001 /** 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017 package org.apache.camel.processor.aggregate; 018 019 import java.util.List; 020 021 import org.apache.camel.Exchange; 022 023 /** 024 * Aggregate all exchanges into a single combined Exchange holding all the aggregated exchanges 025 * in a {@link java.util.List<Exchange>} as the message body. 026 * 027 * @version 028 */ 029 public class GroupedExchangeAggregationStrategy extends AbstractListAggregationStrategy<Exchange> { 030 031 @Override 032 @SuppressWarnings("unchecked") 033 public void onCompletion(Exchange exchange) { 034 if (isStoreAsBodyOnCompletion()) { 035 // lets be backwards compatible 036 // TODO: Remove this method in Camel 3.0 037 List list = (List) exchange.getProperty(Exchange.GROUPED_EXCHANGE); 038 if (list != null) { 039 exchange.getIn().setBody(list); 040 } 041 } 042 } 043 044 @Override 045 public Exchange aggregate(Exchange oldExchange, Exchange newExchange) { 046 Exchange answer = super.aggregate(oldExchange, newExchange); 047 if (oldExchange == null) { 048 // for the first time we must do a copy as the answer, so the outgoing 049 // exchange is not one of the grouped exchanges, as that causes a endless circular reference 050 answer = answer.copy(); 051 } 052 return answer; 053 } 054 055 @Override 056 public Exchange getValue(Exchange exchange) { 057 return exchange; 058 } 059 060 } 061