X-Git-Url: http://gitweb.fperrin.net/?p=GpsPrune.git;a=blobdiff_plain;f=src%2Ftim%2Fprune%2Fload%2Fxml%2FGpxHandler.java;fp=src%2Ftim%2Fprune%2Fload%2Fxml%2FGpxHandler.java;h=6f63080ceb98461a89ada946fda0d9f35b4fc6f4;hp=0000000000000000000000000000000000000000;hb=ce6f2161b8596f7018d6a76bff79bc9e571f35fd;hpb=2d8cb72e84d5cc1089ce77baf1e34ea3ea2f8465

diff --git a/src/tim/prune/load/xml/GpxHandler.java b/src/tim/prune/load/xml/GpxHandler.java
new file mode 100644
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--- /dev/null
+++ b/src/tim/prune/load/xml/GpxHandler.java
@@ -0,0 +1,233 @@
+package tim.prune.load.xml;
+
+import java.util.ArrayList;
+
+import org.xml.sax.Attributes;
+import org.xml.sax.SAXException;
+
+import tim.prune.data.Field;
+import tim.prune.load.TrackNameList;
+
+
+/**
+ * Class for handling specifics of parsing Gpx files
+ */
+public class GpxHandler extends XmlHandler
+{
+	private boolean _insidePoint = false;
+	private boolean _insideWaypoint = false;
+	private boolean _startSegment = true;
+	private boolean _isTrackPoint = false;
+	private int _trackNum = -1;
+	private GpxTag _fileTitle = new GpxTag();
+	private GpxTag _pointName = new GpxTag(), _trackName = new GpxTag();
+	private String _latitude = null, _longitude = null;
+	private GpxTag _elevation = new GpxTag(), _time = new GpxTag();
+	private GpxTag _type = new GpxTag(), _description = new GpxTag();
+	private GpxTag _link = new GpxTag();
+	private GpxTag _currentTag = null;
+	private ArrayList<String[]> _pointList = new ArrayList<String[]>();
+	private ArrayList<String> _linkList = new ArrayList<String>();
+	private TrackNameList _trackNameList = new TrackNameList();
+
+
+	/**
+	 * Receive the start of a tag
+	 * @see org.xml.sax.ContentHandler#startElement(java.lang.String, java.lang.String, java.lang.String, org.xml.sax.Attributes)
+	 */
+	public void startElement(String uri, String localName, String qName,
+		Attributes attributes) throws SAXException
+	{
+		// Read the parameters for waypoints and track points
+		String tag = qName.toLowerCase();
+		if (tag.equals("wpt") || tag.equals("trkpt") || tag.equals("rtept"))
+		{
+			_insidePoint = true;
+			_insideWaypoint = tag.equals("wpt");
+			_isTrackPoint = tag.equals("trkpt");
+			final int numAttributes = attributes.getLength();
+			for (int i=0; i<numAttributes; i++)
+			{
+				String att = attributes.getQName(i).toLowerCase();
+				if (att.equals("lat")) {_latitude = attributes.getValue(i);}
+				else if (att.equals("lon")) {_longitude = attributes.getValue(i);}
+			}
+			_elevation.setValue(null);
+			_pointName.setValue(null);
+			_time.setValue(null);
+			_type.setValue(null);
+			_link.setValue(null);
+			_description.setValue(null);
+		}
+		else if (tag.equals("ele")) {
+			_currentTag = _elevation;
+		}
+		else if (tag.equals("name"))
+		{
+			if (_insidePoint) {
+				_currentTag = _pointName;
+			}
+			else if (_trackNum < 0)
+			{
+				_currentTag = _fileTitle;
+			}
+			else {
+				_currentTag = _trackName;
+			}
+		}
+		else if (tag.equals("time")) {
+			_currentTag = _time;
+		}
+		else if (tag.equals("type")) {
+			_currentTag = _type;
+		}
+		else if (tag.equals("description") || tag.equals("desc")) {
+			_currentTag = _description;
+		}
+		else if (tag.equals("link")) {
+			_link.setValue(attributes.getValue("href"));
+		}
+		else if (tag.equals("trkseg")) {
+			_startSegment = true;
+		}
+		else if (tag.equals("trk"))
