/*
   * The subroutine of DFS. NOTE: the set is used to distinguish between 1st
   * and 2nd round of DFS. set == null: finished vertices are stored (1st
   * round). set != null: all vertices found will be saved in the set (2nd
   * round)
   */
  private void dfsVisit(
      DirectedGraph<V, E> visitedGraph, VertexData<V> vertexData, Set<V> vertices) {
    Deque<VertexData<V>> stack = new ArrayDeque<VertexData<V>>();
    stack.add(vertexData);

    while (!stack.isEmpty()) {
      VertexData<V> data = stack.removeLast();

      if (!data.isDiscovered()) {
        data.setDiscovered(true);

        if (vertices != null) {
          vertices.add(data.getVertex());
        }

        stack.add(new VertexData1<V>(data, true, true));

        // follow all edges
        for (E edge : visitedGraph.outgoingEdgesOf(data.getVertex())) {
          VertexData<V> targetData = vertexToVertexData.get(visitedGraph.getEdgeTarget(edge));

          if (!targetData.isDiscovered()) {
            // the "recursion"
            stack.add(targetData);
          }
        }
      } else if (data.isFinished()) {
        if (vertices == null) {
          orderedVertices.addFirst(data.getFinishedData());
        }
      }
    }
  }
  /*
   * Creates a VertexData object for every vertex in the graph and stores
   * them
   * in a HashMap.
   */
  private void createVertexData() {
    vertexToVertexData = new HashMap<V, VertexData<V>>(graph.vertexSet().size());

    for (V vertex : graph.vertexSet()) {
      vertexToVertexData.put(vertex, new VertexData2<V>(vertex, false, false));
    }
  }
  private void replaceVertex(JavaClass newClass) {
    List<JavaClass> incomingEdges = getParents(newClass);

    graph.removeVertex(newClass);
    graph.addVertex(newClass);
    for (JavaClass each : incomingEdges) {
      graph.addEdge(each, newClass);
    }
  }
 private void updateParentReferences(JavaClass parentClass) {
   for (String child : parentClass.getImports()) {
     JavaClass childClass = findJavaClass(child);
     if ((childClass != null) && !childClass.equals(parentClass)) {
       if (graph.containsVertex(childClass)) {
         graph.addEdge(parentClass, childClass);
       }
     }
   }
 }
 /** @see GraphListener#edgeRemoved(GraphEdgeChangeEvent) */
 public void edgeRemoved(GraphEdgeChangeEvent<V, E> e) {
   E edge = e.getEdge();
   V source = graph.getEdgeSource(edge);
   V target = graph.getEdgeTarget(edge);
   if (successorMap.containsKey(source)) {
     successorMap.get(source).removeNeighbor(target);
   }
   if (predecessorMap.containsKey(target)) {
     predecessorMap.get(target).removeNeighbor(source);
   }
 }
  /** . */
  public void testStronglyConnected2() {
    DirectedGraph<String, DefaultEdge> g =
        new DefaultDirectedGraph<String, DefaultEdge>(DefaultEdge.class);
    g.addVertex(V1);
    g.addVertex(V2);
    g.addVertex(V3);
    g.addVertex(V4);

    g.addEdge(V1, V2);
    g.addEdge(V2, V1); // strongly connected

    g.addEdge(V4, V3); // only weakly connected
    g.addEdge(V3, V2); // only weakly connected

    StrongConnectivityInspector<String, DefaultEdge> inspector =
        new StrongConnectivityInspector<String, DefaultEdge>(g);

    // convert from List to Set because we need to ignore order
    // during comparison
    Set<Set<String>> actualSets = new HashSet<Set<String>>(inspector.stronglyConnectedSets());

    // construct the expected answer
    Set<Set<String>> expectedSets = new HashSet<Set<String>>();
    Set<String> set = new HashSet<String>();
    set.add(V1);
    set.add(V2);
    expectedSets.add(set);
    set = new HashSet<String>();
    set.add(V3);
    expectedSets.add(set);
    set = new HashSet<String>();
    set.add(V4);
    expectedSets.add(set);

    assertEquals(expectedSets, actualSets);

    actualSets.clear();

    List<DirectedSubgraph<String, DefaultEdge>> subgraphs = inspector.stronglyConnectedSubgraphs();
    for (DirectedSubgraph<String, DefaultEdge> sg : subgraphs) {
      actualSets.add(sg.vertexSet());

