GlobalStatsDisplay.java

        callGraph.setCellValueFactory(
            param -> new SimpleObjectProperty<RuleMatchingStats>()
            {
                @Override
                public RuleMatchingStats get()
                {
                    return param.getValue();
                }
            }
        );

        callGraph.setCellFactory(
            param -> new TableCell<RuleMatchingStats, RuleMatchingStats>()
            {
                @Override
                protected void updateItem(final RuleMatchingStats item,
                    final boolean empty)
                {
                    super.updateItem(item, empty);

                    setText(null);

                    if (empty) {
                        setGraphic(null);
                        return;
                    }

                    final ReadOnlyDoubleProperty property = param
                        .widthProperty();

                    final int nonEmptyMatches = item.getNonEmptyMatches();
                    final int emptyMatches = item.getEmptyMatches();
                    final int failedMatches = item.getFailures();
                    final int total = nonEmptyMatches + emptyMatches
                        + failedMatches;

                    final double nonEmptyRatio
                        = (double) nonEmptyMatches / total;
                    final double emptyRatio
                        = (double) emptyMatches / total;
                    final  double failureRatio
                        = (double) failedMatches / total;

                    // FIXME: unfortunately I cannot use Rectangle::new...
                    // If I do, the rectangle is not visible :/
                    final Supplier<Rectangle> supplier
                        = () -> new Rectangle(0.0, 20.0);

                    final HBox hbox = new HBox();
                    final ObservableList<Node> nodes = hbox.getChildren();

                    DoubleExpression expr;
                    Rectangle r;

                    r = supplier.get();
                    expr = property.multiply(nonEmptyRatio);
                    r.widthProperty().bind(expr);
                    r.setStyle("-fx-fill: CHART_COLOR_3");
                    nodes.add(r);

                    r = supplier.get();
                    expr = property.multiply(emptyRatio);
                    r.widthProperty().bind(expr);
                    r.setStyle("-fx-fill: CHART_COLOR_2");
                    nodes.add(r);

                    r = supplier.get();
                    expr = property.multiply(failureRatio);
                    r.widthProperty().bind(expr);
                    r.setStyle("-fx-fill: CHART_COLOR_1");
                    nodes.add(r);

                    setGraphic(hbox);
                }
            }
        );