Examples with QuadWritable org.apache.jena.hadoop.rdf.types.QuadWritable used on opensource projects

Example 11 with QuadWritable

use of org.apache.jena.hadoop.rdf.types.QuadWritable in project jena by apache.

the class HadoopRdfIORegistry method createQuadReader.

/**
     * Tries to create a quad reader for the given language
     * 
     * @param lang
     *            Language
     * @return Quad reader if one is available
     * @throws IOException
     *             Thrown if a quad reader is not available or the given
     *             language does not support quads
     */
public static RecordReader<LongWritable, QuadWritable> createQuadReader(Lang lang) throws IOException {
    if (lang == null)
        throw new IOException("Cannot create a quad reader for an undefined language");
    ReaderFactory f = readerFactories.get(lang);
    if (f == null)
        throw new IOException("No factory registered for language " + lang.getName());
    if (!f.canReadQuads())
        throw new IOException(lang.getName() + " does not support reading quads");
    RecordReader<LongWritable, QuadWritable> reader = f.createQuadReader();
    if (reader == null)
        throw new IOException("Registered factory for " + lang.getName() + " produced a null triples reader");
    return reader;
}

Example 12 with QuadWritable

use of org.apache.jena.hadoop.rdf.types.QuadWritable in project jena by apache.

the class QuadsToTriplesMapperTest method quads_to_triples_mapper_01.

/**
     * Tests quads to triples conversion
     * 
     * @throws IOException
     */
@Test
public void quads_to_triples_mapper_01() throws IOException {
    MapDriver<LongWritable, QuadWritable, LongWritable, TripleWritable> driver = this.getMapDriver();
    Triple t = new Triple(NodeFactory.createURI("http://s"), NodeFactory.createURI("http://p"), NodeFactory.createLiteral("test"));
    Quad q = new Quad(Quad.defaultGraphNodeGenerated, t);
    driver.withInput(new Pair<LongWritable, QuadWritable>(new LongWritable(1), new QuadWritable(q))).withOutput(new Pair<LongWritable, TripleWritable>(new LongWritable(1), new TripleWritable(t)));
    driver.runTest();
}

Example 13 with QuadWritable

use of org.apache.jena.hadoop.rdf.types.QuadWritable in project jena by apache.

the class TriplesToQuadsBySubjectMapperTest method generateData.

protected void generateData(MapDriver<LongWritable, TripleWritable, LongWritable, QuadWritable> driver, int num) {
    for (int i = 0; i < num; i++) {
        Triple t = new Triple(NodeFactory.createURI("http://subjects/" + i), NodeFactory.createURI("http://predicate"), NodeFactory.createLiteral(Integer.toString(i), XSDDatatype.XSDinteger));
        Quad q = new Quad(t.getSubject(), t);
        driver.addInput(new LongWritable(i), new TripleWritable(t));
        driver.addOutput(new LongWritable(i), new QuadWritable(q));
    }
}

Example 14 with QuadWritable

use of org.apache.jena.hadoop.rdf.types.QuadWritable in project jena by apache.

the class TriplesToQuadsConstantGraphMapperTest method triples_to_quads_mapper_01.

/**
     * Tests quads to triples conversion
     * 
     * @throws IOException
     */
@Test
public void triples_to_quads_mapper_01() throws IOException {
    MapDriver<LongWritable, TripleWritable, LongWritable, QuadWritable> driver = this.getMapDriver();
    Triple t = new Triple(NodeFactory.createURI("http://s"), NodeFactory.createURI("http://p"), NodeFactory.createLiteral("test"));
    Quad q = new Quad(Quad.defaultGraphNodeGenerated, t);
    driver.withInput(new Pair<LongWritable, TripleWritable>(new LongWritable(1), new TripleWritable(t))).withOutput(new Pair<LongWritable, QuadWritable>(new LongWritable(1), new QuadWritable(q)));
    driver.runTest();
}

Example 15 with QuadWritable

use of org.apache.jena.hadoop.rdf.types.QuadWritable in project jena by apache.

the class QuadsToTriplesMapperTest method generateData.

protected void generateData(MapDriver<LongWritable, QuadWritable, LongWritable, TripleWritable> driver, int num) {
    for (int i = 0; i < num; i++) {
        Triple t = new Triple(NodeFactory.createURI("http://subjects/" + i), NodeFactory.createURI("http://predicate"), NodeFactory.createLiteral(Integer.toString(i), XSDDatatype.XSDinteger));
        Quad q = new Quad(Quad.defaultGraphNodeGenerated, t);
        driver.addInput(new LongWritable(i), new QuadWritable(q));
        driver.addOutput(new LongWritable(i), new TripleWritable(t));
    }
}