public static Outcome <TResult> Reduce <T, TResult>(
this Outcome <IEnumerable <T> > @this,
Func <TResult, T, Outcome <TResult> > generator)
{
if ([email protected])
{
return(Outcome <TResult> .Reject(@this.FailureOrThrow()));
}
var parameters = @this.ResultOrDefault();
TResult previous = default;
foreach (var param in parameters)
{
var current = generator(previous, param);
if (current.IsSuccessful)
{
previous = current.ResultOrDefault();
}
else
{
return(Outcome <TResult> .Reject(
$"{nameof(generator)} function failed for the parameter value {param}"));
}
}
return(previous);
}
public static Outcome <ResultType> Map <T, ResultType>(this Outcome <T> @this, Func <T, ValueTuple <ResultType, Failure> > fn)
{
if ([email protected])
{
return(Outcome <ResultType> .Reject(@this.FailureOrNull()));
}
return(Try <ResultType>(() => fn(@this.ResultOrDefault())));
}
public static Outcome <ResultType> Map <T, ResultType>(this Outcome <T> @this, Func <ResultType> fn)
{
if ([email protected])
{
return(Outcome <ResultType> .Reject(@this.FailureOrNull()));
}
return(Outcome.Of(fn));
}
public static Outcome <IEnumerable <ResultType> > ThenForEach <T, ResultType>(this Outcome <IEnumerable <T> > @this, Func <ResultType> fn)
{
if ([email protected])
{
return(Outcome <IEnumerable <ResultType> > .Reject(@this.FailureOrThrow()));
}
return(Outcome.Of(() => @this.ResultOrDefault(Enumerable.Empty <T>()).Select(_ => fn())));
}
public static Outcome <T> Fail <T>(this Outcome <T> @this, Func <Failure> fn)
{
if ([email protected])
{
return(@this);
}
return(Outcome <T> .Reject(fn()));
}
public static async Task <Outcome <T> > Fail <T>(this Outcome <T> @this, Func <T, Task <Failure> > fn)
{
if ([email protected])
{
return(@this);
}
return(Outcome <T> .Reject(await fn(@this.ResultOrDefault())));
}
public static Outcome <ResultType> Then <T, ResultType>(this Outcome <T> @this, Func <T, ResultType> fn)
{
if ([email protected])
{
return(Outcome <ResultType> .Reject(@this.FailureOrNull()));
}
return(Outcome.Of(() => fn(@this.ResultOrDefault())));
}
public static async Task <Outcome <T> > Fail <T>(this Task <Outcome <T> > promise, Func <Task <Failure> > fn)
{
var @this = await promise;
if ([email protected])
{
return(@this);
}
return(Outcome <T> .Reject(await fn()));
}
public static async Task <Outcome <ReturnType> > Then <T, ReturnType>(this Outcome <T> outcome, Func <T, Task <Outcome <ReturnType> > > asyncFunc)
{
return(await Try(async() => {
if (outcome.IsSuccessful)
{
return await asyncFunc(outcome.ResultOrDefault());
}
return Outcome <ReturnType> .Reject(outcome.FailureOrNull());
}));
}
public static Task <Outcome <ReturnType> > Map <T, ReturnType>(this Outcome <T> outcome, Func <Task <ReturnType> > asyncFunc)
{
if (outcome.IsSuccessful)
{
return(Outcome.Of(asyncFunc));
}
return(Outcome <ReturnType>
.Reject(outcome.FailureOrNull())
.ForAsync());
}
public static async Task <Outcome <T> > Then <T>(this Task <Outcome <T> > @this, bool condition, Func <Task <Failure> > fn)
{
if (!condition)
{
return(await @this);
}
var failure = await fn();
return(Outcome <T> .Reject(failure));
}
public static async Task <Outcome <ResultType> > Map <T, ResultType>(this Task <Outcome <T> > asyncPromise, Func <ResultType> func) //where ResultType: class
{
return(await Try(async() => {
var outcome = await asyncPromise;
if (outcome.IsSuccessful)
{
return Outcome.Of(func);
}
return Outcome <ResultType> .Reject(outcome.FailureOrNull());
}));
}
public static async Task <Outcome <ReturnType> > Map <T, ReturnType>(this Task <Outcome <T> > asyncPromise, Func <Task <Outcome <ReturnType> > > aysncFunc)
{
return(await Try(async() => {
var outcome = await asyncPromise;
if (outcome.IsSuccessful)
{
return await aysncFunc();
}
return Outcome <ReturnType> .Reject(outcome.FailureOrNull());
}));
}
public static async Task <Outcome <ResultType> > Map <T, ResultType>(this Task <Outcome <T> > asyncPromise, Func <T, Outcome <ResultType> > func)
{
return(await Try(async() => {
var outcome = await asyncPromise;
if (outcome.IsSuccessful)
{
return func(outcome.ResultOrDefault());
}
return Outcome <ResultType> .Reject(outcome.FailureOrNull());
}));
}
public static async Task <Outcome <ReturnValue> > Then <T, ReturnValue>(this Task <Outcome <T> > asyncPromise, Func <T, Task <Outcome <ReturnValue> > > aysncFunc)
{
return(await Try(async() => {
var outcome = await asyncPromise;
if (outcome.IsSuccessful)
{
return await aysncFunc(outcome.ResultOrDefault());
}
return Outcome <ReturnValue> .Reject(outcome.FailureOrNull());
}));
}
public static Task <Outcome <ReturnType> > Map <T, ReturnType>(this Outcome <T> outcome, Func <T, Task <Outcome <ReturnType> > > asyncFunc)
{
return(Try(() => {
if (outcome.IsSuccessful)
{
return asyncFunc(outcome.ResultOrDefault());
}
return Outcome <ReturnType>
.Reject(outcome.FailureOrNull())
.ForAsync();
}));
}
/// <summary>
/// Applies the given function on all elements of the input enumerable and
/// returns an enumerable of the results.
