public boolean requireUpdate() { if (graph == null) { // Try to get a graph GraphModel graphModel = controller.getModel(); if (graphModel != null) { graph = graphModel.getHierarchicalGraphVisible(); } } // Refresh reader if sight changed Graph g = graph; if (g != null) { if (g.getGraphModel().getVisibleView().getViewId() != graphView) { reset(); } return g.getNodeVersion() > nodeVersion || g.getEdgeVersion() > edgeVersion; } return false; }