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.common.requests;
  
  import org.apache.kafka.common.TopicPartition;
  import org.apache.kafka.common.message.TxnOffsetCommitResponseData;
  import org.apache.kafka.common.message.TxnOffsetCommitResponseData.TxnOffsetCommitResponsePartition;
  import org.apache.kafka.common.message.TxnOffsetCommitResponseData.TxnOffsetCommitResponseTopic;
  import org.apache.kafka.common.protocol.ApiKeys;
  import org.apache.kafka.common.protocol.Errors;
  import org.apache.kafka.common.protocol.Readable;
  
  import java.util.ArrayList;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  import java.util.function.Function;
  
  /**
   * Possible error codes:
   *
   *   - {@link Errors#INVALID_PRODUCER_EPOCH}
   *   - {@link Errors#NOT_COORDINATOR}
   *   - {@link Errors#COORDINATOR_NOT_AVAILABLE}
   *   - {@link Errors#COORDINATOR_LOAD_IN_PROGRESS}
   *   - {@link Errors#OFFSET_METADATA_TOO_LARGE}
   *   - {@link Errors#GROUP_AUTHORIZATION_FAILED}
   *   - {@link Errors#INVALID_COMMIT_OFFSET_SIZE}
   *   - {@link Errors#TRANSACTIONAL_ID_AUTHORIZATION_FAILED}
   *   - {@link Errors#UNSUPPORTED_FOR_MESSAGE_FORMAT}
   *   - {@link Errors#REQUEST_TIMED_OUT}
   *   - {@link Errors#UNKNOWN_MEMBER_ID}
   *   - {@link Errors#FENCED_INSTANCE_ID}
   *   - {@link Errors#ILLEGAL_GENERATION}
   */
  public class TxnOffsetCommitResponse extends AbstractResponse {
  
      public static class Builder {
          TxnOffsetCommitResponseData data = new TxnOffsetCommitResponseData();
          HashMap<String, TxnOffsetCommitResponseTopic> byTopicName = new HashMap<>();
  
          private TxnOffsetCommitResponseTopic getOrCreateTopic(
              String topicName
          ) {
              TxnOffsetCommitResponseTopic topic = byTopicName.get(topicName);
              if (topic == null) {
                  topic = new TxnOffsetCommitResponseTopic().setName(topicName);
                  data.topics().add(topic);
                  byTopicName.put(topicName, topic);
              }
              return topic;
          }
  
          public Builder addPartition(
              String topicName,
              int partitionIndex,
              Errors error
          ) {
              final TxnOffsetCommitResponseTopic topicResponse = getOrCreateTopic(topicName);
  
              topicResponse.partitions().add(new TxnOffsetCommitResponsePartition()
                  .setPartitionIndex(partitionIndex)
                  .setErrorCode(error.code()));
  
              return this;
          }
  
          public <P> Builder addPartitions(
              String topicName,
              List<P> partitions,
              Function<P, Integer> partitionIndex,
              Errors error
          ) {
              final TxnOffsetCommitResponseTopic topicResponse = getOrCreateTopic(topicName);
  
              partitions.forEach(partition ->
                  topicResponse.partitions().add(new TxnOffsetCommitResponsePartition()
                      .setPartitionIndex(partitionIndex.apply(partition))
                      .setErrorCode(error.code()))
              );
  
              return this;
          }
  
          public Builder merge(
              TxnOffsetCommitResponseData newData
          ) {
              if (data.topics().isEmpty()) {
                  // If the current data is empty, we can discard it and use the new data.
                  data = newData;
              } else {
                  // Otherwise, we have to merge them together.
                  newData.topics().forEach(newTopic -> {
                      TxnOffsetCommitResponseTopic existingTopic = byTopicName.get(newTopic.name());
                      if (existingTopic == null) {
                          // If no topic exists, we can directly copy the new topic data.
                          data.topics().add(newTopic);
                          byTopicName.put(newTopic.name(), newTopic);
                      } else {
                          // Otherwise, we add the partitions to the existing one. Note we
                          // expect non-overlapping partitions here as we don't verify
                          // if the partition is already in the list before adding it.
                          existingTopic.partitions().addAll(newTopic.partitions());
                      }
                  });
              }
  
              return this;
          }
  
          public TxnOffsetCommitResponse build() {
              return new TxnOffsetCommitResponse(data);
          }
      }
  
      private final TxnOffsetCommitResponseData data;
  
      public TxnOffsetCommitResponse(TxnOffsetCommitResponseData data) {
          super(ApiKeys.TXN_OFFSET_COMMIT);
          this.data = data;
      }
  
      public TxnOffsetCommitResponse(int requestThrottleMs, Map<TopicPartition, Errors> responseData) {
          super(ApiKeys.TXN_OFFSET_COMMIT);
          Map<String, TxnOffsetCommitResponseTopic> responseTopicDataMap = new HashMap<>();
  
          for (Map.Entry<TopicPartition, Errors> entry : responseData.entrySet()) {
              TopicPartition topicPartition = entry.getKey();
              String topicName = topicPartition.topic();
  
              TxnOffsetCommitResponseTopic topic = responseTopicDataMap.getOrDefault(
                  topicName, new TxnOffsetCommitResponseTopic().setName(topicName));
  
              topic.partitions().add(new TxnOffsetCommitResponsePartition()
                                         .setErrorCode(entry.getValue().code())
                                         .setPartitionIndex(topicPartition.partition())
              );
              responseTopicDataMap.put(topicName, topic);
          }
  
          data = new TxnOffsetCommitResponseData()
                     .setTopics(new ArrayList<>(responseTopicDataMap.values()))
                     .setThrottleTimeMs(requestThrottleMs);
      }
  
      @Override
      public TxnOffsetCommitResponseData data() {
          return data;
      }
  
      @Override
      public int throttleTimeMs() {
          return data.throttleTimeMs();
      }
  
      @Override
      public void maybeSetThrottleTimeMs(int throttleTimeMs) {
          data.setThrottleTimeMs(throttleTimeMs);
      }
  
      @Override
      public Map<Errors, Integer> errorCounts() {
          return errorCounts(data.topics().stream().flatMap(topic ->
                  topic.partitions().stream().map(partition ->
                          Errors.forCode(partition.errorCode()))));
      }
  
      public Map<TopicPartition, Errors> errors() {
          Map<TopicPartition, Errors> errorMap = new HashMap<>();
          for (TxnOffsetCommitResponseTopic topic : data.topics()) {
              for (TxnOffsetCommitResponsePartition partition : topic.partitions()) {
                  errorMap.put(new TopicPartition(topic.name(), partition.partitionIndex()),
                               Errors.forCode(partition.errorCode()));
              }
          }
          return errorMap;
      }
  
      public static TxnOffsetCommitResponse parse(Readable readable, short version) {
          return new TxnOffsetCommitResponse(new TxnOffsetCommitResponseData(readable, version));
      }
  
      @Override
      public String toString() {
          return data.toString();
      }
  
      @Override
      public boolean shouldClientThrottle(short version) {
          return version >= 1;
      }
  }
  