      StrongConnectivityInspector<String, DefaultEdge> ci =
          new StrongConnectivityInspector<String, DefaultEdge>(sg);
      assertTrue(ci.isStronglyConnected());
    }

    assertEquals(expectedSets, actualSets);
  }
Exemple #7
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  /**
   * Finds the vertex set for the subgraph of all cycles.
   *
   * @return set of all vertices which participate in at least one cycle in this graph
   */
  public Set<V> findCycles() {
    // ProbeIterator can't be used to handle this case,
    // so use StrongConnectivityInspector instead.
    StrongConnectivityInspector<V, E> inspector = new StrongConnectivityInspector<V, E>(graph);
    List<Set<V>> components = inspector.stronglyConnectedSets();

    // A vertex participates in a cycle if either of the following is
    // true:  (a) it is in a component whose size is greater than 1
    // or (b) it is a self-loop

    Set<V> set = new HashSet<V>();
    for (Set<V> component : components) {
      if (component.size() > 1) {
        // cycle
        set.addAll(component);
      } else {
        V v = component.iterator().next();
        if (graph.containsEdge(v, v)) {
          // self-loop
          set.add(v);
        }
      }
    }

    return set;
  }
 public Set<String> getIndexedClasses() {
   Set<String> classes = newHashSet();
   Set<JavaClass> vertexSet = graph.vertexSet();
   for (JavaClass each : vertexSet) {
     classes.add(each.getName());
   }
   return classes;
 }
 private JavaClass findClass(String classname) {
   for (JavaClass jClass : graph.vertexSet()) {
     if (jClass.getName().equals(classname)) {
       return jClass;
     }
   }
   return null;
 }
Exemple #10
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  // experimental
  // ====================================================================
  // ====================================================================
  // ====================================================================
  private void readAndDrawBIGGraph(String file) {
    // behövs inte än
    // @TODO
    // hur rita flera linjer mellan 2 noder? (för flera linjer)
    // reading of the graph should be done in the graph itself
    // it should be possible to get an iterator over nodes and one over edges
    // read in all the stops and lines and draw the lmap
    Scanner indata = null;
    // insert into p-queue to get them sorted
    names = new PriorityQueue<String>();
    try {
      // Read stops and put them in the node-table
      // in order to give the user a list of possible stops
      // assume input file is correct
      indata = new Scanner(new File(file + "-stops.txt"), "ISO-8859"); //
      while (indata.hasNext()) {
        String hpl = indata.next().trim();
        int xco = indata.nextInt();
        int yco = indata.nextInt();
        noderna.add(new BusStop(hpl, xco, yco));
        names.add(hpl);
        // Draw
        // this is a fix: fixa att Kålltorp och Torp är samma hållplats
        if (hpl.equals("Torp")) {
          xco += 11;
          hpl = "   / Torp";
        }
        karta.drawString(hpl, xco, yco, DrawGraph.Layer.BASE);
      }
      indata.close();

      //  Read in the lines and add to the graph
      indata = new Scanner(new File(file + "-lines.txt"), "ISO-8859");
      grafen = new DirectedGraph<BusEdge>(noderna.noOfNodes());
      Color color =
          new Color((float) Math.random(), (float) Math.random(), (float) Math.random()); //
      String lineNo = "1"; //
      while (indata.hasNext()) { // assume lines are correct
        int from = noderna.find(indata.next()).getNodeNo();
        int to = noderna.find(indata.next()).getNodeNo();
        grafen.addEdge(new BusEdge(from, to, indata.nextInt(), lineNo));
        indata.nextLine(); // skip rest of line
        // Draw
        BusStop busFrom = noderna.find(from);
        BusStop busTo = noderna.find(to);
        karta.drawLine(
            busFrom.xpos, busFrom.ypos, busTo.xpos, busTo.ypos, color, 2.0f, DrawGraph.Layer.BASE);
      }
      indata.close();
    } catch (FileNotFoundException fnfe) {
      throw new RuntimeException(" Indata till busshållplatserna saknas");
    }
    karta.repaint();
  } // end readAndDrawBIGGraph
  /** @see GraphListener#edgeAdded(GraphEdgeChangeEvent) */
  public void edgeAdded(GraphEdgeChangeEvent<V, E> e) {
    E edge = e.getEdge();
    V source = graph.getEdgeSource(edge);
    V target = graph.getEdgeTarget(edge);

