AGLoadUsingRapper.java
package com.franz.agbase.examples;
import com.franz.agbase.*;
public class AGLoadUsingRapper {
public static int port = 4567;
/**
* Demonstrates loading RDF/XML using the Rapper utility.
*
* Rapper can be obtained here: http://librdf.org/raptor/rapper.html
*
* Rapper must be installed separately and must be accessible
* from the server.
*
* RDF/XML data is piped through Rapper and converted to
* N-Triples before loading. For large RDF/XML files, it
* can be more efficient to use this Rapper option.
*
* @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.setPort(port);
ags.enable();
} catch (Exception e) {
throw new AllegroGraphException("Server connection problem", e);
}
// Create a fresh triple store.
AllegroGraph ts = ags.renew("Wine", AGPaths.TRIPLE_STORES);
// Load RDF/XML using Rapper
try {
long start = System.nanoTime();
long n = ts.loadRDFXML(AGPaths.dataSources("wilburwine.rdf"), "", null, true, false);
long delta = System.nanoTime() - start;
System.out.println("Done loading " + n + " triples in " + (delta/1000000000.0) + " seconds.");
// Get some triples and show them.
TriplesIterator it = ts.getStatements(null, null, null);
AGUtils.showTriples(it, 20);
} catch (IllegalArgumentException e) {
if (e.getMessage().contains("unable-to-find-rapper-error")) {
throw new AllegroGraphException("Rapper was not found. Please ensure you have Rapper installed and that it is accessible to the server.");
} else {
throw new AllegroGraphException(e.getMessage());
}
}
// Close the triple store and disconnect from the server.
ts.closeTripleStore();
ags.disable();
}
}
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