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public class MemberDescription {
    private final String memberId;
    private final Optional<String> groupInstanceId;
    private final String clientId;
    private final String host;
    private final MemberAssignment assignment;
    private final Optional<MemberAssignment> targetAssignment;
    private final Optional<Integer> memberEpoch;
    private final Optional<Boolean> upgraded;

	public MemberDescription(String memberId,
                             Optional<String> groupInstanceId,
                             String clientId,
                             String host,
                             MemberAssignment assignment,
                             Optional<MemberAssignment> targetAssignment,
                             Optional<Integer> memberEpoch,
                             Optional<Boolean> upgraded
    ) {
        this.memberId = memberId == null ? "" : memberId;
        this.groupInstanceId = groupInstanceId;
        this.clientId = clientId == null ? "" : clientId;
        this.host = host == null ? "" : host;
        this.assignment = assignment == null ?
            new MemberAssignment(Collections.emptySet()) : assignment;
        this.targetAssignment = targetAssignment;
        this.memberEpoch = memberEpoch;
        this.upgraded = upgraded;
    }

    /**
     * @deprecated Since 4.0. Use {@link #MemberDescription(String, Optional, String, String, MemberAssignment, Optional, Optional, Optional)}.
     */
    @Deprecated
    public MemberDescription(String memberId,
                             Optional<String> groupInstanceId,
                             String clientId,
                             String host,
                             MemberAssignment assignment,
                             Optional<MemberAssignment> targetAssignment
    ) {
        this(
            memberId,
            groupInstanceId,
            clientId,
            host,
            assignment,
            targetAssignment,
            Optional.empty(),
            Optional.empty()
        );
    }

    /**
     * @deprecated Since 4.0. Use {@link #MemberDescription(String, Optional, String, String, MemberAssignment, Optional, Optional, Optional)}.
     */
    @Deprecated
    public MemberDescription(
        String memberId,
        Optional<String> groupInstanceId,
        String clientId,
        String host,
        MemberAssignment assignment
    ) {
        this(
            memberId,
            groupInstanceId,
            clientId,
            host,
            assignment,
            Optional.empty()
        );
    }

    /**
     * @deprecated Since 4.0. Use {@link #MemberDescription(String, Optional, String, String, MemberAssignment, Optional, Optional, Optional)}.
     */
    @Deprecated
    public MemberDescription(String memberId,
                             String clientId,
                             String host,
                             MemberAssignment assignment) {
        this(memberId, Optional.empty(), clientId, host, assignment);
    }

	// ...

	/**
	 * The epoch of the group member.
	 */
	public Optional<Integer> memberEpoch() {
		return memberEpoch;
	}

    /**
     * The flag indicating whether a member is classic.
     */
    public Optional<Boolean> upgraded() {
        return upgraded;
    }
}