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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 Gpx files
*/
public class GpxHandler extends XmlHandler
{
private boolean _insideWaypoint = false;
private boolean _insideName = false;
private boolean _insideElevation = false;
private boolean _insideTime = false;
private boolean _insideType = false;
private boolean _startSegment = true;
private String _name = null, _latitude = null, _longitude = null;
private String _elevation = null;
private String _time = null;
private String _type = 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
{
// Read the parameters for waypoints and track points
if (qName.equalsIgnoreCase("wpt") || qName.equalsIgnoreCase("trkpt") || qName.equalsIgnoreCase("rtept"))
{
_insideWaypoint = qName.equalsIgnoreCase("wpt");
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;
_type = null;
}
else if (qName.equalsIgnoreCase("ele"))
{
_insideElevation = true;
}
else if (qName.equalsIgnoreCase("name"))
{
_insideName = true;
}
else if (qName.equalsIgnoreCase("time"))
{
_insideTime = true;
}
else if (qName.equalsIgnoreCase("type"))
{
_insideType = true;
}
else if (qName.equalsIgnoreCase("trkseg"))
{
_startSegment = 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") || qName.equalsIgnoreCase("rtept"))
{
processPoint();
}
else if (qName.equalsIgnoreCase("ele"))
{
_insideElevation = false;
}
else if (qName.equalsIgnoreCase("name"))
{
_insideName = false;
}
else if (qName.equalsIgnoreCase("time"))
{
_insideTime = false;
}
else if (qName.equalsIgnoreCase("type"))
{
_insideType = 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 && _insideWaypoint) {_name = checkCharacters(_name, value);}
else if (_insideElevation) {_elevation = checkCharacters(_elevation, value);}
else if (_insideTime) {_time = checkCharacters(_time, value);}
else if (_insideType) {_type = checkCharacters(_type, 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[7];
values[0] = _latitude; values[1] = _longitude;
values[2] = _elevation; values[3] = _name;
values[4] = _time;
if (_startSegment && !_insideWaypoint) {
values[5] = "1";
_startSegment = false;
}
values[6] = _type;
_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, Field.NEW_SEGMENT, Field.WAYPT_TYPE};
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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