X-Git-Url: http://gitweb.fperrin.net/?p=GpsPrune.git;a=blobdiff_plain;f=src%2Ftim%2Fprune%2Fload%2Fxml%2FKmlHandler.java;fp=src%2Ftim%2Fprune%2Fload%2Fxml%2FKmlHandler.java;h=e8f2c6a463fab9d2d8eda416dacaa8e88fef175c;hp=0000000000000000000000000000000000000000;hb=ce6f2161b8596f7018d6a76bff79bc9e571f35fd;hpb=2d8cb72e84d5cc1089ce77baf1e34ea3ea2f8465

diff --git a/src/tim/prune/load/xml/KmlHandler.java b/src/tim/prune/load/xml/KmlHandler.java
new file mode 100644
index 0000000..e8f2c6a
--- /dev/null
+++ b/src/tim/prune/load/xml/KmlHandler.java
@@ -0,0 +1,302 @@
+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 Kml files
+ */
+public class KmlHandler extends XmlHandler
+{
+	private boolean _insideCoordinates = false;
+	private boolean _insideGxTrack = false;
+	private String _value = null;
+	private String _name = null, _desc = null;
+	private String _timestamp = null, _imgLink = null;
+	private StringBuffer _coordinates = null;
+	private ArrayList<String> _coordinateList = null;
+	private ArrayList<String[]> _pointList = new ArrayList<String[]>();
+	private ArrayList<String> _linkList = new ArrayList<String>();
+	// variables for gx extensions
+	private ArrayList<String> _whenList = new ArrayList<String>();
+	private ArrayList<String> _whereList = new ArrayList<String>();
+
+
+	/**
+	 * 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
+	{
+		String tagName = localName;
+		if (tagName == null || tagName.equals("")) {tagName = qName;}
+		tagName = tagName.toLowerCase();
+
+		if (tagName.equals("placemark"))
+		{
+			_coordinateList = new ArrayList<String>();
+		}
+		else if (tagName.equals("coordinates"))
+		{
+			_insideCoordinates = true;
+			_coordinates = null;
+		}
+		else if (tagName.equals("gx:track"))
+		{
+			_insideGxTrack = true;
+		}
+		_value = 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 tagName = localName;
+		if (tagName == null || tagName.equals("")) {tagName = qName;}
+		tagName = tagName.toLowerCase();
+
+		if (tagName.equals("placemark"))
+		{
+			processPlacemark();
+			_name = _desc = _imgLink = _timestamp = null;
+		}
+		else if (tagName.equals("coordinates"))
+		{
+			_insideCoordinates = false;
+			if (_coordinates != null) _coordinateList.add(_coordinates.toString().trim());
+		}
+		else if (tagName.equals("name"))
+		{
+			_name = _value;
+		}
+		else if (tagName.equals("description"))
+		{
+			_desc = _value;
+			_imgLink = getImgLink(_desc);
+		}
+		else if (tagName.equals("when"))
+		{
+			if (!_insideGxTrack)
+				_timestamp = _value;
+			else
+				_whenList.add(_value);
+		}
+		else if (tagName.equals("gx:coord"))
+		{
+			if (_insideGxTrack) {
+				_whereList.add(_value);
+			}
+		}
+		else if (tagName.equals("gx:track"))
+		{
+			processGxTrack();
+			_insideGxTrack = 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 val = new String(ch, start, length);
+		if (_insideCoordinates)
+		{
+			if (_coordinates == null) {
+				_coordinates = new StringBuffer();
+			}
+			_coordinates.append(val);
+		}
+		else
+		{
+			// Store string in _value
+			if (_value == null) _value = val;
+			else _value = _value + val;
+		}
+		super.characters(ch, start, length);
+	}
+
+
+	/**
+	 * Process a placemark entry, either a single waypoint or a whole track
+	 */
+	private void processPlacemark()
+	{
+		if (_coordinateList == null || _coordinateList.isEmpty()) return;
+		final boolean isSingleSelection = (_coordinateList.size() == 1);
+		// Loop over coordinate sets in list (may have multiple <coordinates> tags within single placemark)
+		for (String coords : _coordinateList)
+		{
+			String[] coordArray = coords.split("[ \n]");
+			int numPoints = coordArray.length;
+			if (numPoints == 1)
+			{
+				// Add single point to list
+				final String name = (isSingleSelection ? _name : null);
