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Ombi/PlexRequests.UI/Helpers/ContravariantBindingResolve...

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#region Copyright
// /************************************************************************
// Copyright (c) 2016 Jamie Rees
// File: ContravariantBindingResolver.cs
// Created By: Jamie Rees
//
// 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.
// ************************************************************************/
#endregion
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Reflection;
using Ninject.Components;
using Ninject.Infrastructure;
using Ninject.Planning.Bindings;
using Ninject.Planning.Bindings.Resolvers;
namespace PlexRequests.UI.Helpers
{
public class ContravariantBindingResolver : NinjectComponent, IBindingResolver
{
/// <summary>
/// Returns any bindings from the specified collection that match the specified service.
/// </summary>
public IEnumerable<IBinding> Resolve(Multimap<Type, IBinding> bindings, Type service)
{
if (service.IsGenericType)
{
var genericType = service.GetGenericTypeDefinition();
var genericArguments = genericType.GetGenericArguments();
if (!genericArguments.Any())
{
return Enumerable.Empty<IBinding>();
}
if (genericArguments.Length == 1 && genericArguments.Single().GenericParameterAttributes.HasFlag(GenericParameterAttributes.Contravariant))
{
var argument = service.GetGenericArguments().FirstOrDefault();
if (argument == null)
{
return Enumerable.Empty<IBinding>();
}
var matches =
bindings.Where(
kvp =>
{
var assignableFrom = kvp.Key.GetGenericArguments().FirstOrDefault();
return kvp.Key.IsGenericType && kvp.Key.GetGenericTypeDefinition() == genericType &&
kvp.Key.GetGenericArguments().FirstOrDefault() != argument
&& assignableFrom.IsAssignableFrom(argument);
}).SelectMany(kvp => kvp.Value);
return matches;
}
}
return Enumerable.Empty<IBinding>();
}
}
}