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 */ 017package org.apache.camel.processor.aggregate; 018 019import java.util.List; 020 021import org.apache.camel.Exchange; 022import org.apache.camel.impl.DefaultExchange; 023 024/** 025 * Aggregate all exchanges into a single combined Exchange holding all the aggregated exchanges 026 * in a {@link List} of {@link Exchange} as the message body. 027 * 028 * @version 029 */ 030public class GroupedExchangeAggregationStrategy extends AbstractListAggregationStrategy<Exchange> { 031 032 @Override 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 if (oldExchange == null) { 047 // for the first time we must create a new empty exchange as the holder, as the outgoing exchange 048 // must not be one of the grouped exchanges, as that causes a endless circular reference 049 oldExchange = new DefaultExchange(newExchange); 050 } 051 return super.aggregate(oldExchange, newExchange); 052 } 053 054 @Override 055 public Exchange getValue(Exchange exchange) { 056 return exchange; 057 } 058 059} 060