content: package tim.prune.function.search;
  
  import java.util.ArrayList;
  
  import org.xml.sax.Attributes;
  import org.xml.sax.SAXException;
  import org.xml.sax.helpers.DefaultHandler;
  
  /**
   * XML handler for dealing with XML returned from the OSM Overpass api,
   * specially for the OSM Poi service
   */
  public class SearchOsmPoisXmlHandler extends DefaultHandler
  {
  	private ArrayList<SearchResult> _pointList = null;
  	private SearchResult _currPoint = null;
  
  
  	/**
  	 * React to the start of an XML tag
  	 */
  	public void startElement(String inUri, String inLocalName, String inTagName,
  		Attributes inAttributes) throws SAXException
  	{
  		if (inTagName.equals("osm")) {
  			_pointList = new ArrayList<>();
  		}
  		else if (inTagName.equals("node"))
  		{
  			_currPoint = new SearchResult();
  			_currPoint.setLatitude(inAttributes.getValue("lat"));
  			_currPoint.setLongitude(inAttributes.getValue("lon"));
  		}
  		else if (inTagName.equals("tag") && _currPoint != null) {
  			processTag(inAttributes);
  		}
  		super.startElement(inUri, inLocalName, inTagName, inAttributes);
  	}
  
  	/**
  	 * @param inAttributes attributes to process
  	 */
  	private void processTag(Attributes inAttributes)
  	{
  		String key = inAttributes.getValue("k");
  		if (key != null)
  		{
  			String value = inAttributes.getValue("v");
  			if (key.equals("name")) {
  				_currPoint.setTrackName(value);
  			}
  			else if (key.equals("amenity") || key.equals("highway") || key.equals("railway")) {
  				_currPoint.setPointType(value);
  			}
  		}
  	}
  
  	/**
  	 * React to the end of an XML tag
  	 */
  	public void endElement(String inUri, String inLocalName, String inTagName)
  	throws SAXException
  	{
  		if (inTagName.equals("node"))
  		{
  			// end of the entry
  			if (_currPoint.getTrackName() != null && !_currPoint.getTrackName().equals(""))
  			_pointList.add(_currPoint);
  		}
  		super.endElement(inUri, inLocalName, inTagName);
  	}
  
  	/**
  	 * @return the list of points
  	 */
  	public ArrayList<SearchResult> getPointList()
  	{
  		return _pointList;
  	}
  }
  