Newtonsoft.Json/Linq/JPropertyKeyedCollection.cs

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#region License
// Copyright (c) 2007 James Newton-King
//
// 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.
#endregion

using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;

namespace Newtonsoft.Json.Linq
{
    internal class JPropertyKeyedCollection : Collection<JToken>
    {
        private static readonly IEqualityComparer<string> Comparer = StringComparer.Ordinal;

        private Dictionary<string, JToken> _dictionary;

        private void AddKey(string key, JToken item)
        {
            EnsureDictionary();
            _dictionary[key] = item;
        }

        protected void ChangeItemKey(JToken item, string newKey)
        {
            if (!ContainsItem(item))
                throw new ArgumentException("The specified item does not exist in this KeyedCollection.");

            string keyForItem = GetKeyForItem(item);
            if (!Comparer.Equals(keyForItem, newKey))
            {
                if (newKey != null)
                    AddKey(newKey, item);

                if (keyForItem != null)
                    RemoveKey(keyForItem);
            }
        }

        protected override void ClearItems()