!include once #1019934 // BCEL

import org.apache.bcel.classfile.Attribute;
import org.apache.bcel.classfile.SourceFile;
import org.apache.bcel.generic.*;

static void bcelRoundtrip(InputStream classFile, S fileName, IVF1<ClassGen> modifier default null, OutputStream newClassFile) ctex {
  JavaClass c = new ClassParser(classFile, fileName).parse();

  ClassGen g = new ClassGen(c);
  
  modifier?.get(g);
  
  c = g.getJavaClass();
  c.dump(newClassFile);
}