@Override
  public TreeElement addInternal(final TreeElement first, final ASTNode last, ASTNode anchor, Boolean before) {
    TreeElement lt = (TreeElement)findChildByRole(ChildRole.LT_IN_TYPE_LIST);
    final CharTable treeCharTab = SharedImplUtil.findCharTableByTree(this);
    if (lt == null) {
      lt = Factory.createSingleLeafElement(JavaTokenType.LT, "<", 0, 1, treeCharTab, getManager());
      super.addInternal(lt, lt, getFirstChildNode(), Boolean.TRUE);
    }

    TreeElement gt = (TreeElement)findChildByRole(ChildRole.GT_IN_TYPE_LIST);
    if (gt == null) {
      gt = Factory.createSingleLeafElement(JavaTokenType.GT, ">", 0, 1, treeCharTab, getManager());
      super.addInternal(gt, gt, getLastChildNode(), Boolean.FALSE);
    }

    if (anchor == null) {
      if (before == null || before.booleanValue()){
        anchor = gt;
        before = Boolean.TRUE;
      }
      else{
        anchor = lt;
        before = Boolean.FALSE;
      }
    }

    TreeElement firstAdded = super.addInternal(first, last, anchor, before);
    if (first == last && first.getElementType() == JavaElementType.TYPE_PARAMETER) {
      JavaSourceUtil.addSeparatingComma(this, first, TYPE_PARAMETER_SET);
    }
    return firstAdded;
  }
@Override
  public TreeElement addInternal(final TreeElement first, final ASTNode last, ASTNode anchor, Boolean before)