/**
   * Updates the signer order in a package.
   *
   * @param documentPackage The id of the package to update signer order
   */
  public void orderSigners(DocumentPackage documentPackage) {
    String path =
        template
            .urlFor(UrlTemplate.ROLE_PATH)
            .replace("{packageId}", documentPackage.getId().getId())
            .build();

    List<Role> roles = new ArrayList<Role>();
    for (com.silanis.esl.sdk.Signer signer : documentPackage.getSigners()) {
      roles.add(new SignerConverter(signer).toAPIRole(signer.getId()));
    }

    try {
      String json = Serialization.toJson(roles);
      client.put(path, json);
    } catch (RequestException e) {
      throw new EslServerException("Could not order signers.", e);
    } catch (Exception e) {
      throw new EslException("Could not order signers." + " Exception: " + e.getMessage());
    }
  }