using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;



namespace Microsoft.Research.DynamicDataDisplay.Common.UndoSystem

{

	public sealed class CollectionAddAction<T> : UndoAction

	{

		private readonly ICollection<T> collection;

		private readonly T item;



		public CollectionAddAction(ICollection<T> collection, T item)

		{

			if (collection == null)

				throw new ArgumentNullException("collection");

			if (item == null)

				throw new ArgumentNullException("addedItem");



			this.collection = collection;

			this.item = item;

		}



		public override void Do()

		{

			collection.Add(item);

		}



		public override void Undo()

		{

			collection.Remove(item);

		}

	}

}