    // if a map does not already contain an entry,
    // then skip addNeighbor, since instantiating the map
    // will take care of processing the edge (which has already
    // been added)

    if (successorMap.containsKey(source)) {
      getSuccessors(source).addNeighbor(target);
    } else {
      getSuccessors(source);
    }
    if (predecessorMap.containsKey(target)) {
      getPredecessors(target).addNeighbor(source);
    } else {
      getPredecessors(target);
    }
  }
  /** HG: measures time needed to check a pair of huge random graphs */
  @Test
  public void testHugeGraph() {
    int n = 700;
    long time = System.currentTimeMillis();

    DirectedGraph<Integer, DefaultEdge>
        g1 = SubgraphIsomorphismTestUtils.randomGraph(n, n * n / 50, 12345),
        g2 = SubgraphIsomorphismTestUtils.randomSubgraph(g1, n / 2, 54321);

    VF2SubgraphIsomorphismInspector<Integer, DefaultEdge> vf2 =
        new VF2SubgraphIsomorphismInspector<>(g1, g2);

    assertEquals(true, vf2.isomorphismExists());

    SubgraphIsomorphismTestUtils.showLog(
        "|V1| = "
            + g1.vertexSet().size()
            + ", |E1| = "
            + g1.edgeSet().size()
            + ", |V2| = "
            + g2.vertexSet().size()
            + ", |E2| = "
            + g2.edgeSet().size()
            + " - "
            + (System.currentTimeMillis() - time)
            + "ms");
  }
Exemple #13
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  // ====================================================================
  private void findShort() {
    // svårt att behålla linjefärgerna?
    int start, s**t;
    try { // read from station
      String str = from.getText();
      str = Character.toUpperCase(str.charAt(0)) + str.substring(1);
      start = noderna.find(str).getNodeNo();
    } catch (NullPointerException npe) {
      route.setText(felTextStart + "\n");
      return;
    }
    try { // read to station
      String str = to.getText();
      str = Character.toUpperCase(str.charAt(0)) + str.substring(1);
      s**t = noderna.find(str).getNodeNo();
    } catch (NullPointerException npe) {
      route.setText(felTextSlut + "\n");
      return;
    }

    double totWeight = 0;
    int totNodes = 0;
    route.setText("");
    karta.clearLayer(DrawGraph.Layer.OVERLAY);
    Iterator<BusEdge> it = grafen.shortestPath(start, s**t);
    while (it.hasNext()) {
      BusEdge e = it.next();
      route.append(makeText1(e) + "\n");
      totNodes++;
      totWeight += e.getWeight();
      // draw the shortest path
      BusStop from = noderna.find(e.from), to = noderna.find(e.to);
      karta.drawLine(
          from.xpos, from.ypos, to.xpos, to.ypos, Color.black, 4.0, DrawGraph.Layer.OVERLAY);
    }
    karta.repaint();
    route.append("Antal: " + totNodes + " totalvikt: " + totWeight + "\n");
    from.setText("");
    to.setText("");
  } // findShort
Exemple #14
0
 // ====================================================================
 private void findMinSpan() {
   route.setText("");
   Iterator<BusEdge> it = grafen.minimumSpanningTree();
   if (it != null && it.hasNext()) {
     double totWeight = 0;
     int totNodes = 0; // only for easier testing
     karta.clearLayer(DrawGraph.Layer.OVERLAY);
     while (it.hasNext()) {
       BusEdge be = it.next();
       totNodes++;
       totWeight += be.getWeight();
       route.append(makeText2(be) + "\n");
       // draw the MST
       BusStop from = noderna.find(be.from);
       BusStop to = noderna.find(be.to);
       karta.drawLine(
           from.xpos, from.ypos, to.xpos, to.ypos, Color.red, 2.5, DrawGraph.Layer.OVERLAY);
     }
     karta.repaint();
     route.append("Antal: " + totNodes + " totalvikt: " + totWeight + "\n");
   } else from.setText("Det fanns ej någon lösning");
   to.setText("");
   from.setText("");
 } //  findMinSpan
  /** Tests edge cases on directed graphs */
  @Test
  public void testEdgeCasesDirectedGraph() {

    /* ECD-1: graph and subgraph empty */

    DirectedGraph<Integer, DefaultEdge> dg0v = new DefaultDirectedGraph<>(DefaultEdge.class),
        dg0v2 = new DefaultDirectedGraph<>(DefaultEdge.class);

    VF2SubgraphIsomorphismInspector<Integer, DefaultEdge> vf1 =
        new VF2SubgraphIsomorphismInspector<>(dg0v, dg0v2);

    assertEquals("[]", vf1.getMappings().next().toString());

