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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