// Copyright (c) 2014 AlphaSierraPapa for the SharpDevelop Team
// 
// Permission is hereby granted, free of charge, to any person obtaining a copy of this
// software and associated documentation files (the "Software"), to deal in the Software
// without restriction, including without limitation the rights to use, copy, modify, merge,
// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
// to whom the Software is furnished to do so, subject to the following conditions:
// 
// The above copyright notice and this permission notice shall be included in all copies or
// substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.

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);
		}
	}
}