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 * <p/> 028 * <b>Important:</b> This strategy is not to be used with the <a href="http://camel.apache.org/content-enricher.html">Content Enricher</a> EIP 029 * which is enrich or pollEnrich. 030 * 031 * @version 032 */ 033public class GroupedExchangeAggregationStrategy extends AbstractListAggregationStrategy<Exchange> { 034 035 @Override 036 public void onCompletion(Exchange exchange) { 037 if (isStoreAsBodyOnCompletion()) { 038 // lets be backwards compatible 039 // TODO: Remove this method in Camel 3.0 040 List<?> list = (List<?>) exchange.getProperty(Exchange.GROUPED_EXCHANGE); 041 if (list != null) { 042 exchange.getIn().setBody(list); 043 } 044 } 045 } 046 047 @Override 048 public Exchange aggregate(Exchange oldExchange, Exchange newExchange) { 049 if (oldExchange == null) { 050 // for the first time we must create a new empty exchange as the holder, as the outgoing exchange 051 // must not be one of the grouped exchanges, as that causes a endless circular reference 052 oldExchange = new DefaultExchange(newExchange); 053 } 054 return super.aggregate(oldExchange, newExchange); 055 } 056 057 @Override 058 public Exchange getValue(Exchange exchange) { 059 return exchange; 060 } 061 062} 063