ConnectedComponentsNGTest.java

/*
Copyright 2008-2010 Gephi
Authors : Mathieu Bastian <mathieu.bastian@gephi.org>
Website : http://www.gephi.org

This file is part of Gephi.

DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.

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 */
package org.gephi.statistics.plugin;

import java.util.HashMap;
import java.util.LinkedList;
import org.gephi.graph.api.DirectedGraph;
import org.gephi.graph.api.Edge;
import org.gephi.graph.api.GraphController;
import org.gephi.graph.api.GraphModel;
import org.gephi.graph.api.Node;
import org.gephi.graph.api.UndirectedGraph;
import org.gephi.project.api.ProjectController;
import org.gephi.project.impl.ProjectControllerImpl;
import org.openide.util.Lookup;
import static org.testng.Assert.*;
import org.testng.annotations.AfterMethod;
import org.testng.annotations.BeforeClass;
import org.testng.annotations.BeforeMethod;
import org.testng.annotations.Test;

/**
 *
 * @author Anna
 */
public class ConnectedComponentsNGTest {

    private ProjectController pc;

    @BeforeClass
    public void setUp() {
        pc = Lookup.getDefault().lookup(ProjectControllerImpl.class);
    }

    @BeforeMethod
    public void initialize() {
        pc.newProject();
    }

    @AfterMethod
    public void clean() {
        pc.closeCurrentProject();
    }

    @Test
    public void testComputeOneNodeWeeklyConnectedComponents() {
        GraphModel graphModel = GraphGenerator.generateNullUndirectedGraph(1);
        UndirectedGraph graph = graphModel.getUndirectedGraph();
        Node n = graph.getNode("0");

        ConnectedComponents c = new ConnectedComponents();
        HashMap<Node, Integer> indicies = new HashMap<>();
        indicies.put(n, 0);
        LinkedList<LinkedList<Node>> components = c.computeWeeklyConnectedComponents(graph, indicies);
        assertEquals(components.size(), 1);
    }

    @Test
    public void testNullGraphWeeklyConnectedComponents() {
        GraphModel graphModel = GraphGenerator.generateNullUndirectedGraph(5);
        UndirectedGraph graph = graphModel.getUndirectedGraph();
        Node n0 = graph.getNode("0");
        Node n1 = graph.getNode("1");
        Node n2 = graph.getNode("2");
        Node n3 = graph.getNode("3");
        Node n4 = graph.getNode("4");

        ConnectedComponents c = new ConnectedComponents();
        HashMap<Node, Integer> indicies = new HashMap<>();
        indicies.put(n0, 0);
        indicies.put(n1, 1);
        indicies.put(n2, 2);
        indicies.put(n3, 3);
        indicies.put(n4, 4);
        LinkedList<LinkedList<Node>> components = c.computeWeeklyConnectedComponents(graph, indicies);
        assertEquals(components.size(), 5);
    }

    @Test
    public void testComputeBarbellGraphWeeklyConnectedComponents() {
        GraphModel graphModel = GraphGenerator.generateCompleteUndirectedGraph(4);
        UndirectedGraph undirectedGraph = graphModel.getUndirectedGraph();
        Node[] nodes = new Node[4];
        for (int i = 0; i < 4; i++) {
            Node currentNode = graphModel.factory().newNode(((Integer) (i + 4)).toString());
            nodes[i] = currentNode;
            undirectedGraph.addNode(currentNode);
        }
        for (int i = 0; i < 3; i++) {
            for (int j = i + 1; j < 4; j++) {
                Edge currentEdge = graphModel.factory().newEdge(nodes[i], nodes[j], false);
                undirectedGraph.addEdge(currentEdge);
            }
        }
        Edge currentEdge = graphModel.factory().newEdge(undirectedGraph.getNode("0"), undirectedGraph.getNode("5"), false);
        undirectedGraph.addEdge(currentEdge);
        UndirectedGraph graph = graphModel.getUndirectedGraph();

        ConnectedComponents c = new ConnectedComponents();
        HashMap<Node, Integer> indicies = c.createIndiciesMap(graph);
        LinkedList<LinkedList<Node>> components = c.computeWeeklyConnectedComponents(graph, indicies);
        assertEquals(components.size(), 1);
    }

