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.example;
  
  import org.apache.camel.AggregationStrategy;
  import org.apache.camel.Exchange;
  
  /**
   * Aggregate two numbers
   */
  // START SNIPPET: e1
  public class NumberAggregationStrategy implements AggregationStrategy {
  
      @Override
      public Exchange aggregate(Exchange oldExchange, Exchange newExchange) {
          if (oldExchange == null) {
              return newExchange;
          }
  
          // check for stop command
          String input = newExchange.getIn().getBody(String.class);
          if ("STOP".equalsIgnoreCase(input)) {
              return oldExchange;
          }
  
          Integer num1 = oldExchange.getIn().getBody(Integer.class);
          Integer num2 = newExchange.getIn().getBody(Integer.class);
  
          // just avoid bad inputs by assuming its a 0 value
          Integer num3 = (num1 != null ? num1 : 0) + (num2 != null ? num2 : 0);
          oldExchange.getIn().setBody(num3);
  
          return oldExchange;
      }
  
  }
  // END SNIPPET: e1
  