code: @Override
      public boolean contains(final ENTRY entry) throws CouldNotPerformException {
          if (entry == null) {
              throw new NotAvailableException("entry");
          }
          return contains(entry.getId());
      }
docs: {@inheritDoc}
  
  @param entry {@inheritDoc}
  
  @return {@inheritDoc}
  
  @throws CouldNotPerformException {@inheritDoc}