Examples of org.openrdf.model.BNode

org.openrdf.model.BNode
A blank node (aka bnode, aka anonymous node). A blank node has an identifier to be able to compare it to other blank nodes internally. Please note that, conceptually, blank node equality can only be determined by examining the statements that refer to them.

      // Empty list
      read();
      return RDF.NIL;
    }
    else {
      BNode listRoot = createBNode();


      // Remember current subject and predicate
      Resource oldSubject = subject;
      URI oldPredicate = predicate;


      // generated bNode becomes subject, predicate becomes rdf:first
      subject = listRoot;
      predicate = RDF.FIRST;


      parseObject();


      BNode bNode = listRoot;


      while (skipWSC() != ')') {
        // Create another list node and link it to the previous
        BNode newNode = createBNode();
        reportStatement(bNode, RDF.REST, newNode);


        // New node becomes the current
        subject = bNode = newNode;

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  protected Resource parseImplicitBlank()
    throws IOException, RDFParseException, RDFHandlerException
  {
    verifyCharacter(read(), "[");


    BNode bNode = createBNode();


    int c = read();
    if (c != ']') {
      unread(c);

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  public BNode createBNode() {
    if (queue == null) {
      throw new UnsupportedOperationException();
    }
    synchronized (queue) {
      BNode bnode = queue.poll();
      if (bnode != null) {
        return bnode;
      }
      try {
        return loadBNodes();

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  }


  private BNode loadBNodes()
    throws StoreException, QueryResultParseException, NoCompatibleMediaType
  {
    BNode bnode;
    TupleResult result = client.post(amount *= 2);
    try {
      if (!result.hasNext()) {
        throw new StoreException("No BNodes");
      }

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    return memBNode;
  }


  @Override
  public synchronized BNode createBNode(String nodeID) {
    BNode tempBNode = new BNodeImpl(nodeID);
    MemBNode memBNode = getMemBNode(tempBNode);


    if (memBNode == null) {
      memBNode = createMemBNode(tempBNode);
    }

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  public RdbmsBNode createBNode(String nodeID) {
    RdbmsBNode resource = bnodes.findInCache(nodeID);
    if (resource == null) {
      try {
        BNode impl = vf.createBNode(nodeID);
        resource = new RdbmsBNode(impl);
        bnodes.cache(resource);
      }
      catch (InterruptedException e) {
        throw new RdbmsRuntimeException(e);

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    if (value instanceof URI) {
      URI uri = (URI)value;
      xmlWriter.textElement(URI_TAG, uri.toString());
    }
    else if (value instanceof BNode) {
      BNode bNode = (BNode)value;
      xmlWriter.textElement(BNODE_TAG, bNode.getID());
    }
    else if (value instanceof Literal) {
      Literal literal = (Literal)value;
      URI datatype = literal.getDatatype();

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      NodeElement subject = (NodeElement)peekStack(1);
      PropertyElement predicate = (PropertyElement)peekStack(0);


      if (predicate.parseCollection()) {
        Resource lastListRes = predicate.getLastListResource();
        BNode newListRes = createBNode();


        if (lastListRes == null) {
          // first element in the list
          reportStatement(subject.getResource(), predicate.getURI(), newListRes);

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      }


      String parseTypeValue = parseType.getValue();


      if (parseTypeValue.equals("Resource")) {
        BNode objectResource = createBNode();
        NodeElement subject = (NodeElement)peekStack(1);


        reportStatement(subject.getResource(), propURI, objectResource);


        if (isEmptyElt) {

View Full Code Here


        // Write new subject:
        writeNewLine();
        writeStartOfStartTag(RDF.NAMESPACE, "Description");
        if (subj instanceof BNode) {
          BNode bNode = (BNode)subj;
          writeAttribute(RDF.NAMESPACE, "nodeID", bNode.getID());
        }
        else {
          URI uri = (URI)subj;
          writeAttribute(RDF.NAMESPACE, "about", uri.toString());
        }
        writeEndOfStartTag();
        writeNewLine();


        lastWrittenSubject = subj;
      }


      // PREDICATE
      writeIndent();
      writeStartOfStartTag(predNamespace, predLocalName);


      // OBJECT
      if (obj instanceof Resource) {
        Resource objRes = (Resource)obj;


        if (objRes instanceof BNode) {
          BNode bNode = (BNode)objRes;
          writeAttribute(RDF.NAMESPACE, "nodeID", bNode.getID());
        }
        else {
          URI uri = (URI)objRes;
          writeAttribute(RDF.NAMESPACE, "resource", uri.toString());
        }

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