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.admin;
  
  import org.apache.kafka.common.KafkaFuture;
  import org.apache.kafka.common.TopicPartition;
  
  import java.util.HashMap;
  import java.util.Map;
  import java.util.Optional;
  import java.util.concurrent.ExecutionException;
  
  /**
   * The result of the {@link AdminClient#listOffsets(Map)} call.
   */
  public class ListOffsetsResult {
  
      private final Map<TopicPartition, KafkaFuture<ListOffsetsResultInfo>> futures;
  
      public ListOffsetsResult(Map<TopicPartition, KafkaFuture<ListOffsetsResultInfo>> futures) {
          this.futures = futures;
      }
  
      /**
      * Return a future which can be used to check the result for a given partition.
      */
      public KafkaFuture<ListOffsetsResultInfo> partitionResult(final TopicPartition partition) {
          KafkaFuture<ListOffsetsResultInfo> future = futures.get(partition);
          if (future == null) {
              throw new IllegalArgumentException(
                      "List Offsets for partition \"" + partition + "\" was not attempted");
          }
          return future;
      }
  
      /**
       * Return a future which succeeds only if offsets for all specified partitions have been successfully
       * retrieved.
       */
      public KafkaFuture<Map<TopicPartition, ListOffsetsResultInfo>> all() {
          return KafkaFuture.allOf(futures.values().toArray(new KafkaFuture<?>[0]))
                  .thenApply(v -> {
                      Map<TopicPartition, ListOffsetsResultInfo> offsets = new HashMap<>(futures.size());
                      for (Map.Entry<TopicPartition, KafkaFuture<ListOffsetsResultInfo>> entry : futures.entrySet()) {
                          try {
                              offsets.put(entry.getKey(), entry.getValue().get());
                          } catch (InterruptedException | ExecutionException e) {
                              // This should be unreachable, because allOf ensured that all the futures completed successfully.
                              throw new RuntimeException(e);
                          }
                      }
                      return offsets;
                  });
      }
  
      public static class ListOffsetsResultInfo {
  
          private final long offset;
          private final long timestamp;
          private final Optional<Integer> leaderEpoch;
  
          public ListOffsetsResultInfo(long offset, long timestamp, Optional<Integer> leaderEpoch) {
              this.offset = offset;
              this.timestamp = timestamp;
              this.leaderEpoch = leaderEpoch;
          }
  
          public long offset() {
              return offset;
          }
  
          public long timestamp() {
              return timestamp;
          }
  
          public Optional<Integer> leaderEpoch() {
              return leaderEpoch;
          }
  
          @Override
          public String toString() {
              return "ListOffsetsResultInfo(offset=" + offset + ", timestamp=" + timestamp + ", leaderEpoch="
                      + leaderEpoch + ")";
          }
      }
  }
  