# AGJenaSelectors.java

`package com.franz.agjena.examples;
import java.io.InputStream;
import com.franz.agbase.AllegroGraph;
import com.franz.agbase.AllegroGraphConnection;
import com.franz.agbase.AllegroGraphException;
import com.franz.agbase.examples.AGPaths;
import com.franz.agjena.AllegroGraphGraphMaker;
import com.franz.agjena.AllegroGraphModel;
import com.hp.hpl.jena.graph.Graph;
import com.hp.hpl.jena.rdf.model.Model;
import com.hp.hpl.jena.rdf.model.RDFNode;
import com.hp.hpl.jena.rdf.model.SimpleSelector;
import com.hp.hpl.jena.rdf.model.Statement;
import com.hp.hpl.jena.rdf.model.StmtIterator;
import com.hp.hpl.jena.util.FileManager;
import com.hp.hpl.jena.vocabulary.VCARD;
public class AGJenaSelectors {
/**
* Demonstrates Jena Tutorial 08 using AllegroGraph: selectors.
*
* @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("jenatutorial08", AGPaths.TRIPLE_STORES);
// Create a Graph maker for the store
AllegroGraphGraphMaker maker = new AllegroGraphGraphMaker(ts);
String inputFileName = AGPaths.dataSources("vc-db-1.rdf");
Graph graph = maker.createGraph("http://foo#bar");
Model model = new AllegroGraphModel(graph);
// use the FileManager to find the input file
InputStream in = FileManager.get().open(inputFileName);
if (in == null) {
throw new IllegalArgumentException( "File: " + inputFileName + " not found");
}
// read the RDF/XML file
model.read( in, "" );
// select all the resources with a VCARD.FN property
// whose value ends with "Smith"
System.out.println("Model has " + model.size() + " triples.");
StmtIterator iter = model.listStatements(
new SimpleSelector(null, VCARD.FN, (RDFNode) null) {
public boolean selects(Statement s) {
return s.getString().endsWith("Smith");
}
});
if (iter.hasNext()) {
System.out.println("The database contains vcards for:");
while (iter.hasNext()) {
System.out.println(" " + iter.nextStatement()
.getString());
}
} else {
System.out.println("No Smith's were found in the database");
}
AGJenaUtils.printModel(model);
// Close the triple store and disconnect from the server
ts.closeTripleStore();
ags.disable();
}
}
`

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