AGGeospatialPredicateMapping.java
package com.franz.agbase.examples;
import com.franz.agbase.*;
public class AGGeospatialPredicateMapping {
/**
* Demonstrates using a Geospatial predicate mapping to load geospatial data.
*
* @param args unused
* @throws AllegroGraphException
*/
public static void main(String[] args) throws AllegroGraphException {
// Connect to server, which must already be running.
AllegroGraphConnection ags = new AllegroGraphConnection();
try {
ags.enable();
} catch (Exception e) {
throw new AllegroGraphException("Server connection problem", e);
}
// Create a fresh triple-store.
AllegroGraph ts = ags.renew("geospatialpredicatemapping", AGPaths.TRIPLE_STORES);
// Register namespaces
ts.registerNamespace("ex","http://example.org/places/");
ts.registerNamespace("geo","http://franz.com/ns/allegrograph/3.0/geospatial/");
// Get a GeoExtension instance for this store to work with geospatial features
GeoExtension geo = ts.getGeoExtension();
// Define a geospatial subtype to encode longitude-latitude coordinates
GeospatialSubtype subtype50 = geo.registerLatitudeStripingInMiles(50.0);
geo.addSubtype(subtype50);
// Add a predicate mapping to encode loaded locations as Geospatial UPIs
geo.addSphericalPredicateMapping("http://example.org/locationB", subtype50);
//geo.addSphericalDatatypeMapping("http://franz.com/ns/allegrograph/3.0/geospatial/spherical/miles/-180.0/180.0/-90.0/90.0/50.0d0", subtype50);
// Load some geospatial data
AGLoadNtriples.loadNTriplesWithTiming(ts, AGPaths.dataSources("geospatial.nt"));
// Show all triples in the store
TriplesIterator cc = ts.getStatements(null,null,null);
AGUtils.showTriples(cc);
// Close the store and disconnect from the server.
ts.closeTripleStore();
ags.disable();
}
}
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