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.redis.processor.aggregate.integration;
  
  import org.apache.camel.AggregationStrategy;
  import org.apache.camel.Exchange;
  
  /**
   * This is the aggregation strategy which is java code for <i>aggregating</i> incoming messages with the existing
   * aggregated message. In other words you use this strategy to <i>merge</i> the messages together.
   */
  public class MyAggregationStrategy implements AggregationStrategy {
  
      /**
       * Aggregates the messages.
       *
       * @param  oldExchange the existing aggregated message. Is <tt>null</tt> the very first time as there are no
       *                     existing message.
       * @param  newExchange the incoming message. This is never <tt>null</tt>.
       * @return             the aggregated message.
       */
      public Exchange aggregate(Exchange oldExchange, Exchange newExchange) {
          // the first time there are no existing message and therefore
          // the oldExchange is null. In these cases we just return
          // the newExchange
          if (oldExchange == null) {
              return newExchange;
          }
  
          // now we have both an existing message (oldExchange)
          // and a incoming message (newExchange)
          // we want to merge together.
  
          // in this example we add their bodies
          String oldBody = oldExchange.getIn().getBody(String.class).trim();
          String newBody = newExchange.getIn().getBody(String.class).trim();
  
          // the body should be the two bodies added together
          String body = oldBody + newBody;
  
          // update the existing message with the added body
          oldExchange.getIn().setBody(body);
          // and return it
          return oldExchange;
      }
  
  }
  