Examples of org.openrdf.rio.RDFHandler

org.openrdf.rio.RDFHandler
An interface defining methods related to RDF data handling. RDFHandler is both used as a "consumer" and as a "producer" interface. As such it can be used both as an interface for receiving RDF data, for example by listening to the results of an RDF parser, and as an interface for reporting RDF data, for example to an object that serializes RDF data to an RDF/XML document.

    // convenience methods, may be moved ///////////////////////////////////////


    public void dump(final OutputStream out) throws RepositoryException, RDFHandlerException {
        RDFFormat format = RDFFormat.TRIG;
        LOGGER.info("dumping triple store in format " + format.getName() + " to output stream");
        RDFHandler h = Rio.createWriter(format, out);
        RepositoryConnection rc = getRepository().getConnection();
        try {
            rc.begin();
            rc.export(h);
        } finally {

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    public void dumpToFile(final File file,
                           final RDFFormat format) throws IOException, RepositoryException, RDFHandlerException {
        LOGGER.info("dumping triple store in format " + format.getName() + " to file: " + file);
        OutputStream out = new FileOutputStream(file);
        try {
            RDFHandler h = Rio.createWriter(format, out);
            RepositoryConnection rc = getRepository().getConnection();
            try {
                rc.export(h);
            } finally {
                rc.close();

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        LOGGER.info("dumping compressed triple store in format " + format.getName() + " to file: " + file);
        OutputStream out = new FileOutputStream(file);
        try {
            OutputStream gzipOut = new GZIPOutputStream(out);
            try {
                RDFHandler h = Rio.createWriter(format, gzipOut);
                RepositoryConnection rc = getRepository().getConnection();
                try {
                    rc.export(h);
                } finally {
                    rc.close();

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            RepositoryConnection con = response.getTriples().getConnection();
            con.begin();


            ByteArrayOutputStream out = new ByteArrayOutputStream();
            RDFHandler handler = new RDFXMLPrettyWriter(out);
            con.export(handler);


            con.commit();
            con.close();

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            RDFBuffer buffer = new RDFBuffer(adder);


            // Note: any context information in the source document is discarded.
            RDFSink pipe = new SingleContextPipe(buffer, valueFactory.createURI(graphUri), valueFactory);


            RDFHandler handler = new SesameInputAdapter(useBlankNodes
                    ? pipe
                    : new BNodeToURIFilter(pipe, valueFactory));


            InputStream is;
            try {

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                sail.shutDown();
            }


            RepositoryConnection rc = repo.getConnection();
            try {
                rc.export(new RDFHandler() {
                    public void startRDF() throws RDFHandlerException {
                    }


                    public void endRDF() throws RDFHandlerException {
                    }

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      // test export and handlers
      File f = new File("results.n3.txt");
      try {
        ok = true;
        log("Writing the statements to file: (" + f.getAbsolutePath() + ")");
        RDFHandler ntw = new NTriplesWriter(new FileOutputStream(f));
        con.exportStatements(kingsleyidehen, name, null, false, ntw);
      }
      catch (Exception e) {
        log("Error[" + e + "]");
        e.printStackTrace();

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      // test export and handlers
      File f = new File("results.n3.txt");
      try {
        ok = true;
        log("Writing the statements to file: (" + f.getAbsolutePath() + ")");
        RDFHandler ntw = new NTriplesWriter(new FileOutputStream(f));
        con.exportStatements(kingsleyidehen, name, null, false, ntw);
      }
      catch (Exception e) {
        log("Error[" + e + "]");
        e.printStackTrace();

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    client.deleteConcept(testTopic);
  }


  private void writeModel(Model model, RDFFormat format, OutputStream out) throws RDFHandlerException {


    final RDFHandler writer = new BufferedGroupingRDFHandler(Rio.createWriter(format, out));
    writer.startRDF();
    writer.handleNamespace("rdf", RDF.NAMESPACE);
    writer.handleNamespace("rdfs", RDFS.NAMESPACE);
    writer.handleNamespace("skos", SKOS.NAMESPACE);
    writer.handleNamespace("dc", DC.NAMESPACE);
    writer.handleNamespace("primal", PRIMAL.NAMESPACE);


    for (final Statement st : model) {
      writer.handleStatement(st);
    }
    writer.endRDF();
  }

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