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.

      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) {

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        // subjects are not bNodes and don't match
        return false;
      }
    }
    else { // subj1 instanceof BNode
      BNode mappedBNode = bNodeMapping.get(subj1);


      if (mappedBNode != null) {
        // bNode 'subj1' was already mapped to some other bNode
        if (!subj2.equals(mappedBNode)) {
          // 'subj1' and 'subj2' do not match
          return false;
        }
      }
      else {
        // 'subj1' was not yet mapped. we need to check if 'subj2' is a
        // possible mapping candidate
        if (bNodeMapping.containsValue(subj2)) {
          // 'subj2' is already mapped to some other value.
          return false;
        }
      }
    }


    Value obj1 = st1.getObject();
    Value obj2 = st2.getObject();


    if (!(obj1 instanceof BNode)) {
      if (!obj1.equals(obj2)) {
        // objects are not bNodes and don't match
        return false;
      }
    }
    else { // obj1 instanceof BNode
      BNode mappedBNode = bNodeMapping.get(obj1);


      if (mappedBNode != null) {
        // bNode 'obj1' was already mapped to some other bNode
        if (!obj2.equals(mappedBNode)) {
          // 'obj1' and 'obj2' do not match

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   * everytime.
   * 
   * @throws RepositoryException
   */
  private BNode mapBNode(BNode bNode) {
    BNode result = bNodesMap.get(bNode.getID());


    if (result == null) {
      result = con.getRepository().getValueFactory().createBNode();
      bNodesMap.put(bNode.getID(), result);
    }

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        // subjects are not bNodes and don't match
        return false;
      }
    }
    else { // subj1 instanceof BNode
      BNode mappedBNode = bNodeMapping.get(subj1);


      if (mappedBNode != null) {
        // bNode 'subj1' was already mapped to some other bNode
        if (!subj2.equals(mappedBNode)) {
          // 'subj1' and 'subj2' do not match
          return false;
        }
      }
      else {
        // 'subj1' was not yet mapped. we need to check if 'subj2' is a
        // possible mapping candidate
        if (bNodeMapping.containsValue(subj2)) {
          // 'subj2' is already mapped to some other value.
          return false;
        }
      }
    }


    Value obj1 = st1.getObject();
    Value obj2 = st2.getObject();


    if (!(obj1 instanceof BNode)) {
      if (!obj1.equals(obj2)) {
        // objects are not bNodes and don't match
        return false;
      }
    }
    else { // obj1 instanceof BNode
      BNode mappedBNode = bNodeMapping.get(obj1);


      if (mappedBNode != null) {
        // bNode 'obj1' was already mapped to some other bNode
        if (!obj2.equals(mappedBNode)) {
          // 'obj1' and 'obj2' do not match

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  }


  public void export(Graph graph) {
    ValueFactory vf = graph.getValueFactory();


    BNode repositoryNode = vf.createBNode();


    graph.add(repositoryNode, RDF.TYPE, REPOSITORY);


    if (id != null) {
      graph.add(repositoryNode, REPOSITORYID, vf.createLiteral(id));

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        // 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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    model2.add(VF.createStatement(foo, RDF.TYPE, VF.createBNode()));


    assertTrue(ModelUtil.equals(model1, model2));


    // chained bnodes
    BNode chainedNode1 = VF.createBNode();


    model1.add(VF.createStatement(bar, RDFS.SUBCLASSOF, chainedNode1));
    model1.add(VF.createStatement(chainedNode1, RDFS.SUBCLASSOF, foo));


    BNode chainedNode2 = VF.createBNode();


    model2.add(VF.createStatement(bar, RDFS.SUBCLASSOF, chainedNode2));
    model2.add(VF.createStatement(chainedNode2, RDFS.SUBCLASSOF, foo));


    assertTrue(ModelUtil.equals(model1, model2));

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    assertTrue(ModelUtil.isSubset(model1, model2));
    assertTrue(ModelUtil.isSubset(model2, model1));


    // chained bnodes
    BNode chainedNode1 = VF.createBNode();


    model1.add(VF.createStatement(bar, RDFS.SUBCLASSOF, chainedNode1));
    model1.add(VF.createStatement(chainedNode1, RDFS.SUBCLASSOF, foo));


    assertFalse(ModelUtil.isSubset(model1, model2));
    assertTrue(ModelUtil.isSubset(model2, model1));


    BNode chainedNode2 = VF.createBNode();


    model2.add(VF.createStatement(bar, RDFS.SUBCLASSOF, chainedNode2));
    model2.add(VF.createStatement(chainedNode2, RDFS.SUBCLASSOF, foo));


    assertTrue(ModelUtil.isSubset(model1, model2));

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  }


  public void testValueRoundTrip2()
    throws Exception
  {
    BNode subj = new BNodeImpl("foo");
    URI pred = new URIImpl(EXAMPLE_NS + PAINTS);
    URI obj = new URIImpl(EXAMPLE_NS + GUERNICA);


    testValueRoundTrip(subj, pred, obj);
  }

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