throw new FessSystemException("Failed to access log files.", e);
            }
        }
        return logFileItems;
    }

    /**
     * Checks if the given filename is a log file.
     *
     * @param name the filename to check
     * @return true if the filename ends with .log or .log.gz, false otherwise
     */
    public static boolean isLogFilename(final String name) {

    clearCache();
    backingMap.clear();
  }

  @Nullable V get(Object key) {
    checkNotNull(key);
    V value = getIfCached(key);
    // TODO(b/192579700): Use a ternary once it no longer confuses our nullness checker.
    if (value == null) {
      return getWithoutCaching(key);
    } else {
      return value;
    }
  }

  final @Nullable V getWithoutCaching(Object key) {
    checkNotNull(key);

    protected String encodePath(final String path) {
        return Base64.getUrlEncoder().encodeToString(path.getBytes(Constants.CHARSET_UTF_8));
    }

    /**
     * Checks if the given path matches this creator's pattern.
     *
     * @param path the file path to check
     * @return true if the path matches the pattern, false otherwise
     */
    protected boolean isTarget(final String path) {
        return pattern.matcher(path).find();

 *   <li>Handling cases where no URL is in the queue</li>
 *   <li>Handling cases where no response processor or rule is found</li>
 *   <li>Handling system errors</li>
 * </ul>
 *
 * <p>
 * Each logging method checks the log level before logging the message.
 * The log level can be configured in the Log4j2 configuration file.
 * </p>
 *
 */
public class LogHelperImpl implements LogHelper {

    /** Logger for this class. */

     */
    @Override
    public void saveSession(final String sessionId) {
        // TODO use cache
    }

    /**
     * Checks if a URL has been visited by looking in both the queue and access results.
     *
     * @param urlQueue The URL queue entry to check.
     * @return true if the URL has been visited, false otherwise.
     */
    @Override
    public boolean visited(final OpenSearchUrlQueue urlQueue) {

            throws CIFSException;

    /**
     * Checks if the specified compression algorithm is supported.
     *
     * @param algorithm the compression algorithm to check
     * @return true if the algorithm is supported
     */
    boolean isAlgorithmSupported(int algorithm);

    /**

    this.inputFuture = checkNotNull(inputFuture);
    this.function = checkNotNull(function);
  }

  @Override
  @SuppressWarnings({
    "CatchingUnchecked", // sneaky checked exception
    "nullness", // TODO(b/147136275): Remove once our checker understands & and |.
  })
  public final void run() {
    @RetainedLocalRef ListenableFuture<? extends I> localInputFuture = inputFuture;
    @RetainedLocalRef F localFunction = function;

     * perform runtime null checks on the input and output. (That would also make NullPointerTester
     * happy!) However, since we didn't do that for many years, we're not about to start now.
     * (Runtime checks could be particularly bad for users of LegacyConverter.)
     *
     * Luckily, our nullness checker is smart enough to realize that `convert` has @PolyNull-like

                return null;
            }
            return (int) longValue;
        } catch (NumberFormatException e) {
            // should never happen since checked isDigits(s) before
            return null;
        }
    }

    @Override
    public String toString() {
        return comparable.toString();
    }

            }).orElse(Locale.ENGLISH).getLanguage() + "\">";
        }
        return "</html>";
    }

    /**
     * Checks if a label with the specified key exists in the current request's label map.
     *
     * @param value the label key to check
     * @return true if the label exists, false otherwise
     */
    public static Boolean labelExists(final String value) {