AGDeleteTriples.java

package com.franz.ag.examples;

import com.franz.ag.*;

public class AGDeleteTriples {

    /**
     * Demonstrates some basics of deleting triples
     * 
     * @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 fresh triple-store for this example.
        AllegroGraph ts = ags.renew("deletetriples", AGPaths.TRIPLE_STORES);
        
        // Register namespaces
        ts.registerNamespace("ex","http://example.org/");
        
        // Add some triples to the store
        ts.addStatement("!ex:a","!ex:p", "!ex:b");
        ts.addStatement("!ex:b","!ex:p", "!ex:c");
        ts.addStatement("!ex:p","!rdf:type", "!owl:TransitiveProperty");
        
        // Retrieve some triples 
        Cursor cc = ts.getStatements(false,null,null,null);
        System.out.println("Showing all triples:");
        AGUtils.showTriples(cc);

        // Delete all transitive properties
        ts.removeStatements(null, "!rdf:type", "!owl:TransitiveProperty");

        // Retrieve all remaining triples 
        cc = ts.getStatements(false,null,null,null);
        System.out.println("Remaining triples:");
        AGUtils.showTriples(cc);

        // Close the triple store and disconnect from the server.
        ts.closeTripleStore();
        ags.disable();
    }

}

Up | Next