    /* ECD-2: graph non-empty, subgraph empty */

    DirectedGraph<Integer, DefaultEdge> dg4v3e = new DefaultDirectedGraph<>(DefaultEdge.class);

    dg4v3e.addVertex(1);
    dg4v3e.addVertex(2);
    dg4v3e.addVertex(3);
    dg4v3e.addVertex(4);

    dg4v3e.addEdge(1, 2);
    dg4v3e.addEdge(3, 2);
    dg4v3e.addEdge(3, 4);

    VF2SubgraphIsomorphismInspector<Integer, DefaultEdge> vf2 =
        new VF2SubgraphIsomorphismInspector<>(dg4v3e, dg0v);

    assertEquals("[1=~~ 2=~~ 3=~~ 4=~~]", vf2.getMappings().next().toString());

    /* ECD-3: graph empty, subgraph non-empty */

    VF2SubgraphIsomorphismInspector<Integer, DefaultEdge> vf3 =
        new VF2SubgraphIsomorphismInspector<>(dg0v, dg4v3e);

    assertEquals(false, vf3.isomorphismExists());

    /* ECD-4: graph non-empty, subgraph single vertex */

    DirectedGraph<Integer, DefaultEdge> dg1v = new DefaultDirectedGraph<>(DefaultEdge.class);

    dg1v.addVertex(5);

    VF2SubgraphIsomorphismInspector<Integer, DefaultEdge> vf4 =
        new VF2SubgraphIsomorphismInspector<>(dg4v3e, dg1v);

    Iterator<GraphMapping<Integer, DefaultEdge>> iter4 = vf4.getMappings();

    Set<String> mappings =
        new HashSet<>(
            Arrays.asList(
                "[1=5 2=~~ 3=~~ 4=~~]",
                "[1=~~ 2=5 3=~~ 4=~~]",
                "[1=~~ 2=~~ 3=5 4=~~]",
                "[1=~~ 2=~~ 3=~~ 4=5]"));
    assertEquals(true, mappings.remove(iter4.next().toString()));
    assertEquals(true, mappings.remove(iter4.next().toString()));
    assertEquals(true, mappings.remove(iter4.next().toString()));
    assertEquals(true, mappings.remove(iter4.next().toString()));
    assertEquals(false, iter4.hasNext());

    /* ECD-5: graph empty, subgraph single vertex */

    VF2SubgraphIsomorphismInspector<Integer, DefaultEdge> vf5 =
        new VF2SubgraphIsomorphismInspector<>(dg0v, dg1v);

    assertEquals(false, vf5.isomorphismExists());

    /* ECD-6: subgraph with vertices, but no edges */

    DirectedGraph<Integer, DefaultEdge> dg3v0e = new DefaultDirectedGraph<>(DefaultEdge.class);

    dg3v0e.addVertex(5);
    dg3v0e.addVertex(6);
    dg3v0e.addVertex(7);

    VF2SubgraphIsomorphismInspector<Integer, DefaultEdge> vf6 =
        new VF2SubgraphIsomorphismInspector<>(dg4v3e, dg3v0e);

    assertEquals(false, vf6.isomorphismExists());

    /* ECD-7: graph and subgraph with vertices, but no edges */

    DirectedGraph<Integer, DefaultEdge> dg2v0e = new DefaultDirectedGraph<>(DefaultEdge.class);

    dg2v0e.addVertex(1);
    dg2v0e.addVertex(2);

    VF2SubgraphIsomorphismInspector<Integer, DefaultEdge> vf7 =
        new VF2SubgraphIsomorphismInspector<>(dg3v0e, dg2v0e);

    Iterator<GraphMapping<Integer, DefaultEdge>> iter7 = vf7.getMappings();

    Set<String> mappings7 =
        new HashSet<>(
            Arrays.asList(
                "[5=1 6=2 7=~~]",
                "[5=1 6=~~ 7=2]",
                "[5=2 6=1 7=~~]",
                "[5=~~ 6=1 7=2]",
                "[5=2 6=~~ 7=1]",
                "[5=~~ 6=2 7=1]"));
    assertEquals(true, mappings7.remove(iter7.next().toString()));
    assertEquals(true, mappings7.remove(iter7.next().toString()));
    assertEquals(true, mappings7.remove(iter7.next().toString()));
    assertEquals(true, mappings7.remove(iter7.next().toString()));
    assertEquals(true, mappings7.remove(iter7.next().toString()));
    assertEquals(true, mappings7.remove(iter7.next().toString()));
    assertEquals(false, iter7.hasNext());

