private void CreateDirectory(string path)
{
FolderNode currentNode = null;
var parser = new PathParser(path);
parser.WithFirstFileSystemNodeNameDo(driveName => currentNode = (FolderNode) _rootNode.FindChildNodeNamed(driveName));
if (currentNode == null) throw new DirectoryNotFoundException(string.Format("Can't create the directory '{0}' since the drive does not exist.", path));
parser.WithEachButFirstFileSystemNodeNameDo(folderName => currentNode = currentNode.CreateOrReuseFolderNode(folderName));
}