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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
using System.Globalization;
namespace Microsoft.AspNetCore.Routing;
/// <summary>
/// An <see cref="IEqualityComparer{Object}"/> implementation that compares objects as-if
/// they were route value strings.
/// </summary>
/// <remarks>
/// Values that are are not strings are converted to strings using
/// <c>Convert.ToString(x, CultureInfo.InvariantCulture)</c>. <c>null</c> values are converted
/// to the empty string.
///
/// strings are compared using <see cref="StringComparison.OrdinalIgnoreCase"/>.
/// </remarks>
#if !COMPONENTS
public class RouteValueEqualityComparer : IEqualityComparer<object?>
#else
internal class RouteValueEqualityComparer : IEqualityComparer<object?>
#endif
{
/// <summary>
/// A default instance of the <see cref="RouteValueEqualityComparer"/>.
/// </summary>
public static readonly RouteValueEqualityComparer Default = new RouteValueEqualityComparer();
/// <inheritdoc />
public new bool Equals(object? x, object? y)
{
var stringX = x as string ?? Convert.ToString(x, CultureInfo.InvariantCulture);
var stringY = y as string ?? Convert.ToString(y, CultureInfo.InvariantCulture);
if (string.IsNullOrEmpty(stringX) && string.IsNullOrEmpty(stringY))
{
return true;
}
else
{
return string.Equals(stringX, stringY, StringComparison.OrdinalIgnoreCase);
}
}
/// <inheritdoc />
public int GetHashCode(object obj)
{
var stringObj = obj as string ?? Convert.ToString(obj, CultureInfo.InvariantCulture);
if (string.IsNullOrEmpty(stringObj))
{
return StringComparer.OrdinalIgnoreCase.GetHashCode(string.Empty);
}
else
{
return StringComparer.OrdinalIgnoreCase.GetHashCode(stringObj);
}
}
}
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