/// </summary>
/// <typeparam name="TResult">The return type of the generator function.</typeparam>
/// <typeparam name="TParam">The element type of the input enumerable.</typeparam>
/// <param name="parameters">The input enumerable.</param>
/// <param name="generator">The function to be applied.</param>
/// <returns>The enumerable of results.</returns>
public static Outcome <IEnumerable <TResult> > MapAll <T, TResult>(
this Outcome <IEnumerable <T> > @this,
Func <T, TResult> fn)
{
if ([email protected])
{
return(Outcome <IEnumerable <TResult> >
.Reject(@this.FailureOrThrow()));
}
return(Outcome.Of(
() => @this
.ResultOrDefault(Enumerable.Empty <T>())
.Select(r => fn(r))
));
}
public static async Task <Outcome <T> > Of <T>(Task <T> task)
{
_ = task ?? throw new ArgumentNullException(nameof(task));
try
{
var result = await task.ConfigureAwait(false);
return(new Outcome <T>(result));
}
#pragma warning disable CA1031 // Do not catch general exception types
catch (Exception ex)
{
return(Outcome <T> .Reject(ex));
}
#pragma warning restore CA1031 // Do not catch general exception types
}
public static Outcome <T> Of <T>(Func <T> func)
{
_ = func ?? throw new ArgumentNullException(nameof(func));
try
{
var result = func();
return(new Outcome <T>(result));
}
#pragma warning disable CA1031 // Do not catch general exception types
catch (Exception e)
{
return(Outcome <T> .Reject(e.Message, e));
}
#pragma warning restore CA1031 // Do not catch general exception types
}
public static async Task <Outcome <TResult> > Reduce <T, TResult>(
this Task <Outcome <IEnumerable <T> > > input,
Func <TResult, T, Task <Outcome <TResult> > > generator)
{
Outcome <IEnumerable <T> > @this;
try
{
@this = await input;
}
catch (Exception ex)
{
return(Outcome <TResult> .Reject(ex));
}
if ([email protected])
{
return(Outcome <TResult> .Reject(@this.FailureOrThrow()));
}
var parameters = @this.ResultOrDefault();
TResult previous = default;
foreach (var param in parameters)
{
var current = await generator(previous, param);
if (current.IsSuccessful)
{
previous = current.ResultOrDefault();
}
else
{
return(Outcome <TResult> .Reject(
$"{nameof(generator)} function failed for the parameter value {param}"));
}
}
return(previous);
}
/// <summary>
/// Applies the given function on all elements of the input enumerable and
/// returns an enumerable of the results.
/// </summary>
/// <typeparam name="TResult">The return type of the generator function.</typeparam>
/// <typeparam name="TParam">The element type of the input enumerable.</typeparam>
/// <param name="parameters">The input enumerable.</param>
/// <param name="generator">The function to be applied.</param>
/// <returns>The enumerable of restuls.</returns>
public static async Task <Outcome <IEnumerable <TResult> > > MapAll <T, TResult>(
this Task <Outcome <IEnumerable <T> > > asyncOutcome,
Func <T, TResult> fn)
{
return(await Utility.Try(async() => {
var @this = await asyncOutcome;
if ([email protected])
{
Outcome <IEnumerable <TResult> >
.Reject(@this.FailureOrThrow());
}
var source = @this.ResultOrDefault(Enumerable.Empty <T>());
int count = source is ICollection c ? c.Count : 5;
var dest = new List <TResult>(count);
foreach (var item in source)
{
dest.Add(fn(item));
}
return new Outcome <IEnumerable <TResult> >(dest);
}));
}
internal static Outcome <T> ToKnownFailed <T>(Outcome <T> failed)
{
Debug.Assert(!failed.IsSuccessful);
return(Outcome <T> .Reject(new KnownFailure(failed.FailureOrNull())));
}
public static Outcome <T> Fail <T>(string reason) => Outcome <T> .Reject(reason);
public static Outcome <T> Then <T>(this Outcome <T> @this, bool condition, Func <Failure> fn) => condition? @this.Then(() => Outcome <T> .Reject(fn())) : @this;
public static Task <Outcome <T> > FailAsync <T>(string reason) => Outcome <T> .Reject(reason).ForAsync();
public static Outcome <Nop> DiscardResult <T>(this Outcome <T> @this) => @this.IsSuccessful ? Outcome.Any() : Outcome.Reject(@this.FailureOrThrow());