OpenGenericRegistrationSource.cs

// This software is part of the Autofac IoC container
// Copyright © 2011 Autofac Contributors
// http://autofac.org
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using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using Autofac.Builder;
using Autofac.Core;
using Autofac.Core.Activators.Reflection;

namespace Autofac.Features.OpenGenerics
{
    /// <summary>
    /// Generates activators for open generic types.
    /// </summary>
    internal class OpenGenericRegistrationSource : IRegistrationSource
    {
        private readonly RegistrationData _registrationData;
        private readonly ReflectionActivatorData _activatorData;

        public OpenGenericRegistrationSource(
            RegistrationData registrationData,
            ReflectionActivatorData activatorData)
        {
            if (registrationData == null) throw new ArgumentNullException(nameof(registrationData));
            if (activatorData == null) throw new ArgumentNullException(nameof(activatorData));

            OpenGenericServiceBinder.EnforceBindable(activatorData.ImplementationType, registrationData.Services);

            _registrationData = registrationData;
            _activatorData = activatorData;
        }

        public IEnumerable<IComponentRegistration> RegistrationsFor(Service service, Func<Service, IEnumerable<IComponentRegistration>> registrationAccessor)
        {
            if (service == null) throw new ArgumentNullException(nameof(service));
            if (registrationAccessor == null) throw new ArgumentNullException(nameof(registrationAccessor));

            Type constructedImplementationType;
            Service[] services;
            if (OpenGenericServiceBinder.TryBindServiceType(service, _registrationData.Services, _activatorData.ImplementationType, out constructedImplementationType, out services))
            {
                yield return RegistrationBuilder.CreateRegistration(
                    Guid.NewGuid(),
                    _registrationData,
                    new ReflectionActivator(constructedImplementationType, _activatorData.ConstructorFinder, _activatorData.ConstructorSelector, _activatorData.ConfiguredParameters, _activatorData.ConfiguredProperties),
                    services);
            }
        }

        public bool IsAdapterForIndividualComponents => false;

        public override string ToString()
        {
            return string.Format(
                CultureInfo.CurrentCulture,
                OpenGenericRegistrationSourceResources.OpenGenericRegistrationSourceDescription,
                _activatorData.ImplementationType.FullName,
                string.Join(", ", _registrationData.Services.Select(s => s.Description).ToArray()));
        }
    }
}