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

      case ChildRole.ARGUMENT_LIST:
        return findChildByType(JavaElementType.EXPRESSION_LIST);

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