*/
    protected static String encodeId(final String objectName) {
        if (objectName == null) {
            return StringUtil.EMPTY;
        }
        return new String(Base64.getUrlEncoder().encode(objectName.getBytes(Constants.UTF_8_CHARSET)), Constants.UTF_8_CHARSET);
    }

    /**
     * Decodes a base64 encoded ID back to the original object name.
     *

     */
    public static String base64(final String value) {
        if (value == null) {
            return StringUtil.EMPTY;
        }
        return Base64.getUrlEncoder().encodeToString(value.getBytes(Constants.CHARSET_UTF_8));
    }

    /**
     * Checks if a file exists at the specified path within the servlet context.
     *

                            if (lowerEntryDn.indexOf(lowerGroupDn) != -1) {
                                groupList.add(Base64.getUrlEncoder().encodeToString(name.getBytes(Constants.CHARSET_UTF_8)));
                            } else if (lowerEntryDn.indexOf(lowerRoleDn) != -1) {
                                roleList.add(Base64.getUrlEncoder().encodeToString(name.getBytes(Constants.CHARSET_UTF_8)));
                            }
                        });

        }
        try {
            final String json = mapper.writeValueAsString(compactList);
            final byte[] compressed = gzipCompress(json.getBytes(StandardCharsets.UTF_8));
            return Base64.getUrlEncoder().withoutPadding().encodeToString(compressed);
        } catch (final Exception e) {
            throw new SearchQueryException("Failed to serialize a query: " + Arrays.toString(parameters), e);
        }
    }

     * @param url The URL.
     * @return The generated unique ID.
     */
    private String getId(final String sessionId, final String url) {
        final String id = sessionId + ID_SEPARATOR + new String(Base64.getUrlEncoder().withoutPadding().encode(url.getBytes(UTF_8)), UTF_8);
        if (id.length() <= idPrefixLength) {
            return id;
        }