@Override public PrepareContractionHierarchies doWork() { checkGraph(); if (prepareEncoder == null) throw new IllegalStateException("No vehicle encoder set."); if (prepareWeighting == null) throw new IllegalStateException("No weight calculation set."); allSW.start(); super.doWork(); initFromGraph(); if (!prepareEdges()) return this; if (!prepareNodes()) return this; contractNodes(); return this; }