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.image;
  
  import org.apache.kafka.common.metadata.ProducerIdsRecord;
  import org.apache.kafka.image.node.ProducerIdsImageNode;
  import org.apache.kafka.image.writer.ImageWriter;
  import org.apache.kafka.image.writer.ImageWriterOptions;
  
  import java.util.Objects;
  
  
  /**
   * Stores the highest seen producer ID in the metadata image.
   *
   * This class is thread-safe.
   */
  public final class ProducerIdsImage {
      public static final ProducerIdsImage EMPTY = new ProducerIdsImage(-1L);
  
      /**
       * The next producer ID, or -1 in the special case where no producer IDs have been issued.
       */
      private final long nextProducerId;
  
      public ProducerIdsImage(long nextProducerId) {
          this.nextProducerId = nextProducerId;
      }
  
      public long nextProducerId() {
          return nextProducerId;
      }
  
      public void write(ImageWriter writer, ImageWriterOptions options) {
          if (nextProducerId >= 0) {
              writer.write(0, new ProducerIdsRecord().
                      setBrokerId(-1).
                      setBrokerEpoch(-1).
                      setNextProducerId(nextProducerId));
          }
      }
  
      public boolean isEmpty() {
          return nextProducerId == EMPTY.nextProducerId;
      }
  
      @Override
      public boolean equals(Object o) {
          if (!(o instanceof ProducerIdsImage other)) return false;
          return nextProducerId == other.nextProducerId;
      }
  
      @Override
      public int hashCode() {
          return Objects.hash(nextProducerId);
      }
  
      @Override
      public String toString() {
          return new ProducerIdsImageNode(this).stringify();
      }
  }
  