/
TriedEx.cs
142 lines (120 loc) · 3.73 KB
/
TriedEx.cs
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using System;
using System.Diagnostics.CodeAnalysis;
using System.Threading.Tasks;
using NexusLabs.Contracts;
namespace NexusLabs.Framework
{
public readonly struct TriedEx<T>
{
private readonly T? _value;
private readonly Exception? _error;
public TriedEx([DisallowNull] T value)
{
ArgumentContract.RequiresNotNull(value, nameof(value));
_value = value;
_error = null;
}
public TriedEx([DisallowNull] Exception error)
{
ArgumentContract.RequiresNotNull(error, nameof(error));
_value = default;
_error = error;
}
[NotNull]
public T Value
{
get
{
if (_error != null)
{
throw new InvalidOperationException(
$"Cannot access property '{nameof(Value)}' because the " +
$"'{nameof(Error)}' property has been set. See inner exception.",
Error);
}
return _value!;
}
}
[NotNull]
public Exception Error
{
get
{
if (Success)
{
throw new InvalidOperationException(
$"Cannot access property '{nameof(Error)}' because the " +
$"'{nameof(Success)}' property has been set.");
}
return _error!;
}
}
public bool Success => _error == null;
public static implicit operator TriedEx<T>([DisallowNull] T value)
=> new(value);
public static implicit operator TriedEx<T>([DisallowNull] Exception error)
=> new(error);
public static implicit operator T([DisallowNull] TriedEx<T> tried)
=> tried.Value;
public static implicit operator Exception?([DisallowNull] TriedEx<T> tried)
=> tried.Error;
public void Deconstruct(
out bool Success,
out T? Value)
{
Success = this.Success;
Value = this.Success
? this.Value
: default;
}
public void Deconstruct(
out bool Success,
out T? Value,
out Exception? Error)
{
(Success, Value) = this;
Error = this._error;
}
public TMatch Match<TMatch>(
Func<T, TMatch> successCallback,
Func<Exception, TMatch> failCallback)
{
return Success
? successCallback(_value!)
: failCallback(_error!);
}
public void Match(
Action<T> successCallback,
Action<Exception> failCallback)
{
if (Success)
{
successCallback(_value!);
}
else
{
failCallback(_error!);
}
}
public Task<TMatch> MatchAsync<TMatch>(
Func<T, Task<TMatch>> successCallback,
Func<Exception, Task<TMatch>> failCallback)
{
return Success
? successCallback(_value!)
: failCallback(_error!);
}
public Task MatchAsync(
Func<T, Task> successCallback,
Func<Exception, Task> failCallback)
{
return Success
? successCallback(_value!)
: failCallback(_error!);
}
public override string ToString() => Success
? Convert.ToString(Value) ?? string.Empty
: $"{Error!.GetType()}: {Error.Message}\r\n" +
$"{Error.StackTrace}";
}
}