Added support for GEO visualization

src/main/java/cz/cvut/kbss/pubby/Point.java

@@ -0,0 +1,22 @@
+package cz.cvut.kbss.pubby;
+
+/**
+ * Petr Křemen, 2013
+ * [email protected]
+ */
+public class Point {
+    double lng, lat;
+
+    public Point(double lng, double lat) {
+        this.lng = lng;
+        this.lat = lat;
+    }
+
+    public double getLng() {
+        return lng;
+    }
+
+    public double getLat() {
+        return lat;
+    }
+}

src/main/java/cz/cvut/kbss/pubby/servlets/ResourceDescriptionProvider.java

@@ -0,0 +1,12 @@
+package cz.cvut.kbss.pubby.servlets;
+
+import com.hp.hpl.jena.rdf.model.Resource;
+import de.fuberlin.wiwiss.pubby.ResourceDescription;
+
+/**
+ * Petr Křemen, 2013
+ * [email protected]
+ */
+public interface ResourceDescriptionProvider {
+     public Resource get(String url);
+}

src/main/java/cz/cvut/kbss/pubby/vocab/GEO.java

@@ -0,0 +1,35 @@
+package cz.cvut.kbss.pubby.vocab;
+
+import com.hp.hpl.jena.rdf.model.Model;
+import com.hp.hpl.jena.rdf.model.ModelFactory;
+import com.hp.hpl.jena.rdf.model.Property;
+import com.hp.hpl.jena.rdf.model.Resource;
+
+/**
+ * Petr Křemen 2013
+ * [email protected]
+ */
+public class GEO {
+
+    /** <p>The RDF model that holds the vocabulary terms</p> */
+    private static Model m_model = ModelFactory.createDefaultModel();
+
+    /** <p>The namespace of the vocabulary as a string</p> */
+    public static final String NS = "http://www.w3.org/2003/01/geo/wgs84_pos#";
+
+    /** <p>The namespace of the vocabulary as a string</p>
+     *  @see #NS */
+    public static String getURI() {return NS;}
+
+    /** <p>The namespace of the vocabulary as a resource</p> */
+    public static final Resource NAMESPACE = m_model.createResource( NS );
+
+    /** <p>Longitude property.</p> */
+    public static final Property P_LONG = m_model.createProperty( NS + "long" );
+
+    /** <p>Latitude property.</p> */
+    public static final Property P_LAT = m_model.createProperty( NS + "lat" );
+
+    /** <p>Latitude property.</p> */
+    public static final Property P_LOCATION = m_model.createProperty( NS + "location" );
+}

src/main/java/de/fuberlin/wiwiss/pubby/ResourceDescription.java

@@ -19,7 +19,9 @@
 import com.hp.hpl.jena.shared.PrefixMapping;
 import com.hp.hpl.jena.shared.impl.PrefixMappingImpl;
 
-import de.fuberlin.wiwiss.pubby.Configuration;
+import cz.cvut.kbss.pubby.Point;
+import cz.cvut.kbss.pubby.servlets.ResourceDescriptionProvider;
+import cz.cvut.kbss.pubby.vocab.GEO;
 
 /**
  * A convenient interface to an RDF description of a resource.
@@ -36,8 +38,9 @@ public class ResourceDescription {
 	private final Configuration config;
 	private PrefixMapping prefixes = null;
 	private List<ResourceProperty> properties = null;
-
-	public ResourceDescription(HypermediaResource resource, Model model, 
+    private List<Point> points;
+
+    public ResourceDescription(HypermediaResource resource, Model model,
 			Configuration config) {
 		this.hypermediaResource = resource;
 		this.model = model;
@@ -316,4 +319,44 @@ public int compareTo(Value other) {
 			return getNode().getLiteralLexicalForm().compareTo(otherValue.getNode().getLiteralLexicalForm());
 		}
 	}
+
+    private void addPoint(final Resource r) {
+        final Statement lngS = r.getProperty(GEO.P_LONG);
+        final Statement latS = r.getProperty(GEO.P_LAT);
+
+        if ( lngS != null || latS != null ) {
+            points.add(new Point(lngS.getObject().asLiteral().getDouble(),latS.getObject().asLiteral().getDouble()));
+        }
+    }
+
+    /**
+     * Adds retrieves all points connected by geo:location property to this resource.
+     *
+     * @param p provider for data of the location resources
+     */
+    private void addAllPoints(ResourceDescriptionProvider p) {
+        final StmtIterator it= resource.listProperties(GEO.P_LOCATION);
+        while(it.hasNext()) {
+            Statement s = it.nextStatement();
+            if ( !s.getObject().isAnon() ) {
+                addPoint(p.get(s.getObject().asResource().getURI()));
+            }
+        }
+        addPoint(resource);
+    }
+
+    /**
+     * Gets all points that are relevant to this resource. This includes
+     * 1) the point extracted from the geo:lat and geo:long properties of this resource
+     * 2) all the points connected to this resource by geo:location property.
+     * @param p provider for retrieving resource descriptions
+     * @return
+     */
+    public List<Point> getPoints(ResourceDescriptionProvider p) {
+        if (points == null) {
+            points = new ArrayList<Point>();
+            addAllPoints(p);
+        }
+        return points;
+    }
 }

