Split out nested classes

osu.Game/Skinning/LegacySkinResourceStore.cs

@@ -0,0 +1,76 @@
+// 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.IO;
+using System.Linq;
+using System.Threading.Tasks;
+using osu.Framework.IO.Stores;
+using osu.Game.Database;
+
+namespace osu.Game.Skinning
+{
+    public class LegacySkinResourceStore<T> : IResourceStore<byte[]>
+        where T : INamedFileInfo
+    {
+        private readonly IHasFiles<T> source;
+        private readonly IResourceStore<byte[]> underlyingStore;
+
+        private string getPathForFile(string filename)
+        {
+            bool hasExtension = filename.Contains('.');
+
+            var file = source.Files.Find(f =>
+                string.Equals(hasExtension ? f.Filename : Path.ChangeExtension(f.Filename, null), filename, StringComparison.InvariantCultureIgnoreCase));
+            return file?.FileInfo.StoragePath;
+        }
+
+        public LegacySkinResourceStore(IHasFiles<T> source, IResourceStore<byte[]> underlyingStore)
+        {
+            this.source = source;
+            this.underlyingStore = underlyingStore;
+        }
+
+        public Stream GetStream(string name)
+        {
+            string path = getPathForFile(name);
+            return path == null ? null : underlyingStore.GetStream(path);
+        }
+
+        public IEnumerable<string> GetAvailableResources() => source.Files.Select(f => f.Filename);
+
+        byte[] IResourceStore<byte[]>.Get(string name) => GetAsync(name).Result;
+
+        public Task<byte[]> GetAsync(string name)
+        {
+            string path = getPathForFile(name);
+            return path == null ? Task.FromResult<byte[]>(null) : underlyingStore.GetAsync(path);
+        }
+
+        #region IDisposable Support
+
+        private bool isDisposed;
+
+        protected virtual void Dispose(bool disposing)
+        {
+            if (!isDisposed)
+            {
+                isDisposed = true;
+            }
+        }
+
+        ~LegacySkinResourceStore()
+        {
+            Dispose(false);
+        }
+
+        public void Dispose()
+        {
+            Dispose(true);
+            GC.SuppressFinalize(this);
+        }
+
+        #endregion
+    }
+}