39 lines
1.4 KiB
C#
39 lines
1.4 KiB
C#
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using System;
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using System.Collections.Generic;
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using System.Linq;
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namespace Gallium
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{
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public static class MergeEnumerableEntityExtensions
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{
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/// <summary>
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/// Merges two sets of entities using the identifier to determine which
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/// entities are the same. The `merge` function takes both of the
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/// entities with the Entity from the `input` first and the one from
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/// `other` second. The returning entity is put into the collection. If
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/// an entity from the input is not found in other, then it is just
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/// passed on.
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/// </summary>
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/// <param name="input">The enumerable of entities to merge to.</param>
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/// <param name="other">The collection of entities to merge from.</param>
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/// <param name="merge">The callback to merge the two.</param>
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/// <returns>An sequence of entities, merged and unmerged.</returns>
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public static IEnumerable<Entity> MergeEntities(
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this IEnumerable<Entity> input,
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ICollection<Entity> other,
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Func<Entity, Entity, Entity> merge)
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{
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return input
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.Select(
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entity =>
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{
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Entity? found = other.FirstOrDefault(y => y == entity);
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return found == null
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? entity
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: merge(entity, found);
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});
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}
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}
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}
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