private IEnumerable <string> GetRoots(string pattern)
{
if (string.IsNullOrEmpty(pattern))
{
return(Enumerable.Empty <string>());
}
if (!_searchTree.IsPathRooted(pattern))
{
return(_searchTree.GetTreeRoots());
}
var root = _searchTree.GetPathRoot(pattern);
var p = pattern.Substring(root.Length);
var path = GetLongestPath(p, root);
return(new[] { path });
}
