List<RequestData> urlList = new ArrayList<>();

        urlList = fessXpathTransformer.convertChildUrlList(urlList);
        assertEquals(0, urlList.size());

        urlList.clear();
        urlList.add(RequestDataBuilder.newRequestData().get().url("http://www.example.com").build());
        urlList = fessXpathTransformer.convertChildUrlList(urlList);
        assertEquals(1, urlList.size());

    }

    @Override
    public void addIncludeUrlFilter(final String sessionId, final List<String> urlList) {
        final Set<String> invalidateSet = new HashSet<>();
        final List<OpenSearchUrlFilter> urlFilterList = new ArrayList<>(urlList.size());
        for (final String url : urlList) {
            final OpenSearchUrlFilter esUrlFilter = new OpenSearchUrlFilter();
            esUrlFilter.setSessionId(sessionId);

            List<String> urlList = new ArrayList<>(docList.size());
            for (final Map<String, Object> doc : docList) {
                final String urlObj = DocumentUtil.getValue(doc, fessConfig.getIndexFieldUrl(), String.class);
                if (urlObj != null) {
                    urlList.add(urlObj);
                }
            }
            urlList = favoriteLogService.getUrlList(userCode, urlList);

            logger.warn("Could not parse anchor tags.", e);
        }

        final List<String> urlList = new ArrayList<>(anchorList.size());
        for (final RequestData requestData : anchorList) {
            urlList.add(requestData.getUrl());
        }
        return urlList;
    }

    protected URL getBaseUrl(final String currentUrl, final String baseHref) throws MalformedURLException {

                        addChildUrlFromTagAttribute(urlList, url, attrValue, encoding);
                    }
                }
            }
        } catch (final XPathException e) {
            logger.warn("Could not get urls: (" + xpath + ", " + attr + ")", e);
        }
        return urlList;
    }