/**
   * Delete a Role form User.
   *
   * @param username
   * @param role
   */
  public void deleteRole(String username, String role) {
    String[] infos = null;
    StringBuffer userInfoBuffer = new StringBuffer();

    String userInfos = (String) users.get(username);

    // If user already exists, remove the role
    if (userInfos != null && userInfos.length() > 0) {
      infos = userInfos.split(",");
      String password = infos[0];
      userInfoBuffer.append(password);

      for (int i = 1; i < infos.length; i++) {
        if (infos[i] != null && !infos[i].equals(role)) {
          userInfoBuffer.append(",");
          userInfoBuffer.append(infos[i]);
        }
      }
      String newUserInfo = userInfoBuffer.toString();
      users.put(username, newUserInfo);
    }

    try {
      users.save();
    } catch (Exception ex) {
      LOGGER.error("Cannot update users file,", ex);
    }
  }
  /**
   * Add a user.
   *
   * @param username
   * @param password
   */
  public void addUser(String username, String password) {
    String[] infos = null;
    StringBuffer userInfoBuffer = new StringBuffer();

    String newPassword = password;

    // If encryption support is enabled, encrypt password
    if (encryptionSupport != null && encryptionSupport.getEncryption() != null) {
      newPassword = encryptionSupport.getEncryption().encryptPassword(password);
      if (encryptionSupport.getEncryptionPrefix() != null) {
        newPassword = encryptionSupport.getEncryptionPrefix() + newPassword;
      }
      if (encryptionSupport.getEncryptionSuffix() != null) {
        newPassword = newPassword + encryptionSupport.getEncryptionSuffix();
      }
    }

    String userInfos = (String) users.get(username);

    // If user already exists, update password
    if (userInfos != null && userInfos.length() > 0) {
      infos = userInfos.split(",");
      userInfoBuffer.append(newPassword);

      for (int i = 1; i < infos.length; i++) {
        userInfoBuffer.append(",");
        userInfoBuffer.append(infos[i]);
      }
      String newUserInfo = userInfoBuffer.toString();
      users.put(username, newUserInfo);
    } else {
      users.put(username, newPassword);
    }

    try {
      users.save();
    } catch (Exception ex) {
      LOGGER.error("Cannot update users file,", ex);
    }
  }