    @Test
    public void testSpecial1UndirectedGraphConnectedComponents() {
        GraphModel graphModel = Lookup.getDefault().lookup(GraphController.class).getGraphModel();
        UndirectedGraph undirectedGraph = graphModel.getUndirectedGraph();
        Node node1 = graphModel.factory().newNode("0");
        Node node2 = graphModel.factory().newNode("1");
        Node node3 = graphModel.factory().newNode("2");
        Node node4 = graphModel.factory().newNode("3");
        Node node5 = graphModel.factory().newNode("4");
        undirectedGraph.addNode(node1);
        undirectedGraph.addNode(node2);
        undirectedGraph.addNode(node3);
        undirectedGraph.addNode(node4);
        undirectedGraph.addNode(node5);
        Edge edge12 = graphModel.factory().newEdge(node1, node2, false);
        Edge edge14 = graphModel.factory().newEdge(node1, node4, false);
        Edge edge23 = graphModel.factory().newEdge(node2, node3, false);
        Edge edge25 = graphModel.factory().newEdge(node2, node5, false);
        Edge edge35 = graphModel.factory().newEdge(node3, node5, false);
        Edge edge43 = graphModel.factory().newEdge(node4, node3, false);
        Edge edge51 = graphModel.factory().newEdge(node5, node1, false);
        Edge edge54 = graphModel.factory().newEdge(node5, node4, false);
        undirectedGraph.addEdge(edge12);
        undirectedGraph.addEdge(edge14);
        undirectedGraph.addEdge(edge23);
        undirectedGraph.addEdge(edge25);
        undirectedGraph.addEdge(edge35);
        undirectedGraph.addEdge(edge43);
        undirectedGraph.addEdge(edge51);
        undirectedGraph.addEdge(edge54);

        UndirectedGraph graph = graphModel.getUndirectedGraph();

        ConnectedComponents c = new ConnectedComponents();
        HashMap<Node, Integer> indicies = c.createIndiciesMap(graph);
        LinkedList<LinkedList<Node>> components = c.computeWeeklyConnectedComponents(graph, indicies);
        assertEquals(components.size(), 1);
    }

    @Test
    public void testSpecial2UndirectedGraphConnectedComponents() {
        GraphModel graphModel = Lookup.getDefault().lookup(GraphController.class).getGraphModel();
        UndirectedGraph undirectedGraph = graphModel.getUndirectedGraph();
        Node node1 = graphModel.factory().newNode("0");
        Node node2 = graphModel.factory().newNode("1");
        Node node3 = graphModel.factory().newNode("2");
        Node node4 = graphModel.factory().newNode("3");
        Node node5 = graphModel.factory().newNode("4");
        Node node6 = graphModel.factory().newNode("5");
        Node node7 = graphModel.factory().newNode("6");
        Node node8 = graphModel.factory().newNode("7");
        Node node9 = graphModel.factory().newNode("8");
        undirectedGraph.addNode(node1);
        undirectedGraph.addNode(node2);
        undirectedGraph.addNode(node3);
        undirectedGraph.addNode(node4);
        undirectedGraph.addNode(node5);
        undirectedGraph.addNode(node6);
        undirectedGraph.addNode(node7);
        undirectedGraph.addNode(node8);
        undirectedGraph.addNode(node9);
        Edge edge12 = graphModel.factory().newEdge(node1, node2, false);
        Edge edge23 = graphModel.factory().newEdge(node2, node3, false);
        Edge edge45 = graphModel.factory().newEdge(node4, node5, false);
        Edge edge56 = graphModel.factory().newEdge(node5, node6, false);
        Edge edge64 = graphModel.factory().newEdge(node6, node4, false);
        Edge edge75 = graphModel.factory().newEdge(node7, node5, false);
        undirectedGraph.addEdge(edge12);
        undirectedGraph.addEdge(edge23);
        undirectedGraph.addEdge(edge45);
        undirectedGraph.addEdge(edge56);
        undirectedGraph.addEdge(edge64);
        undirectedGraph.addEdge(edge75);

        UndirectedGraph graph = graphModel.getUndirectedGraph();

        ConnectedComponents c = new ConnectedComponents();
        HashMap<Node, Integer> indicies = c.createIndiciesMap(graph);
        LinkedList<LinkedList<Node>> components = c.computeWeeklyConnectedComponents(graph, indicies);

        int componentNumber3 = c.getComponentNumber(components, node3);
        int componentNumber4 = c.getComponentNumber(components, node4);
        int componentNumber7 = c.getComponentNumber(components, node7);
        int componentNumber8 = c.getComponentNumber(components, node8);

        assertEquals(components.size(), 4);
        assertEquals(componentNumber4, componentNumber7);
        assertNotEquals(componentNumber3, componentNumber8);
    }

