AGIndexAllTriples.java

package com.franz.agbase.examples;

import com.franz.agbase.*;

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);
        AGLoadNtriples.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();
        TriplesIterator 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();
    }

    public static void indexAllTriplesWithTiming(AllegroGraph ts) throws AllegroGraphException {
        System.out.print("Indexing...");
        long start = System.currentTimeMillis();
        ts.indexAllTriples(true);
        System.out.println("done in " + AGUtils.elapsedTime(start));
    }

}

Up | Next

Copyright © 2014 Franz Inc., All Rights Reserved | Privacy Statement
Delicious Google Buzz Twitter Google+