private FileNode CreateFile(string path, Func<FolderNode, string, FileNode> createStrategy)
{
FileNode resultNode = null;
var currentNode = _rootNode;
var parser = new PathParser(path);
parser.WithEachButLastFileSystemNodeNameDo(folderName => currentNode = currentNode.CreateOrReuseFolderNode(folderName));
parser.WithLastFileSystemNodeNameDo(filename => resultNode = createStrategy(currentNode, filename));
return resultNode;
}