Templated Hierarchical Repeater Control

using System;
using System.Collections.Generic;
using System.Text;
using System.Collections;
using System.Web.UI;

namespace DaveControls.HierarchicalControls.Data
{
    public class HierarchyDataHelper
    {
        private const char NODE_CHAR = '.';

        internal static HierarchyDataItemBase CreateDummyDataSource(string dataHierarchy)
        {
            string workingString = dataHierarchy;

            HierarchyDataItemBase dataSource = new HierarchyDataItemBase();

            HierarchyDataItemBase currentParent = dataSource;

            for (int i = 0; i < dataHierarchy.Length; i++)
            {
                if (dataHierarchy[i] == NODE_CHAR)
                {
                    HierarchyDataItemBase newNode = new HierarchyDataItemBase();

                    currentParent.Add(newNode);
                }
                else if (dataHierarchy[i] == '(')
                {
                    // we're going down a level.  Set the current parent to be the last node that was added
                    currentParent = currentParent[currentParent.Count - 1];
                }
                else if (dataHierarchy[i] == ')')
                {
                    // we're going up a level. Set the current parent to be the parent of the last item that was added
                    if (currentParent.Parent == null)
                    {
                        // we are back to the root level again
                        currentParent = dataSource;
                    }
                    else
                    {
                        currentParent = currentParent.Parent;
                    }
                }
            }

            return dataSource;
        }

        internal static string CreateDataHierarchyString(HierarchyDataItemBase dataSource)
        {
            IEnumerator<HierarchyDataItemBase> dataEnum = (IEnumerator<HierarchyDataItemBase>)dataSource.GetEnumerator();

            StringBuilder sb = new StringBuilder();

            while (dataEnum.MoveNext())
            {
                HierarchyDataItemBase data = dataEnum.Current;

                sb.Append(NODE_CHAR);

                if (data.HasChildren)
                {
                    sb.Append("(");
                    sb.Append(CreateDataHierarchyString(data));
                    sb.Append(")");
                }
            }

            return sb.ToString();
        }
    }
}