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.attachment;
  
  import jakarta.activation.DataHandler;
  
  import org.apache.camel.AggregationStrategy;
  import org.apache.camel.Exchange;
  import org.apache.camel.builder.Builder;
  import org.apache.camel.builder.ExchangeBuilder;
  import org.apache.camel.builder.RouteBuilder;
  import org.apache.camel.impl.DefaultCamelContext;
  import org.apache.camel.test.junit5.CamelTestSupport;
  import org.junit.jupiter.api.Test;
  
  import static org.junit.jupiter.api.Assertions.assertTrue;
  
  class MulticastAggregationStrategyTest extends CamelTestSupport {
  
      @Test
      void testAggregationStrategyWithAttachment() {
          Exchange exchange = ExchangeBuilder.anExchange(new DefaultCamelContext()).build();
  
          template.send("direct:start", exchange);
  
          AttachmentMessage msg = exchange.getMessage(AttachmentMessage.class);
  
          assertTrue(msg.hasAttachments());
      }
  
      @Override
      protected RouteBuilder createRouteBuilder() {
          return new RouteBuilder() {
              @Override
              public void configure() {
                  from("direct:start")
                      .multicast(new AttachmentMessageAggregationStrategy()).stopOnException()
                          .to("direct:setBody", "direct:setAttachment")
                      .end();
  
                  from("direct:setBody")
                          .setBody(Builder.constant("body"));
  
                  from("direct:setAttachment")
                          .setBody(Builder.constant("attachment".getBytes()));
              }
          };
      }
  
      private static class AttachmentMessageAggregationStrategy implements AggregationStrategy {
  
          @Override
          public Exchange aggregate(Exchange oldExchange, Exchange newExchange) {
              if (oldExchange == null) {
                  return newExchange;
              }
  
              if (newExchange.getIn().getBody() instanceof String) {
                  oldExchange.getMessage().setBody(newExchange.getIn().getBody());
              } else {
                  byte[] data = newExchange.getIn().getBody(byte[].class);
                  oldExchange.getMessage(AttachmentMessage.class).addAttachment("attachment",
                          new DataHandler(data, "text/plain"));
              }
  
              return oldExchange;
          }
      }
  }
  