    @Test
    public void testDirectedPathGraphConnectedComponents() {
        GraphModel graphModel = GraphGenerator.generatePathDirectedGraph(4);
        DirectedGraph graph = graphModel.getDirectedGraph();

        ConnectedComponents c = new ConnectedComponents();
        HashMap<Node, Integer> indicies = c.createIndiciesMap(graph);
        LinkedList<LinkedList<Node>> components = c.top_tarjans(graph, indicies);
        assertEquals(components.size(), 4);
    }

    @Test
    public void testDirectedCyclicGraphConnectedComponents() {
        GraphModel graphModel = GraphGenerator.generateCyclicDirectedGraph(5);
        DirectedGraph graph = graphModel.getDirectedGraph();

        ConnectedComponents c = new ConnectedComponents();
        HashMap<Node, Integer> indicies = c.createIndiciesMap(graph);
        LinkedList<LinkedList<Node>> components = c.top_tarjans(graph, indicies);
        assertEquals(components.size(), 1);
    }

    @Test
    public void testSpecial1DirectedGraphConnectedComponents() {
        GraphModel graphModel = Lookup.getDefault().lookup(GraphController.class).getGraphModel();
        DirectedGraph directedGraph = graphModel.getDirectedGraph();
        Node node1 = graphModel.factory().newNode("0");
        Node node2 = graphModel.factory().newNode("1");
        Node node3 = graphModel.factory().newNode("2");
        Node node4 = graphModel.factory().newNode("3");
        Node node5 = graphModel.factory().newNode("4");
        directedGraph.addNode(node1);
        directedGraph.addNode(node2);
        directedGraph.addNode(node3);
        directedGraph.addNode(node4);
        directedGraph.addNode(node5);
        Edge edge12 = graphModel.factory().newEdge(node1, node2);
        Edge edge14 = graphModel.factory().newEdge(node1, node4);
        Edge edge23 = graphModel.factory().newEdge(node2, node3);
        Edge edge25 = graphModel.factory().newEdge(node2, node5);
        Edge edge35 = graphModel.factory().newEdge(node3, node5);
        Edge edge43 = graphModel.factory().newEdge(node4, node3);
        Edge edge51 = graphModel.factory().newEdge(node5, node1);
        Edge edge54 = graphModel.factory().newEdge(node5, node4);
        directedGraph.addEdge(edge12);
        directedGraph.addEdge(edge14);
        directedGraph.addEdge(edge23);
        directedGraph.addEdge(edge25);
        directedGraph.addEdge(edge35);
        directedGraph.addEdge(edge43);
        directedGraph.addEdge(edge51);
        directedGraph.addEdge(edge54);

        DirectedGraph graph = graphModel.getDirectedGraph();

        ConnectedComponents c = new ConnectedComponents();
        HashMap<Node, Integer> indicies = c.createIndiciesMap(graph);
        LinkedList<LinkedList<Node>> components = c.top_tarjans(graph, indicies);
        assertEquals(components.size(), 1);
    }

    @Test
    public void testSpecial2DirectedGraphConnectedComponents() {
        GraphModel graphModel = Lookup.getDefault().lookup(GraphController.class).getGraphModel();
        DirectedGraph directedGraph = graphModel.getDirectedGraph();
        Node node1 = graphModel.factory().newNode("0");
        Node node2 = graphModel.factory().newNode("1");
        Node node3 = graphModel.factory().newNode("2");
        Node node4 = graphModel.factory().newNode("3");
        Node node5 = graphModel.factory().newNode("4");
        directedGraph.addNode(node1);
        directedGraph.addNode(node2);
        directedGraph.addNode(node3);
        directedGraph.addNode(node4);
        directedGraph.addNode(node5);
        Edge edge12 = graphModel.factory().newEdge(node1, node2);
        Edge edge14 = graphModel.factory().newEdge(node1, node4);
        Edge edge23 = graphModel.factory().newEdge(node2, node3);
        Edge edge25 = graphModel.factory().newEdge(node2, node5);
        Edge edge35 = graphModel.factory().newEdge(node3, node5);
        Edge edge43 = graphModel.factory().newEdge(node4, node3);
        Edge edge54 = graphModel.factory().newEdge(node5, node4);
        directedGraph.addEdge(edge12);
        directedGraph.addEdge(edge14);
        directedGraph.addEdge(edge23);
        directedGraph.addEdge(edge25);
        directedGraph.addEdge(edge35);
        directedGraph.addEdge(edge43);
        directedGraph.addEdge(edge54);

