@Override
    public void execute(GraphModel graphModel) {
        Graph graph;
        if (isDirected) {
            graph = graphModel.getDirectedGraphVisible();
        } else {
            graph = graphModel.getUndirectedGraphVisible();
        }

        execute(graph);
    }
@Test
    public void testColumnCreation() {
        GraphModel graphModel = GraphGenerator.generateNullUndirectedGraph(1);

        ClusteringCoefficient cc = new ClusteringCoefficient();
        cc.execute(graphModel);

        Assert.assertTrue(graphModel.getNodeTable().hasColumn(ClusteringCoefficient.CLUSTERING_COEFF));
    }