AGLoadRDF.java
package com.franz.agbase.examples;
import com.franz.agbase.*;
public class AGLoadRDF {
/**
* Demonstrates loading a triple store from files in RDF/XML format.
*
* @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("loadRDF", AGPaths.TRIPLE_STORES);
// Load a server-side file in RDF/XML format into the store's default graph.
loadRDFWithTiming(ts, AGPaths.dataSources("rdf-axioms.rdf"));
// Get some triples from the default graph and show them.
TriplesIterator it = ts.getStatements(null, null, null);
AGUtils.showTriples(it, 20);
// Load RDF data into a named graph
URINode g = ts.createURI("http://example.org/wilburwine");
loadRDFWithTiming(ts, AGPaths.dataSources("wilburwine.rdf"), g);
// Get some triples from the named graph g and show them.
it = ts.getStatements(null, null, null, g);
AGUtils.showTriples(it, 20);
// Load RDF/XML from a URL into a graph named by the URL
ts.loadRDFXML("http://www.w3.org/TR/owl-guide/wine.rdf","source");
// Get some triples from the named graph and show them.
it = ts.getStatements(null, null, null,"<http://www.w3.org/TR/owl-guide/wine.rdf>");
AGUtils.showTriples(it, 20);
// If you have a number of files to load, it is more efficient to
// provide an array of filenames rather than loading them separately.
String[] files = {
AGPaths.dataSources("Geonames_v2.0_Lite.rdf"),
AGPaths.dataSources("iswc-aswc-2007-complete.rdf"),
"http://www.w3.org/TR/2004/REC-owl-guide-20040210/food.rdf"
};
loadRDFWithTiming(ts,files,"source");
// Get some triples and note their source graph.
it = ts.getStatements("<http://www.geonames.org/ontology#T.ISLT>", null, null, null);
AGUtils.showTriples(it);
// Close the triple store and disconnect from the server.
ts.closeTripleStore();
ags.disable();
}
/**
* Load a single RDF/XML file into the default graph and time the load.
*
* @param ts A triple store
* @param rdfFile A server-accessible RDF/XML file
* @throws AllegroGraphException
*/
public static void loadRDFWithTiming(AllegroGraph ts, String rdfFile) throws AllegroGraphException {
loadRDFWithTiming(ts, rdfFile, "");
}
/**
* Load a single RDF/XML file into the specified graph and time the load.
*
* @param ts A triple store
* @param rdfFile A server-accessible RDF/XML file
* @param graph The context to load
* @throws AllegroGraphException
*/
public static void loadRDFWithTiming(AllegroGraph ts, String rdfFile, Object graph) throws AllegroGraphException {
System.out.println("Loading RDF from " + rdfFile);
long start = System.currentTimeMillis();
long n = ts.loadRDFXML(rdfFile, graph);
System.out.println("Done loading " + n + " triples in " + AGUtils.elapsedTime(start));
}
/**
* Load an array of RDF/XML files into the specified graph and time the load.
*
* @param ts A triple store
* @param rdfFiles An array of server-accessible RDF/XML files
* @param graph The context to load
* @return
* @throws AllegroGraphException
*/
public static long loadRDFWithTiming(AllegroGraph ts, String[] rdfFiles, String graph) throws AllegroGraphException {
System.out.println("Loading " + rdfFiles.length + " RDF/XML files.");
long start = System.currentTimeMillis();
long n = ts.loadRDFXML(rdfFiles, graph, null, false, false);
System.out.println("Done loading " + n + " triples in " + AGUtils.elapsedTime(start));
return n;
}
}
| Copyright © 2023 Franz Inc., All Rights Reserved | Privacy Statement | 
|
|
|
|
|
|