Examples of com.hp.hpl.jena.rdf.model.NodeIterator

com.hp.hpl.jena.rdf.model.NodeIterator
An iterator which returns RDF nodes.
RDF iterators are standard Java iterators, except that they have an extra method that returns specifically typed objects, in this case RDF nodes, and have a close() method. thatshould be called to free resources if the application does not complete the iteration.


  }


  public void testObjectsOfPropertyAndValue()
  {
    NodeIterator iter;
    final boolean[] object = new boolean[num];
    final Resource subj = model.createResource();
    for (int i = 0; i < num; i++)
    {
      model.addLiteral(subj, RDF.value, i);
      object[i] = false;
    }


    iter = model.listObjectsOfProperty(subj, RDF.value);
    while (iter.hasNext())
    {
      final int i = ((Literal) iter.nextNode()).getInt();
      object[i] = true;
    }
    for (int i = 0; i < (num); i++)
    {
      Assert.assertTrue(object[i]);

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    super(modelFactory, name);
  }


  protected void checkNumericContent( final Container cont2, final int num )
  {
    final NodeIterator nit = cont2.iterator();
    for (int i = 0; i < num; i += 1)
    {
      Assert.assertEquals(i, ((Literal) nit.nextNode()).getInt());
    }
    Assert.assertFalse(nit.hasNext());
  }

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  }


  protected void retainOnlySpecified( final Container cont2, final int num,
      final boolean[] retain )
  {
    final NodeIterator nit = cont2.iterator();
    for (int i = 0; i < num; i++)
    {
      nit.nextNode();
      if (retain[i] == false)
      {
        nit.remove();
      }
    }
    Assert.assertFalse(nit.hasNext());
  }

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    Assert.assertFalse(nit.hasNext());
  }


  protected void seeWhatsThere( final Container cont2, final boolean[] found )
  {
    final NodeIterator nit = cont2.iterator();
    while (nit.hasNext())
    {
      final int v = ((Literal) nit.nextNode()).getInt();
      Assert.assertFalse(found[v]);
      found[v] = true;
    }
  }

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  public void testListObjectsNoRemove()
  {
    final Model m = ModelHelper.modelWithStatements(this,
        "a P b; b Q c; c R a");
    final NodeIterator it = m.listObjects();
    it.next();
    try
    {
      it.remove();
      Assert.fail("listObjects should not support .remove()");
    }
    catch (final UnsupportedOperationException e)
    {
      JenaTestBase.pass();

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        Iterator<RDFNode> iter = new Map1Iterator<HitLARQ, RDFNode>(converter, search(queryString)) ;
        if ( scoreLimit > 0 )
            iter = new IteratorTruncate<RDFNode>(new ScoreTest(scoreLimit), iter) ;
        
        NodeIterator nIter = new NodeIteratorImpl(iter, null) ; 
        return nIter ;
    }

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                    Resource b = m.createResource( "http://foo/bar#b" );
                    OntProperty p = m.createOntProperty( "http://foo/bar#p" );
                    Literal l = m.createTypedLiteral( false );
                    m.add( a, p, b );
                    m.add( a, p, l );
                    NodeIterator ni = a.listPropertyValues( p );


                    while (ni.hasNext()) {
                        RDFNode n = ni.nextNode();
                        if (n.isResource()) {
                            assertEquals( b, n );
                            assertTrue( "Return value should be an OntResource", n instanceof OntResource );
                        }
                    }

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    }
  }


  public Set<IDoapCategory> getAll() throws SimalRepositoryException {
    Model model = ((JenaSimalRepository) getRepository()).getModel();
      NodeIterator itr = model.listObjectsOfProperty(Doap.CATEGORY);
      Set<IDoapCategory> categories = new HashSet<IDoapCategory>();
      while (itr.hasNext()) {
        String uri = itr.nextNode().toString();
        categories.add(new Category(model.getResource(uri)));
      }
      return categories;
  }

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