//
// System.Data.Common.TaskHelper.cs
//
// Copyright (C) 2013 Pēteris Ņikiforovs
//
// 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.
//

#if NET_4_5

using System;
using System.Threading.Tasks;

namespace System.Data.Common {
	static class TaskHelper
	{
		internal static Task CreateCanceledTask ()
		{
			TaskCompletionSource<object> tsc = new TaskCompletionSource<object> ();
			tsc.SetCanceled ();
			return tsc.Task;
		}
		
		internal static Task<T> CreateCanceledTask<T> ()
		{
			TaskCompletionSource<T> tsc = new TaskCompletionSource<T> ();
			tsc.SetCanceled ();
			return tsc.Task;
		}
		
		internal static Task CreateExceptionTask (Exception e)
		{
			TaskCompletionSource<object> tsc = new TaskCompletionSource<object> ();
			tsc.SetException (e);
			return tsc.Task;
		}
		
		internal static Task<T> CreateExceptionTask<T> (Exception e)
		{
			TaskCompletionSource<T> tsc = new TaskCompletionSource<T> ();
			tsc.SetException (e);
			return tsc.Task;
		}
		
		internal static Task CreateVoidTask ()
		{
			TaskCompletionSource<object> tsc = new TaskCompletionSource<object> ();
			tsc.SetResult (null);
			return tsc.Task;
		}
	}
}

#endif