AGTriplesQueryCount.java

package com.franz.agbase.examples;

import com.franz.agbase.*;

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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