}
            return userCode;
        }).orElse(null);
    }

    /**
     * Extracts the user code from the user bean stored in the session.
     * This method retrieves the authenticated user information and creates an encrypted user code.
     *
     * @param request the HTTP servlet request
     * @return the user code from the user bean, or null if not found or invalid
     */

    map.put("One", 1);
    map.put("Three", 3);
    map.put("Null", null);
    Function<String, @Nullable Integer> function = Functions.forMap(map);

    assertEquals(1, function.apply("One").intValue());
    assertEquals(3, function.apply("Three").intValue());
    assertThat(function.apply("Null")).isNull();

    assertThrows(IllegalArgumentException.class, () -> function.apply("Two"));

    if (initialCapacity != null) {
      builder.initialCapacity(initialCapacity);
    }
    if (maximumSize != null) {
      builder.maximumSize(maximumSize);
    }
    if (maximumWeight != null) {
      builder.maximumWeight(maximumWeight);
    }
    if (concurrencyLevel != null) {
      builder.concurrencyLevel(concurrencyLevel);
    }

    if (initialCapacity != null) {
      builder.initialCapacity(initialCapacity);
    }
    if (maximumSize != null) {
      builder.maximumSize(maximumSize);
    }
    if (maximumWeight != null) {
      builder.maximumWeight(maximumWeight);
    }
    if (concurrencyLevel != null) {
      builder.concurrencyLevel(concurrencyLevel);
    }

        final byte[] result = Base64Util.decode("");
        assertNull("Empty string should return null", result);
    }

    /**
     * Test decode with null
     *
     * @throws Exception
     */
    public void testDecode_Null() throws Exception {
        final byte[] result = Base64Util.decode(null);
        assertNull("Null should return null", result);
    }

    /**
     * Test encode/decode round trip with various data

   * elements are in the first {@code k} positions of {@code contents}, and {@code contents[i] ==
   * null} for {@code k <= i < n}.
   *
   * <p>This method takes ownership of {@code contents}; do not modify {@code contents} after this
   * returns.
   *
   * @throws NullPointerException if any of the first {@code n} elements of {@code contents} is null
   */
  static <E> ImmutableSortedSet<E> construct(

    return rowKey != null && safeContainsKey(backingMap, rowKey);
  }

  @Override
  public boolean containsValue(@Nullable Object value) {
    return value != null && super.containsValue(value);
  }

  @Override
  public @Nullable V get(@Nullable Object rowKey, @Nullable Object columnKey) {
    return (rowKey == null || columnKey == null) ? null : super.get(rowKey, columnKey);
  }

        if (text == null) {
            return null;
        }
        String tmp = text;
        for (final Normalizer normalizer : normalizers) {
            tmp = normalizer.normalize(tmp, field, langs);
            if (tmp == null) {
                return null;
            }
        }
        return tmp;
    }

    /**

     *
     * @param rootDir the root directory (must not be {@literal null})
     * @param handler the handler to process classes (must not be {@literal null})
     */
    public static void forEach(final File rootDir, final ClassHandler handler) {
        assertArgumentNotNull("rootDir", rootDir);
        assertArgumentNotNull("handler", handler);

        forEach(rootDir, null, handler);
    }

    /**

        int level;
        FileInputStream in = null;

        log = LogStream.getInstance();

        try {
            filename = System.getProperty("jcifs_smb1.properties");
            if (filename != null && filename.length() > 1) {
                in = new FileInputStream(filename);
            }
            Config.load(in);
            if (in != null) {
                in.close();
            }