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AGRepositoryGetStatements.java

package com.franz.ag.repository.examples;



import static com.franz.ag.repository.examples.AGRepositoryValueFactory.*;

import info.aduna.iteration.CloseableIteration;



import org.openrdf.model.Statement;

import org.openrdf.model.ValueFactory;

import org.openrdf.repository.Repository;

import org.openrdf.repository.RepositoryConnection;

import org.openrdf.repository.RepositoryException;

import org.openrdf.repository.RepositoryResult;



import com.franz.ag.repository.AGRepository;

import com.franz.agbase.AllegroGraph;

import com.franz.agbase.AllegroGraphConnection;

import com.franz.agbase.AllegroGraphException;

import com.franz.agbase.examples.AGPaths;



public class AGRepositoryGetStatements {



    /**

     * Demonstrates basics of using getStatements 

     * 

     * @param args unused

     * @throws AllegroGraphException

     */

    public static void main(String[] args) throws Exception {

        // Connect to the server, which must already be running.

        AllegroGraphConnection ags = new AllegroGraphConnection();

        try {

            ags.enable();

        } catch (Exception e) {

            throw new AllegroGraphException("Server connection problem", e);

        }



        // Get a connection to a fresh repository

        AllegroGraph ts = ags.renew("repositorygetstatements", AGPaths.TRIPLE_STORES);

        Repository repo = new AGRepository(ts);

        repo.initialize();

        RepositoryConnection repoConn = repo.getConnection();

        

        // Get the ValueFactory for the Repository and create some example values. 

        ValueFactory vf = repo.getValueFactory();

        createExampleValues(vf);



        repoConn.add(bob, name, nameBob);



        RepositoryResult<Statement> result = repoConn.getStatements(null, name,

                null, false);



        try {

            while (result.hasNext()) {

                Statement st = result.next();

                System.out.print(st.getSubject());

                System.out.print(", " + st.getPredicate());

                System.out.print(", " + st.getObject().stringValue());

                System.out.println(", " + st.getContext());

            }

        } finally {

            result.close();

        }



        repoConn.add(bob, name, nameBob, context1);

        repoConn.add(bob, mbox, mboxBob, context1);

        repoConn.add(context1, publisher, nameBob);



        repoConn.add(alice, name, nameAlice, context2);

        repoConn.add(alice, mbox, mboxAlice, context2);

        repoConn.add(context2, publisher, nameAlice);



        System.out.println("Repository contains statement: " +

                repoConn.hasStatement(bob, name, nameBob, false));



        System.out.println("Repository contains statement in context1: " +

                repoConn.hasStatement(bob, name, nameBob, false, context1));



        System.out.println("Repository contains statement in context2: " +

                repoConn.hasStatement(bob, name, nameBob, false, context2));



        System.out.println("Check handling of getStatements without context IDs:");

        result = repoConn.getStatements(bob, name, null, false);

        try {

            while (result.hasNext()) {

                Statement st = result.next();

                System.out.print(st.getSubject());

                System.out.print(", " + st.getPredicate());

                System.out.print(", " + st.getObject().stringValue());

                System.out.println(", " + st.getContext());

            }

        } finally {

            result.close();

        }



        System.out.println("Check handling of getStatements with a known context ID:");

        result = repoConn.getStatements(null, null, null, false, context1);

        try {

            while (result.hasNext()) {

                Statement st = result.next();

                System.out.print(st.getSubject());

                System.out.print(", " + st.getPredicate());

                System.out.print(", " + st.getObject().stringValue());

                System.out.println(", " + st.getContext());

            }

        } finally {

            result.close();

        }

        

        System.out.println("Get statements with either no context or context2:");

        CloseableIteration<? extends Statement, RepositoryException> iter = repoConn

                .getStatements(null, null, null, false, null, context2);



        try {

            while (iter.hasNext()) {

                Statement st = iter.next();

                System.out.print(st.getSubject());

                System.out.print(", " + st.getPredicate());

                System.out.print(", " + st.getObject().stringValue());

                System.out.println(", " + st.getContext());

            }

        } finally {

            iter.close();

        }



        System.out.println("Get all statements with context1 or context2:");

        iter = repoConn.getStatements(null, null, null, false, context1,

                context2);



        try {

            while (iter.hasNext()) {

                Statement st = iter.next();

                System.out.print(st.getSubject());

                System.out.print(", " + st.getPredicate());

                System.out.print(", " + st.getObject().stringValue());

                System.out.println(", " + st.getContext());

            }

        } finally {

            iter.close();

        }

        

        // Close the RepositoryConnection and shutdown the Repository

        // Close the store and disconnect from the server

        repoConn.close();

        repo.shutDown();

        ts.closeTripleStore();

        ags.disable();

    }

}
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