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osu-lazer/osu.Game/Beatmaps/BeatmapStore.cs

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// Copyright (c) 2007-2018 ppy Pty Ltd <contact@ppy.sh>.
// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
using System;
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using System.Linq;
using Microsoft.EntityFrameworkCore;
using osu.Game.Database;
namespace osu.Game.Beatmaps
{
/// <summary>
/// Handles the storage and retrieval of Beatmaps/BeatmapSets to the database backing
/// </summary>
public class BeatmapStore : DatabaseBackedStore
{
public event Action<BeatmapSetInfo> BeatmapSetAdded;
public event Action<BeatmapSetInfo> BeatmapSetRemoved;
public event Action<BeatmapInfo> BeatmapHidden;
public event Action<BeatmapInfo> BeatmapRestored;
public BeatmapStore(Func<OsuDbContext> factory)
: base(factory)
{
}
/// <summary>
/// Add a <see cref="BeatmapSetInfo"/> to the database.
/// </summary>
/// <param name="beatmapSet">The beatmap to add.</param>
public void Add(BeatmapSetInfo beatmapSet)
{
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var context = GetContext();
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foreach (var beatmap in beatmapSet.Beatmaps.Where(b => b.Metadata != null))
{
// If we detect a new metadata object it'll be attached to the current context so it can be reused
// to prevent duplicate entries when persisting. To accomplish this we look in the cache (.Local)
// of the corresponding table (.Set<BeatmapMetadata>()) for matching entries to our criteria.
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var contextMetadata = context.Set<BeatmapMetadata>().Local.SingleOrDefault(e => e.Equals(beatmap.Metadata));
if (contextMetadata != null)
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beatmap.Metadata = contextMetadata;
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else
context.BeatmapMetadata.Attach(beatmap.Metadata);
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}
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context.BeatmapSetInfo.Attach(beatmapSet);
context.SaveChanges();
BeatmapSetAdded?.Invoke(beatmapSet);
}
/// <summary>
/// Delete a <see cref="BeatmapSetInfo"/> from the database.
/// </summary>
/// <param name="beatmapSet">The beatmap to delete.</param>
/// <returns>Whether the beatmap's <see cref="BeatmapSetInfo.DeletePending"/> was changed.</returns>
public bool Delete(BeatmapSetInfo beatmapSet)
{
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var context = GetContext();
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Refresh(ref beatmapSet, BeatmapSets);
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if (beatmapSet.DeletePending) return false;
beatmapSet.DeletePending = true;
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context.SaveChanges();
BeatmapSetRemoved?.Invoke(beatmapSet);
return true;
}
/// <summary>
/// Restore a previously deleted <see cref="BeatmapSetInfo"/>.
/// </summary>
/// <param name="beatmapSet">The beatmap to restore.</param>
/// <returns>Whether the beatmap's <see cref="BeatmapSetInfo.DeletePending"/> was changed.</returns>
public bool Undelete(BeatmapSetInfo beatmapSet)
{
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var context = GetContext();
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Refresh(ref beatmapSet, BeatmapSets);
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if (!beatmapSet.DeletePending) return false;
beatmapSet.DeletePending = false;
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context.SaveChanges();
BeatmapSetAdded?.Invoke(beatmapSet);
return true;
}
/// <summary>
/// Hide a <see cref="BeatmapInfo"/> in the database.
/// </summary>
/// <param name="beatmap">The beatmap to hide.</param>
/// <returns>Whether the beatmap's <see cref="BeatmapInfo.Hidden"/> was changed.</returns>
public bool Hide(BeatmapInfo beatmap)
{
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var context = GetContext();
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Refresh(ref beatmap, Beatmaps);
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if (beatmap.Hidden) return false;
beatmap.Hidden = true;
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context.SaveChanges();
BeatmapHidden?.Invoke(beatmap);
return true;
}
/// <summary>
/// Restore a previously hidden <see cref="BeatmapInfo"/>.
/// </summary>
/// <param name="beatmap">The beatmap to restore.</param>
/// <returns>Whether the beatmap's <see cref="BeatmapInfo.Hidden"/> was changed.</returns>
public bool Restore(BeatmapInfo beatmap)
{
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var context = GetContext();
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Refresh(ref beatmap, Beatmaps);
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if (!beatmap.Hidden) return false;
beatmap.Hidden = false;
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context.SaveChanges();
BeatmapRestored?.Invoke(beatmap);
return true;
}
public override void Cleanup()
{
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var context = GetContext();
var purgeable = context.BeatmapSetInfo.Where(s => s.DeletePending && !s.Protected)
.Include(s => s.Beatmaps).ThenInclude(b => b.Metadata)
.Include(s => s.Beatmaps).ThenInclude(b => b.BaseDifficulty)
.Include(s => s.Metadata);
// metadata is M-N so we can't rely on cascades
context.BeatmapMetadata.RemoveRange(purgeable.Select(s => s.Metadata));
context.BeatmapMetadata.RemoveRange(purgeable.SelectMany(s => s.Beatmaps.Select(b => b.Metadata).Where(m => m != null)));
// todo: we can probably make cascades work here with a FK in BeatmapDifficulty. just make to make it work correctly.
context.BeatmapDifficulty.RemoveRange(purgeable.SelectMany(s => s.Beatmaps.Select(b => b.BaseDifficulty)));
// cascades down to beatmaps.
context.BeatmapSetInfo.RemoveRange(purgeable);
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context.SaveChanges();
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}
public IQueryable<BeatmapSetInfo> BeatmapSets => GetContext().BeatmapSetInfo
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.Include(s => s.Metadata)
.Include(s => s.Beatmaps).ThenInclude(s => s.Ruleset)
.Include(s => s.Beatmaps).ThenInclude(b => b.BaseDifficulty)
.Include(s => s.Beatmaps).ThenInclude(b => b.Metadata)
.Include(s => s.Files).ThenInclude(f => f.FileInfo);
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public IQueryable<BeatmapInfo> Beatmaps => GetContext().BeatmapInfo
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.Include(b => b.BeatmapSet).ThenInclude(s => s.Metadata)
.Include(b => b.BeatmapSet).ThenInclude(s => s.Files).ThenInclude(f => f.FileInfo)
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.Include(b => b.Metadata)
.Include(b => b.Ruleset)
.Include(b => b.BaseDifficulty);
}
}