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AGJenaSelectors.java

package com.franz.agjena.examples;





import java.io.InputStream;



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.rdf.model.Model;

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

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

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

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

import com.hp.hpl.jena.util.FileManager;

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



public class AGJenaSelectors {



    /**

     * Demonstrates Jena Tutorial 08 using AllegroGraph: selectors.

     *

     * @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("jenatutorial08", AGPaths.TRIPLE_STORES);



        // Create a Graph maker for the store

        AllegroGraphGraphMaker maker = new AllegroGraphGraphMaker(ts);

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

        Graph graph = maker.createGraph("http://foo#bar");

        Model model = new AllegroGraphModel(graph);

      

        // use the FileManager to find the input file

        InputStream in = FileManager.get().open(inputFileName);

        if (in == null) {

            throw new IllegalArgumentException( "File: " + inputFileName + " not found");

        }

 

        // read the RDF/XML file

        model.read( in, "" );

        

        // select all the resources with a VCARD.FN property

        // whose value ends with "Smith"

        System.out.println("Model has " + model.size() + " triples.");

        StmtIterator iter = model.listStatements(

            new SimpleSelector(null, VCARD.FN, (RDFNode) null) {

                    public boolean selects(Statement s) {

                            return s.getString().endsWith("Smith");

                    }

                });

        if (iter.hasNext()) {

            System.out.println("The database contains vcards for:");

            while (iter.hasNext()) {

                System.out.println("  " + iter.nextStatement()

                                              .getString());

            }

        } else {

            System.out.println("No Smith's were found in the database");

        }

        AGJenaUtils.printModel(model);



        // Close the triple store and disconnect from the server

        ts.closeTripleStore();

        ags.disable();

    }



}
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