using System.Threading;
using System.Threading.Tasks;

namespace GISTech.GISDataDownloader
{
	public static class TaskCancellationExtension
	{
		public static Task WhenCanceled(this CancellationToken cancellationToken)
		{
			TaskCompletionSource<bool> taskCompletionSource = new TaskCompletionSource<bool>();
			cancellationToken.Register(delegate(object s)
			{
				((TaskCompletionSource<bool>)s).SetResult(result: true);
			}, taskCompletionSource);
			return taskCompletionSource.Task;
		}

		public static Task<T> CancelWith<T>(this Task<T> task, CancellationToken cancellationToken, bool swallowCancellationException = false)
		{
			return TaskCancellationInternals.CancelWithInternal(task, cancellationToken, swallowCancellationException);
		}

		public static Task<T> CancelWith<T>(this Task<T> task, CancellationToken cancellationToken, string message, bool swallowCancellationException = false)
		{
			return TaskCancellationInternals.CancelWithInternal(task, cancellationToken, message, swallowCancellationException);
		}

		public static Task CancelWith(this Task task, CancellationToken cancellationToken, bool swallowCancellationException = false)
		{
			return TaskCancellationInternals.CancelWithInternal(task, cancellationToken, swallowCancellationException);
		}
	}
}