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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