code: public FilterCellFastStr findNextCellWithLength(int hashcode, int length) {
          if (nextCell == null) {
              return null;
          }
  
          FilterCellFastStr x = (FilterCellFastStr) nextCell.get(hashcode);
  
          if (x != null) {
              if (x.getHashLength() != length) {
                  return null;
              }
          }
  
          return x;
      }
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
  @param length
  the length of the string. If the hashcode and length match an
  entry
  for the next cell, then a match has been found.
  @return null if the the hashcode and length do not have describe another
  cell
  connected to this cell in the tree.
  Otherwise return the next cell in the tree that is represented
  by the hashcode.