Package org.apache.clerezza.rdf.core

Examples of org.apache.clerezza.rdf.core.MGraph.filter()

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     * @param graphName name of the graph to remove
     * @param graphType resource type of the graph to remove.
     */
    private void removeFromIndex(UriRef graphName, UriRef graphType) {
        MGraph index = graphNameIndex.getMGraph();
        Iterator<Triple> triplesToRemove = index.filter(graphName, RDF.type, graphType);
        for( ; triplesToRemove.hasNext(); ) {
            triplesToRemove.next();
            triplesToRemove.remove();
        }
        graphNameIndex.sync();
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        graphNameIndex.sync();
    }
   
    private void removeDefaultGraphFromIndex() {
      MGraph index = graphNameIndex.getMGraph();
      Iterator<Triple> triplesToRemove = index.filter(null, RDF.type, Symbols.Default);
      for( ; triplesToRemove.hasNext(); ) {
          Triple triple = triplesToRemove.next();
          triplesToRemove.remove();
          removeFromIndex( UriRef.class.cast(triple.getSubject()), Symbols.Graph );
      }
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        MGraph graph = getEmptyMGraph();
        Assert.assertEquals(0, graph.size());
        final TripleImpl triple1 = new TripleImpl(uriRef1, uriRef2, uriRef1);
        graph.add(triple1);
        Assert.assertEquals(1, graph.size());
        Iterator<Triple> tripleIter = graph.filter(uriRef1, uriRef2, uriRef1);
        Assert.assertTrue(tripleIter.hasNext());
        Triple tripleGot = tripleIter.next();
        Assert.assertEquals(triple1, tripleGot);
        Assert.assertFalse(tripleIter.hasNext());
        BNode bnode = new BNode() {};
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        Assert.assertEquals(triple1, tripleGot);
        Assert.assertFalse(tripleIter.hasNext());
        BNode bnode = new BNode() {};
        graph.add(new TripleImpl(bnode, uriRef1, uriRef3));
        graph.add(new TripleImpl(bnode, uriRef1, uriRef4));
        tripleIter = graph.filter(null, uriRef1, null);
        Set<NonLiteral> subjectInMatchingTriples = new HashSet<NonLiteral>();
        Set<Resource> objectsInMatchingTriples = new HashSet<Resource>();
        while (tripleIter.hasNext()) {
            Triple triple = tripleIter.next();
            subjectInMatchingTriples.add(triple.getSubject());
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        Set<Resource> expectedObjects = new HashSet<Resource>();
        expectedObjects.add(uriRef3);
        expectedObjects.add(uriRef4);
        Assert.assertEquals(expectedObjects, objectsInMatchingTriples);
        graph.add(new TripleImpl(bnode, uriRef4, bnode));
        tripleIter = graph.filter(null, uriRef4, null);
        Assert.assertTrue(tripleIter.hasNext());
        Triple retrievedTriple = tripleIter.next();
        Assert.assertFalse(tripleIter.hasNext());
        Assert.assertEquals(retrievedTriple.getSubject(), retrievedTriple.getObject());
        tripleIter = graph.filter(uriRef1, uriRef2, null);
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        tripleIter = graph.filter(null, uriRef4, null);
        Assert.assertTrue(tripleIter.hasNext());
        Triple retrievedTriple = tripleIter.next();
        Assert.assertFalse(tripleIter.hasNext());
        Assert.assertEquals(retrievedTriple.getSubject(), retrievedTriple.getObject());
        tripleIter = graph.filter(uriRef1, uriRef2, null);
        Assert.assertTrue(tripleIter.hasNext());
        retrievedTriple = tripleIter.next();
        Assert.assertFalse(tripleIter.hasNext());
        Assert.assertEquals(retrievedTriple.getSubject(), retrievedTriple.getObject());
    }
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        MGraph graph = getEmptyMGraph();
        Assert.assertEquals(0, graph.size());
        Literal value = new TypedLiteralImpl("<elem>value</elem>",xmlLiteralType);
        final TripleImpl triple1 = new TripleImpl(uriRef1, uriRef2, value);
        graph.add(triple1);
        Iterator<Triple> tripleIter = graph.filter(uriRef1, uriRef2, null);
        Assert.assertTrue(tripleIter.hasNext());
        Resource gotValue = tripleIter.next().getObject();
        Assert.assertEquals(value, gotValue);
    }
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        Assert.assertEquals(0, graph.size());
        Language language = new Language("it");
        Literal value = new PlainLiteralImpl("<elem>value</elem>",language);
        final TripleImpl triple1 = new TripleImpl(uriRef1, uriRef2, value);
        graph.add(triple1);
        Iterator<Triple> tripleIter = graph.filter(uriRef1, uriRef2, null);
        Assert.assertTrue(tripleIter.hasNext());
        Resource gotValue = tripleIter.next().getObject();
        Assert.assertEquals(value, gotValue);
        Assert.assertEquals(language, ((PlainLiteral)gotValue).getLanguage());
    }
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        final PlainLiteralImpl name2 = new PlainLiteralImpl("http://example.org/people/bob");
        final Triple tripleAlice = new TripleImpl(bNode, HAS_NAME, name);
        final Triple tripleBob = new TripleImpl(bNode, HAS_NAME, name2);
        Assert.assertTrue(graph.add(tripleAlice));
        Assert.assertTrue(graph.add(tripleBob));
        Iterator<Triple> result = graph.filter(null, HAS_NAME, name);
        Assert.assertEquals(bNode, result.next().getSubject());
    }

    @Test
    public void testContainsIfContained() throws Exception {
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    @Test
    public void testFilterEmptyGraph() throws Exception {
        MGraph graph = getEmptyMGraph();
        Iterator<Triple> i = graph.filter(null, null, null);
        Assert.assertFalse(i.hasNext());
    }


    @Test
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