/**
     * Validates the provided string against this structure's metadata.
     * Checks that the string length matches the expected length and that
     * null strings have a zero pointer.
     *
     * @param string the string to validate
     * @return the validated string
     * @throws PACDecodingException if validation fails
     */
    public String check(final String string) throws PACDecodingException {

    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();

   * RuntimeException runtime exceptions} thrown by the executor.
   */
  @SuppressWarnings("CatchingUnchecked") // sneaky checked exception
  private static void executeListener(Runnable runnable, Executor executor) {
    try {
      executor.execute(runnable);
    } catch (Exception e) { // sneaky checked exception
      // Log it and keep going -- bad runnable and/or executor. Don't punish the other runnables if

     * 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

    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);

    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;

                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) {

For the error, we use the exception `HTTPException`:

{* ../../docs_src/security/tutorial003_an_py310.py hl[3,79:81] *}

### Check the password { #check-the-password }

At this point we have the user data from our database, but we haven't checked the password.

Let's put that data in the Pydantic `UserInDB` model first.

                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();
    }

            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);

    /**