ResolvingIOManager.cs

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using System;
using System.IO;

namespace Tgstation.Server.Host.IO
{
    sealed class ResolvingIOManager : DefaultIOManager
    {
        readonly string subdirectory;

        public ResolvingIOManager(IIOManager parent, string subdirectory)
        {
            if (parent == null)
                throw new ArgumentNullException(nameof(parent));
            if (subdirectory == null)
                throw new ArgumentNullException(nameof(subdirectory));

            this.subdirectory = ConcatPath(parent.ResolvePath(), subdirectory);
        }

        public override string ResolvePath(string path)
        {
            if (!Path.IsPathRooted(path))
                return base.ResolvePath(ConcatPath(subdirectory, path));
            return path;
        }
    }
}