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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.
#if !COMPONENTS
using Microsoft.AspNetCore.Http;
#else
using Microsoft.AspNetCore.Components.Routing;
#endif
namespace Microsoft.AspNetCore.Routing.Constraints;
#if !COMPONENTS
/// <summary>
/// Defines a constraint on an optional parameter. If the parameter is present, then it is constrained by InnerConstraint.
/// </summary>
public class OptionalRouteConstraint : IRouteConstraint
#else
internal class OptionalRouteConstraint : IRouteConstraint
#endif
{
/// <summary>
/// Creates a new <see cref="OptionalRouteConstraint"/> instance given the <paramref name="innerConstraint"/>.
/// </summary>
/// <param name="innerConstraint"></param>
public OptionalRouteConstraint(IRouteConstraint innerConstraint)
{
ArgumentNullException.ThrowIfNull(innerConstraint);
InnerConstraint = innerConstraint;
}
/// <summary>
/// Gets the <see cref="IRouteConstraint"/> associated with the optional parameter.
/// </summary>
public IRouteConstraint InnerConstraint { get; }
/// <inheritdoc />
public bool Match(
#if !COMPONENTS
HttpContext? httpContext,
IRouter? route,
string routeKey,
RouteValueDictionary values,
RouteDirection routeDirection)
#else
string routeKey,
RouteValueDictionary values)
#endif
{
ArgumentNullException.ThrowIfNull(routeKey);
ArgumentNullException.ThrowIfNull(values);
if (values.TryGetValue(routeKey, out _))
{
return InnerConstraint.Match(
#if !COMPONENTS
httpContext,
route,
#endif
routeKey,
#if !COMPONENTS
values,
routeDirection);
#else
values);
#endif
}
return true;
}
}
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