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.metadata;
  
  import java.util.Optional;
  
  public enum LeaderRecoveryState {
      /**
       * Represent that the election for the partition was either an ISR election or the
       * leader recovered from an unclean leader election.
       */
      RECOVERED((byte) 0),
  
      /**
       * Represent that the election for the partition was an unclean leader election and
       * that the leader is recovering from it.
       */
      RECOVERING((byte) 1);
  
      /**
       * A special value used to represent that the LeaderRecoveryState field of a
       * PartitionChangeRecord didn't change.
       */
      public static final byte NO_CHANGE = (byte) -1;
  
      public static LeaderRecoveryState of(byte value) {
          return optionalOf(value)
              .orElseThrow(() -> new IllegalArgumentException(String.format("Value %s is not a valid leader recovery state", value)));
      }
  
      public static Optional<LeaderRecoveryState> optionalOf(byte value) {
          if (value == RECOVERED.value()) {
              return Optional.of(RECOVERED);
          }
          if (value == RECOVERING.value()) {
              return Optional.of(RECOVERING);
          }
  
          return Optional.empty();
      }
  
      private final byte value;
  
      LeaderRecoveryState(byte value) {
          this.value = value;
      }
  
      public byte value() {
          return value;
      }
  
      public LeaderRecoveryState changeTo(byte value) {
          if (value == NO_CHANGE) {
              return this;
          }
  
          return of(value);
      }
  }
  