78 lines
2.7 KiB
C#
78 lines
2.7 KiB
C#
using DigitalData.Core.Exceptions;
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namespace EnvelopeGenerator.Application.Extensions;
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/// <summary>
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/// Extension methods for tasks
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/// </summary>
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public static class TaskExtensions
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{
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/// <summary>
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/// Awaits the specified task and ensures that the result is not <c>null</c>.
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/// If the result is <c>null</c>, the exception created by factory-method is thrown.
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/// </summary>
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/// <typeparam name="T">The type of the result.</typeparam>
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/// <typeparam name="TException">The type of the exception.</typeparam>
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/// <param name="task">The task to await.</param>
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/// <param name="factory">Exception provider</param>
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/// <returns>The awaited result if not <c>null</c>.</returns>
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/// <exception>Thrown if the result is <c>null</c>.</exception>
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public static async Task<T> ThrowIfNull<T, TException>(this Task<T?> task, Func<TException> factory) where TException : Exception
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{
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var result = await task;
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return result ?? throw factory();
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}
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/// <summary>
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/// Awaits the specified task and ensures that the result is not <c>empty</c>.
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/// If the result contains no elements, the exception created by factory-method is thrown.
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/// </summary>
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/// <typeparam name="T">The element type of the collection.</typeparam>
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/// <typeparam name="TException">The type of the exception.</typeparam>
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/// <param name="task">The task to await.</param>
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/// <param name="factory">Exception provider</param>
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/// <returns>The awaited collection if it is not <c>null</c> or empty.</returns>
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/// <exception cref="NotFoundException">Thrown if the result is <c>null</c> or empty.</exception>
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public static async Task<IEnumerable<T>> ThrowIfEmpty<T, TException>(this Task<IEnumerable<T>> task, Func<TException> factory) where TException : Exception
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{
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var result = await task;
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return result?.Any() ?? false ? result : throw factory();
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}
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/// <summary>
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///
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/// </summary>
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/// <typeparam name="T"></typeparam>
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/// <typeparam name="I"></typeparam>
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/// <param name="task"></param>
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/// <param name="act"></param>
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/// <returns></returns>
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public static async Task<I> Then<T, I>(this Task<T> task, Func<T, I> act)
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{
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var res = await task;
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return act(res);
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}
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}
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/// <summary>
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///
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/// </summary>
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public static class Exceptions
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{
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/// <summary>
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///
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/// </summary>
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public static NotFoundException NotFound() => new();
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/// <summary>
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///
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/// </summary>
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/// <returns></returns>
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public static BadRequestException BadRequest() => new();
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/// <summary>
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///
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/// </summary>
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/// <returns></returns>
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public static ForbiddenException Forbidden() => new();
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} |