*   <li>An IPv6 address string with or without brackets, like {@code [2001:db8::1]} or {@code
   *       2001:db8::1}
   * </ul>
   *
   * @throws IllegalArgumentException if the specifier is not valid.
   */
  public static HostSpecifier fromValid(String specifier) {
    // Verify that no port was specified, and strip optional brackets from
    // IPv6 literals.

            InputLocationTracker tracker) {
        if (!validateNotNull(prefix, fieldName, problems, severity, version, string, sourceHint, tracker)) {
            return false;
        }

        if (!string.isEmpty()) {
            return true;
        }

        addViolation(problems, severity, version, prefix + fieldName, sourceHint, "is missing.", tracker);

        return false;
    }

        packet.nameTrnId = 0x1234;
        packet.isResponse = true;
        packet.opCode = NameServicePacket.QUERY;
        packet.isAuthAnswer = true;
        packet.isTruncated = true;
        packet.isRecurDesired = true;
        packet.isRecurAvailable = true;
        packet.isBroadcast = true;
        packet.resultCode = NameServicePacket.FMT_ERR;
        packet.questionCount = 1;
        packet.answerCount = 2;

    int DCERPC_OBJECT_UUID = 0x80; /* if true, a non-nil object UUID */

    // Packet Types (ptype)
    /**
     * Request packet type
     */
    int RPC_PT_REQUEST = 0x00;
    /**
     * Ping packet type
     */
    int RPC_PT_PING = 0x01;
    /**
     * Response packet type
     */
    int RPC_PT_RESPONSE = 0x02;
    /**
     * Fault packet type - indicates an error
     */
    int RPC_PT_FAULT = 0x03;
    /**

        try {
            final Bucket existingBucket = storage.get(bucket);
            if (existingBucket == null) {
                storage.create(BucketInfo.newBuilder(bucket).build());
                logger.info("Created storage bucket: {}", bucket);
            }
        } catch (final Exception e) {
            logger.warn("Failed to ensure bucket exists: {}", bucket, e);
        }
    }

    @Override

        // Various GCS bucket and path formats
        assertEquals("gcs://bucket/", wizardAction.convertCrawlingPath("gcs://bucket/"));
        assertEquals("gcs://my-bucket/", wizardAction.convertCrawlingPath("gcs://my-bucket/"));
        assertEquals("gcs://bucket.with.dots/path", wizardAction.convertCrawlingPath("gcs://bucket.with.dots/path"));

        assertTrue(goAction.isFileSystemPath("s3://my-bucket-name/deep/nested/path/file.txt"));
        assertTrue(goAction.isFileSystemPath("s3://bucket-with-dashes/file"));
    }

    @Test
    public void test_isFileSystemPath_gcs_protocol() {
        assertTrue(goAction.isFileSystemPath("gcs://bucket/path/to/file.txt"));
        assertTrue(goAction.isFileSystemPath("gcs://my-bucket/folder/document.pdf"));

```

### Generic types { #generic-types }

Some types can take "type parameters" in square brackets, to define their internal types, for example a "list of strings" would be declared `list[str]`.

These types that can take type parameters are called **Generic types** or **Generics**.

You can use the same builtin types as generics (with square brackets and types inside):

* `list`
* `tuple`
* `set`
* `dict`

        url = "s3://my-bucket/path/to/file";
        exp = "my-bucket";
        assertEquals(exp, transformer.getHostOnFile(url));

        url = "gcs://my-bucket/path/to/file";
        exp = "my-bucket";
        assertEquals(exp, transformer.getHostOnFile(url));

        url = "s3://bucket-with-dashes/file";
        exp = "bucket-with-dashes";

        assertTrue(protocolHelper.isValidFileProtocol("s3://bucket/path/to/file"));
        assertTrue(protocolHelper.isValidFileProtocol("gcs://bucket/path/to/file"));
        assertTrue(protocolHelper.isValidFileProtocol("s3://my-bucket/"));
        assertTrue(protocolHelper.isValidFileProtocol("gcs://my-bucket/folder/document.pdf"));

        assertFalse(protocolHelper.isValidWebProtocol("s3://bucket/path"));