assertEquals(value, documentHelper.encodeSimilarDocHash(hash));
        hash = "$H4sIAAAAAAAAAAMAAAAAAAAAAAA";
        value = "$H4sIAAAAAAAAAAMAAAAAAAAAAAA";
        assertEquals(value, documentHelper.encodeSimilarDocHash(hash));

        assertNull(documentHelper.encodeSimilarDocHash(null));
    }

    public void test_decodeSimilarDocHash() {
        DocumentHelper documentHelper = new DocumentHelper();

    }

    public static String sdh(final String input) {
        if (StringUtil.isBlank(input)) {
            return input;
        }
        return ComponentUtil.getDocumentHelper().encodeSimilarDocHash(input);
    }

    public static String join(final Object input) {
        String[] values = null;
        if (input instanceof String[]) {
            values = (String[]) input;

                    logger.debug("Failed to decode {}", hash, e);
                }
            }
        }
        return hash;
    }

    public String encodeSimilarDocHash(final String hash) {
        if (hash != null && !hash.startsWith(SIMILAR_DOC_HASH_PREFIX)) {
            try (ByteArrayOutputStream baos = new ByteArrayOutputStream()) {