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AGGetStatements.java

package com.franz.agbase.examples;



import com.franz.agbase.*;



public class AGGetStatements {



    /**

     * Demonstrates some basics of retrieval by matching triple parts. 

     *

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



        // Register your namespaces

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

        

        // Add some triples to the store

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

        ts.addStatement("!ex:p","!rdfs:domain", "!ex:D");

        ts.addStatement("!ex:p","!rdfs:range", "!ex:R");

        

        // Retrieve triples by matching subject

        TriplesIterator cc = ts.getStatements(false,"!ex:a",null,null);

        System.out.println("Retrieving triples with subject ex:a");

        AGUtils.showTriples(cc);



        // Retrieve triples by matching predicate

        cc = ts.getStatements(false,null,"!rdfs:domain",null);

        System.out.println("Retrieving triples with predicate rdfs:domain");

        AGUtils.showTriples(cc);



        // Retrieve triples by matching object

        cc = ts.getStatements(false,null,null,"!ex:b");

        System.out.println("Retrieving triples with object ex:b");

        AGUtils.showTriples(cc);



        // Close the triple store and disconnect from the server

        ts.closeTripleStore();

        ags.disable();

    }



}
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