chains().of(stream -> stream.forEach(c -> c.update(user)));
    }

    public boolean changePassword(final String username, final String password) {
        return chains().get(stream -> stream.allMatch(c -> c.changePassword(username, password)));
    }

    public void delete(final User user) {
        chains().of(stream -> stream.forEach(c -> c.delete(user)));
    }

    public User load(final User user) {

    }

    protected boolean isEmptyArray(final String[] values) {
        if (values == null || values.length == 0) {
            return true;
        }
        return stream(values).get(stream -> stream.allMatch(StringUtil::isBlank));
    }

    protected static String[] simplifyArray(final String[] values) {
        return stream(values).get(stream -> stream.filter(StringUtil::isNotBlank).distinct().toArray(n -> new String[n]));

                    }
                }
                if (logger.isDebugEnabled()) {
                    logger.debug("generator path: {}", s);
                }
                return s;
            }).allMatch(s -> {
                final boolean found = new File(s).isFile();
                if (found && logger.isDebugEnabled()) {
                    logger.debug("{} is found.", s);
                }

  /**
   * Returns {@code true} if every element in {@code iterable} satisfies the predicate. If {@code
   * iterable} is empty, {@code true} is returned.
   *
   * <p><b>{@code Stream} equivalent:</b> {@link Stream#allMatch}.
   */
  public static <T extends @Nullable Object> boolean all(
      Iterable<T> iterable, Predicate<? super T> predicate) {
    return Iterators.all(iterable.iterator(), predicate);
  }

  /**

            propMap.put(SUGGEST_SEARCH_LOG_PERMISSIONS, validPermissionList);
        }
        final List<String> list = validPermissionList;
        return stream(permissions).get(stream -> stream.allMatch(v -> list.contains(v)));
    }

    String getRoleSearchUserPrefix();

    String getRoleSearchGuestPermissions();

    default List<String> getSearchGuestPermissionList() {