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InstanceDecorator.cs
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InstanceDecorator.cs
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// This software is part of the Autofac IoC container
// Copyright © 2018 Autofac Contributors
// https://autofac.org
//
// Permission is hereby granted, free of charge, to any person
// obtaining a copy of this software and associated documentation
// files (the "Software"), to deal in the Software without
// restriction, including without limitation the rights to use,
// copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following
// conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
// OTHER DEALINGS IN THE SOFTWARE.
using System.Collections.Generic;
using System.Linq;
using Autofac.Core;
using Autofac.Core.Registration;
namespace Autofac.Features.Decorators
{
internal static class InstanceDecorator
{
internal static object TryDecorateRegistration(
IComponentRegistration registration,
object instance,
IComponentContext context,
IEnumerable<Parameter> parameters)
{
var instanceType = instance.GetType();
// Issue #965: Do not apply the decorator if already applied, or if the registration is for an adapter.
if (registration.IsAdapting() || registration.Activator.LimitType != instanceType) return instance;
var decoratorRegistrations = context.ComponentRegistry.DecoratorsFor(registration);
// ReSharper disable once PossibleMultipleEnumeration
if (!decoratorRegistrations.Any()) return instance;
// ReSharper disable once PossibleMultipleEnumeration
var decorators = decoratorRegistrations
.Select(r => new
{
Registration = r,
Service = r.Services.OfType<DecoratorService>().First()
})
.ToArray();
if (decorators.Length == 0) return instance;
var serviceType = decorators[0].Service.ServiceType;
var resolveParameters = parameters as Parameter[] ?? parameters.ToArray();
var decoratorContext = DecoratorContext.Create(instanceType, serviceType, instance);
foreach (var decorator in decorators)
{
if (!decorator.Service.Condition(decoratorContext)) continue;
var serviceParameter = new TypedParameter(serviceType, instance);
var contextParameter = new TypedParameter(typeof(IDecoratorContext), decoratorContext);
var invokeParameters = resolveParameters.Concat(new Parameter[] { serviceParameter, contextParameter });
instance = context.ResolveComponent(decorator.Registration, invokeParameters);
decoratorContext = decoratorContext.UpdateContext(instance);
}
return instance;
}
}
}