return ComponentUtil.getDocumentHelper().encodeSimilarDocHash(input);
    }

    /**
     * Joins array or list elements into a single space-separated string.
     *
     * @param input the input object (String[], List, or String)
     * @return joined string with elements separated by spaces, or empty string if invalid input
     */
    public static String join(final Object input) {
        String[] values = null;

    public void test_add_whitespaceInName() {
        TestScriptEngine engine = new TestScriptEngine();
        scriptEngineFactory.add("  test  ", engine);

        // Should be stored with lowercase and original spaces
        ScriptEngine retrieved = scriptEngineFactory.getScriptEngine("  test  ");
        assertNotNull(retrieved);
        assertEquals(engine, retrieved);
    }

        // Test with null groups
        user = new TestFessUser("testuser", new String[] {}, null, new String[] {});
        assertNull(user.getGroupNames());

        // Test with groups containing spaces
        groups = new String[] { "group one", "group two" };
        user = new TestFessUser("testuser", new String[] {}, groups, new String[] {});
        assertArrayEquals(groups, user.getGroupNames());
    }

            return "https://hooks.slack.com/services/test";
        }

        @Override
        public String getGoogleChatWebhookUrls() {
            return "https://chat.googleapis.com/v1/spaces/test/messages?key=test";
        }
    }

    private static class MockSMailPostingDiscloser implements SMailPostingDiscloser {
        private String subject;
        private String plainText;

        return fessConfig.isCrawlerDocumentDuplicateTermRemoved();
    }

    /**
     * Gets the array of space character codes from configuration.
     *
     * @return array of character codes to be treated as spaces
     */
    protected int[] getSpaceChars() {
        final FessConfig fessConfig = ComponentUtil.getFessConfig();

          override fun encode(
            writer: DerWriter,
            value: String,
          ) = writer.writeUtf8(value)
        },
    )

  /**
   * Permits alphanumerics, spaces, and these:
   *
   * ```
   *   ' () + , - . / : = ?
   * ```
   *
   * TODO(jwilson): constrain to printable string characters.
   */
  val PRINTABLE_STRING =
    BasicDerAdapter(

        String result1 = crawlingInfoHelper.generateId(input1);
        assertNotNull(result1);
        assertEquals(128, result1.length());

        String input2 = "http://example.com/path with spaces";
        String result2 = crawlingInfoHelper.generateId(input2);
        assertNotNull(result2);
        assertEquals(128, result2.length());

        String input3 = "http://example.com/path<with>special|chars";

  @AndroidIncompatible // Android forbids null parent ClassLoader
  // https://github.com/google/guava/issues/2152
  public void testJarFileWithSpaces() throws Exception {
    URL url = makeJarUrlWithName("To test unescaped spaces in jar file name.jar");
    URLClassLoader classloader = new URLClassLoader(new URL[] {url}, null);
    assertThat(ClassPath.from(classloader).getTopLevelClasses()).isNotEmpty();
  }

    }

    /**
     * Escapes special characters in a value string for safe logging.
     *
     * @param action the string value to escape
     * @return the escaped string with tabs replaced by spaces
     */
    protected String escapeValue(final String action) {
        return action.replace('\t', ' ');
    }

    /**
     * Outputs a log message using the statistics logger.
     *

   * (key) bits 'affects' a strictly smaller set of output bits. Funneling is bad because it can
   * result in more-than-ideal collisions for a non-uniformly distributed key space. In practice,
   * most key spaces are ANYTHING BUT uniformly distributed. A bit(i) in the input is said to
   * 'affect' a bit(j) in the output if two inputs, identical but for bit(i), will differ at output
   * bit(j) about half the time
   *