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AGJenaStatements.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.franz.agjena.AllegroGraphModel;

import com.hp.hpl.jena.graph.Graph;

import com.hp.hpl.jena.graph.GraphMaker;

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

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

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

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

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

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

import com.hp.hpl.jena.vocabulary.VCARD;



public class AGJenaStatements {



    /**

     * Demonstrates Jena Tutorial 03 using AllegroGraph -- working with Statements.

     *

     * @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("jenatutorial03", AGPaths.TRIPLE_STORES);



        // Create a Graph maker for the store

        GraphMaker maker = new AllegroGraphGraphMaker(ts);

            

        // some definitions

        String personURI    = "http://somewhere/JohnSmith";

        String givenName    = "John";

        String familyName   = "Smith";

        String fullName     = givenName + " " + familyName;

        

        // create an empty graph and a model for it:

        Graph graph = maker.getGraph();

        Model model = new AllegroGraphModel(graph);

        

        // create the resource

        //   and add the properties cascading style

        Resource johnSmith = model.createResource(personURI)

                .addProperty(VCARD.FN, fullName)

                    .addProperty(VCARD.N, 

                              model.createResource()

                                   .addProperty(VCARD.Given, givenName)

                                   .addProperty(VCARD.Family, familyName));

        

        johnSmith.addLiteral(VCARD.FN, "John J. Smith");

        

        // list the statements in the graph

        StmtIterator iter = model.listStatements();

        

        // print out the predicate, subject and object of each statement

        while (iter.hasNext()) {

            Statement stmt      = iter.nextStatement();

            Resource  subject   = stmt.getSubject();

            Property  predicate = stmt.getPredicate();

            RDFNode   object    = stmt.getObject();

            System.out.print(subject.toString());

            System.out.print(" " + predicate.toString() + " ");

            if (object instanceof Resource) {

                System.out.print(object.toString());

            } else {

                // object is a literal

                System.out.print(" \"" + object.toString() + "\"");

            }

            System.out.println(" .");

        }

        

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

        AGJenaUtils.doQuery(query, model);

 

        // Close the triple store and disconnect from the server

        ts.closeTripleStore();

        ags.disable();

    }



}
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