code: @Override
      public long getContentSize() {
          try {
              if (hasDescriptionProperty(CONTENT_SIZE)) {
                  return getDescriptionProperty(CONTENT_SIZE).getLong();
              }
          } catch (final RepositoryException e) {
              LOGGER.warn("Could not get contentSize(): {}", e.getMessage());
          }
          return -1L;
      }
docs: /*
  (non-Javadoc)
  @see org.fcrepo.kernel.api.models.FedoraBinary#getContentSize()