public boolean execute() {
    GraphModel graphModel = workspace.getLookup().lookup(GraphModel.class);
    Graph graph = null;
    if (exportVisible) {
      graph = graphModel.getGraphVisible();
    } else {
      graph = graphModel.getGraph();
    }
    try {
      exportData(graph);
    } catch (Exception e) {
      throw new RuntimeException(e);
    }

    return !cancel;
  }
  private void executeDynamic(DynamicStatistics statistics, DynamicLongTask dynamicLongTask) {
    GraphController graphController = Lookup.getDefault().lookup(GraphController.class);
    GraphModel graphModel = graphController.getGraphModel();

    double window = statistics.getWindow();
    double tick = statistics.getTick();

    GraphView currentView = graphModel.getVisibleView();
    Interval bounds = statistics.getBounds();
    if (bounds == null) {
      if (currentView.isMainView()) {
        bounds = graphModel.getTimeBounds();
      } else {
        bounds = currentView.getTimeInterval();
      }
      statistics.setBounds(bounds);
    }

    if (dynamicLongTask != null) {
      // Count
      int c = (int) ((bounds.getHigh() - window - bounds.getLow()) / tick);
      dynamicLongTask.start(c);
    }

    // Init
    statistics.execute(graphModel);

    // Loop
    for (double low = bounds.getLow(); low <= bounds.getHigh() - window; low += tick) {
      double high = low + window;

      Graph graph = graphModel.getGraphVisible();

      graph.writeLock();

      GraphView view = graphModel.createView();
      Subgraph g = graphModel.getGraph(view);

      TimeIndex<Node> nodeIndex = graphModel.getNodeTimeIndex(currentView);
      if (Double.isInfinite(nodeIndex.getMinTimestamp())
          && Double.isInfinite(nodeIndex.getMaxTimestamp())) {
        for (Node node : graph.getNodes()) {
          g.addNode(node);
        }
      } else {
        for (Node node : nodeIndex.get(new Interval(low, high))) {
          g.addNode(node);
        }
      }

      TimeIndex<Edge> edgeIndex = graphModel.getEdgeTimeIndex(currentView);
      if (Double.isInfinite(edgeIndex.getMinTimestamp())
          && Double.isInfinite(edgeIndex.getMaxTimestamp())) {
        for (Edge edge : graph.getEdges()) {
          if (g.contains(edge.getSource()) && g.contains(edge.getTarget())) {
            g.addEdge(edge);
          }
        }
      } else {
        for (Edge edge : edgeIndex.get(new Interval(low, high))) {
          if (g.contains(edge.getSource()) && g.contains(edge.getTarget())) {
            g.addEdge(edge);
          }
        }
      }

      graph.writeUnlock();

      statistics.loop(g.getView(), new Interval(low, high));

      // Cancelled?
      if (dynamicLongTask != null && dynamicLongTask.isCancelled()) {
        return;
      } else if (dynamicLongTask != null) {
        dynamicLongTask.progress();
      }
    }
    statistics.end();
    model.addReport(statistics);
  }