public void insert(TreeableReportRow newChild, int childIndex) {
if (newChild == null) {
throw new IllegalArgumentException("new child is null");
} else if (isNodeAncestor(newChild)) {
throw new IllegalArgumentException("new child is an ancestor");
}
TreeableReportRow oldParent = (TreeableReportRow) newChild.getParent();
if (oldParent != null) {
oldParent.remove(newChild);
}
newChild.setParent(this);
if (children == null) {
children = new Vector();
}
children.insertElementAt(newChild, childIndex);
}
public void add(TreeableReportRow newChild) {
if (newChild != null && newChild.getParent() == this) insert(newChild, getChildCount() - 1);
else insert(newChild, getChildCount());
}