return _instance;
    }

    // ===================================================================================
    //                                                                       Current DBDef
    //                                                                       =============
    @Override
    public String getProjectName() {
        return null;
    }

    @Override

        } catch (final SQLException e) {
            throw new SQLRuntimeException(e);
        }
    }

    /**
     * Deregisters all JDBC drivers associated with the current class loader.
     */
    public static synchronized void deregisterAllDrivers() {
        for (final Enumeration<Driver> e = DriverManager.getDrivers(); e.hasMoreElements();) {
            deregisterDriver(e.nextElement());

     * Constructs a seek response.
     *
     * @param config the configuration
     */
    public SmbComSeekResponse(final Configuration config) {
        super(config);
    }

    /**
     * Gets the current file offset after the seek operation.
     *
     * @return the offset
     */
    public long getOffset() {
        return this.offset;
    }

    /**
     * {@inheritDoc}
     *

        if (StringUtil.isNotBlank(form.logLevel)) {
            systemHelper.setLogLevel(form.logLevel);
        }
    }

    /**
     * Updates the form with current configuration values.
     *
     * @param fessConfig the current Fess configuration
     * @param form the form to populate with configuration values
     */
    public static void updateForm(final FessConfig fessConfig, final EditForm form) {

            }
        }

        return isValid;
    }

    /**
     * Gets the current preauth hash for a session.
     *
     * @param sessionId the session identifier
     * @return the current hash, or null if no context exists
     */
    public byte[] getCurrentPreauthHash(String sessionId) {

            throw new IllegalArgumentException("Session key not found: " + sessionId);
        }

        // Get current key
        byte[] currentKey = getRawKey(sessionId);
        if (currentKey == null) {
            throw new IllegalStateException("Unable to retrieve current key for rotation");
        }

        try {
            // Generate new key version

    /**
     * Stores child URLs from the given set into the crawling queue for future processing.
     * This method filters out blank URLs and increments the depth for child URLs.
     *
     * @param urlQueue the parent URL queue item
     * @param childUrlSet the set of child URLs to be queued for crawling
     */
    protected void storeChildUrlsToQueue(final UrlQueue<?> urlQueue, final Set<RequestData> childUrlSet) {

    public void close() throws IOException {
        try {
            fileInputStream.close();
        } finally {
            FileUtil.deleteInBackground(tempFile);
        }
    }

    /**
     * Marks the current position in this input stream. A subsequent call to the reset method repositions this stream at the last marked position so that subsequent reads re-read the same bytes.
     * This method delegates to {@link FileInputStream#mark(int)}.

                if (StringUtil.isNotEmpty(role)) {
                    roleSet.add(role);
                }
            }
        }
    }

    /**
     * Gets the current time in milliseconds.
     * @return The current time in milliseconds.
     */
    protected long getCurrentTime() {
        return ComponentUtil.getSystemHelper().getCurrentTimeAsLong();
    }

    /**

    /** The request attribute key for storing cached user agent type */
    protected static final String USER_AGENT_TYPE = "ViewHelper.UserAgent";

    /**
     * Determines the user agent type from the current HTTP request.
     * The method analyzes the User-Agent header to categorize the browser type
     * and caches the result in the request attribute for subsequent calls.
     *