Examples with StreamRDF org.apache.jena.riot.system.StreamRDF used on opensource projects

Example 16 with StreamRDF

use of org.apache.jena.riot.system.StreamRDF in project jena by apache.

the class SPARQL_GSP_RW method addDataIntoTxn.

/** Directly add data in a transaction.
     * Assumes recovery from parse errors by transaction abort.
     * Return whether the target existed before.
     * @param action
     * @param cleanDest Whether to remove data first (true = PUT, false = POST)
     * @return whether the target existed beforehand
     */
protected static UploadDetails addDataIntoTxn(HttpAction action, boolean overwrite) {
    action.beginWrite();
    try {
        Target target = determineTarget(action);
        if (action.log.isDebugEnabled())
            action.log.debug(action.request.getMethod().toUpperCase() + "->" + target);
        boolean existedBefore = target.exists();
        Graph g = target.graph();
        if (overwrite && existedBefore)
            clearGraph(target);
        StreamRDF sink = StreamRDFLib.graph(g);
        UploadDetails upload = Upload.incomingData(action, sink);
        upload.setExistedBefore(existedBefore);
        action.commit();
        return upload;
    } catch (RiotException ex) {
        // Parse error
        action.abort();
        ServletOps.errorBadRequest(ex.getMessage());
        return null;
    } catch (Exception ex) {
        // Something else went wrong.  Backout.
        action.abort();
        ServletOps.errorOccurred(ex.getMessage());
        return null;
    } finally {
        action.endWrite();
    }
}

Example 17 with StreamRDF

use of org.apache.jena.riot.system.StreamRDF in project jena by apache.

the class ExRIOT_2 method main.

public static void main(String... argv) throws IOException {
    // ---- Parse to a Sink.
    StreamRDF noWhere = StreamRDFLib.sinkNull();
    // --- Or create a parser and do the parsing with detailed setup.
    String baseURI = "http://example/base";
    // The parsers will do the necessary character set conversion.  
    try (InputStream in = new FileInputStream("data.trig")) {
        RDFParser.create().source(in).lang(RDFLanguages.TRIG).errorHandler(ErrorHandlerFactory.errorHandlerStrict).base("http://example/base").parse(noWhere);
    }
}

Example 18 with StreamRDF

use of org.apache.jena.riot.system.StreamRDF in project jena by apache.

the class ExRIOT_4 method main.

public static void main(String... argv) {
    String filename = "data.ttl";
    // This is the heart of N-triples printing ... outoput is heavily buffered
    // so the FilterSinkRDF called flush at the end of parsing.
    Sink<Triple> output = new SinkTripleOutput(System.out, null, SyntaxLabels.createNodeToLabel());
    StreamRDF filtered = new FilterSinkRDF(output, FOAF.name, FOAF.knows);
    // Call the parsing process.
    RDFParser.source(filename).parse(filtered);
}

Example 19 with StreamRDF

use of org.apache.jena.riot.system.StreamRDF in project jena by apache.

the class WriterGraphThrift method write.

@Override
public void write(OutputStream out, Graph graph, PrefixMap prefixMap, String baseURI, Context context) {
    StreamRDF stream = BinRDF.streamToOutputStream(out, withValues);
    stream.start();
    StreamOps.graphToStream(graph, stream);
    stream.finish();
}

Example 20 with StreamRDF

use of org.apache.jena.riot.system.StreamRDF in project jena by apache.

the class NTriplesWriter method write.

@Override
public void write(Writer out, Graph graph, PrefixMap prefixMap, String baseURI, Context context) {
    Iterator<Triple> iter = graph.find(null, null, null);
    if (charSpace == UTF8)
        write(out, iter);
    else {
        StreamRDF s = new WriterStreamRDFPlain(IO.wrap(out), ASCII);
        write$(s, iter);
    }
}