new Function<@Nullable String, @Nullable Character>() {
        @Override
        public @Nullable Character apply(@Nullable String input) {
          return input == null ? null : input.charAt(0);
        }
      };

  abstract static class ColumnMapTests extends MapMapTests {
    ColumnMapTests(
        boolean allowsNullValues,
        boolean supportsRemove,
        boolean supportsClear,

     */
    private String createTestString(int length) {
        StringBuilder sb = new StringBuilder(length);
        for (int i = 0; i < length; i++) {
            sb.append((char) ('A' + (i % 26)));
        }
        return sb.toString();
    }

    /**
     * Helper method to create a mock Type 2 message with target information for NTLMv2
     */

        Integer.class,
        long.class,
        Long.class,
        short.class,
        Short.class,
        byte.class,
        Byte.class,
        boolean.class,
        Boolean.class,
        char.class,
        Character.class,
        int[].class,
        Object[].class,
        UnsignedInteger.class,
        UnsignedLong.class,
        BigInteger.class,
        BigDecimal.class,

            int rn) throws CIFSException {
        if (log.isDebugEnabled()) {
            log.debug("Resolving DFS path " + path);
        }

        if (path.length() >= 2 && path.charAt(0) == '\\' && path.charAt(1) == '\\') {
            throw new SmbException("Path must not start with double slash: " + path);
        }

        try (SmbSessionImpl sess = getSmbSession(ctx, targetHost, targetDomain);

        // Prepare test data with long filename (255 characters)
        StringBuilder longName = new StringBuilder();
        for (int i = 0; i < 255; i++) {
            longName.append((char) ('a' + (i % 26)));
        }
        String expectedFilename = longName.toString();
        byte[] buffer = createValidBuffer(expectedFilename, "LONGNA~1.TXT", true);

        // Decode

        }
        if (url.startsWith("file:")) {
            final String value = decodeUrlAsName(url.substring(5), true);
            if (value.length() > 2 && value.charAt(2) == ':') {
                // Windows
                return abbreviateSite(value.substring(1).replace('/', '\\'));
            }
            // Unix
            return abbreviateSite(value);
        }

        String result2 = crawlingInfoHelper.generateId(input2);
        assertNotNull(result2);
        assertEquals(128, result2.length());

        String input3 = "http://example.com/path<with>special|chars";
        String result3 = crawlingInfoHelper.generateId(input3);
        assertNotNull(result3);
        assertEquals(128, result3.length());

        // Test that different inputs produce different results

          params[i] = ArbitraryInstances.get(sig.get(i));
        }
      }
    }
    return params;
  }

  private static final ImmutableList<Class<?>> POSSIBLE_PARAM_TYPES =
      ImmutableList.of(char.class, int.class, long.class, Object.class);

  /**
   * Returns a list of parameters for invoking an overload of checkState, checkArgument or
   * checkNotNull
   *

          params[i] = ArbitraryInstances.get(sig.get(i));
        }
      }
    }
    return params;
  }

  private static final ImmutableList<Class<?>> POSSIBLE_PARAM_TYPES =
      ImmutableList.of(char.class, int.class, long.class, Object.class);

  /**
   * Returns a list of parameters for invoking an overload of checkState, checkArgument or
   * checkNotNull
   *

    @Override
    boolean isPartialView() {
      return false;
    }

    @Override
    public Character get(int index) {
      checkElementIndex(index, size()); // for GWT
      return string.charAt(index);
    }

    @Override
    public int size() {
      return string.length();
    }

    // redeclare to help optimizers with b/310253115
    @SuppressWarnings("RedundantOverride")