Initial Commit

Common/UndoSystem/CollectionAddAction.cs

@@ -0,0 +1,34 @@
+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);
+		}
+	}
+}