return (u, m) -> {
            final Map<String, Object> paramMap = new HashMap<>();
            paramMap.put("url", u);
            paramMap.put("matcher", m);
            final Object value =
                    ComponentUtil.getScriptEngineFactory().getScriptEngine(Constants.DEFAULT_SCRIPT).evaluate(template, paramMap);
            if (value == null) {
                return u;
            }

            // proxy credentials
            if (paramMap.get(Param.Client.PROXY_USERNAME) != null && paramMap.get(Param.Client.PROXY_PASSWORD) != null) {
                paramMap.put(HcHttpClient.PROXY_CREDENTIALS_PROPERTY, new UsernamePasswordCredentials(
                        paramMap.remove(Param.Client.PROXY_USERNAME).toString(), paramMap.remove(Param.Client.PROXY_PASSWORD).toString()));
            }
        } else {

    /**
     * Stores a document in the search index with the specified parameters and data.
     *
     * @param paramMap the data store parameters containing configuration and metadata
     * @param dataMap the document data to be indexed as key-value pairs
     */
    void store(DataStoreParams paramMap, Map<String, Object> dataMap);

    /**
     * Returns the total number of documents processed by this callback.
     *

        final FessConfig fessConfig = ComponentUtil.getFessConfig();
        final String proxyHost = fessConfig.getHttpProxyHost();
        final String proxyPort = fessConfig.getHttpProxyPort();
        if (StringUtil.isNotBlank(proxyHost) && StringUtil.isNotBlank(proxyPort)) {
            paramMap.put(Param.Client.PROXY_HOST, proxyHost);
            paramMap.put(Param.Client.PROXY_PORT, proxyPort);

                    final String hostname = paramMap.get(CRAWLER_FILE_AUTH + "." + fileAuthName + ".host");
                    final String port = paramMap.get(CRAWLER_FILE_AUTH + "." + fileAuthName + ".port");
                    final String username = paramMap.get(CRAWLER_FILE_AUTH + "." + fileAuthName + ".username");
                    final String password = paramMap.get(CRAWLER_FILE_AUTH + "." + fileAuthName + ".password");

     *
     * @param paramMap the parameter map to process
     * @param queryKey the key for storing query string parameters
     * @param formKey the key for storing form input parameters
     */
    protected void buildInitParamMap(final Map<String, String> paramMap, final String queryKey, final String formKey) {
        if (!paramMap.isEmpty()) {

    public Object evaluate(final String template, final Map<String, Object> paramMap) {
        if (StringUtil.isBlank(template)) {
            if (logger.isDebugEnabled()) {
                logger.debug("Template is blank, returning null");
            }
            return null;
        }

        final Map<String, Object> safeParamMap = paramMap != null ? paramMap : Collections.emptyMap();

        //  Parameters
        final Map<String, Object> paramMap = new HashMap<>();
        factory.setInitParameterMap(paramMap);

        final Map<String, String> clientConfigMap = getConfigParameterMap(ConfigName.CLIENT);
        if (clientConfigMap != null) {
            paramMap.putAll(clientConfigMap);
        }

        // auth params

            Map<String, String[]> paramMap = new HashMap<>(parameters);
            for (Map.Entry<String, String> entry : singleParameters.entrySet()) {
                if (!paramMap.containsKey(entry.getKey())) {
                    paramMap.put(entry.getKey(), new String[] { entry.getValue() });
                }
            }
            return paramMap;
        }

        @Override

    }

    /**
     * Test that evaluate handles null paramMap safely
     */
    @Test
    public void test_evaluate_nullParamMap() {
        assertEquals("test", groovyEngine.evaluate("return 'test'", null));
        assertEquals(123, groovyEngine.evaluate("return 123", null));
    }

    /**
     * Test that evaluate handles empty paramMap
     */
    @Test
    public void test_evaluate_emptyParamMap() {