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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 _insidePlacemark = false;
private boolean _insideName = false;
private boolean _insideCoordinates = false;
private String _name = null;
private StringBuffer _coordinates = null;
private ArrayList<String[]> _pointList = 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;}
if (tagName.equalsIgnoreCase("Placemark")) _insidePlacemark = true;
else if (tagName.equalsIgnoreCase("coordinates")) {_insideCoordinates = true; _coordinates = null;}
else if (tagName.equalsIgnoreCase("name")) {_insideName = true; _name = 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;}
if (tagName.equalsIgnoreCase("Placemark"))
{
processPlacemark();
_insidePlacemark = false;
}
else if (tagName.equalsIgnoreCase("coordinates")) _insideCoordinates = false;
else if (tagName.equalsIgnoreCase("name")) _insideName = 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
{
if (_insidePlacemark && (_insideName || _insideCoordinates))
{
String value = new String(ch, start, length);
if (_insideName) {_name = value;}
else if (_insideCoordinates)
{
if (_coordinates == null)
{
_coordinates = new StringBuffer();
}
_coordinates.append(value);
}
}
super.characters(ch, start, length);
}
/**
* Process a placemark entry, either a single waypoint or a whole track
*/
private void processPlacemark()
{
if (_coordinates == null) return;
String allCoords = _coordinates.toString().trim();
String[] coordArray = allCoords.split("[ \n]");
int numPoints = coordArray.length;
if (numPoints == 1)
{
// Add single waypoint to list
_pointList.add(makeStringArray(allCoords, _name));
}
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);
if (firstPoint) {pointArray[4] = "1";} // start of segment flag
firstPoint = false;
_pointList.add(pointArray);
}
}
}
}
/**
* 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
* @return String array for point
*/
private static String[] makeStringArray(String inCoordinates, String inName)
{
String[] result = new String[5];
String[] values = inCoordinates.split(",");
if (values.length == 3) {System.arraycopy(values, 0, result, 0, 3);}
result[3] = inName;
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.NEW_SEGMENT};
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;
}
}
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