tim/prune/function/GetWikipediaXmlHandler.java

   1 package tim.prune.function;
   2
   3 import java.util.ArrayList;
   4
   5 import org.xml.sax.Attributes;
   6 import org.xml.sax.SAXException;
   7 import org.xml.sax.helpers.DefaultHandler;
   8
   9 import tim.prune.function.gpsies.GpsiesTrack;
  10
  11 /**
  12  * XML handler for dealing with XML returned from gpsies.com
  13  */
  14 public class GetWikipediaXmlHandler extends DefaultHandler
  15 {
  16         private String _value = null;
  17         private ArrayList<GpsiesTrack> _trackList = null;
  18         private GpsiesTrack _track = null;
  19         private String _lat = null, _lon = null;
  20
  21
  22         /**
  23          * React to the start of an XML tag
  24          */
  25         public void startElement(String inUri, String inLocalName, String inTagName,
  26                 Attributes inAttributes) throws SAXException
  27         {
  28                 if (inTagName.equals("geonames")) {
  29                         _trackList = new ArrayList<GpsiesTrack>();
  30                 }
  31                 else if (inTagName.equals("entry")) {
  32                         _track = new GpsiesTrack();
  33                         _lat = null;
  34                         _lon = null;
  35                 }
  36                 else _value = null;
  37                 super.startElement(inUri, inLocalName, inTagName, inAttributes);
  38         }
  39
  40         /**
  41          * React to the end of an XML tag
  42          */
  43         public void endElement(String inUri, String inLocalName, String inTagName)
  44         throws SAXException
  45         {
  46                 if (inTagName.equals("entry")) {
  47                         // end of the entry
  48                         _track.setDownloadLink(_lat + "," + _lon);
  49                         _trackList.add(_track);
  50                 }
  51                 else if (inTagName.equals("title")) {
  52                         _track.setTrackName(_value);
  53                 }
  54                 else if (inTagName.equals("summary")) {
  55                         _track.setDescription(_value);
  56                 }
  57                 else if (inTagName.equals("lat")) {
  58                         _lat = _value;
  59                 }
  60                 else if (inTagName.equals("lng")) {
  61                         _lon = _value;
  62                 }
  63                 else if (inTagName.equals("distance")) {
  64                         try {
  65                                 _track.setLength(Double.parseDouble(_value) * 1000.0); // convert from km to m
  66                         }
  67                         catch (NumberFormatException nfe) {}
  68                 }
  69                 else if (inTagName.equals("wikipediaUrl")) {
  70                         _track.setWebUrl(_value);
  71                 }
  72                 super.endElement(inUri, inLocalName, inTagName);
  73         }
  74
  75         /**
  76          * React to characters received inside tags
  77          */
  78         public void characters(char[] inCh, int inStart, int inLength)
  79         throws SAXException
  80         {
  81                 String value = new String(inCh, inStart, inLength);
  82                 _value = (_value==null?value:_value+value);
  83                 super.characters(inCh, inStart, inLength);
  84         }
  85
  86         /**
  87          * @return the list of tracks
  88          */
  89         public ArrayList<GpsiesTrack> getTrackList()
  90         {
  91                 return _trackList;
  92         }
  93 }