\begin{codesource}[label=code:v2flattening,caption=Version 2 : Implémentation de la transformation d'aplatissement de hiérarchie de classes en Tom+Java.]
public static VirtualRoot v2_processClass(VirtualRoot root) {
  EList<Class> children = root.getChildren();
  EList<Class> newChildren = `cfClassEList();
  %match(children) {
    cfClassEList(_*,cl@cfClass(_,_,_,cfClassEList(),_),_*) -> {
      newChildren = `cfClassEList(flattening(cl),newChildren*); 
    }
  }
  return `cfVirtualRoot(newChildren);
}

public static Class flattening(Class toFlatten) {
  Class parent = toFlatten.getSuperclass();
  if(parent==null) {
    return toFlatten;
  } else {
    Class flattenedParent = flattening(parent);
    EList<Attribute> head = toFlatten.getAttributes();
    head.addAll(flattenedParent.getAttributes());
    return `cfClass(flattenedParent.getName()+toFlatten.getName(), head, flattenedParent.getSuperclass(), 
                                                                                           cfClassEList(), virtR);
  }
}
...
public static void main(String[] args) {
  ...
  VirtualRoot translator.virtR = v2_processClass(source_root);
  ...
}
\end{codesource}