Newtonsoft.Json/Serialization/DefaultReferenceResolver.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 Newtonsoft.Json.Utilities;
using System.Globalization;

namespace Newtonsoft.Json.Serialization
{
    internal class DefaultReferenceResolver : IReferenceResolver
    {
        private int _referenceCount;

        private BidirectionalDictionary<string, object> GetMappings(object context)
        {
            JsonSerializerInternalBase internalSerializer;

            if (context is JsonSerializerInternalBase)
                internalSerializer = (JsonSerializerInternalBase)context;
            else if (context is JsonSerializerProxy)
                internalSerializer = ((JsonSerializerProxy)context).GetInternalSerializer();
            else
                throw new JsonException("The DefaultReferenceResolver can only be used internally.");

            return internalSerializer.DefaultReferenceMappings;
        }

        public object ResolveReference(object context, string reference)
        {
            object value;
            GetMappings(context).TryGetByFirst(reference, out value);
            return value;
        }

        public string GetReference(object context, object value)
        {
            var mappings = GetMappings(context);