public static Node iri(Node nv, String baseIRI) {
if (nv.isURI()) return nv;
if (nv.isBlank()) {
// Skolemization of blank nodes to IRIs : Don't ask, just don't ask.
String x = nv.getBlankNodeLabel();
return Node.createURI("_:" + x);
}
if (nv.isLiteral() && nv.getLiteralDatatype() == null && nv.getLiteralLanguage().equals("")) {
// Plain literal
IRI iri = null;
String iriStr = nv.getLiteralLexicalForm();
// Level of checking?
if (baseIRI != null) {
IRI base = iriFactory.create(baseIRI);
iri = base.create(iriStr);
} else iri = iriFactory.create(iriStr);
if (!iri.isAbsolute()) throw new ExprEvalException("Relative IRI string: " + iriStr);
if (warningsForIRIs && iri.hasViolation(false)) {
String msg = "unknown violation from IRI library";
Iterator<Violation> iter = iri.violations(false);
if (iter.hasNext()) {
Violation viol = iter.next();
msg = viol.getShortMessage();
}
Log.warn(NodeFunctions.class, "Bad IRI: " + msg + ": " + iri);
}
return Node.createURI(iri.toString());
}
throw new ExprEvalException("Can't make an IRI from " + nv);
}
/** Encoding of a node so it can be reconstructed */
public static String serialize(Node n, String base, PrefixMap prefixMap) {
// See also Nodec.
// See also OutputLangUtils - merge and this is a buffering call.
if (n == null) return "<<null>>";
if (n.isBlank()) {
String str = n.getBlankNodeLabel();
// c.f. OutputLangUtils
if (onlySafeBNodeLabels) str = safeBNodeLabel(str);
return "_:" + str;
}
if (n.isLiteral()) return FmtUtils.stringForLiteral((Node_Literal) n, null);
if (n.isURI()) {
String uri = n.getURI();
return stringForURI(uri, base, prefixMap);
}
// Safe name?
if (n.isVariable()) return "?" + n.getName();
//
// if ( n.equals(Node.ANY) )
// return "ANY" ;
throw new TDBException("Failed to turn a node into a string: " + n);
// return null ;
}
protected static String sparqlNodeUpdate(Node node, String varName) {
if (node.isBlank()) {
return "_:" + node.getBlankNodeLabel().replaceAll("\\W", "");
} else {
return sparqlNode(node, varName);
}
}
/**
* Map a Jena graph node to a Mulgara value.
*
* @param x The Jena Node to convert.
* @param session A session to use for blank node persistence.
* @return A Mulgara Value.
* @throws URISyntaxException When creating a URIReference that refers to an invalid URI.
*/
static Value n2v(Node x, Session session) throws URISyntaxException {
if (x.isURI()) return new URIReferenceImpl(new URI(x.getURI()));
if (x.isLiteral()) {
// The return types are Mulgara LiteralImpl
if (x.getLiteralDatatypeURI() != null) {
return new LiteralImpl(x.getLiteralLexicalForm(), new URI(x.getLiteralDatatypeURI()));
}
if (x.getLiteralLanguage() != null) {
return new LiteralImpl(x.getLiteralLexicalForm(), x.getLiteralLanguage());
}
return new LiteralImpl(x.getLiteralLexicalForm());
}
if (x.isBlank()) {
// is this a previously encountered Jena-allocated node?
Value bn = nodesToValues.get(x);
if (bn != null) return bn;
// May be a Mulgara-allocated bNode (and so we we have seen before)
String blankLabel = x.getBlankNodeLabel();
if (blankLabel.startsWith(LABEL)) {
long id = Long.parseLong(blankLabel.substring(LABEL_LEN));
return new BlankNodeImpl(BlankNodeImpl.counterToNode(id));
}
// It's not - it's a Jena one.
if (skolemizedBlankNodes) {
String skol = bNodeScheme + x.getBlankNodeLabel();
return new URIReferenceImpl(new URI(skol));
}
// Not a Mulgara-allocated bNode. Create a new mapping.
BlankNodeImpl v = new BlankNodeImpl();
nodesToValues.put(x, v);
valuesToNodes.put(v.getNodeId(), x);
return v;
}
throw new RuntimeException("Can't convert from Jena node : " + x);
}
private ResultSetRewindable convertToStrings(ResultSetRewindable resultsActual) {
List<Binding> bindings = new ArrayList<Binding>();
while (resultsActual.hasNext()) {
Binding b = resultsActual.nextBinding();
BindingMap b2 = BindingFactory.create();
for (String vn : resultsActual.getResultVars()) {
Var v = Var.alloc(vn);
Node n = b.get(v);
String s;
if (n == null) s = "";
else if (n.isBlank()) s = "_:" + n.getBlankNodeLabel();
else s = NodeFunctions.str(n);
b2.add(v, NodeFactory.createLiteral(s));
}
bindings.add(b2);
}
ResultSet rs =
new ResultSetStream(
resultsActual.getResultVars(), null, new QueryIterPlainWrapper(bindings.iterator()));
return ResultSetFactory.makeRewindable(rs);
}
@Test
public void shouldUsetheBNodeIdIfItIsABNode() {
final DatasetGraph mem = createMem();
final Node anon = createAnon();
assertEquals(anon.getBlankNodeLabel(), testObj.getObjectTitle(mem, anon));
}
