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osu-lazer/osu.Game/Collections/BeatmapCollection.cs

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// 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.Generic;
using JetBrains.Annotations;
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using osu.Game.Beatmaps;
using osu.Game.Database;
using Realms;
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namespace osu.Game.Collections
{
/// <summary>
/// A collection of beatmaps grouped by a name.
/// </summary>
public class BeatmapCollection : RealmObject, IHasGuidPrimaryKey
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{
[PrimaryKey]
public Guid ID { get; set; }
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/// <summary>
/// The collection's name.
/// </summary>
public string Name { get; set; } = string.Empty;
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/// <summary>
/// The <see cref="BeatmapInfo.MD5Hash"/>es of beatmaps contained by the collection.
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/// </summary>
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/// <remarks>
/// We store as hashes rather than references to <see cref="BeatmapInfo"/>s to allow collections to maintain
/// references to beatmaps even if they are removed. This helps with cases like importing collections before
/// importing the beatmaps they contain, or when sharing collections between users.
///
/// This can probably change in the future as we build the system up.
/// </remarks>
public IList<string> BeatmapMD5Hashes { get; } = null!;
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/// <summary>
/// The date when this collection was last modified.
/// </summary>
public DateTimeOffset LastModified { get; set; }
public BeatmapCollection(string? name = null, IList<string>? beatmapMD5Hashes = null)
{
ID = Guid.NewGuid();
Name = name ?? string.Empty;
BeatmapMD5Hashes = beatmapMD5Hashes ?? new List<string>();
LastModified = DateTimeOffset.UtcNow;
}
[UsedImplicitly]
private BeatmapCollection()
{
}
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}
}