Examples with Statement org.eclipse.rdf4j.model.Statement used on opensource projects

Example 6 with Statement

use of org.eclipse.rdf4j.model.Statement in project rdf4j by eclipse.

the class ArrangedWriter method getUsedNamespaces.

private void getUsedNamespaces(Set<Statement> stmts, Set<String> used) {
    for (Statement st : stmts) {
        used.add(st.getPredicate().getNamespace());
        if (st.getObject() instanceof IRI) {
            IRI uri = (IRI) st.getObject();
            used.add(uri.getNamespace());
        } else if (st.getObject() instanceof Literal) {
            Literal lit = (Literal) st.getObject();
            if (lit.getDatatype() != null) {
                used.add(lit.getDatatype().getNamespace());
            }
        }
    }
}

Example 7 with Statement

use of org.eclipse.rdf4j.model.Statement in project rdf4j by eclipse.

the class ArrangedWriter method flushStatements.

private synchronized void flushStatements() throws RDFHandlerException {
    if (!stmtBySubject.isEmpty() || !blanks.isEmpty()) {
        flushNamespaces();
        Statement st;
        while ((st = nextStatement()) != null) {
            delegate.handleStatement(st);
        }
        assert queueSize == 0;
    }
}

Example 8 with Statement

use of org.eclipse.rdf4j.model.Statement in project rdf4j by eclipse.

the class ArrangedWriter method queueBlankStatements.

private synchronized Set<Statement> queueBlankStatements(SubjectInContext key) {
    Model firstMatch = blanks.filter(key.getSubject(), null, null, key.getContext());
    Model matches = firstMatch.isEmpty() ? blankReferences.filter(key.getSubject(), null, null, key.getContext()) : firstMatch;
    if (matches.isEmpty()) {
        return null;
    }
    Set<Statement> set = stmtBySubject.get(key);
    if (set == null) {
        stmtBySubject.put(key, set = new TreeSet<Statement>(comparator));
    }
    set.addAll(matches);
    if (firstMatch.isEmpty()) {
        // repeat blank node values
        queueSize += matches.size();
    } else {
        if (repeatBlankNodes && key.getSubject() instanceof BNode && isStillReferenced(key)) {
            blankReferences.addAll(matches);
        }
        blanks.remove(key.getSubject(), null, null, key.getContext());
    }
    return set;
}

Example 9 with Statement

use of org.eclipse.rdf4j.model.Statement in project rdf4j by eclipse.

the class TestTurtleParser method rdfXmlLoadedFromInsideAJarResolvesRelativeUris.

@Test
public void rdfXmlLoadedFromInsideAJarResolvesRelativeUris() throws Exception {
    URL zipfileUrl = TestTurtleParser.class.getResource("sample-with-turtle-data.zip");
    assertNotNull("The sample-with-turtle-data.zip file must be present for this test", zipfileUrl);
    String url = "jar:" + zipfileUrl + "!/index.ttl";
    RDFParser parser = new TurtleParser();
    StatementCollector sc = new StatementCollector();
    parser.setRDFHandler(sc);
    InputStream in = new URL(url).openStream();
    parser.parse(in, url);
    in.close();
    Collection<Statement> stmts = sc.getStatements();
    assertThat(stmts, Matchers.<Statement>iterableWithSize(2));
    Iterator<Statement> iter = stmts.iterator();
    Statement stmt1 = iter.next(), stmt2 = iter.next();
    assertEquals(vf.createIRI("http://www.example.com/#"), stmt1.getSubject());
    assertEquals(vf.createIRI("http://www.example.com/ns/#document-about"), stmt1.getPredicate());
    Resource res = (Resource) stmt1.getObject();
    String resourceUrl = res.stringValue();
    assertThat(resourceUrl, CoreMatchers.startsWith("jar:" + zipfileUrl + "!"));
    URL javaUrl = new URL(resourceUrl);
    assertEquals("jar", javaUrl.getProtocol());
    InputStream uc = javaUrl.openStream();
    assertEquals("The resource stream should be empty", -1, uc.read());
    uc.close();
    assertEquals(res, stmt2.getSubject());
    assertEquals(DC.TITLE, stmt2.getPredicate());
    assertEquals(vf.createLiteral("Empty File"), stmt2.getObject());
}

Example 10 with Statement

use of org.eclipse.rdf4j.model.Statement in project rdf4j by eclipse.

the class QueryResults method report.

/**
 * Reports a graph query result to an {@link RDFHandler}. <br>
 * The {@link GraphQueryResult#close()} method will always be called before this method returns.<br>
 * If there is an exception generated by the GraphQueryResult, {@link RDFHandler#endRDF()} will not be
 * called.
 *
 * @param gqr
 *        The query result to report.
 * @param rdfHandler
 *        The handler to report the query result to.
 * @throws RDFHandlerException
 *         If such an exception is thrown by the used RDF writer.
 * @throws QueryEvaluationException
 */
public static void report(GraphQueryResult gqr, RDFHandler rdfHandler) throws RDFHandlerException, QueryEvaluationException {
    try {
        rdfHandler.startRDF();
        for (Map.Entry<String, String> entry : gqr.getNamespaces().entrySet()) {
            String prefix = entry.getKey();
            String namespace = entry.getValue();
            rdfHandler.handleNamespace(prefix, namespace);
        }
        while (gqr.hasNext()) {
            Statement st = gqr.next();
            rdfHandler.handleStatement(st);
        }
    } finally {
        gqr.close();
    }
    rdfHandler.endRDF();
}