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;
  
  import org.apache.kafka.common.Uuid;
  import org.apache.kafka.common.metadata.PartitionRecord;
  import org.apache.kafka.common.metadata.RegisterBrokerRecord;
  import org.apache.kafka.common.metadata.TopicRecord;
  import org.apache.kafka.image.MetadataDelta;
  import org.apache.kafka.image.MetadataImage;
  import org.apache.kafka.image.MetadataProvenance;
  
  import java.util.Arrays;
  
  public class MetadataImageBuilder {
      private final MetadataDelta delta;
  
      public MetadataImageBuilder() {
          this(MetadataImage.EMPTY);
      }
  
      public MetadataImageBuilder(MetadataImage image) {
          this.delta = new MetadataDelta(image);
      }
  
      public MetadataImageBuilder addTopic(
          Uuid topicId,
          String topicName,
          int numPartitions
      ) {
          // For testing purposes, the following criteria are used:
          // - Number of replicas for each partition: 2
          // - Number of brokers available in the cluster: 4
          delta.replay(new TopicRecord().setTopicId(topicId).setName(topicName));
          for (int i = 0; i < numPartitions; i++) {
              delta.replay(new PartitionRecord()
                  .setTopicId(topicId)
                  .setPartitionId(i)
                  .setReplicas(Arrays.asList(i % 4, (i + 1) % 4)));
          }
          return this;
      }
  
      /**
       * Add rack Ids for 4 broker Ids.
       * <p>
       * For testing purposes, each broker is mapped
       * to a rack Id with the same broker Id as a suffix.
       */
      public MetadataImageBuilder addRacks() {
          for (int i = 0; i < 4; i++) {
              delta.replay(new RegisterBrokerRecord().setBrokerId(i).setRack("rack" + i));
          }
          return this;
      }
  
      public MetadataImage build() {
          return build(0);
      }
  
      public MetadataImage build(long version) {
          return delta.apply(new MetadataProvenance(version, 0, 0L, true));
      }
  }
  