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AGIndexAllTriples.java

package com.franz.ag.examples;



import com.franz.ag.*;



public class AGIndexAllTriples {



    /**

     * Demonstrates loading and querying of the Wilburwine dataset.

     * 

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



        // Load the wilburwine dataset

        String ntripleFile = AGPaths.dataSources("wilburwine.ntriples");        

        System.out.println("Loading N-Triples " + ntripleFile);

        AGUtils.loadNTriplesWithTiming(ts,ntripleFile);

        

        // Register a wine namespace

        ts.registerNamespace("wine", "http://www.w3.org/TR/2003/CR-owl-guide-20030818/wine#");

        

        // Get triples having subject CabernetSauvignonGrape and show them

        System.out.println("Triples with Subject: CabernetSauvignonGrape");

        long t0 = System.nanoTime();

        Cursor cc = ts.getStatements("!wine:CabernetSauvignonGrape",null, null);

        AGUtils.showTriples(cc);

        long t1 = System.nanoTime();

        System.out.println("Query (before indexing) took " + (long)(t1-t0) + " nanoseconds");



        // Index the triple store for faster querying

        ts.indexAllTriples();



        // Get triples having subject CabernetSauvignonGrape and show them

        System.out.println("Triples with Subject: CabernetSauvignonGrape");

        long t2 = System.nanoTime();

        cc = ts.getStatements("!wine:CabernetSauvignonGrape",null, null);

        AGUtils.showTriples(cc);

        long t3 = System.nanoTime();

        System.out.println("Query (after indexing) took " + (long)(t3-t2) + " nanoseconds");



        // Close the triple store and disconnect from the server.

        ts.closeTripleStore();

        ags.disable();

    }



}
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