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.raft;
  
  import org.apache.kafka.common.Uuid;
  
  import java.util.Objects;
  import java.util.Optional;
  
  public final class ReplicaKey implements Comparable<ReplicaKey> {
      public static final Uuid NO_DIRECTORY_ID = Uuid.ZERO_UUID;
  
      private final int id;
      private final Optional<Uuid> directoryId;
  
      private ReplicaKey(int id, Optional<Uuid> directoryId) {
          this.id = id;
          this.directoryId = directoryId;
      }
  
      public int id() {
          return id;
      }
  
      public Optional<Uuid> directoryId() {
          return directoryId;
      }
  
      @Override
      public int compareTo(ReplicaKey that) {
          int idComparison = Integer.compare(this.id, that.id);
          if (idComparison == 0) {
              return directoryId
                  .orElse(NO_DIRECTORY_ID)
                  .compareTo(that.directoryId.orElse(NO_DIRECTORY_ID));
          } else {
              return idComparison;
          }
      }
  
      @Override
      public boolean equals(Object o) {
          if (this == o) return true;
          if (o == null || getClass() != o.getClass()) return false;
  
          ReplicaKey that = (ReplicaKey) o;
  
          if (id != that.id) return false;
          return Objects.equals(directoryId, that.directoryId);
      }
  
      @Override
      public int hashCode() {
          return Objects.hash(id, directoryId);
      }
  
      @Override
      public String toString() {
          return String.format("ReplicaKey(id=%d, directoryId=%s)", id, directoryId.map(Uuid::toString).orElse("<undefined>"));
      }
  
      public static ReplicaKey of(int id, Uuid directoryId) {
          return new ReplicaKey(
              id,
              directoryId.equals(NO_DIRECTORY_ID) ? Optional.empty() : Optional.of(directoryId)
          );
      }
  }
  