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;
  
  import java.util.Objects;
  
  /**
   * This represents universally unique identifier with topic id for a topic partition. This makes sure that topics
   * recreated with the same name will always have unique topic identifiers.
   */
  public class TopicIdPartition {
  
      private final Uuid topicId;
      private final TopicPartition topicPartition;
  
      /**
       * Create an instance with the provided parameters.
       *
       * @param topicId the topic id
       * @param topicPartition the topic partition
       */
      public TopicIdPartition(Uuid topicId, TopicPartition topicPartition) {
          this.topicId = Objects.requireNonNull(topicId, "topicId can not be null");
          this.topicPartition = Objects.requireNonNull(topicPartition, "topicPartition can not be null");
      }
  
      /**
       * Create an instance with the provided parameters.
       *
       * @param topicId the topic id
       * @param partition the partition id
       * @param topic the topic name or null
       */
      public TopicIdPartition(Uuid topicId, int partition, String topic) {
          this.topicId = Objects.requireNonNull(topicId, "topicId can not be null");
          this.topicPartition = new TopicPartition(topic, partition);
      }
  
      /**
       * @return Universally unique id representing this topic partition.
       */
      public Uuid topicId() {
          return topicId;
      }
  
      /**
       * @return the topic name or null if it is unknown.
       */
      public String topic() {
          return topicPartition.topic();
      }
  
      /**
       * @return the partition id.
       */
      public int partition() {
          return topicPartition.partition();
      }
  
      /**
       * @return Topic partition representing this instance.
       */
      public TopicPartition topicPartition() {
          return topicPartition;
      }
  
      @Override
      public boolean equals(Object o) {
          if (this == o) {
              return true;
          }
          if (o == null || getClass() != o.getClass()) {
              return false;
          }
          TopicIdPartition that = (TopicIdPartition) o;
          return topicId.equals(that.topicId) &&
                 topicPartition.equals(that.topicPartition);
      }
  
      @Override
      public int hashCode() {
          final int prime = 31;
          int result = prime + topicId.hashCode();
          result = prime * result + topicPartition.hashCode();
          return result;
      }
  
      @Override
      public String toString() {
          return topicId + ":" + topic() + "-" + partition();
      }
  }
  