public void addRenamingCallback(OneSheeldRenamingCallback renamingCallback){
  if (renamingCallback != null && !renamingCallbacks.contains(renamingCallback))   renamingCallbacks.add(renamingCallback);
}

public void addRenamingCallback ( OneSheeldRenamingCallback renamingCallback ) { if ( renamingCallback != null && ! renamingCallbacks . contains ( renamingCallback ) ) renamingCallbacks . add ( renamingCallback ) ; }
add a renaming callback .
