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.


    @Test public void test_index_literal_4()
    { 
        Model model = ModelFactory.createDefaultModel() ;
        IndexLARQ index = TestLARQUtils.createIndex(model, datafile, new IndexBuilderString(DC.title)) ; 
        NodeIterator nIter = index.searchModelByIndex(model, "+document") ;
        // Search both DC title and RDFS label
        for ( ; nIter.hasNext(); )
        {
            RDFNode n = nIter.nextNode() ;
            assertTrue(n instanceof Literal) ;
            assertTrue(model.contains(null, DC.title, n)) ;
            assertFalse(model.contains(null, RDFS.label, n)) ;
        }
    }

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    @Test public void test_index_subject_1()
    { 
        Model model = ModelFactory.createDefaultModel() ;
        IndexLARQ index = TestLARQUtils.createIndex(model, datafile, new IndexBuilderSubject()) ; 
        NodeIterator nIter = index.searchModelByIndex(model, "+document") ;
        // Search both DC title and RDFS label
        assertEquals(3,TestLARQUtils.count(nIter)) ;
    }

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    @Test public void test_index_subject_2()
    { 
        Model model = ModelFactory.createDefaultModel() ;
        IndexLARQ index = TestLARQUtils.createIndex(model, datafile, new IndexBuilderSubject(DC.title)) ; 
        NodeIterator nIter = index.searchModelByIndex(model, "+document") ;
        // Search both DC title and RDFS label
        assertEquals(2,TestLARQUtils.count(nIter)) ;
    }

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    @Test public void test_index_subject_3()
    { 
        Model model = ModelFactory.createDefaultModel() ;
        IndexLARQ index = TestLARQUtils.createIndex(model, datafile, new IndexBuilderSubject()) ; 
        NodeIterator nIter = index.searchModelByIndex(model, "+document") ;
        // Search both DC title and RDFS label
        for ( ; nIter.hasNext(); )
        {
            RDFNode n = nIter.nextNode() ;
            assertTrue(n instanceof Resource) ;
            assertTrue(model.contains((Resource)n, null, (RDFNode)null)) ;
            boolean b = model.contains((Resource)n, DC.title, (RDFNode)null) ||
                        model.contains((Resource)n, RDFS.label, (RDFNode)null) ;
            assertTrue("subject with DC.title or RDFS.label", b) ;

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    @Test public void test_index_subject_4()
    { 
        Model model = ModelFactory.createDefaultModel() ;
        IndexLARQ index = TestLARQUtils.createIndex(model, datafile, new IndexBuilderSubject(DC.title)) ; 
        NodeIterator nIter = index.searchModelByIndex(model, "+document") ;
        for ( ; nIter.hasNext(); )
        {
            RDFNode n = nIter.nextNode() ;
            assertTrue(n instanceof Resource) ;
            assertTrue(model.contains((Resource)n, null, (RDFNode)null)) ;
            assertTrue(model.contains((Resource)n, DC.title, (RDFNode)null)) ;
        }
    }

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        b.index(r, "foo") ;
        b.index(r, "foo") ;
        b.closeWriter();


        IndexLARQ index = b.getIndex() ;
        NodeIterator nIter = index.searchModelByIndex("foo") ;
        if ( b.avoidDuplicates() ) {
            assertEquals(1, TestLARQUtils.count(nIter)) ;
        } else {
            assertEquals(2, TestLARQUtils.count(nIter)) ;
        }

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        model.add(model.createResource("http://example/r"), RDFS.label, "foo");
        model.add(model.createResource("http://example/r"), RDFS.label, "foo");
        indexBuilder.closeWriter() ;


        IndexLARQ index = indexBuilder.getIndex() ;
        NodeIterator nIter = index.searchModelByIndex("foo") ;
        if ( indexBuilder.avoidDuplicates() ) {
            assertEquals(1, TestLARQUtils.count(nIter)) ;
        } else {
            assertEquals(2, TestLARQUtils.count(nIter)) ;
        }

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        b.index(r2, "foo") ;
        b.index(r2, "bar") ;
        b.closeWriter();


        IndexLARQ index = b.getIndex() ;
        NodeIterator nIter = index.searchModelByIndex("foo") ;
        if ( b.avoidDuplicates() ) {
            assertEquals(2, TestLARQUtils.count(nIter)) ;
        } else {
            assertEquals(4, TestLARQUtils.count(nIter)) ;
        }

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        model.add(model.createResource(), RDFS.label, "foo");
        model.add(model.createResource(), RDFS.label, "foo");
        indexBuilder.closeWriter() ;
        
        IndexLARQ index = indexBuilder.getIndex() ;
        NodeIterator nIter = index.searchModelByIndex("foo") ;
        if ( indexBuilder.avoidDuplicates() ) {
            assertEquals(1, TestLARQUtils.count(nIter)) ;
        } else { 
            assertEquals(2, TestLARQUtils.count(nIter)) ;
        }

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        indexBuilder.index(blank, "foo");
        indexBuilder.index(blank, "bar");
        indexBuilder.closeWriter() ;
        
        IndexLARQ index = indexBuilder.getIndex() ;
        NodeIterator nIter = index.searchModelByIndex("foo") ;
        if ( indexBuilder.avoidDuplicates() ) {
            assertEquals(1, TestLARQUtils.count(nIter)) ;
        } else {
            assertEquals(2, TestLARQUtils.count(nIter)) ;
        }

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