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.coordinator.group.streams;
  
  import org.apache.kafka.coordinator.common.runtime.CoordinatorRecord;
  import org.apache.kafka.coordinator.group.generated.StreamsGroupTopologyValue;
  import org.apache.kafka.coordinator.group.generated.StreamsGroupTopologyValue.Subtopology;
  
  import java.util.ArrayList;
  import java.util.Comparator;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  
  public class StreamsGroupBuilder {
  
      private final String groupId;
      private final int groupEpoch;
      private int targetAssignmentEpoch;
      private StreamsTopology topology;
      private final Map<String, StreamsGroupMember> members = new HashMap<>();
      private final Map<String, TasksTuple> targetAssignments = new HashMap<>();
      private long metadataHash = 0L;
  
      public StreamsGroupBuilder(String groupId, int groupEpoch) {
          this.groupId = groupId;
          this.groupEpoch = groupEpoch;
          this.targetAssignmentEpoch = 0;
          this.topology = null;
      }
  
      public StreamsGroupBuilder withMember(StreamsGroupMember member) {
          this.members.put(member.memberId(), member);
          return this;
      }
  
      public StreamsGroupBuilder withMetadataHash(long metadataHash) {
          this.metadataHash = metadataHash;
          return this;
      }
  
      public StreamsGroupBuilder withTopology(StreamsTopology streamsTopology) {
          this.topology = streamsTopology;
          return this;
      }
  
      public StreamsGroupBuilder withTargetAssignment(String memberId, TasksTuple targetAssignment) {
          this.targetAssignments.put(memberId, targetAssignment);
          return this;
      }
  
      public StreamsGroupBuilder withTargetAssignmentEpoch(int targetAssignmentEpoch) {
          this.targetAssignmentEpoch = targetAssignmentEpoch;
          return this;
      }
  
      public List<CoordinatorRecord> build() {
          List<CoordinatorRecord> records = new ArrayList<>();
  
          // Add records for members.
          members.forEach((memberId, member) ->
              records.add(
                  StreamsCoordinatorRecordHelpers.newStreamsGroupMemberRecord(groupId, member))
          );
  
          // Add group epoch record.
          records.add(
              StreamsCoordinatorRecordHelpers.newStreamsGroupEpochRecord(groupId, groupEpoch, metadataHash));
  
          // Add target assignment records.
          targetAssignments.forEach((memberId, assignment) ->
              records.add(
                  StreamsCoordinatorRecordHelpers.newStreamsGroupTargetAssignmentRecord(groupId, memberId, assignment))
          );
  
          // Add topology record.
          if (topology != null) {
              records.add(StreamsCoordinatorRecordHelpers.newStreamsGroupTopologyRecord(
                  groupId,
                      new StreamsGroupTopologyValue()
                          .setEpoch(topology.topologyEpoch())
                          .setSubtopologies(topology.subtopologies().values().stream().sorted(Comparator.comparing(Subtopology::subtopologyId)).toList()))
              );
          }
  
          // Add target assignment epoch.
          records.add(StreamsCoordinatorRecordHelpers.newStreamsGroupTargetAssignmentEpochRecord(groupId,
              targetAssignmentEpoch));
  
          // Add current assignment records for members.
          members.forEach((memberId, member) ->
              records.add(
                  StreamsCoordinatorRecordHelpers.newStreamsGroupCurrentAssignmentRecord(groupId, member))
          );
  
          return records;
      }
  
      public String groupId() {
          return groupId;
      }
  }
  