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.camel.component.kafka.consumer.support.resume;
  
  import org.apache.camel.Exchange;
  import org.apache.camel.component.kafka.KafkaConstants;
  import org.apache.camel.resume.Offset;
  import org.apache.camel.resume.OffsetKey;
  import org.apache.camel.resume.Resumable;
  import org.apache.camel.support.resume.OffsetKeys;
  import org.apache.camel.support.resume.Offsets;
  
  public final class KafkaResumable implements Resumable {
      private final String addressable;
      private final Long offset;
  
      private KafkaResumable(String addressable, Long offset) {
          this.addressable = addressable;
          this.offset = offset;
      }
  
      @Override
      public OffsetKey<?> getOffsetKey() {
          return OffsetKeys.unmodifiableOf(addressable);
      }
  
      @Override
      public Offset<?> getLastOffset() {
          return Offsets.of(offset);
      }
  
      /**
       * Creates a new resumable for Kafka
       *
       * @param  exchange the exchange to create the resumable from
       * @return          a new KafkaResumable instance with the data from the exchange
       */
      public static KafkaResumable of(Exchange exchange) {
          String topic = exchange.getMessage().getHeader(KafkaConstants.TOPIC, String.class);
          Integer partition = exchange.getMessage().getHeader(KafkaConstants.PARTITION, Integer.class);
          Long offset = exchange.getMessage().getHeader(KafkaConstants.OFFSET, Long.class);
  
          String topicPartition = topic + "/" + partition;
  
          return new KafkaResumable(topicPartition, offset);
      }
  }
  