//
// Author:
//   Jb Evain (jbevain@gmail.com)
//
// Copyright (c) 2008 - 2015 Jb Evain
// Copyright (c) 2008 - 2011 Novell, Inc.
//
// Licensed under the MIT/X11 license.
//

using MonoFN.Collections.Generic;
using System;

namespace MonoFN.Cecil {

	sealed class MemberDefinitionCollection<T> : Collection<T> where T : IMemberDefinition {

		TypeDefinition container;

		internal MemberDefinitionCollection (TypeDefinition container)
		{
			this.container = container;
		}

		internal MemberDefinitionCollection (TypeDefinition container, int capacity)
			: base (capacity)
		{
			this.container = container;
		}

		protected override void OnAdd (T item, int index)
		{
			Attach (item);
		}

		protected sealed override void OnSet (T item, int index)
		{
			Attach (item);
		}

		protected sealed override void OnInsert (T item, int index)
		{
			Attach (item);
		}

		protected sealed override void OnRemove (T item, int index)
		{
			Detach (item);
		}

		protected sealed override void OnClear ()
		{
			foreach (var definition in this)
				Detach (definition);
		}

		void Attach (T element)
		{
			if (element.DeclaringType == container)
				return;

			if (element.DeclaringType != null)
				throw new ArgumentException ("Member already attached");

			element.DeclaringType = this.container;
		}

		static void Detach (T element)
		{
			element.DeclaringType = null;
		}
	}
}
