code: public FilterCellFastStr findNextCell(int hashcode) {
          if (nextCell == null) {
              return null;
          }
  
          return (FilterCellFastStr) nextCell.get(hashcode);
      }
docs: Find the next cell, for a given string hashcode, which may come after this
  cell
  in the address tree.
  
  @param hashcode
  The next string hashcodein the URL Address that is to be tested
  for inclusion in the address tree
  @return null if the hashcode does not have another cell connected to this
  cell in the tree. Otherwise return the next cell in the tree that
  is represented
  by the hashcode.