content: /*
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements. See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF licenses this file to You under the Apache License, Version 2.0
   * (the "License"); you may not use this file except in compliance with
   * the License. You may obtain a copy of the License at
   *
   *    http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package org.apache.kafka.clients.consumer;
  
  import org.apache.kafka.common.requests.JoinGroupRequest;
  
  import java.util.Objects;
  import java.util.Optional;
  
  /**
   * A metadata struct containing the consumer group information.
   * Note: Any change to this class is considered public and requires a KIP.
   */
  public class ConsumerGroupMetadata {
      private final String groupId;
      private final int generationId;
      private final String memberId;
      private final Optional<String> groupInstanceId;
  
      public ConsumerGroupMetadata(String groupId,
                                   int generationId,
                                   String memberId,
                                   Optional<String> groupInstanceId) {
          this.groupId = Objects.requireNonNull(groupId, "group.id can't be null");
          this.generationId = generationId;
          this.memberId = Objects.requireNonNull(memberId, "member.id can't be null");
          this.groupInstanceId = Objects.requireNonNull(groupInstanceId, "group.instance.id can't be null");
      }
  
      public ConsumerGroupMetadata(String groupId) {
          this(groupId,
              JoinGroupRequest.UNKNOWN_GENERATION_ID,
              JoinGroupRequest.UNKNOWN_MEMBER_ID,
              Optional.empty());
      }
  
      public String groupId() {
          return groupId;
      }
  
      public int generationId() {
          return generationId;
      }
  
      public String memberId() {
          return memberId;
      }
  
      public Optional<String> groupInstanceId() {
          return groupInstanceId;
      }
  
      @Override
      public String toString() {
          return String.format("GroupMetadata(groupId = %s, generationId = %d, memberId = %s, groupInstanceId = %s)",
              groupId,
              generationId,
              memberId,
              groupInstanceId.orElse(""));
      }
  
      @Override
      public boolean equals(final Object o) {
          if (this == o) return true;
          if (o == null || getClass() != o.getClass()) return false;
          final ConsumerGroupMetadata that = (ConsumerGroupMetadata) o;
          return generationId == that.generationId &&
              Objects.equals(groupId, that.groupId) &&
              Objects.equals(memberId, that.memberId) &&
              Objects.equals(groupInstanceId, that.groupInstanceId);
      }
  
      @Override
      public int hashCode() {
          return Objects.hash(groupId, generationId, memberId, groupInstanceId);
      }
  
  }
  