
{
return splitLine[9]; // date in position 9
}
// Couldn't parse it, return null
return null;
}
/**
* Make an object array from the data list
* @param inList list of messages
* @return object array for loading
*/
private List<DataPoint> makePointList(ArrayList<NmeaMessage> inList)
{
ArrayList<DataPoint> points = new ArrayList<>();
for (NmeaMessage nmea : inList)
{
DataPoint point = new DataPoint(Latitude.make(nmea.getLatitude()),
Longitude.make(nmea.getLongitude()),
new Altitude(nmea.getAltitude(), UnitSetLibrary.UNITS_METRES));
point.setSegmentStart(nmea.getSegmentFlag());
points.add(point);
}
return points;
}
}
|