+		{
+			_trackNum++;
+			_trackName.setValue(null);
+		}
+		super.startElement(uri, localName, qName, attributes);
+	}
+
+
+	/**
+	 * Process end tag
+	 * @see org.xml.sax.ContentHandler#endElement(java.lang.String, java.lang.String, java.lang.String)
+	 */
+	public void endElement(String uri, String localName, String qName)
+		throws SAXException
+	{
+		String tag = qName.toLowerCase();
+		if (tag.equals("wpt") || tag.equals("trkpt") || tag.equals("rtept"))
+		{
+			processPoint();
+			_insidePoint = false;
+		}
+		else {
+			_currentTag = null;
+		}
+		super.endElement(uri, localName, qName);
+	}
+
+
+	/**
+	 * Process character text (inside tags or between them)
+	 * @see org.xml.sax.ContentHandler#characters(char[], int, int)
+	 */
+	public void characters(char[] ch, int start, int length)
+		throws SAXException
+	{
+		String value = new String(ch, start, length);
+		if (_currentTag != null) {
+			_currentTag.setValue(checkCharacters(_currentTag.getValue(), value));
+		}
+		super.characters(ch, start, length);
+	}
+
+
+	/**
+	 * Check to concatenate partially-received values, if necessary
+	 * @param inVariable variable containing characters received until now
+	 * @param inValue new value received
+	 * @return concatenation
+	 */
+	private static String checkCharacters(String inVariable, String inValue)
+	{
+		if (inVariable == null) {return inValue;}
+		return inVariable + inValue;
+	}
+
+
+	/**
+	 * Process a point, either a waypoint or track point
+	 */
+	private void processPoint()
+	{
+		// Put the values into a String array matching the order in getFieldArray()
+		String[] values = new String[8];
+		values[0] = _latitude;
+		values[1] = _longitude;
+		values[2] = _elevation.getValue();
+		if (_insideWaypoint) {values[3] = _pointName.getValue();}
+		values[4] = _time.getValue();
+		if (_startSegment && !_insideWaypoint)
+		{
+			values[5] = "1";
+			_startSegment = false;
+		}
+		values[6] = _type.getValue();
+		values[7] = _description.getValue();
+		_pointList.add(values);
+		_trackNameList.addPoint(_trackNum, _trackName.getValue(), _isTrackPoint);
+		_linkList.add(_link.getValue());
+	}
+
+
+	/**
+	 * @see tim.prune.load.xml.XmlHandler#getFieldArray()
+	 */
+	public Field[] getFieldArray()
+	{
+		final Field[] fields = {Field.LATITUDE, Field.LONGITUDE, Field.ALTITUDE,
+			Field.WAYPT_NAME, Field.TIMESTAMP, Field.NEW_SEGMENT,
+			Field.WAYPT_TYPE, Field.DESCRIPTION};
+		return fields;
+	}
+
+
+	/**
+	 * Return the parsed information as a 2d array
+	 * @see tim.prune.load.xml.XmlHandler#getDataArray()
+	 */
+	public String[][] getDataArray()
+	{
+		int numPoints = _pointList.size();
+		// construct data array
+		String[][] result = new String[numPoints][];
+		for (int i=0; i<numPoints; i++)
+		{
+			result[i] = _pointList.get(i);
+		}
+		return result;
+	}
+
+	/**
+	 * @return array of links, or null if none
+	 */
+	public String[] getLinkArray()
+	{
+		int numPoints = _linkList.size();
+		boolean hasLink = false;
+		String[] result = new String[numPoints];
+		for (int i=0; i<numPoints; i++)
+		{
+			result[i] = _linkList.get(i);
+			if (result[i] != null) {hasLink = true;}
+		}
+		if (!hasLink) {result = null;}
+		return result;
+	}
+
+	/**
+	 * @return track name list
+	 */
+	public TrackNameList getTrackNameList() {
+		return _trackNameList;
+	}
+
+	/**
+	 * @return file title
+	 */
+	public String getFileTitle() {
+		return _fileTitle.getValue();
+	}
+}