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mfgames-nitride-cil/src/MfGames.Nitride.Temporal/FilterOutExpiredInstant.cs

57 lines
1.3 KiB
C#

using System.Collections.Generic;
using System.Threading;
using FluentValidation;
using MfGames.Gallium;
using MfGames.Nitride.Generators;
using NodaTime;
namespace MfGames.Nitride.Temporal;
/// <summary>
/// Filters out all expired entities that are before the expiration.
/// </summary>
[WithProperties]
public partial class FilterOutExpiredInstant : OperationBase
{
private readonly IValidator<FilterOutExpiredInstant> validator;
public FilterOutExpiredInstant(
IValidator<FilterOutExpiredInstant> validator,
TimeService clock)
{
this.validator = validator;
this.TimeService = clock;
}
public TimeService TimeService { get; set; }
/// <inheritdoc />
public override IEnumerable<Entity> Run(
IEnumerable<Entity> input,
CancellationToken cancellationToken = default)
{
this.validator.ValidateAndThrow(this);
if (!this.TimeService.Expiration.HasValue)
{
return input;
}
return input.SelectEntity<Instant, CanExpire>(this.IsNotExpired);
}
private Entity? IsNotExpired(
Entity entity,
Instant instant,
CanExpire _)
{
Instant expiration = this.TimeService.Expiration!.Value;
bool isExpired = instant.CompareTo(expiration) < 0;
return isExpired ? null : entity;
}
}