    /* ECD-8: graph no edges, subgraph contains single edge */

    DirectedGraph<Integer, DefaultEdge> dg2v1e = new DefaultDirectedGraph<>(DefaultEdge.class);

    dg2v1e.addVertex(5);
    dg2v1e.addVertex(6);

    dg2v1e.addEdge(5, 6);

    VF2SubgraphIsomorphismInspector<Integer, DefaultEdge> vf8 =
        new VF2SubgraphIsomorphismInspector<>(dg3v0e, dg2v1e);

    assertEquals(false, vf8.isomorphismExists());

    /* ECD-9: complete graphs of different size,
     * graph smaller than subgraph */

    DirectedGraph<Integer, DefaultEdge> dg5c = new DefaultDirectedGraph<>(DefaultEdge.class);

    dg5c.addVertex(0);
    dg5c.addVertex(1);
    dg5c.addVertex(2);
    dg5c.addVertex(3);
    dg5c.addVertex(4);

    dg5c.addEdge(0, 1);
    dg5c.addEdge(0, 2);
    dg5c.addEdge(0, 3);
    dg5c.addEdge(0, 4);
    dg5c.addEdge(1, 2);
    dg5c.addEdge(1, 3);
    dg5c.addEdge(1, 4);
    dg5c.addEdge(2, 3);
    dg5c.addEdge(2, 4);
    dg5c.addEdge(3, 4);

    DirectedGraph<Integer, DefaultEdge> dg4c = new DefaultDirectedGraph<>(DefaultEdge.class);

    dg4c.addVertex(0);
    dg4c.addVertex(1);
    dg4c.addVertex(2);
    dg4c.addVertex(3);

    dg4c.addEdge(0, 1);
    dg4c.addEdge(0, 2);
    dg4c.addEdge(0, 3);
    dg4c.addEdge(1, 2);
    dg4c.addEdge(1, 3);
    dg4c.addEdge(2, 3);

    VF2SubgraphIsomorphismInspector<Integer, DefaultEdge> vf9 =
        new VF2SubgraphIsomorphismInspector<>(dg4c, dg5c);

    assertEquals(false, vf9.isomorphismExists());

    /* ECD-10: complete graphs of different size,
     * graph bigger than subgraph */

    VF2SubgraphIsomorphismInspector<Integer, DefaultEdge> vf10 =
        new VF2SubgraphIsomorphismInspector<>(dg5c, dg4c);

    Iterator<GraphMapping<Integer, DefaultEdge>> iter10 = vf10.getMappings();

    Set<String> mappings10 =
        new HashSet<>(
            Arrays.asList(
                "[0=0 1=1 2=2 3=3 4=~~]",
                "[0=0 1=1 2=2 3=~~ 4=3]",
                "[0=0 1=1 2=~~ 3=2 4=3]",
                "[0=0 1=~~ 2=1 3=2 4=3]",
                "[0=~~ 1=0 2=1 3=2 4=3]"));
    assertEquals(true, mappings10.remove(iter10.next().toString()));
    assertEquals(true, mappings10.remove(iter10.next().toString()));
    assertEquals(true, mappings10.remove(iter10.next().toString()));
    assertEquals(true, mappings10.remove(iter10.next().toString()));
    assertEquals(true, mappings10.remove(iter10.next().toString()));
    assertEquals(false, iter10.hasNext());

    /* ECD-11: isomorphic graphs */

    VF2SubgraphIsomorphismInspector<Integer, DefaultEdge> vf11 =
        new VF2SubgraphIsomorphismInspector<>(dg4v3e, dg4v3e);

    Iterator<GraphMapping<Integer, DefaultEdge>> iter11 = vf11.getMappings();

    assertEquals("[1=1 2=2 3=3 4=4]", iter11.next().toString());
    assertEquals(false, iter11.hasNext());

    /* ECD-12: not connected graphs of different size */

    DirectedGraph<Integer, DefaultEdge> dg6v4enc = new DefaultDirectedGraph<>(DefaultEdge.class);

    dg6v4enc.addVertex(0);
    dg6v4enc.addVertex(1);
    dg6v4enc.addVertex(2);
    dg6v4enc.addVertex(3);
    dg6v4enc.addVertex(4);
    dg6v4enc.addVertex(5);

    dg6v4enc.addEdge(1, 2);
    dg6v4enc.addEdge(2, 3);
    dg6v4enc.addEdge(3, 1);
    dg6v4enc.addEdge(4, 5);

