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AGJenaGraphMakerInterface.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.shared.ReificationStyle;

import com.hp.hpl.jena.util.iterator.ExtendedIterator;



public class AGJenaGraphMakerInterface {



    /**

     * Demonstrates the Jena GraphMaker interface to AllegroGraph.

     *

     * @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 fresh triple stores

        AllegroGraph ts1 = ags.renew("store1", AGPaths.TRIPLE_STORES);

        AllegroGraph ts2 = ags.renew("store2", AGPaths.TRIPLE_STORES);



        // Create a GraphMaker (a Graph factory) for each store.

        GraphMaker maker1 = new AllegroGraphGraphMaker(ts1);

        GraphMaker maker2 = new AllegroGraphGraphMaker(ts2);

        

        // Show the default graph for maker1

        Graph defaultGraph1 = maker1.getGraph();

        showGraphName(defaultGraph1);

        

        // Show the default graph for maker2

        Graph defaultGraph2 = maker2.getGraph();

        showGraphName(defaultGraph2);

        

        // Show an anonymous graph for maker1

        Graph anonGraph1a = maker1.createGraph();

        showGraphName(anonGraph1a);

        

        // Show another anonymous graph for maker1

        Graph anonGraph1b = maker1.createGraph();

        showGraphName(anonGraph1b);

        

        // Show an anonymous graph for maker2

        Graph anonGraph2a = maker2.createGraph();

        showGraphName(anonGraph2a);

        

        // Show another anonymous graph for maker2

        Graph anonGraph2b = maker2.createGraph();

        showGraphName(anonGraph2b);

        

        // Show a named graph foo in maker1

        Graph foo1 = maker1.createGraph("http://example.org/foo", true);

        showGraphName(foo1);

 

        // Try to strict-create another named graph foo in maker1

        // Uncommenting this should throw an exception.

        /*

        try {

            Graph foo1b = maker1.createGraph("http://example.org/foo", true);

            showGraph(foo1b);

        } catch (Exception e) {

            System.out.println("This is an expected exception: ");

            e.printStackTrace();

        }

        */

 

        // Show a named graph foo in maker2

        Graph foo2 = maker2.createGraph("http://example.org/foo", true);

        showGraphName(foo2);

 

        // List the graphs in maker1 

        ExtendedIterator it1 = maker1.listGraphs();

        while (it1.hasNext()) {

            System.out.println(it1.next());

        }

        

        // List the graphs in maker2 

        ExtendedIterator it2 = maker2.listGraphs();

        while (it2.hasNext()) {

            System.out.println(it2.next());

        }

        

        // Show the default reification style

        ReificationStyle rs = maker1.getReificationStyle();

        System.out.println("ReificationStyle: " + rs.toString());

        

        // Close the triple stores and disconnect from the server

        ts1.closeTripleStore();

        ts2.closeTripleStore();

        ags.disable();

    }



    public static void showGraphName(Graph g) {

        System.out.println(g.toString());

    }

}
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