53 lines
1.5 KiB
C#
53 lines
1.5 KiB
C#
using System.Collections.Generic;
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using System.Linq;
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using FluentValidation;
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using Gallium;
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namespace Nitride.Entities;
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/// <summary>
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/// Links a series of entities together in some manner. This assumes that
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/// the entities coming into the operation are already ordered.
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/// </summary>
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[WithProperties]
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public partial class LinkSerialEntities : OperationBase
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{
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private readonly IValidator<LinkSerialEntities> validator;
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public LinkSerialEntities(IValidator<LinkSerialEntities> validator)
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{
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this.validator = validator;
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}
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/// <summary>
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/// The callback function that sets the previous and next
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/// </summary>
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public LinkPreviousNextHandler? UpdatePreviousNext { 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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// Make sure everything is good.
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this.validator.ValidateAndThrow(this);
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// We pull all the entities into a list so we can walk through them
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// more than once along with index access.
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var list = input.ToList();
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// Go through the list and assign each entity in order.
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for (int i = 0; i < list.Count; i++)
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{
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Entity entity = list[i];
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Entity? previous = i > 0 ? list[i - 1] : null;
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Entity? next = i < list.Count - 1 ? list[i + 1] : null;
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list[i] = this.UpdatePreviousNext!(entity, previous, next);
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}
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// Return the resulting list.
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return list;
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}
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}
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