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AGTriplesQueryCount.java

package com.franz.ag.examples;



import com.franz.ag.*;



public class AGTriplesQueryCount {



    /**

     * Demonstrates using the TriplesQuery count method. 

     *

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



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

        

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

        ts.addStatement("!ex:a","!ex:q", "!ex:b", "<g>");

        ts.addStatement("!ex:a","!ex:r", "!ex:b", "<g>");

        ts.addStatement("!ex:a","!ex:s", "!ex:b", "<g>");

        ts.addStatement("!ex:a","!ex:t", "!ex:b", "<h>");

        ts.addStatement("!ex:a","!ex:u", "!ex:b", "<h>");

        

        TriplesQuery tq = new TriplesQuery();

        tq.setContext("<g>");

        long g_count = tq.count(ts);

        System.out.println("Number of triples in context g: " + g_count);

        

        tq.setContext("<h>");

        long h_count = tq.count(ts);

        System.out.println("Number of triples in context h: " + h_count);

        

        

        // Close the triple store and disconnect from the server

        ts.closeTripleStore();

        ags.disable();

    }



}
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