mirror of
https://github.com/ppy/osu.git
synced 2024-12-25 02:42:54 +08:00
15d9147edd
The previous implementation of `SampleInfo`'s equality members was not completely correct in its treatment of the `sampleNames` array. While `Equals()` compared the values of `sampleNames` using `SequenceEqual()`, therefore performing a structural check that inspects the contents of both arrays, `GetHashCode()` used `HashCode.Combine()` directly on the arrays, therefore operating on reference equality. This could cause the pooling mechanism of samples to fail, as pointed out in #11079. To resolve, change the `GetHashCode()` implementation such that it also considers the contents of the array rather than just the reference to the array itself. This is achieved by leveraging `StructuralEqualityComparer`. Additionally, as a bonus, an array sort was added to the constructor of `SampleInfo`. This is intended to be a "canonicalisation" processing step for the array of sample names. Thanks to that sort, two instances of `SampleInfo` that have the same sample names but permutated will also turn out to be equal and have the same hash codes, given the implementation of both equality members. This gives `SampleInfo` set-like semantics.
42 lines
1.2 KiB
C#
42 lines
1.2 KiB
C#
// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
|
|
// See the LICENCE file in the repository root for full licence text.
|
|
|
|
using System;
|
|
using System.Collections;
|
|
using System.Collections.Generic;
|
|
using System.Linq;
|
|
|
|
namespace osu.Game.Audio
|
|
{
|
|
/// <summary>
|
|
/// Describes a gameplay sample.
|
|
/// </summary>
|
|
public class SampleInfo : ISampleInfo, IEquatable<SampleInfo>
|
|
{
|
|
private readonly string[] sampleNames;
|
|
|
|
public SampleInfo(params string[] sampleNames)
|
|
{
|
|
this.sampleNames = sampleNames;
|
|
Array.Sort(sampleNames);
|
|
}
|
|
|
|
public IEnumerable<string> LookupNames => sampleNames;
|
|
|
|
public int Volume { get; } = 100;
|
|
|
|
public override int GetHashCode()
|
|
{
|
|
return HashCode.Combine(
|
|
StructuralComparisons.StructuralEqualityComparer.GetHashCode(sampleNames),
|
|
Volume);
|
|
}
|
|
|
|
public bool Equals(SampleInfo other)
|
|
=> other != null && sampleNames.SequenceEqual(other.sampleNames);
|
|
|
|
public override bool Equals(object obj)
|
|
=> obj is SampleInfo other && Equals(other);
|
|
}
|
|
}
|