@Override
  public ASTNode findChildByRole(int role) {
    LOG.assertTrue(ChildRole.isUnique(role));
    switch(role){
      case ChildRole.MODIFIER_LIST:
        return findChildByType(MODIFIER_LIST);

      case ChildRole.METHOD_BODY:
        return findChildByType(CODE_BLOCK);

      default:
        return null;
    }
  }
@Override
  public ASTNode findChildByRole(int role)