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 java.util.Objects;
  import java.util.OptionalInt;
  
  public class LeaderAndEpoch {
      private final OptionalInt leaderId;
      private final int epoch;
      public static final LeaderAndEpoch UNKNOWN = new LeaderAndEpoch(OptionalInt.empty(), 0);
  
      public LeaderAndEpoch(OptionalInt leaderId, int epoch) {
          this.leaderId = Objects.requireNonNull(leaderId);
          this.epoch = epoch;
      }
  
      public OptionalInt leaderId() {
          return leaderId;
      }
  
      public int epoch() {
          return epoch;
      }
  
      public boolean isLeader(int nodeId) {
          return leaderId.isPresent() && leaderId.getAsInt() == nodeId;
      }
  
      @Override
      public boolean equals(Object o) {
          if (this == o) return true;
          if (o == null || getClass() != o.getClass()) return false;
          LeaderAndEpoch that = (LeaderAndEpoch) o;
          return epoch == that.epoch &&
              leaderId.equals(that.leaderId);
      }
  
      @Override
      public int hashCode() {
          return Objects.hash(leaderId, epoch);
      }
  
      @Override
      public String toString() {
          return "LeaderAndEpoch(" +
              "leaderId=" + leaderId +
              ", epoch=" + epoch +
              ')';
      }
  }
  