        DirectedGraph graph = graphModel.getDirectedGraph();

        ConnectedComponents c = new ConnectedComponents();
        HashMap<Node, Integer> indicies = c.createIndiciesMap(graph);
        LinkedList<LinkedList<Node>> weeklyConnectedComponents = c.computeWeeklyConnectedComponents(graph, indicies);
        LinkedList<LinkedList<Node>> stronglyConnectedComponents = c.top_tarjans(graph, indicies);
        int componentNumber1 = c.getComponentNumber(stronglyConnectedComponents, node1);
        int componentNumber3 = c.getComponentNumber(stronglyConnectedComponents, node3);
        int componentNumber4 = c.getComponentNumber(stronglyConnectedComponents, node4);
        int componentNumber5 = c.getComponentNumber(stronglyConnectedComponents, node5);

        assertEquals(stronglyConnectedComponents.size(), 3);
        assertEquals(weeklyConnectedComponents.size(), 1);
        assertEquals(componentNumber3, componentNumber5);
        assertNotEquals(componentNumber1, componentNumber4);
    }

    @Test
    public void testSpecial3DirectedGraphConnectedComponents() {
        GraphModel graphModel = Lookup.getDefault().lookup(GraphController.class).getGraphModel();
        DirectedGraph directedGraph = graphModel.getDirectedGraph();
        Node node1 = graphModel.factory().newNode("0");
        Node node2 = graphModel.factory().newNode("1");
        Node node3 = graphModel.factory().newNode("2");
        Node node4 = graphModel.factory().newNode("3");
        Node node5 = graphModel.factory().newNode("4");
        Node node6 = graphModel.factory().newNode("5");
        Node node7 = graphModel.factory().newNode("6");
        Node node8 = graphModel.factory().newNode("7");
        Node node9 = graphModel.factory().newNode("8");
        directedGraph.addNode(node1);
        directedGraph.addNode(node2);
        directedGraph.addNode(node3);
        directedGraph.addNode(node4);
        directedGraph.addNode(node5);
        directedGraph.addNode(node6);
        directedGraph.addNode(node7);
        directedGraph.addNode(node8);
        directedGraph.addNode(node9);
        Edge edge12 = graphModel.factory().newEdge(node1, node2);
        Edge edge23 = graphModel.factory().newEdge(node2, node3);
        Edge edge45 = graphModel.factory().newEdge(node4, node5);
        Edge edge56 = graphModel.factory().newEdge(node5, node6);
        Edge edge64 = graphModel.factory().newEdge(node6, node4);
        Edge edge75 = graphModel.factory().newEdge(node7, node5);
        Edge edge89 = graphModel.factory().newEdge(node8, node9);
        Edge edge98 = graphModel.factory().newEdge(node9, node8);
        directedGraph.addEdge(edge12);
        directedGraph.addEdge(edge23);
        directedGraph.addEdge(edge45);
        directedGraph.addEdge(edge56);
        directedGraph.addEdge(edge64);
        directedGraph.addEdge(edge75);
        directedGraph.addEdge(edge89);
        directedGraph.addEdge(edge98);

        DirectedGraph graph = graphModel.getDirectedGraph();

        ConnectedComponents c = new ConnectedComponents();
        HashMap<Node, Integer> indicies = c.createIndiciesMap(graph);
        LinkedList<LinkedList<Node>> stronglyConnectedComponents = c.top_tarjans(graph, indicies);

