AGRepositoryAdd.java

package com.franz.ag.repository.examples;

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

import java.io.FileInputStream;
import java.io.InputStream;
import java.net.URL;

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;

import org.openrdf.model.Statement;
import org.openrdf.model.ValueFactory;
import org.openrdf.repository.Repository;
import org.openrdf.repository.RepositoryConnection;
import org.openrdf.rio.RDFFormat;

public class AGRepositoryAdd {

    /**
     * Demonstrates various ways of adding data to a repository. 
     * 
     * @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("repositoryadd", AGPaths.TRIPLE_STORES);
        Repository repo = new AGRepository(ts);
        repo.initialize();
        RepositoryConnection repoConn = repo.getConnection();
        
        // Load RDFXML from a URL into the null context
        repoConn.add(new URL("http://www.w3.org/TR/owl-guide/wine.rdf"), "", RDFFormat.RDFXML);
        System.out.println("Loaded " + repoConn.size() + " triples.");
        
        // Get the ValueFactory for the Repository and create some example values. 
        ValueFactory vf = repo.getValueFactory();
        createExampleValues(vf);

        repoConn.add(bob, name, nameBob);
        System.out.println("Check for added statement: " + 
                repoConn.hasStatement(bob, name, nameBob, false));
        
        Statement statement = vf.createStatement(alice, name, nameAlice);
        repoConn.add(statement);

        System.out.println("Check for added statement: " +
                repoConn.hasStatement(statement, false));
        System.out.println("Check for added statement: " +
                repoConn.hasStatement(alice, name, nameAlice, false));

        // Load Ntriples from a local file
        InputStream defaultGraph = new FileInputStream(AGPaths.dataSources("default-graph.nt"));
        try {
            repoConn.add(defaultGraph, "", RDFFormat.NTRIPLES);
        } finally {
            defaultGraph.close();
        }

        System.out.println("Repository contains newly added statements: " +
                repoConn.hasStatement(null, publisher, nameBob, false));
        System.out.println("Repository contains newly added statements: " +
                repoConn.hasStatement(null, publisher, nameAlice, false));

        // add file graph1.nt to context1
        InputStream graph1 = new FileInputStream(AGPaths.dataSources("graph1.nt"));
        try {
            repoConn.add(graph1, "", RDFFormat.NTRIPLES, context1);
        } finally {
            graph1.close();
        }

        // add file graph2.nt to context2
        InputStream graph2 = new FileInputStream(AGPaths.dataSources("graph2.nt"));
        try {
            repoConn.add(graph2, "", RDFFormat.NTRIPLES, context2);
        } finally {
            graph2.close();
        }

        System.out.println("alice is known in context1?: " +
                repoConn.hasStatement(null, name, nameAlice, false, context1));
        System.out.println("alice is known in context2?: " +
                repoConn.hasStatement(null, name, nameAlice, false, context2));

        System.out.println("bob is known in context2?: " +
                repoConn.hasStatement(null, name, nameBob, false, context2));
        System.out.println("bob is known in context1?: " +
                repoConn.hasStatement(null, name, nameBob, false, context1));

        // Shutdown the Repository, close the store and disconnect from the server
        repoConn.close();
        repo.shutDown();
        ts.closeTripleStore();
        ags.disable();
    }
}

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