    DirectedGraph<Integer, DefaultEdge> dg5v4enc = new DefaultDirectedGraph<>(DefaultEdge.class);

    dg5v4enc.addVertex(6);
    dg5v4enc.addVertex(7);
    dg5v4enc.addVertex(8);
    dg5v4enc.addVertex(9);
    dg5v4enc.addVertex(10);

    dg5v4enc.addEdge(7, 6);
    dg5v4enc.addEdge(9, 8);
    dg5v4enc.addEdge(10, 9);
    dg5v4enc.addEdge(8, 10);

    VF2SubgraphIsomorphismInspector<Integer, DefaultEdge> vf12 =
        new VF2SubgraphIsomorphismInspector<>(dg6v4enc, dg5v4enc);

    Iterator<GraphMapping<Integer, DefaultEdge>> iter12 = vf12.getMappings();

    Set<String> mappings12 =
        new HashSet<>(
            Arrays.asList(
                "[0=~~ 1=8 2=10 3=9 4=7 5=6]",
                "[0=~~ 1=9 2=8 3=10 4=7 5=6]",
                "[0=~~ 1=10 2=9 3=8 4=7 5=6]"));
    assertEquals(true, mappings12.remove(iter12.next().toString()));
    assertEquals(true, mappings12.remove(iter12.next().toString()));
    assertEquals(true, mappings12.remove(iter12.next().toString()));
    assertEquals(false, iter12.hasNext());
  }
Exemple #16
0
  // ====================================================================
  // ====================================================================
  private void readAndDrawGraph() {
    // @TODO
    // hur rita flera linjer mellan 2 noder? (för flera linjer)
    // reading of the graph should be done in the graph itself
    // it should be possible to get an iterator over nodes and one over edges
    // read in all the stops and lines and draw the lmap
    Scanner indata = null;
    // insert into p-queue to get them sorted
    names = new PriorityQueue<String>();
    try {
      // Read stops and put them in the node-table
      // in order to give the user a list of possible stops
      // assume input file is correct
      indata = new Scanner(new File("stops.noBOM.txt"), "UTF-8");
      while (indata.hasNext()) {
        String hpl = indata.next().trim();
        int xco = indata.nextInt();
        int yco = indata.nextInt();
        noderna.add(new BusStop(hpl, xco, yco));
        names.add(hpl);
        // Draw
        /*
        // Denna fix som slår ihop Kålltorp och Torp är förvirrande eftersom de är olika noder i grafen.
        // Tror man att det är samma nod blir resultatet förrvirrande.
        // Till nästa gång: Gör till samma nod med namnet Virginsgatan. Så är det i verkligheten nu.

        				// this is a fix: fixa att Kålltorp och Torp är samma hållplats
        				if ( hpl.equals("Torp") ) {
        					xco += 11;
        					hpl = "   / Torp";
        				}
        */
        karta.drawString(hpl, xco, yco, DrawGraph.Layer.BASE);
      }
      indata.close();

      //  Read in the lines and add to the graph
      indata = new Scanner(new File("lines.noBOM.txt"), "UTF-8");
      grafen = new DirectedGraph<BusEdge>(noderna.noOfNodes());
      while (indata.hasNext()) {
        String lineNo = indata.next();
        int antal = indata.nextInt() - 1;
        int from = noderna.find(indata.next()).getNodeNo();
        // hur rita flera linjer mellan 2 noder?
        // enkel inc fungerar inte
        // färgen kunde vara "äkta" dvs linjefärg
        Color color =
            new Color((float) Math.random(), (float) Math.random(), (float) Math.random());
        for (int i = 0; i < antal; i++) {
          int to = noderna.find(indata.next()).getNodeNo();
          grafen.addEdge(new BusEdge(from, to, indata.nextInt(), lineNo));
          // Draw
          BusStop busFrom = noderna.find(from);
          BusStop busTo = noderna.find(to);
          karta.drawLine(
              busFrom.xpos,
              busFrom.ypos,
              busTo.xpos,
              busTo.ypos,
              color,
              2.0f,
              DrawGraph.Layer.BASE);
          from = to;
        }
      }
      indata.close();
    } catch (FileNotFoundException fnfe) {
      throw new RuntimeException(" Indata till busshållplatserna saknas");
    }
    karta.repaint();
  } // end readAndDrawGraph
 private void addToGraph(JavaClass newClass) {
   if (!graph.addVertex(newClass)) {
     replaceVertex(newClass);
   }
 }
 /** @see CrossComponentIterator.Specifics#edgesOf(Object) */
 public Set<? extends EE> edgesOf(VV vertex) {
   return graph.outgoingEdgesOf(vertex);
 }
  @Test
  public void testExhaustive() {

