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// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.
namespace System.Data.Entity
{
using System;
using System.Collections.Generic;
using System.Data.Entity.Config;
/// <summary>
/// A resolver that allows to add dependency resolvers at runtime.
/// </summary>
/// <remarks>
/// This class isn't thread-safe as the tests using it aren't expected to be run in parallel.
/// </remarks>
public class MutableResolver : IDbDependencyResolver
{
private static readonly Dictionary<Type, Func<object, object>> _resolvers = new Dictionary<Type, Func<object, object>>();
private static readonly MutableResolver _instance = new MutableResolver();
private MutableResolver()
{
}
/// <inheritdoc/>
public object GetService(Type type, object key)
{
Func<object, object> resolver;
if (_resolvers.TryGetValue(type, out resolver))
{
return resolver(key);
}
return null;
}
public static MutableResolver Instance
{
get { return _instance; }
}
/// <summary>
/// Adds or replaces a resolver for a dependency of type <typeparamref name="TResolver"/>.
/// </summary>
/// <remarks>
/// Remember to call <see cref="ClearResolvers"/> from a <c>finally</c> block after using this method.
/// </remarks>
/// <typeparam name="TResolver">The type of dependency to resolve.</typeparam>
/// <param name="resolver">A delegate that takes a key object and returns a dependency instance.</param>
public static void AddResolver<TResolver>(Func<object, object> resolver)
{
_resolvers.Add(typeof(TResolver), resolver);
}
/// <summary>
/// Removes all added resolvers.
/// </summary>
public static void ClearResolvers()
{
_resolvers.Clear();
}
}
}
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