code: public void displayState() {
          PrintWriter xout = context.get(Log.logKey).getWriter(Log.WriterKind.STDERR);
          xout.println("File Object History : " +  fileObjectHistory);
          xout.println("Open Type Names     : " +  openTypeNames);
          xout.println("Gen. Src Names      : " +  generatedSourceNames);
          xout.println("Gen. Cls Names      : " +  generatedClasses.keySet());
          xout.println("Agg. Gen. Src Names : " +  aggregateGeneratedSourceNames);
          xout.println("Agg. Gen. Cls Names : " +  aggregateGeneratedClassNames);
      }
docs: Debugging function to display internal state.