Cosmos/source2/Users/Matthijs ter Woord/Testing/ReflectionToEcmaCil/OurHashset.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Collections;

namespace ReflectionToEcmaCil
{
    public class OurHashSet<T> : IEnumerable<T>
    {
        private Dictionary<int, T> mItems = new Dictionary<int, T>();

        public bool Contains(T aItem)
        {
            if (aItem == null)
            {
                throw new ArgumentNullException("aItem");
            }
            return mItems.ContainsKey(aItem.GetHashCode());
        }

        public void Add(T aItem)
        {
            if (aItem == null)
            {
                throw new ArgumentNullException("aItem");
            }
            mItems.Add(aItem.GetHashCode(), aItem);
        }

        public IEnumerator<T> GetEnumerator()
        {
            return (from item in mItems
                    select item.Value).GetEnumerator();
        }

        public T GetItemInList(T aItem)
        {
            if (aItem == null)
            {
                throw new ArgumentNullException("aItem");
            }
            T xResult;
            if (mItems.TryGetValue(aItem.GetHashCode(), out xResult))
            {
                return xResult;
            }
            else
            {
                return aItem;
            }
        }

        IEnumerator IEnumerable.GetEnumerator()
        {
            return (from item in mItems
                    select item.Value).GetEnumerator();
        }
    }
}