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ParameterPolicyFactory.cs
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ParameterPolicyFactory.cs
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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.Diagnostics;
using Microsoft.AspNetCore.Routing.Patterns;
namespace Microsoft.AspNetCore.Routing;
/// <summary>
/// Defines an abstraction for resolving inline parameter policies as instances of <see cref="IParameterPolicy"/>.
/// </summary>
public abstract class ParameterPolicyFactory
{
/// <summary>
/// Creates a parameter policy.
/// </summary>
/// <param name="parameter">The parameter the parameter policy is being created for.</param>
/// <param name="inlineText">The inline text to resolve.</param>
/// <returns>The <see cref="IParameterPolicy"/> for the parameter.</returns>
public abstract IParameterPolicy Create(RoutePatternParameterPart? parameter, string inlineText);
/// <summary>
/// Creates a parameter policy.
/// </summary>
/// <param name="parameter">The parameter the parameter policy is being created for.</param>
/// <param name="parameterPolicy">An existing parameter policy.</param>
/// <returns>The <see cref="IParameterPolicy"/> for the parameter.</returns>
public abstract IParameterPolicy Create(RoutePatternParameterPart? parameter, IParameterPolicy parameterPolicy);
/// <summary>
/// Creates a parameter policy.
/// </summary>
/// <param name="parameter">The parameter the parameter policy is being created for.</param>
/// <param name="reference">The reference to resolve.</param>
/// <returns>The <see cref="IParameterPolicy"/> for the parameter.</returns>
public IParameterPolicy Create(RoutePatternParameterPart? parameter, RoutePatternParameterPolicyReference reference)
{
ArgumentNullException.ThrowIfNull(reference);
Debug.Assert(reference.ParameterPolicy != null || reference.Content != null);
if (reference.ParameterPolicy != null)
{
return Create(parameter, reference.ParameterPolicy);
}
if (reference.Content != null)
{
return Create(parameter, reference.Content);
}
// Unreachable
throw new NotSupportedException();
}
}