﻿#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.Collections.Generic;

namespace Microsoft.Identity.Json.Linq
{
    /// <summary>
    /// Compares tokens to determine whether they are equal.
    /// </summary>
    internal class JTokenEqualityComparer : IEqualityComparer<JToken>
    {
        /// <summary>
        /// Determines whether the specified objects are equal.
        /// </summary>
        /// <param name="x">The first object of type <see cref="JToken"/> to compare.</param>
        /// <param name="y">The second object of type <see cref="JToken"/> to compare.</param>
        /// <returns>
        /// <c>true</c> if the specified objects are equal; otherwise, <c>false</c>.
        /// </returns>
        public bool Equals(JToken x, JToken y)
        {
            return JToken.DeepEquals(x, y);
        }

        /// <summary>
        /// Returns a hash code for the specified object.
        /// </summary>
        /// <param name="obj">The <see cref="System.Object"/> for which a hash code is to be returned.</param>
        /// <returns>A hash code for the specified object.</returns>
        /// <exception cref="System.ArgumentNullException">The type of <paramref name="obj"/> is a reference type and <paramref name="obj"/> is <c>null</c>.</exception>
        public int GetHashCode(JToken obj)
        {
            if (obj == null)
            {
                return 0;
            }

            return obj.GetDeepHashCode();
        }
    }
}