osu-lazer/osu.Game/Skinning/LegacySkinResourceStore.cs

// 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 System.Linq;
using osu.Framework.IO.Stores;
using osu.Game.Database;

namespace osu.Game.Skinning
{
    public class LegacySkinResourceStore<T> : ResourceStore<byte[]>
        where T : INamedFileInfo
    {
        private readonly IHasFiles<T> source;

        public LegacySkinResourceStore(IHasFiles<T> source, IResourceStore<byte[]> underlyingStore)
            : base(underlyingStore)
        {
            this.source = source;
        }

        protected override IEnumerable<string> GetFilenames(string name)
        {
            if (source.Files == null)
                yield break;

            foreach (var filename in base.GetFilenames(name))
            {
                var path = getPathForFile(filename);
                if (path != null)
                    yield return path;
            }
        }

        private string getPathForFile(string filename) =>
            source.Files.Find(f => string.Equals(f.Filename, filename, StringComparison.OrdinalIgnoreCase))?.FileInfo.StoragePath;

        public override IEnumerable<string> GetAvailableResources() => source.Files.Select(f => f.Filename);
    }
}