src/tim/prune/function/SearchOsmPoisXmlHandler.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.search.SearchResult;
  10
  11 /**
  12  * XML handler for dealing with XML returned from the OSM Overpass api,
  13  * specially for the OSM Poi service
  14  */
  15 public class SearchOsmPoisXmlHandler extends DefaultHandler
  16 {
  17         private ArrayList<SearchResult> _pointList = null;
  18         private SearchResult _currPoint = null;
  19         private String _errorMessage = 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("osm")) {
  29                         _pointList = new ArrayList<SearchResult>();
  30                 }
  31                 else if (inTagName.equals("node"))
  32                 {
  33                         _currPoint = new SearchResult();
  34                         _currPoint.setLatitude(inAttributes.getValue("lat"));
  35                         _currPoint.setLongitude(inAttributes.getValue("lon"));
  36                 }
  37                 else if (inTagName.equals("tag") && _currPoint != null) {
  38                         processTag(inAttributes);
  39                 }
  40                 super.startElement(inUri, inLocalName, inTagName, inAttributes);
  41         }
  42
  43         /**
  44          * @param inAttributes attributes to process
  45          */
  46         private void processTag(Attributes inAttributes)
  47         {
  48                 String key = inAttributes.getValue("k");
  49                 if (key != null)
  50                 {
  51                         String value = inAttributes.getValue("v");
  52                         if (key.equals("name"))
  53                         {
  54                                 _currPoint.setTrackName(value);
  55                         }
  56                         else if (key.equals("amenity") || key.equals("highway") || key.equals("railway"))
  57                         {
  58                                 _currPoint.setPointType(value);
  59                         }
  60                 }
  61         }
  62
  63         /**
  64          * React to the end of an XML tag
  65          */
  66         public void endElement(String inUri, String inLocalName, String inTagName)
  67         throws SAXException
  68         {
  69                 if (inTagName.equals("node"))
  70                 {
  71                         // end of the entry
  72                         if (_currPoint.getTrackName() != null && !_currPoint.getTrackName().equals(""))
  73                         _pointList.add(_currPoint);
  74                 }
  75                 super.endElement(inUri, inLocalName, inTagName);
  76         }
  77
  78         /**
  79          * @return the list of points
  80          */
  81         public ArrayList<SearchResult> getPointList()
  82         {
  83                 return _pointList;
  84         }
  85
  86         /**
  87          * @return error message, if any
  88          */
  89         public String getErrorMessage() {
  90                 return _errorMessage;
  91         }
  92 }