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#region Copyright
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// /************************************************************************
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// Copyright (c) 2016 Jamie Rees
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// File: ContravariantBindingResolver.cs
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// Created By: Jamie Rees
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//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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// ************************************************************************/
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#endregion
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Reflection;
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using Ninject.Components;
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using Ninject.Infrastructure;
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using Ninject.Planning.Bindings;
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using Ninject.Planning.Bindings.Resolvers;
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namespace PlexRequests.UI.Helpers
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{
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public class ContravariantBindingResolver : NinjectComponent, IBindingResolver
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{
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/// <summary>
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/// Returns any bindings from the specified collection that match the specified service.
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/// </summary>
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public IEnumerable<IBinding> Resolve(Multimap<Type, IBinding> bindings, Type service)
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{
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if (service.IsGenericType)
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{
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var genericType = service.GetGenericTypeDefinition();
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var genericArguments = genericType.GetGenericArguments();
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if (genericArguments.Length == 1 && genericArguments.Single().GenericParameterAttributes.HasFlag(GenericParameterAttributes.Contravariant))
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{
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var argument = service.GetGenericArguments().Single();
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var matches =
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bindings.Where(
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kvp =>
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kvp.Key.IsGenericType && kvp.Key.GetGenericTypeDefinition() == genericType && kvp.Key.GetGenericArguments().Single() != argument
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&& kvp.Key.GetGenericArguments().Single().IsAssignableFrom(argument)).SelectMany(kvp => kvp.Value);
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return matches;
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}
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}
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return Enumerable.Empty<IBinding>();
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}
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}
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}
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tidusjar
8 years ago