52 lines
1.1 KiB
C#
52 lines
1.1 KiB
C#
using System;
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using System.Collections.Generic;
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namespace MoonTools.ECS
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{
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public struct FilterSignature
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{
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private const int HASH_FACTOR = 97;
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public readonly HashSet<Type> Included;
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public readonly HashSet<Type> Excluded;
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public FilterSignature(HashSet<Type> included, HashSet<Type> excluded)
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{
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Included = included;
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Excluded = excluded;
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}
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public override bool Equals(object? obj)
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{
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return obj is FilterSignature signature && Equals(signature);
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}
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public bool Equals(FilterSignature other)
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{
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return Included.SetEquals(other.Included) && Excluded.SetEquals(other.Excluded);
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}
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private int GuidToInt(Guid guid)
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{
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return BitConverter.ToInt32(guid.ToByteArray());
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}
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public override int GetHashCode()
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{
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int result = 1;
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foreach (var type in Included)
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{
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result *= HASH_FACTOR + GuidToInt(type.GUID);
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}
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// FIXME: Is there a way to avoid collisions when this is the same set as included?
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foreach (var type in Excluded)
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{
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result *= HASH_FACTOR + GuidToInt(type.GUID);
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}
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return result;
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}
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}
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}
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