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// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.
using System;
using System.Reactive.PlatformServices;
namespace System.Reactive.Linq
{
internal static class QueryServices
{
private static Lazy<IQueryServices> s_services = new Lazy<IQueryServices>(Initialize);
public static T GetQueryImpl<T>(T defaultInstance)
{
return s_services.Value.Extend(defaultInstance);
}
private static IQueryServices Initialize()
{
return PlatformEnlightenmentProvider.Current.GetService<IQueryServices>() ?? new DefaultQueryServices();
}
}
internal interface IQueryServices
{
T Extend<T>(T baseImpl);
}
class DefaultQueryServices : IQueryServices
{
public T Extend<T>(T baseImpl)
{
return baseImpl;
}
}
}
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