    /* DET-1:
     *
     *      0   3
     *      |  /|        0 2
     * g1 = | 2 |   g2 = |/
     *      |/  |        1
     *      1   4
     */

    SimpleGraph<Integer, DefaultEdge> g1 = new SimpleGraph<>(DefaultEdge.class),
        g2 = new SimpleGraph<>(DefaultEdge.class);

    g1.addVertex(0);
    g1.addVertex(1);
    g1.addVertex(2);
    g1.addVertex(3);
    g1.addVertex(4);

    g2.addVertex(0);
    g2.addVertex(1);
    g2.addVertex(2);

    g1.addEdge(0, 1);
    g1.addEdge(1, 2);
    g1.addEdge(2, 3);
    g1.addEdge(3, 4);

    g2.addEdge(0, 1);
    g2.addEdge(1, 2);

    VF2SubgraphIsomorphismInspector<Integer, DefaultEdge> vf2 =
        new VF2SubgraphIsomorphismInspector<>(g1, g2);

    assertEquals(true, SubgraphIsomorphismTestUtils.containsAllMatchings(vf2, g1, g2));

    /* DET-2:
     *
     * g3 = ...   g4 = ...
     *
     */

    DirectedGraph<Integer, DefaultEdge> g3 = new DefaultDirectedGraph<>(DefaultEdge.class),
        g4 = new DefaultDirectedGraph<>(DefaultEdge.class);

    g3.addVertex(0);
    g3.addVertex(1);
    g3.addVertex(2);
    g3.addVertex(3);
    g3.addVertex(4);
    g3.addVertex(5);

    g4.addVertex(0);
    g4.addVertex(1);
    g4.addVertex(2);
    g4.addVertex(3);

    g3.addEdge(0, 1);
    g3.addEdge(0, 5);
    g3.addEdge(1, 4);
    g3.addEdge(2, 1);
    g3.addEdge(2, 4);
    g3.addEdge(3, 1);
    g3.addEdge(4, 0);
    g3.addEdge(5, 2);
    g3.addEdge(5, 4);

    g4.addEdge(0, 3);
    g4.addEdge(1, 2);
    g4.addEdge(1, 3);
    g4.addEdge(2, 3);
    g4.addEdge(2, 0);

    VF2SubgraphIsomorphismInspector<Integer, DefaultEdge> vf3 =
        new VF2SubgraphIsomorphismInspector<>(g3, g4);

    assertEquals(true, SubgraphIsomorphismTestUtils.containsAllMatchings(vf3, g3, g4));

    /* DET-3:
     *
     *      1----0        0---2
     *      |             |  /
     * g5 = |        g6 = | /
     *      |             |/
     *      2----3        1
     */

    SimpleGraph<Integer, DefaultEdge> g5 = new SimpleGraph<>(DefaultEdge.class),
        g6 = new SimpleGraph<>(DefaultEdge.class);

    g5.addVertex(0);
    g5.addVertex(1);
    g5.addVertex(2);
    g5.addVertex(3);

    g6.addVertex(0);
    g6.addVertex(1);
    g6.addVertex(2);

    g5.addEdge(0, 1);
    g5.addEdge(1, 2);
    g5.addEdge(2, 3);

    g6.addEdge(0, 1);
    g6.addEdge(1, 2);
    g6.addEdge(2, 0);

    VF2SubgraphIsomorphismInspector<Integer, DefaultEdge> vf4 =
        new VF2SubgraphIsomorphismInspector<>(g5, g6);

    assertEquals(true, SubgraphIsomorphismTestUtils.containsAllMatchings(vf4, g5, g6));
  }
  /**
   * Tests graph types: In case of invalid graph types or invalid combination of graph arguments
   * UnsupportedOperationException or InvalidArgumentException is expected
   */
  @Test
  public void testGraphTypes() {

    DirectedGraph<Integer, DefaultEdge> dg1 = new DefaultDirectedGraph<>(DefaultEdge.class);

    dg1.addVertex(1);
    dg1.addVertex(2);

    dg1.addEdge(1, 2);

    SimpleGraph<Integer, DefaultEdge> sg1 = new SimpleGraph<>(DefaultEdge.class);

    sg1.addVertex(1);
    sg1.addVertex(2);

    sg1.addEdge(1, 2);