        assertEquals(stronglyConnectedComponents.size(), 6);
    }

    @Test
    public void testSpecial4DirectedGraphConnectedComponents() {
        GraphModel graphModel = Lookup.getDefault().lookup(GraphController.class).getGraphModel();
        DirectedGraph directedGraph = graphModel.getDirectedGraph();
        Node node1 = graphModel.factory().newNode("0");
        Node node2 = graphModel.factory().newNode("1");
        Node node3 = graphModel.factory().newNode("2");
        Node node4 = graphModel.factory().newNode("3");
        Node node5 = graphModel.factory().newNode("4");
        Node node6 = graphModel.factory().newNode("5");
        Node node7 = graphModel.factory().newNode("6");
        Node node8 = graphModel.factory().newNode("7");
        directedGraph.addNode(node1);
        directedGraph.addNode(node2);
        directedGraph.addNode(node3);
        directedGraph.addNode(node4);
        directedGraph.addNode(node5);
        directedGraph.addNode(node6);
        directedGraph.addNode(node7);
        directedGraph.addNode(node8);
        Edge edge12 = graphModel.factory().newEdge(node1, node2);
        Edge edge23 = graphModel.factory().newEdge(node2, node3);
        Edge edge34 = graphModel.factory().newEdge(node3, node4);
        Edge edge41 = graphModel.factory().newEdge(node4, node1);
        Edge edge56 = graphModel.factory().newEdge(node5, node6);
        Edge edge67 = graphModel.factory().newEdge(node6, node7);
        Edge edge78 = graphModel.factory().newEdge(node7, node8);
        Edge edge85 = graphModel.factory().newEdge(node8, node5);
        Edge edge45 = graphModel.factory().newEdge(node4, node5);
        directedGraph.addEdge(edge12);
        directedGraph.addEdge(edge23);
        directedGraph.addEdge(edge34);
        directedGraph.addEdge(edge41);
        directedGraph.addEdge(edge56);
        directedGraph.addEdge(edge67);
        directedGraph.addEdge(edge78);
        directedGraph.addEdge(edge85);
        directedGraph.addEdge(edge45);

        DirectedGraph graph = graphModel.getDirectedGraph();

        ConnectedComponents c = new ConnectedComponents();
        HashMap<Node, Integer> indicies = c.createIndiciesMap(graph);
        LinkedList<LinkedList<Node>> stronglyConnectedComponents = c.top_tarjans(graph, indicies);

        int componentNumber1 = c.getComponentNumber(stronglyConnectedComponents, node1);
        int componentNumber5 = c.getComponentNumber(stronglyConnectedComponents, node5);

        assertEquals(stronglyConnectedComponents.size(), 2);
        assertNotEquals(componentNumber1, componentNumber5);
    }

    @Test
    public void testSpecial2UndirectedGraphGiantComponent() {
        GraphModel graphModel = Lookup.getDefault().lookup(GraphController.class).getGraphModel();
        UndirectedGraph undirectedGraph = graphModel.getUndirectedGraph();
        Node node1 = graphModel.factory().newNode("0");
        Node node2 = graphModel.factory().newNode("1");
        Node node3 = graphModel.factory().newNode("2");
        Node node4 = graphModel.factory().newNode("3");
        Node node5 = graphModel.factory().newNode("4");
        Node node6 = graphModel.factory().newNode("5");
        Node node7 = graphModel.factory().newNode("6");
        Node node8 = graphModel.factory().newNode("7");
        Node node9 = graphModel.factory().newNode("8");
        undirectedGraph.addNode(node1);
        undirectedGraph.addNode(node2);
        undirectedGraph.addNode(node3);
        undirectedGraph.addNode(node4);
        undirectedGraph.addNode(node5);
        undirectedGraph.addNode(node6);
        undirectedGraph.addNode(node7);
        undirectedGraph.addNode(node8);
        undirectedGraph.addNode(node9);
        Edge edge12 = graphModel.factory().newEdge(node1, node2, false);
        Edge edge23 = graphModel.factory().newEdge(node2, node3, false);
        Edge edge45 = graphModel.factory().newEdge(node4, node5, false);
        Edge edge56 = graphModel.factory().newEdge(node5, node6, false);
        Edge edge64 = graphModel.factory().newEdge(node6, node4, false);
        Edge edge75 = graphModel.factory().newEdge(node7, node5, false);
        undirectedGraph.addEdge(edge12);
        undirectedGraph.addEdge(edge23);
        undirectedGraph.addEdge(edge45);
        undirectedGraph.addEdge(edge56);
        undirectedGraph.addEdge(edge64);
        undirectedGraph.addEdge(edge75);

        UndirectedGraph graph = graphModel.getUndirectedGraph();

        ConnectedComponents c = new ConnectedComponents();
        HashMap<Node, Integer> indicies = c.createIndiciesMap(graph);
        LinkedList<LinkedList<Node>> components = c.computeWeeklyConnectedComponents(graph, indicies);
        c.fillComponentSizeList(components);

        int giantComponent = c.getGiantComponent();
        int componentNumber5 = c.getComponentNumber(components, node5);

        assertEquals(giantComponent, componentNumber5);
    }
}