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;
9 import tim.prune.load.TrackNameList;
13 * Class for handling specifics of parsing Gpx files
15 public class GpxHandler extends XmlHandler
17 private boolean _insidePoint = false;
18 private boolean _insideWaypoint = false;
19 private boolean _startSegment = true;
20 private boolean _isTrackPoint = false;
21 private int _trackNum = -1;
22 private GpxTag _name = new GpxTag(), _trackName = new GpxTag();
23 private String _latitude = null, _longitude = null;
24 private GpxTag _elevation = new GpxTag(), _time = new GpxTag();
25 private GpxTag _type = new GpxTag(), _link = new GpxTag();
26 private GpxTag _currentTag = null;
27 private ArrayList<String[]> _pointList = new ArrayList<String[]>();
28 private ArrayList<String> _linkList = new ArrayList<String>();
29 private TrackNameList _trackNameList = new TrackNameList();
33 * Receive the start of a tag
34 * @see org.xml.sax.ContentHandler#startElement(java.lang.String, java.lang.String, java.lang.String, org.xml.sax.Attributes)
36 public void startElement(String uri, String localName, String qName,
37 Attributes attributes) throws SAXException
39 // Read the parameters for waypoints and track points
40 String tag = qName.toLowerCase();
41 if (tag.equals("wpt") || tag.equals("trkpt") || tag.equals("rtept"))
44 _insideWaypoint = tag.equals("wpt");
45 _isTrackPoint = tag.equals("trkpt");
46 final int numAttributes = attributes.getLength();
47 for (int i=0; i<numAttributes; i++)
49 String att = attributes.getQName(i).toLowerCase();
50 if (att.equals("lat")) {_latitude = attributes.getValue(i);}
51 else if (att.equals("lon")) {_longitude = attributes.getValue(i);}
53 _elevation.setValue(null);
59 else if (tag.equals("ele")) {
60 _currentTag = _elevation;
62 else if (tag.equals("name")) {
63 _currentTag = (_insidePoint?_name:_trackName);
65 else if (tag.equals("time")) {
68 else if (tag.equals("type")) {
71 else if (tag.equals("link")) {
72 _link.setValue(attributes.getValue("href"));
74 else if (tag.equals("trkseg")) {
77 else if (tag.equals("trk"))
80 _trackName.setValue(null);
82 super.startElement(uri, localName, qName, attributes);
88 * @see org.xml.sax.ContentHandler#endElement(java.lang.String, java.lang.String, java.lang.String)
90 public void endElement(String uri, String localName, String qName)
93 String tag = qName.toLowerCase();
94 if (tag.equals("wpt") || tag.equals("trkpt") || tag.equals("rtept"))
102 super.endElement(uri, localName, qName);
107 * Process character text (inside tags or between them)
108 * @see org.xml.sax.ContentHandler#characters(char[], int, int)
110 public void characters(char[] ch, int start, int length)
113 String value = new String(ch, start, length);
114 if (_currentTag != null) {
115 _currentTag.setValue(checkCharacters(_currentTag.getValue(), value));
117 super.characters(ch, start, length);
122 * Check to concatenate partially-received values, if necessary
123 * @param inVariable variable containing characters received until now
124 * @param inValue new value received
125 * @return concatenation
127 private static String checkCharacters(String inVariable, String inValue)
129 if (inVariable == null) {return inValue;}
130 return inVariable + inValue;
135 * Process a point, either a waypoint or track point
137 private void processPoint()
139 // Put the values into a String array matching the order in getFieldArray()
140 String[] values = new String[7];
141 values[0] = _latitude;
142 values[1] = _longitude;
143 values[2] = _elevation.getValue();
144 if (_insideWaypoint) {values[3] = _name.getValue();}
145 values[4] = _time.getValue();
146 if (_startSegment && !_insideWaypoint) {
148 _startSegment = false;
150 values[6] = _type.getValue();
151 _pointList.add(values);
152 _trackNameList.addPoint(_trackNum, _trackName.getValue(), _isTrackPoint);
153 _linkList.add(_link.getValue());
158 * @see tim.prune.load.xml.XmlHandler#getFieldArray()
160 public Field[] getFieldArray()
162 final Field[] fields = {Field.LATITUDE, Field.LONGITUDE, Field.ALTITUDE,
163 Field.WAYPT_NAME, Field.TIMESTAMP, Field.NEW_SEGMENT, Field.WAYPT_TYPE};
169 * Return the parsed information as a 2d array
170 * @see tim.prune.load.xml.XmlHandler#getDataArray()
172 public String[][] getDataArray()
174 int numPoints = _pointList.size();
175 // construct data array
176 String[][] result = new String[numPoints][];
177 for (int i=0; i<numPoints; i++)
179 result[i] = _pointList.get(i);
185 * @return array of links, or null if none
187 public String[] getLinkArray()
189 int numPoints = _linkList.size();
190 boolean hasLink = false;
191 String[] result = new String[numPoints];
192 for (int i=0; i<numPoints; i++)
194 result[i] = _linkList.get(i);
195 if (result[i] != null) {hasLink = true;}
197 if (!hasLink) {result = null;}
202 * @return track name list
204 public TrackNameList getTrackNameList() {
205 return _trackNameList;