Version 19, May 2018

[GpsPrune.git] / tim / prune / function / SearchOsmPoisXmlHandler.java

diff --git a/tim/prune/function/SearchOsmPoisXmlHandler.java b/tim/prune/function/SearchOsmPoisXmlHandler.java
new file mode 100644 (file)
index 0000000..5683ece
--- /dev/null
+++ b/tim/prune/function/SearchOsmPoisXmlHandler.java
@@ -0,0 +1,92 @@
+package tim.prune.function;
+
+import java.util.ArrayList;
+
+import org.xml.sax.Attributes;
+import org.xml.sax.SAXException;
+import org.xml.sax.helpers.DefaultHandler;
+
+import tim.prune.function.search.SearchResult;
+
+/**
+ * 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;
+       private String _errorMessage = 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<SearchResult>();
+               }
+               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;
+       }
+
+       /**
+        * @return error message, if any
+        */
+       public String getErrorMessage() {
+               return _errorMessage;
+       }
+}