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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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