/// <summary>
/// This changes an Optional ResultOrError into a ResultOrError by setting a Missing value to an error ResultOrError, populating it with a provided error message (if the ResultOrError
/// is already populated, whether as a Result or an Error) then the instance will be returned unaltered
/// </summary>
public static ResultOrError <T> SetErrorIfNoValue <T>(this Optional <ResultOrError <T> > source, NonBlankTrimmedString errorMessage)
{
if (errorMessage == null)
{
throw new ArgumentNullException(nameof(errorMessage));
}
return(source.GetValueOrDefault(ResultOrError <T> .FromError(errorMessage)));
}
/// <summary>
/// Given a ResultOrError of Optional T, return a ResultOrError of T by replacing a Missing T value with an Error ResultOrError of T
/// </summary>
public static ResultOrError <T> ReplaceMissingResultWithError <T>(this ResultOrError <Optional <T> > source, NonBlankTrimmedString errorMessageForMissingValue)
{
if (source == null)
{
throw new ArgumentNullException(nameof(source));
}
if (errorMessageForMissingValue == null)
{
throw new ArgumentNullException(nameof(errorMessageForMissingValue));
}
return(source.Match(
handleResult: resultIfAvailable => resultIfAvailable
.Map(result => ResultOrError.FromResult(result))
.GetValueOrDefault(ResultOrError <T> .FromError(errorMessageForMissingValue)),
handleError: errorMessage => ResultOrError <T> .FromError(errorMessage)
));
}