siffile = dialog.getSiffile();
genesfile = dialog.getGenefile();
limit = dialog.getLimit();
directed = dialog.getDirected();
SIFReader sifReader = new SIFReader(selectedRuleTypes);
BasicSIFGraph graph = (BasicSIFGraph) sifReader.readXMLFile(new File(siffile));
if (graph.getNodes().isEmpty())
{
MessageDialog.openInformation(main.getShell(), "Graph empty!",
"Loaded SIF file does not have any interaction of specified type.");