osu/osu.Game/Skinning/LegacySkin.cs

// 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;
using System.IO;
using System.Linq;
using osu.Framework.Audio;
using osu.Framework.Audio.Sample;
using osu.Framework.Graphics;
using osu.Framework.Graphics.Sprites;
using osu.Framework.Graphics.Textures;
using osu.Framework.IO.Stores;

namespace osu.Game.Skinning
{
    public class LegacySkin : Skin
    {
        private readonly TextureStore textures;

        private readonly SampleManager samples;

        public LegacySkin(SkinInfo skin, IResourceStore<byte[]> storage, AudioManager audioManager)
            : base(skin)
        {
            storage = new LegacySkinResourceStore(skin, storage);
            samples = audioManager.GetSampleManager(storage);
            textures = new TextureStore(new RawTextureLoaderStore(storage));
        }

        public override Drawable GetDrawableComponent(string componentName)
        {
            switch (componentName)
            {
                case "Play/Miss":
                    componentName = "hit0";
                    break;
                case "Play/Meh":
                    componentName = "hit50";
                    break;
                case "Play/Good":
                    componentName = "hit100";
                    break;
                case "Play/Great":
                    componentName = "hit300";
                    break;
            }

            var texture = textures.Get(componentName);
            if (texture == null) return null;

            return new Sprite { Texture = texture };
        }

        public override SampleChannel GetSample(string sampleName) => samples.Get(sampleName);

        private class LegacySkinResourceStore : IResourceStore<byte[]>
        {
            private readonly SkinInfo skin;
            private readonly IResourceStore<byte[]> underlyingStore;

            private string getPathForFile(string filename)
            {
                string lastPiece = filename.Split('/').Last();

                var file = skin.Files.FirstOrDefault(f =>
                    string.Equals(Path.GetFileNameWithoutExtension(f.Filename), lastPiece, StringComparison.InvariantCultureIgnoreCase));
                return file?.FileInfo.StoragePath;
            }

            public LegacySkinResourceStore(SkinInfo skin, IResourceStore<byte[]> underlyingStore)
            {
                this.skin = skin;
                this.underlyingStore = underlyingStore;
            }

            public Stream GetStream(string name) => underlyingStore.GetStream(getPathForFile(name));

            byte[] IResourceStore<byte[]>.Get(string name) => underlyingStore.Get(getPathForFile(name));
        }
    }
}