+				_pointList.add(makeStringArray(coords, name, _desc, _timestamp));
+				_linkList.add(_imgLink);
+			}
+			else if (numPoints > 1)
+			{
+				// Add each of the unnamed track points to list
+				boolean firstPoint = true;
+				for (int p=0; p<numPoints; p++)
+				{
+					if (coordArray[p] != null && coordArray[p].trim().length()>3)
+					{
+						String[] pointArray = makeStringArray(coordArray[p], null, null, null);
+						if (firstPoint) {pointArray[5] = "1";} // start of segment flag
+						firstPoint = false;
+						_pointList.add(pointArray);
+					}
+					_linkList.add(null);
+				}
+			}
+		}
+	}
+
+	/**
+	 * Process a Gx track including timestamps
+	 */
+	private void processGxTrack()
+	{
+		if (!_whereList.isEmpty())
+		{
+			// If the whens don't match, then throw them all away
+			if (_whenList.size() != _whereList.size()) {System.out.println("clearing!"); _whenList.clear();}
+
+			// Add each of the unnamed track points to list
+			boolean firstPoint = true;
+			final int numPoints = _whenList.size();
+			for (int p=0; p < numPoints; p++)
+			{
+				String when  = (_whenList.isEmpty() ? null : _whenList.get(p));
+				String where = _whereList.get(p);
+				if (where != null)
+				{
+					String[] coords = where.split(" ");
+					if (coords.length == 3)
+					{
+						String[] pointArray = new String[7];
+						pointArray[0] = coords[0];
+						pointArray[1] = coords[1];
+						pointArray[2] = coords[2];
+						// leave name and description empty
+						if (firstPoint) {pointArray[5] = "1";} // start of segment flag
+						firstPoint = false;
+						pointArray[6] = when; // timestamp
+						_pointList.add(pointArray);
+					}
+				}
+				_linkList.add(null);
+			}
+		}
+		_whenList.clear();
+		_whereList.clear();
+	}
+
+	/**
+	 * Extract an image link from the point description
+	 * @param inDesc description tag contents
+	 * @return image link if found or null
+	 */
+	private static String getImgLink(String inDesc)
+	{
+		if (inDesc == null || inDesc.equals("")) {return null;}
+		// Pull out <img tag from description (if any)
+		int spos = inDesc.indexOf("<img");
+		int epos = inDesc.indexOf('>', spos + 10);
+		if (spos < 0 || epos < 0) return null;
+		String imgtag = inDesc.substring(spos + 4, epos);
+		// Find the src attribute from img tag
+		int quotepos = imgtag.toLowerCase().indexOf("src=");
+		if (quotepos < 0) return null;
+		// source may be quoted with single or double quotes
+		char quotechar = imgtag.charAt(quotepos + 4);
+		int equotepos = imgtag.indexOf(quotechar, quotepos + 7);
+		if (equotepos < 0) return null;
+		return imgtag.substring(quotepos + 5, equotepos);
+	}
+
+	/**
+	 * Construct the String array for the given coordinates and name
+	 * @param inCoordinates coordinate string in Kml format
+	 * @param inName name of waypoint, or null if track point
+	 * @param inDesc description of waypoint, if any
+	 * @param inDesc timestamp of waypoint, if any
+	 * @return String array for point
+	 */
+	private static String[] makeStringArray(String inCoordinates,
+		String inName, String inDesc, String inTimestamp)
+	{
+		String[] result = new String[7];
+		String[] values = inCoordinates.split(",");
+		final int numValues = values.length;
+		if (numValues == 3 || numValues == 2) {
+			System.arraycopy(values, 0, result, 0, numValues);
+		}
+		result[3] = inName;
+		result[4] = inDesc;
+		result[6] = inTimestamp;
+		return result;
+	}
+
+
+	/**
+	 * @see tim.prune.load.xml.XmlHandler#getFieldArray()
+	 */
+	public Field[] getFieldArray()
+	{
+		final Field[] fields = {Field.LONGITUDE, Field.LATITUDE, Field.ALTITUDE,
+			Field.WAYPT_NAME, Field.DESCRIPTION, Field.NEW_SEGMENT, 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] = _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;
+	}
+}