X-Git-Url: http://gitweb.fperrin.net/?p=GpsPrune.git;a=blobdiff_plain;f=src%2Ftim%2Fprune%2Fload%2FNmeaFileLoader.java;fp=src%2Ftim%2Fprune%2Fload%2FNmeaFileLoader.java;h=d62ba5fe1660a08a3398004b5b9e44b710f3d1c4;hp=0000000000000000000000000000000000000000;hb=ce6f2161b8596f7018d6a76bff79bc9e571f35fd;hpb=2d8cb72e84d5cc1089ce77baf1e34ea3ea2f8465

diff --git a/src/tim/prune/load/NmeaFileLoader.java b/src/tim/prune/load/NmeaFileLoader.java
new file mode 100644
index 0000000..d62ba5f
--- /dev/null
+++ b/src/tim/prune/load/NmeaFileLoader.java
@@ -0,0 +1,167 @@
+package tim.prune.load;
+
+import java.io.BufferedReader;
+import java.io.File;
+import java.io.FileReader;
+import java.io.IOException;
+import java.util.ArrayList;
+
+import tim.prune.App;
+import tim.prune.data.Field;
+import tim.prune.data.SourceInfo;
+
+/**
+ * Class to handle the loading of Nmea files
+ */
+public class NmeaFileLoader
+{
+	/** App for callback of file loading */
+	private App _app = null;
+
+	/**
+	 * Constructor
+	 * @param inApp App object
+	 */
+	public NmeaFileLoader(App inApp)
+	{
+		_app = inApp;
+	}
+
+	/**
+	 * Open the selected file
+	 * @param inFile File to open
+	 */
+	public void openFile(File inFile)
+	{
+		BufferedReader reader = null;
+		ArrayList<NmeaMessage> messages = new ArrayList<NmeaMessage>();
+		String lastDate = null;
+		try
+		{
+			reader = new BufferedReader(new FileReader(inFile));
+			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 (int m=0; m<messages.size(); m++) {
+									messages.get(m).setDate(date);
+								}
+							}
+							lastDate = date;
+						}
+					}
+				}
+				// Read next line, if any
+				currLine = reader.readLine();
+			}
+		}
+		catch (IOException ioe) {
+			_app.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)
+		{
+			_app.informDataLoaded(getFieldArray(), makeDataArray(messages),
+				null, new SourceInfo(inFile, SourceInfo.FILE_TYPE.NMEA), null);
+		}
+	}
+
+	/**
+	 * 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 static Object[][] makeDataArray(ArrayList<NmeaMessage> inList)
+	{
+		Object[][] result = new Object[inList.size()][];
+		for (int i=0; i<inList.size(); i++) {
+			result[i] = inList.get(i).getStrings();
+		}
+		return result;
+	}
+
+	/**
+	 * @see tim.prune.load.xml.XmlHandler#getFieldArray()
+	 */
+	public Field[] getFieldArray()
+	{
+		final Field[] fields = {Field.LATITUDE, Field.LONGITUDE, Field.ALTITUDE,
+			Field.TIMESTAMP, Field.NEW_SEGMENT};
+		return fields;
+	}
+}