64 lines
2.1 KiB
C#
64 lines
2.1 KiB
C#
// Copyright (c) .NET Foundation. All rights reserved.
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// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
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using System;
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using Microsoft.AspNetCore.Mvc.ActionConstraints;
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namespace Microsoft.AspNetCore.Mvc.Internal
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{
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/// <summary>
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/// A default implementation of <see cref="IActionConstraintProvider"/>.
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/// </summary>
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/// <remarks>
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/// This provider is able to provide an <see cref="IActionConstraint"/> instance when the
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/// <see cref="IActionConstraintMetadata"/> implements <see cref="IActionConstraint"/> or
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/// <see cref="IActionConstraintFactory"/>/
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/// </remarks>
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public class DefaultActionConstraintProvider : IActionConstraintProvider
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{
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/// <inheritdoc />
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public int Order => -1000;
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/// <inheritdoc />
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public void OnProvidersExecuting(ActionConstraintProviderContext context)
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{
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if (context == null)
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{
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throw new ArgumentNullException(nameof(context));
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}
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for (var i = 0; i < context.Results.Count; i++)
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{
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ProvideConstraint(context.Results[i], context.HttpContext.RequestServices);
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}
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}
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/// <inheritdoc />
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public void OnProvidersExecuted(ActionConstraintProviderContext context)
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{
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}
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private void ProvideConstraint(ActionConstraintItem item, IServiceProvider services)
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{
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// Don't overwrite anything that was done by a previous provider.
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if (item.Constraint != null)
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{
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return;
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}
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if (item.Metadata is IActionConstraint constraint)
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{
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item.Constraint = constraint;
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item.IsReusable = true;
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return;
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}
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if (item.Metadata is IActionConstraintFactory factory)
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{
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item.Constraint = factory.CreateInstance(services);
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item.IsReusable = factory.IsReusable;
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return;
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}
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}
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}
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} |