}

    /**
     * Gets the pattern for matching invalid URLs.
     *
     * @return the invalid URL pattern
     */
    public Pattern getInvalidUrlPattern() {
        return invalidUrlPattern;
    }

    /**
     * Sets the pattern for matching invalid URLs.
     *
     * @param invalidUrlPattern the invalid URL pattern to set
     */

    /**
     * Retrieves an integer value from system properties with a default fallback.
     *
     * @param key the property key to look up
     * @param defaultValue the default value if the property is not found or invalid
     * @return the integer value or default value
     */
    protected Integer getDefaultInteger(final String key, final Integer defaultValue) {
        final String value = systemProperties.getProperty(key);

                .orElseThrow(() -> new SsoMessageException(
                        messages -> messages.addErrorsFailedToProcessSsoRequest(UserMessages.GLOBAL_PROPERTY_KEY, "Invalid state."),
                        "Failed to process metadata.", new SsoProcessException("Invalid state.")));
    }

    /**
     * Gets the logout response.
     * @return The logout response.
     */
    protected ActionResponse getLogoutResponse() {

            final Path filePath = Paths.get(path).normalize();
            final String normalizedPath = filePath.toString();
            if (normalizedPath.contains("..")) {
                throw new IllegalArgumentException("Invalid file path");
            }
            final File file = filePath.toFile();
            final String canonicalPath = file.getCanonicalPath();
            final String varPath = System.getProperty("fess.var.path");

                .map(String::trim)
                .filter(s -> !requiredValidator.isValid(source.get(s), null))
                .collect(Collectors.toList()));
    }

    default boolean isNonEmptyValue(final Object value) {
        final RequiredValidator requiredValidator = new RequiredValidator();
        return requiredValidator.isValid(value, null);
    }

    String getCrawlerDocumentSpaceChars();

                throw new ThumbnailGenerationException("Invalid thumbnail: " + url);
            }
            final String configId = DocumentUtil.getValue(doc, fessConfig.getIndexFieldConfigId(), String.class);
            if (configId == null || configId.length() < 2) {
                throw new ThumbnailGenerationException("Invalid configId: " + configId);
            }
            return consumer.test(configId, url);

     * @param attributes the attributes attached to the element
     * @throws SAXException if a SAX error occurs or if the XML format is invalid
     */
    @Override
    public void startElement(final String uri, final String localName, final String qName, final Attributes attributes)
            throws SAXException {
        if (logger.isDebugEnabled()) {

            if (isValidRedirectUrl(targetUrl)) {
                return HtmlResponse.fromRedirectPathAsIs(DocumentUtil.encodeUrl(targetUrl + hash));
            } else {
                logger.warn("Invalid redirect URL detected: {}", targetUrl);
                saveError(messages -> messages.addErrorsDocumentNotFound(GLOBAL, form.docId));
                return redirect(ErrorAction.class);
            }
        }

            if (values.length > 2) {
                throw new InvalidQueryException(messages -> messages.addErrorsInvalidQuerySortValue(UserMessages.GLOBAL_PROPERTY_KEY, text),
                        "Invalid sort field: " + termQuery);
            }
            final String sortField = values[0];
            if (!getQueryFieldConfig().isSortField(sortField)) {
                throw new InvalidQueryException(

        Type2Message type2Message;
        try {
            type2Message = new Type2Message(Base64.getDecoder().decode(challenge));
        } catch (final IOException exception) {
            throw new NTLMEngineException("Invalid NTLM type 2 message", exception);
        }
        final int type2Flags = type2Message.getFlags();