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.io.Serializable;
  import java.util.Objects;
  
  /**
   * A topic name and partition number
   */
  public final class TopicPartition implements Serializable {
      private static final long serialVersionUID = -613627415771699627L;
  
      private int hash = 0;
      private final int partition;
      private final String topic;
  
      public TopicPartition(String topic, int partition) {
          this.partition = partition;
          this.topic = topic;
      }
  
      public int partition() {
          return partition;
      }
  
      public String topic() {
          return topic;
      }
  
      @Override
      public int hashCode() {
          if (hash != 0)
              return hash;
          final int prime = 31;
          int result = prime + partition;
          result = prime * result + Objects.hashCode(topic);
          this.hash = result;
          return result;
      }
  
      @Override
      public boolean equals(Object obj) {
          if (this == obj)
              return true;
          if (obj == null)
              return false;
          if (getClass() != obj.getClass())
              return false;
          TopicPartition other = (TopicPartition) obj;
          return partition == other.partition && Objects.equals(topic, other.topic);
      }
  
      @Override
      public String toString() {
          return topic + "-" + partition;
      }
  }
  