X-Git-Url: http://gitweb.fperrin.net/?a=blobdiff_plain;f=tim%2Fprune%2Fload%2Fxml%2FGpxHandler.java;fp=tim%2Fprune%2Fload%2Fxml%2FGpxHandler.java;h=962b495741909fb0e46c1fc07c62c254df18a3d1;hb=5625a1abadb5f2ca5f017fe7dbda1d5141cb637b;hp=0000000000000000000000000000000000000000;hpb=23959e65a6a0d581e657b07186d18b7a1ac5afeb;p=GpsPrune.git

diff --git a/tim/prune/load/xml/GpxHandler.java b/tim/prune/load/xml/GpxHandler.java
new file mode 100644
index 0000000..962b495
--- /dev/null
+++ b/tim/prune/load/xml/GpxHandler.java
@@ -0,0 +1,157 @@
+package tim.prune.load.xml;
+
+import java.util.ArrayList;
+
+import org.xml.sax.Attributes;
+import org.xml.sax.SAXException;
+
+import tim.prune.data.Field;
+
+
+/**
+ * Class for handling specifics of parsing Gpx files
+ */
+public class GpxHandler extends XmlHandler
+{
+	private boolean _insideName = false;
+	private boolean _insideElevation = false;
+	private boolean _insideTime = false;
+	private String _name = null, _latitude = null, _longitude = null;
+	private String _elevation = null;
+	private String _time = null;
+	private ArrayList _pointList = new ArrayList();
+
+
+	/**
+	 * 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
+		if (qName.equalsIgnoreCase("wpt") || qName.equalsIgnoreCase("trkpt"))
+		{
+			int numAttributes = attributes.getLength();
+			for (int i=0; i<numAttributes; i++)
+			{
+				String att = attributes.getQName(i);
+				if (att.equals("lat")) {_latitude = attributes.getValue(i);}
+				else if (att.equals("lon")) {_longitude = attributes.getValue(i);}
+			}
+			_elevation = null;
+			_name = null;
+			_time = null;
+		}
+		else if (qName.equalsIgnoreCase("ele"))
+		{
+			_insideElevation = true;
+		}
+		else if (qName.equalsIgnoreCase("name"))
+		{
+			_insideName = true;
+		}
+		else if (qName.equalsIgnoreCase("time"))
+		{
+			_insideTime = true;
+		}
+		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
+	{
+		if (qName.equalsIgnoreCase("wpt") || qName.equalsIgnoreCase("trkpt"))
+		{
+			processPoint();
+		}
+		else if (qName.equalsIgnoreCase("ele"))
+		{
+			_insideElevation = false;
+		}
+		else if (qName.equalsIgnoreCase("name"))
+		{
+			_insideName = false;
+		}
+		else if (qName.equalsIgnoreCase("time"))
+		{
+			_insideTime = false;
+		}
+		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 (_insideName) {_name = checkCharacters(_name, value);}
+		else if (_insideElevation) {_elevation = checkCharacters(_elevation, value);}
+		else if (_insideTime) {_time = checkCharacters(_time, 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[5];
+		values[0] = _latitude; values[1] = _longitude;
+		values[2] = _elevation; values[3] = _name;
+		values[4] = _time;
+		_pointList.add(values);
+	}
+
+
+	/**
+	 * @see tim.prune.load.xml.XmlHandler#getFieldArray()
+	 */
+	public Field[] getFieldArray()
+	{
+		final Field[] fields = {Field.LATITUDE, Field.LONGITUDE, Field.ALTITUDE,
+			Field.WAYPT_NAME, Field.TIMESTAMP};
+		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] = (String[]) _pointList.get(i);
+		}
+		return result;
+	}
+}