if (values == null) {
            return "[]";
        }
        return "[" + Arrays.stream(values).map(this::convertJsonString).collect(Collectors.joining(",")) + "]";
    }

    /**
     * Converts the suggest item to a JSON string.
     * @return The JSON string representation of the suggest item.
     */
    public String toJsonString() {
        final StringBuilder buf = new StringBuilder(100);

        return childUrlRuleMap.entrySet().stream().map(e -> new Pair<>(e.getKey(), e.getValue()));
    }

    /**
     * Converts child URLs using the URL convert helper.
     *
     * @param requestDataList the list of request data to convert
     * @return the converted list of request data
     */

            throw new CrawlingAccessException("Could not process " + robotTxtUrl + ". ", e);
        } finally {
            EntityUtils.consumeQuietly(httpEntity);
        }
    }

    /**
     * Converts a robots.txt pattern to a regular expression.
     *
     * @param path The robots.txt pattern to convert
     * @return The equivalent regular expression
     */