src/main/java/de/fuberlin/wiwiss/pubby/servlets/PageURLServlet.java

@@ -9,6 +9,7 @@
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
 
+import cz.cvut.kbss.pubby.servlets.ResourceDescriptionProvider;
 import org.apache.velocity.app.Velocity;
 import org.apache.velocity.context.Context;
 
@@ -32,9 +33,9 @@ public class PageURLServlet extends BaseURLServlet {
 
 	public boolean doGet(HypermediaResource controller,
 			Collection<MappedResource> resources, 
-			HttpServletRequest request,
+			final HttpServletRequest request,
 			HttpServletResponse response,
-			Configuration config) throws ServletException, IOException {
+			final Configuration config) throws ServletException, IOException {
 
 		Model description = getResourceDescription(resources);
 
@@ -66,8 +67,15 @@ public boolean doGet(HypermediaResource controller,
 		context.put("title", resourceDescription.getLabel());
 		context.put("comment", resourceDescription.getComment());
 		context.put("image", resourceDescription.getImageURL());
-		context.put("properties", resourceDescription.getProperties());
-
+        context.put("properties", resourceDescription.getProperties());
+        context.put("geoPoints", resourceDescription.getPoints(new ResourceDescriptionProvider() {
+            @Override
+            public Resource get(String url) {
+                return getResourceDescription(config.getMappedResourcesFromRelativeWebURI(
+                        url.substring(config.getWebApplicationBaseURI().length()), true)).getResource(url);
+            }
+        }));
+
 		try {
 			Model metadata = ModelFactory.createDefaultModel();
 			for (MappedResource resource: resources) {

src/main/webapp/WEB-INF/templates/page.vm

@@ -23,4 +23,34 @@
 	<a href="#meta" onclick="showAllMetadata('metadata-tables')">expand all</a>
 #end
 
+#if (!$geoPoints.isEmpty())
+<a name="geo"></a>
+<h2>Geographic location</h2>
+<div id="map">
+</div>
+<script src="${server_base}static/jquery-1.9.1.min.js"></script>
+<script src="${server_base}static/OpenLayers.js"></script>
+<script type="text/javascript">
+        map = new OpenLayers.Map('map',
+                {
+                    controls: [new OpenLayers.Control.Navigation(), new OpenLayers.Control.PanZoomBar(), new OpenLayers.Control.Attribution(),
+                        new OpenLayers.Control.PanZoom(), new OpenLayers.Control.Permalink(), new OpenLayers.Control.Navigation() ],
+                    numZoomLevels: 22//,
+                }
+        );
+        var fromProjection = new OpenLayers.Projection("EPSG:4326");   // Transform from WGS 1984
+        var toProjection   = new OpenLayers.Projection("EPSG:900913"); // to Spherical Mercator Projection
+        markers=new OpenLayers.Layer.Markers( "Markers" );
+        map.addLayers([new OpenLayers.Layer.OSM(),markers]);
+        #set($x = 0)
+        #foreach($i in $geoPoints)
+            #if($x == 0)
+                map.setCenter(new OpenLayers.LonLat(${i.lng},${i.lat}).transform( fromProjection, toProjection ),10);
+            #end
+            markers.addMarker(new OpenLayers.Marker(new OpenLayers.LonLat(${i.lng},${i.lat}).transform( fromProjection, toProjection)));
+            #set($x = $x+1)
+        #end
+</script>
+#end
+
 #parse("footer.vm")