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AGNamedGraphs.java

package com.franz.agbase.examples;



import com.franz.agbase.*;



public class AGNamedGraphs {



    /**

     * Demonstrates some basics of working with named graphs.

     * 

     * @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 for this example.

        AllegroGraph ts = ags.renew("namedgraphs", AGPaths.TRIPLE_STORES);

        

        // Register any namespaces

        ts.registerNamespace("ex","http://example.org/");

        

        // Add a triple to the default graph in the store

        ts.addStatement("!ex:a", "!ex:p", "!ex:b");

        

        // Add a triple to a named graph in the store

        ts.addStatement("!ex:Dog","!rdf:type","!owl:Class","<http://animals.example.org>"); 

        

        // Show all triples in all graphs in the store

        System.out.println("Show all triples in all graphs in the store");

        TriplesIterator cc = ts.getStatements(null, null, null, null);

        AGUtils.showTriples(cc);

        

        // Show all triples in a named graph in the store

        System.out.println("Show all triples in graph http://animals.example.org");

        cc = ts.getStatements(null, null, null, "<http://animals.example.org>");

        AGUtils.showTriples(cc);

        

        // Show all triples in the default graph

        System.out.println("Show all triples in the default graph");

        cc = ts.getStatements(null, null, null);

        AGUtils.showTriples(cc);

        

        // Another way of showing all triples in the default graph

        System.out.println("Another way of showing all triples in the default graph");

        cc = ts.getStatements(null, null, null, "");

        AGUtils.showTriples(cc);

        

        // Close the store and disconnect from the server.

        ts.closeTripleStore();

        ags.disable();

    }

}

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AGJenaNamedGraphs.java NOTE: the information on this page pertains to AllegroGraph version 3.x. There is no corresponding 4.x page at this time.

AGJenaNamedGraphs.java

package com.franz.agjena.examples;







import java.util.Iterator;



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.franz.agjena.AllegroGraphReasoner;

import com.hp.hpl.jena.graph.Graph;

import com.hp.hpl.jena.rdf.model.Model;



public class AGJenaNamedGraphs {



    /**

     * Demonstrates using multiple named Graphs in store, and inference

     *

     * @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("jenatest4", AGPaths.TRIPLE_STORES);



        // Get a Graph Maker for the store

        AllegroGraphGraphMaker maker = new AllegroGraphGraphMaker(ts);

        maker.setDefaultIsGraphOfAllGraphs(true);



        // Create several Graphs and Models 

        String demoNamespace = "http://ag.franz.com/demo#";

        String graphName1 = demoNamespace + "context1";

        String graphName2 = demoNamespace + "context2";

        Graph graphAll = maker.getGraph(); // default graph represents the graph containing all triples 

        Graph graphOne = maker.createGraph(graphName1);

        Graph graphTwo = maker.createGraph(graphName2);

        Graph graphThree = new AllegroGraphReasoner().bind(graphTwo);

        Model modelAll = new AllegroGraphModel(graphAll);

        Model modelOne = new AllegroGraphModel(graphOne);

        Model modelTwo = new AllegroGraphModel(graphTwo);

        

        // Show all graph names

        for (Iterator<?> it = maker.listGraphs(); it.hasNext();) {

            System.out.println("GraphName: " + it.next());

        }



        // Load some data

        String inputFileName1 = AGPaths.dataSources("vc-db-1.rdf");

        String inputFileName2 = AGPaths.dataSources("football.nt");

        modelOne.read(inputFileName1, "RDF/XML" );

        modelTwo.read(inputFileName2, "N-TRIPLE" );

        

        // A query

        String query = "select ?s ?p ?o where {?s ?p ?o }";

        

        // return all triples (or none)

        AGJenaUtils.doQuery(query, modelAll);

        

        // retrieve all vcard triples

        AGJenaUtils.doQuery(query, modelOne);



        // retrieve all football triples (no inference)         

        AGJenaUtils.doQuery(query, modelTwo);



        // retrieve all football triples with inference

        AGJenaUtils.doQuery(query, graphThree);

    

        // Close the store and disconnect from the server

        ts.closeTripleStore();

        ags.disable();

    }



}

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