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87 lines
3.2 KiB
C#
87 lines
3.2 KiB
C#
// Kyoo - A portable and vast media library solution.
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// Copyright (c) Kyoo.
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//
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// See AUTHORS.md and LICENSE file in the project root for full license information.
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//
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// Kyoo is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// any later version.
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//
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// Kyoo is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with Kyoo. If not, see <https://www.gnu.org/licenses/>.
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using System;
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using System.Threading.Tasks;
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using JetBrains.Annotations;
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namespace Kyoo.Utils
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{
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/// <summary>
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/// A class containing helper method for tasks.
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/// </summary>
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public static class TaskUtils
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{
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/// <summary>
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/// Run a method after the execution of the task.
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/// </summary>
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/// <param name="task">The task to wait.</param>
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/// <param name="then">
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/// The method to run after the task finish. This will only be run if the task finished successfully.
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/// </param>
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/// <typeparam name="T">The type of the item in the task.</typeparam>
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/// <returns>A continuation task wrapping the initial task and adding a continuation method.</returns>
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/// <exception cref="TaskCanceledException">The source task has been canceled.</exception>
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public static Task<T> Then<T>(this Task<T> task, Action<T> then)
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{
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return task.ContinueWith(x =>
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{
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if (x.IsFaulted)
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x.Exception!.InnerException!.ReThrow();
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if (x.IsCanceled)
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throw new TaskCanceledException();
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then(x.Result);
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return x.Result;
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}, TaskContinuationOptions.ExecuteSynchronously);
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}
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/// <summary>
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/// Map the result of a task to another result.
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/// </summary>
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/// <param name="task">The task to map.</param>
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/// <param name="map">The mapper method, it take the task's result as a parameter and should return the new result.</param>
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/// <typeparam name="T">The type of returns of the given task</typeparam>
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/// <typeparam name="TResult">The resulting task after the mapping method</typeparam>
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/// <returns>A task wrapping the initial task and mapping the initial result.</returns>
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/// <exception cref="TaskCanceledException">The source task has been canceled.</exception>
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public static Task<TResult> Map<T, TResult>(this Task<T> task, Func<T, TResult> map)
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{
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return task.ContinueWith(x =>
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{
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if (x.IsFaulted)
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x.Exception!.InnerException!.ReThrow();
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if (x.IsCanceled)
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throw new TaskCanceledException();
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return map(x.Result);
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}, TaskContinuationOptions.ExecuteSynchronously);
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}
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/// <summary>
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/// A method to return the a default value from a task if the initial task is null.
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/// </summary>
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/// <param name="value">The initial task</param>
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/// <typeparam name="T">The type that the task will return</typeparam>
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/// <returns>A non-null task.</returns>
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[NotNull]
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public static Task<T> DefaultIfNull<T>([CanBeNull] Task<T> value)
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{
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return value ?? Task.FromResult<T>(default);
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}
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}
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}
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