Examples of org.openrdf.sail.SailConnection.clear()

org.openrdf.sail.SailConnection.clear()
Removes all statements from the specified/all contexts. If no contexts are specified the method operates on the entire repository. @param contexts The context(s) from which to remove the statements. Note that this parameter is a vararg and as such is optional. If no contexts are supplied the method operates on the entire repository. @throws SailException If the statements could not be removed.


    protected void clear() throws Exception {
        SailConnection sc = sail.getConnection();
        try {
            sc.begin();
            sc.clear();
            sc.commit();
        } finally {
            sc.rollback();
            sc.close();
        }

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            URI uriB = sail.getValueFactory().createURI("http://example.org/uriB");
            URI uriC = sail.getValueFactory().createURI("http://example.org/uriC");
            SailConnection sc = sail.getConnection();
            try {
                sc.begin();
                sc.clear();
                assertEquals(0, countStatements(sc, uriA, uriB, uriC, false));
                sc.addStatement(uriA, uriB, uriC);
                assertEquals(1, countStatements(sc, uriA, uriB, uriC, false));
                sc.addStatement(uriA, uriB, uriC);
                assertEquals(1, countStatements(sc, uriA, uriB, uriC, false));

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            URI uriB = sail.getValueFactory().createURI("http://example.org/uriB");
            URI uriC = sail.getValueFactory().createURI("http://example.org/uriC");
            SailConnection sc = sail.getConnection();
            try {
                sc.begin();
                sc.clear();
                sc.commit();
                sc.begin();
                events.clear();
                assertEquals(0, events.size());
                sc.addStatement(uriA, uriB, uriC, uriA);

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                event = events.iterator().next();
                assertFalse(event.statementsAdded());
                assertTrue(event.statementsRemoved());
                events.clear();
                assertEquals(0, events.size());
                sc.clear();
                sc.commit();
                sc.begin();
                assertEquals(1, events.size());
                event = events.iterator().next();
                assertFalse(event.statementsAdded());

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            URI classX = sail.getValueFactory().createURI("http://example.org/classX");
            URI classY = sail.getValueFactory().createURI("http://example.org/classY");


            SailConnection sc = inferencer.getConnection();
            try {
                sc.clear();


                sc.addStatement(classX, RDFS.SUBCLASSOF, classY);
                sc.addStatement(uriA, RDF.TYPE, classX);
                sc.addStatement(uriB, RDF.TYPE, classY);
                sc.commit();

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            assertEquals(13, countStatements(sc, null, null, null, false));
            assertEquals(edgesBefore + 13, countEdges());
            assertEquals(verticesBefore + 9, countVertices());


            sc.clear();
            sc.commit();
            sc.begin();


            assertEquals(0, countStatements(sc, null, null, null, false));
            assertEquals(0, countEdges());

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            sc.begin();
            URI uriA = sail.getValueFactory().createURI("http://example.org/uriA");
            URI uriB = sail.getValueFactory().createURI("http://example.org/uriB");
            URI uriC = sail.getValueFactory().createURI("http://example.org/uriC");
            int count;
            sc.clear();
            //sc.removeStatements(uriA, uriA, uriA);
            sc.commit();
            sc.begin();
            Resource[] contexts = {uriA, null};
            sc.addStatement(uriA, uriB, uriC, contexts);

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        URI uriC = sail.getValueFactory().createURI("http://example.org/uriC");


        SailConnection sc = sail.getConnection();
        try {
            sc.begin();
            sc.clear();
            assertEquals(0L, sc.size());
            sc.addStatement(uriA, uriB, uriC, uriA);
            sc.addStatement(uriC, uriA, uriB, uriA);
            sc.addStatement(uriB, uriC, uriA, uriA);
            assertEquals(3L, sc.size(uriA));

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            sc.addStatement(uriB, uriC, uriA, uriC);
            sc.addStatement(uriC, uriA, uriB, uriC);
            sc.addStatement(uriA, uriB, uriB, uriC);
            assertEquals(4L, sc.size(uriC));
            assertEquals(10L, sc.size());
            sc.clear(uriA, uriC);
            assertEquals(1L, sc.size((Resource) null));
            assertEquals(0L, sc.size(uriA));
            assertEquals(2L, sc.size(uriB));
            assertEquals(0L, sc.size(uriC));
            assertEquals(3L, sc.size());

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            assertEquals(1L, sc.size((Resource) null));
            assertEquals(0L, sc.size(uriA));
            assertEquals(2L, sc.size(uriB));
            assertEquals(0L, sc.size(uriC));
            assertEquals(3L, sc.size());
            sc.clear();
            assertEquals(0L, sc.size());
            sc.commit();
        } finally {
            sc.rollback();
            sc.close();

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