source: branches/HeuristicLab.Problems.GrammaticalOptimization/DynamicDataDisplay/Common/UndoSystem/CollectionRemoveAction.cs @ 13757

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

namespace Microsoft.Research.DynamicDataDisplay.Common.UndoSystem
{
  public sealed class CollectionRemoveAction<T> : UndoAction
  {
    private readonly IList<T> collection;
    private readonly T item;
    private readonly int index;

    public CollectionRemoveAction(IList<T> collection, T item, int index)
    {
      if (collection == null)
        throw new ArgumentNullException("collection");
      if (item == null)
        throw new ArgumentNullException("addedItem");

      this.collection = collection;
      this.item = item;
      this.index = index;
    }

    public override void Do()
    {
      collection.Remove(item);
    }

    public override void Undo()
    {
      collection.Insert(index, item);
    }
  }
}