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.common.replica;
  
  import java.util.Collections;
  import java.util.Objects;
  import java.util.Set;
  
  /**
   * View of a partition used by {@link ReplicaSelector} to determine a preferred replica.
   */
  public interface PartitionView {
      Set<ReplicaView> replicas();
  
      ReplicaView leader();
  
      class DefaultPartitionView implements PartitionView {
          private final Set<ReplicaView> replicas;
          private final ReplicaView leader;
  
          public DefaultPartitionView(Set<ReplicaView> replicas, ReplicaView leader) {
              this.replicas = Collections.unmodifiableSet(replicas);
              this.leader = leader;
          }
  
          @Override
          public Set<ReplicaView> replicas() {
              return replicas;
          }
  
          @Override
          public ReplicaView leader() {
              return leader;
          }
  
          @Override
          public boolean equals(Object o) {
              if (this == o) return true;
              if (o == null || getClass() != o.getClass()) return false;
              DefaultPartitionView that = (DefaultPartitionView) o;
              return Objects.equals(replicas, that.replicas) &&
                      Objects.equals(leader, that.leader);
          }
  
          @Override
          public int hashCode() {
              return Objects.hash(replicas, leader);
          }
  
          @Override
          public String toString() {
              return "DefaultPartitionView{" +
                      "replicas=" + replicas +
                      ", leader=" + leader +
                      '}';
          }
      }
  }
  