// Copyright (c) AlphaSierraPapa for the SharpDevelop Team (for details please see \doc\copyright.txt)
// This code is distributed under the GNU LGPL (for details please see \doc\license.txt)

using System;
using System.Collections.ObjectModel;

namespace ICSharpCode.AvalonEdit.Utils
{
	/// <summary>
	/// A collection that cannot contain null values.
	/// </summary>
	[Serializable]
	public class NullSafeCollection<T> : Collection<T> where T : class
	{
		/// <inheritdoc/>
		protected override void InsertItem(int index, T item)
		{
			if (item == null)
				throw new ArgumentNullException("item");
			base.InsertItem(index, item);
		}
		
		/// <inheritdoc/>
		protected override void SetItem(int index, T item)
		{
			if (item == null)
				throw new ArgumentNullException("item");
			base.SetItem(index, item);
		}
	}
}