62 lines
1.9 KiB
C#
62 lines
1.9 KiB
C#
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using System;
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using System.Collections.Generic;
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using System.Text.RegularExpressions;
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using Gallium;
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using NodaTime;
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using Zio;
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namespace Nitride.Temporal
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{
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/// <summary>
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/// Sets the instant in the file based on the path of the entity. This
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/// defaults to a generous regular expression that handles most formats of
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/// four digit year, a separator, two digit month, a separator, and a two
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/// digit day of month.
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/// </summary>
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[WithProperties]
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public partial class SetInstantFromPath : NitrideOperationBase
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{
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private readonly NitrideClock clock;
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public SetInstantFromPath(NitrideClock clock)
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{
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this.clock = clock;
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this.PathRegex = new Regex(
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@"(?<year>\d{4})[/-](?<month>\d{2})[/-](?<day>\d{2})");
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}
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/// <summary>
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/// Gets or sets a regular expression that has three named expressions:
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/// year, month, and day.
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/// </summary>
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public Regex? PathRegex { get; set; }
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/// <inheritdoc />
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public override IEnumerable<Entity> Run(IEnumerable<Entity> input)
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{
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this.CheckNotNull(nameof(this.PathRegex), this.PathRegex);
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return input.ForEachEntity<UPath>(this.Set);
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}
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private Entity Set(Entity entity, UPath path)
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{
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// See if the path matches the given expression.
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Match match = this.PathRegex!.Match(path.ToString());
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if (!match.Success)
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{
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return entity;
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}
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// Create an Instant from this.
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Instant instant = this.clock.CreateInstant(
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Convert.ToInt32(match.Groups["year"].Value),
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Convert.ToInt32(match.Groups["month"].Value),
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Convert.ToInt32(match.Groups["day"].Value));
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return entity.Set(instant);
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}
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}
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}
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