public boolean add_via_padstack(LibPadstack p_padstack){
  if (p_padstack == null)   return false;
  if (get_via_padstack(p_padstack.pads_name) != null)   return false;
  via_padstacks.add(p_padstack);
  return true;
}

public boolean add_via_padstack ( LibPadstack p_padstack ) { if ( p_padstack == null ) return false ; if ( get_via_padstack ( p_padstack . pads_name ) != null ) return false ; via_padstacks . add ( p_padstack ) ; return true ; }
apppends p_padstack to the list of via padstacks . returns false , if the list contains already a padstack with p_padstack . name .
