# AGJenaGraphInterface.java

`package com.franz.agjena.examples;
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.hp.hpl.jena.graph.Graph;
import com.hp.hpl.jena.graph.GraphMaker;
import com.hp.hpl.jena.graph.Node;
import com.hp.hpl.jena.graph.Triple;
import com.hp.hpl.jena.graph.test.NodeCreateUtils;
public class AGJenaGraphInterface {
/**
* Demonstrates the Jena Graph interface to AllegroGraph.
*
* @param args unused
* @throws AllegroGraphException
*/
public static void main(String[] args) throws AllegroGraphException {
// Show the empty graph
showGraph(Graph.emptyGraph);
// 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("store", AGPaths.TRIPLE_STORES);
// Create a GraphMaker for the store.
GraphMaker maker = new AllegroGraphGraphMaker(ts);
// Get the default graph
Graph g = maker.getGraph();
showGraph(g);
// Add a triple to the graph
Node r = NodeCreateUtils.create( "r" ), s = NodeCreateUtils.create( "s" ), p = NodeCreateUtils.create( "P" );
Triple t1 = Triple.create( r, p, s );
g.add(t1);
showGraph(g);
// Check that the graph contains the triple
boolean b = g.contains( t1 );
System.out.println("contains ( t1 ): " + b);
// Check another way
b = g.contains( r, p, Node.ANY );
System.out.println("contains( r, p, Node.ANY ): " + b);
// And yet another way
Triple t2 = Triple.create( r, p, s );
b = g.contains( t2 );
System.out.println("contains( t2 ): " + b);
// Show number found using find
int size = g.find( r, p, Node.ANY ).toList().size();
System.out.println("number found: " + size);
// And compare against the number of triples in the store
System.out.println("numberOfTriples(): " + ts.numberOfTriples());
// Close the store and disconnect from the server
ts.closeTripleStore();
ags.disable();
}
public static void showGraph(Graph g) {
System.out.println(g.toString()+": "+g.size()+" triples.");
}
}
`

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