code: boolean contains(String normalizedPath) {
          if (normalizedPath == null)
              return false;
  
          if (normalizedPath.length() < normalizedRoot.length())
              return false;
  
          return normalizedPath.regionMatches(0, normalizedRoot, 0, normalizedRoot.length());
      }
docs: Check if the provided path is contained within this root's hierarchy.
  
  @param normalizedPath
  normalized path for a potential descendant ('..' and '.' segments
  removed)
  @return
  true if this root contains the resource indicated by the
  normalized path, false otherwise (or if the path is null).