1 package tim.prune.load.xml;
3 import java.util.ArrayList;
5 import org.xml.sax.Attributes;
6 import org.xml.sax.SAXException;
8 import tim.prune.data.Field;
12 * Class for handling specifics of parsing Gpx files
14 public class GpxHandler extends XmlHandler
16 private boolean _insideWaypoint = false;
17 private boolean _insideName = false;
18 private boolean _insideElevation = false;
19 private boolean _insideTime = false;
20 private boolean _startSegment = true;
21 private String _name = null, _latitude = null, _longitude = null;
22 private String _elevation = null;
23 private String _time = null;
24 private ArrayList _pointList = new ArrayList();
28 * Receive the start of a tag
29 * @see org.xml.sax.ContentHandler#startElement(java.lang.String, java.lang.String, java.lang.String, org.xml.sax.Attributes)
31 public void startElement(String uri, String localName, String qName,
32 Attributes attributes) throws SAXException
34 // Read the parameters for waypoints and track points
35 if (qName.equalsIgnoreCase("wpt") || qName.equalsIgnoreCase("trkpt"))
37 _insideWaypoint = qName.equalsIgnoreCase("wpt");
38 int numAttributes = attributes.getLength();
39 for (int i=0; i<numAttributes; i++)
41 String att = attributes.getQName(i);
42 if (att.equals("lat")) {_latitude = attributes.getValue(i);}
43 else if (att.equals("lon")) {_longitude = attributes.getValue(i);}
49 else if (qName.equalsIgnoreCase("ele"))
51 _insideElevation = true;
53 else if (qName.equalsIgnoreCase("name"))
57 else if (qName.equalsIgnoreCase("time"))
61 else if (qName.equalsIgnoreCase("trkseg"))
65 super.startElement(uri, localName, qName, attributes);
71 * @see org.xml.sax.ContentHandler#endElement(java.lang.String, java.lang.String, java.lang.String)
73 public void endElement(String uri, String localName, String qName)
76 if (qName.equalsIgnoreCase("wpt") || qName.equalsIgnoreCase("trkpt"))
80 else if (qName.equalsIgnoreCase("ele"))
82 _insideElevation = false;
84 else if (qName.equalsIgnoreCase("name"))
88 else if (qName.equalsIgnoreCase("time"))
92 super.endElement(uri, localName, qName);
97 * Process character text (inside tags or between them)
98 * @see org.xml.sax.ContentHandler#characters(char[], int, int)
100 public void characters(char[] ch, int start, int length)
103 String value = new String(ch, start, length);
104 if (_insideName && _insideWaypoint) {_name = checkCharacters(_name, value);}
105 else if (_insideElevation) {_elevation = checkCharacters(_elevation, value);}
106 else if (_insideTime) {_time = checkCharacters(_time, value);}
107 super.characters(ch, start, length);
112 * Check to concatenate partially-received values, if necessary
113 * @param inVariable variable containing characters received until now
114 * @param inValue new value received
115 * @return concatenation
117 private static String checkCharacters(String inVariable, String inValue)
119 if (inVariable == null) {return inValue;}
120 return inVariable + inValue;
125 * Process a point, either a waypoint or track point
127 private void processPoint()
129 // Put the values into a String array matching the order in getFieldArray()
130 String[] values = new String[6];
131 values[0] = _latitude; values[1] = _longitude;
132 values[2] = _elevation; values[3] = _name;
134 if (_startSegment && !_insideWaypoint) {
136 _startSegment = false;
138 _pointList.add(values);
143 * @see tim.prune.load.xml.XmlHandler#getFieldArray()
145 public Field[] getFieldArray()
147 final Field[] fields = {Field.LATITUDE, Field.LONGITUDE, Field.ALTITUDE,
148 Field.WAYPT_NAME, Field.TIMESTAMP, Field.NEW_SEGMENT};
154 * Return the parsed information as a 2d array
155 * @see tim.prune.load.xml.XmlHandler#getDataArray()
157 public String[][] getDataArray()
159 int numPoints = _pointList.size();
160 // construct data array
161 String[][] result = new String[numPoints][];
162 for (int i=0; i<numPoints; i++)
164 result[i] = (String[]) _pointList.get(i);