    Multigraph<Integer, DefaultEdge> mg1 = new Multigraph<>(DefaultEdge.class);

    mg1.addVertex(1);
    mg1.addVertex(2);

    mg1.addEdge(1, 2);

    Pseudograph<Integer, DefaultEdge> pg1 = new Pseudograph<>(DefaultEdge.class);

    pg1.addVertex(1);
    pg1.addVertex(2);

    pg1.addEdge(1, 2);

    /* GT-0 test graph=null */

    try {
      @SuppressWarnings("unused")
      VF2SubgraphIsomorphismInspector<Integer, DefaultEdge> gt0 =
          new VF2SubgraphIsomorphismInspector<>(null, sg1);
      Assert.fail("Expected UnsupportedOperationException");
    } catch (NullPointerException ex) {
    }

    /* GT-1: multigraphs */

    try {
      @SuppressWarnings("unused")
      VF2SubgraphIsomorphismInspector<Integer, DefaultEdge> gt1 =
          new VF2SubgraphIsomorphismInspector<>(mg1, mg1);
      Assert.fail("Expected UnsupportedOperationException");
    } catch (UnsupportedOperationException ex) {
    }

    /* GT-2: pseudographs */

    try {
      @SuppressWarnings("unused")
      VF2SubgraphIsomorphismInspector<Integer, DefaultEdge> gt2 =
          new VF2SubgraphIsomorphismInspector<>(pg1, pg1);
      Assert.fail("Expected UnsupportedOperationException");
    } catch (UnsupportedOperationException ex) {
    }

    /* GT-3: simple graphs */

    VF2SubgraphIsomorphismInspector<Integer, DefaultEdge> gt3 =
        new VF2SubgraphIsomorphismInspector<>(sg1, sg1);
    assertEquals(true, gt3.getMappings().hasNext());

    /* GT-4: directed graphs */

    VF2SubgraphIsomorphismInspector<Integer, DefaultEdge> gt4 =
        new VF2SubgraphIsomorphismInspector<>(dg1, dg1);
    assertEquals("[1=1 2=2]", gt4.getMappings().next().toString());

    /* GT-5: simple graph + multigraph */

    try {
      @SuppressWarnings("unused")
      VF2SubgraphIsomorphismInspector<Integer, DefaultEdge> gt5 =
          new VF2SubgraphIsomorphismInspector<>(sg1, mg1);
      Assert.fail("Expected UnsupportedOperationException");
    } catch (UnsupportedOperationException ex) {
    }

    /* GT-6: simple graph + pseudograph */

    try {
      @SuppressWarnings("unused")
      VF2SubgraphIsomorphismInspector<Integer, DefaultEdge> gt6 =
          new VF2SubgraphIsomorphismInspector<>(sg1, pg1);
      Assert.fail("Expected UnsupportedOperationException");
    } catch (UnsupportedOperationException ex) {
    }

    /* GT-7: directed graph + multigraph */

    try {
      @SuppressWarnings("unused")
      VF2SubgraphIsomorphismInspector<Integer, DefaultEdge> gt7 =
          new VF2SubgraphIsomorphismInspector<>(dg1, mg1);
      Assert.fail("Expected UnsupportedOperationException");
    } catch (UnsupportedOperationException ex) {
    }

    /* GT-8: directed graph + pseudograph */

    try {
      @SuppressWarnings("unused")
      VF2SubgraphIsomorphismInspector<Integer, DefaultEdge> gt8 =
          new VF2SubgraphIsomorphismInspector<>(dg1, pg1);
      Assert.fail("Expected UnsupportedOperationException");
    } catch (UnsupportedOperationException ex) {
    }

    /* GT-9: pseudograph + multigraph */

    try {
      @SuppressWarnings("unused")
      VF2SubgraphIsomorphismInspector<Integer, DefaultEdge> gt9 =
          new VF2SubgraphIsomorphismInspector<>(pg1, mg1);
      Assert.fail("Expected UnsupportedOperationException");
    } catch (UnsupportedOperationException ex) {
    }

    /* GT-10: simple graph + directed graph */

    try {
      @SuppressWarnings("unused")
      VF2SubgraphIsomorphismInspector<Integer, DefaultEdge> gt10 =
          new VF2SubgraphIsomorphismInspector<>(sg1, dg1);
      Assert.fail("Expected IllegalArgumentException");
    } catch (IllegalArgumentException ex) {
    }
  }