public OutcomeFinalizer <T, ReturnType> Catch <ExceptionType>(Func <ExceptionType, ReturnType> handler) where ExceptionType : Exception
{
if (!_isHandled && !_outcome.IsSuccessful && _outcome.FailureOrThrow().AsException() is ExceptionType exception)
{
_isHandled = true;
_returnValue = handler(exception);
}
return(this);
}
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 <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> Catch <T>(this Outcome <T> @this, Func <Failure, T> fn)
{
if (IsIgnorable(@this))
{
return(@this);
}
return(Outcome.Of(() => fn(@this.FailureOrThrow())));
}
public static Outcome <T> Catch <T>(this Outcome <T> @this, Filter filter, Func <Failure, T> fn)
{
if (!IsCatchable(@this, filter))
{
return(@this);
}
return(Outcome.Of(() => fn(@this.FailureOrThrow())));
}
public static Outcome <T> TapFailure <T>(this Outcome <T> @this, Action <Failure> action)
{
if (IsIgnorable(@this))
{
return(@this);
}
return(Try(() => {
action(@this.FailureOrThrow());
return ToKnownFailed(@this);
}));
}
public static Outcome <T> TapFailure <T>(this Outcome <T> @this, Func <Failure, bool> filter, Action <Failure> action)
{
if (!IsCatchable(@this, filter))
{
return(@this);
}
return(Try(() => {
action(@this.FailureOrThrow());
return ToKnownFailed(@this);
}));
}
public static Outcome <T> Catch <T>(this Outcome <T> @this, Func <Failure, Outcome <T> > fn)
{
if (IsIgnorable(@this))
{
return(@this);
}
try
{
return(fn(@this.FailureOrThrow()));
}
catch (Exception ex)
{
return(Fail(ex));
}
}
public static Outcome <T> Filter <T>(this Outcome <T> @this, T matchValue, IComparer <T> comparer)
{
if (IsUnprocessable(@this))
{
return(@this);
}
T result = @this.IsSuccessful ? @this.ResultOrThrow() : (@this.FailureOrThrow() as ExpectationFailure <T>).ResultAtSource;
if (comparer.Compare(result, matchValue) != 0)
{
return(new ExpectationFailure <T>(result));
}
return(@this);
}
public static Outcome <T> Catch <T>(this Outcome <T> @this, Filter filter, Func <Failure, Outcome <T>, Outcome <T> > fn)
{
if (!IsCatchable(@this, filter))
{
return(@this);
}
try
{
return(fn(@this.FailureOrThrow(), ToKnownFailed(@this)));
}
catch (Exception ex)
{
return(Fail(ex));
}
}
/// <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 Outcome <T> Filter <T>(this Outcome <T> @this, Func <T, bool> predicate)
{
if (IsUnprocessable(@this))
{
return(@this);
}
T result = @this.IsSuccessful ? @this.ResultOrThrow() : (@this.FailureOrThrow() as ExpectationFailure <T>).ResultAtSource;
return(Try(() => {
if (!predicate(result))
{
return new ExpectationFailure <T>(result);
}
return @this;
}));
}
/// <summary>
/// Applies the given async 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 async function to be applied.</param>
/// <returns>The enumerable of results.</returns>
public static async Task <Outcome <IEnumerable <TResult> > > MapAll <T, TResult>(
this Outcome <IEnumerable <T> > @this,
Func <Task <TResult> > fn)
{
if (@this.IsSuccessful)
{
var source = @this.ResultOrDefault(Enumerable.Empty <T>());
int count = source is ICollection c ? c.Count : 5;
var dest = new List <TResult>(count);
return(await Utility.Try <IEnumerable <TResult> >(async() => {
foreach (var item in source)
{
dest.Add(await fn());
}
return dest;
}));
}
return(@this.FailureOrThrow());
}
public static Outcome <Nop> DiscardResult <T>(this Outcome <T> @this) => @this.IsSuccessful ? Outcome.Any() : Outcome.Reject(@this.FailureOrThrow());
