/// <summary>
/// Ensures that there is a value. Throws if there is not.
/// </summary>
/// <param name="result">The result.</param>
/// <exception cref="ErrorException">The exception containing the error.</exception>
public static void EnsureSuccess(this IResult result)
{
if (result.IsSuccess)
{
return;
}
else
{
IFail fail = result.AsFail();
throw new ErrorException(fail.Error, fail.Error.Message ?? string.Empty);
}
}
/// <summary>
/// Performs a mapping depending on the type of the stored value.
/// </summary>
/// <typeparam name="TValue">The type of the value.</typeparam>
/// <typeparam name="TResult">The resultant type.</typeparam>
/// <param name="result">The result.</param>
/// <param name="onSuccess">The mapping for a value.</param>
/// <param name="onError">The mapping for an error.</param>
/// <returns>The mapped result.</returns>
public static TResult Match <TValue, TResult>(this IResult result, Func <TValue?, TResult> onSuccess, Func <Error, TResult> onError)
{
if (result.IsSuccess && onSuccess != null)
{
return(onSuccess(result.AsSuccess <TValue>().Value));
}
if (result.IsSuccess == false && onError != null)
{
return(onError(result.AsFail().Error));
}
throw new InvalidOperationException();
}
/// <summary>
/// Executes one of the actions depending on the type of the stored value.
/// </summary>
/// <typeparam name="TValue">The type of the value.</typeparam>
/// <param name="result">The result.</param>
/// <param name="onSuccess">The action to execute for a value.</param>
/// <param name="onError">The action to execute for an error.</param>
public static void Switch <TValue>(this IResult result, Action <TValue?> onSuccess, Action <Error> onError)
{
if (result.IsSuccess && onSuccess != null)
{
onSuccess(result.AsSuccess <TValue>().Value);
return;
}
if (result.IsSuccess == false && onError != null)
{
onError(result.AsFail().Error);
return;
}
throw new InvalidOperationException();
}