code: @Override
      public void closeAllEquivalences() throws ResourceDownloadError,
              IndexingFailure, IOException {
          final Iterator<JDBMEquivalenceLookup> equivalenceIndexIt =
                  openEquivalences.values().iterator();
  
          while (equivalenceIndexIt.hasNext()) {
              final JDBMEquivalenceLookup jdbmLookup = equivalenceIndexIt.next();
  
              // close the JDBM lookup
              jdbmLookup.close();
  
              // remove from open equivalences map
              equivalenceIndexIt.remove();
          }
      }
docs: {@inheritDoc}