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public enum ScramMechanism {
    UNKNOWN(0),
    HMACSCRAM_SHA_256(1),
    HMACSCRAM_SHA_512(2);

    byte type;

    private ScramMechanism(byte type) {
        this.type = type;
    }
}

public class ScramCredentialInfo {
    private final ScramMechanism mechanism;
    private final int iterations;
}

public class UserScramCredentialsDescription {
    private final String name;
    private final List<ScramCredentialInfo> infos;
}

public class DescribeScramUserCredentialsOptions extends AbstractOptions<DescribeScramUserCredentialsOptions> { }

// Describe all users.
default DescribeScramUserCredentialsResult describeScramUserCredentials() {
    return describeScramUserCredentials(null);
}

default DescribeScramUserCredentialsResult describeScramUserCredentials(List<String> users) {
    return describeScramUserCredentials(users, new DescribeScramUserCredentialsOptions());
}

DescribeScramUserCredentialsResult describeScramUserCredentials(DescribeScramUserCredentialsOptions options);

public class DescribeScramUserCredentialsResult {
    public KafkaFuture<Map<String, UserScramCredentialsDescription>> all();
}