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.ArrayList; 020 import java.util.List; 021 022 import org.apache.camel.Exchange; 023 import org.apache.camel.impl.DefaultExchange; 024 025 /** 026 * Aggregate all exchanges into a single combined Exchange holding all the aggregated exchanges 027 * in a {@link java.util.List} as a exchange property with the key 028 * {@link org.apache.camel.Exchange#GROUPED_EXCHANGE}. 029 * 030 * @version $Revision: 885364 $ 031 */ 032 public class GroupedExchangeAggregationStrategy implements AggregationStrategy { 033 034 @SuppressWarnings("unchecked") 035 public Exchange aggregate(Exchange oldExchange, Exchange newExchange) { 036 List<Exchange> list; 037 Exchange answer = oldExchange; 038 039 if (oldExchange == null) { 040 answer = new DefaultExchange(newExchange); 041 list = new ArrayList<Exchange>(); 042 answer.setProperty(Exchange.GROUPED_EXCHANGE, list); 043 } else { 044 list = oldExchange.getProperty(Exchange.GROUPED_EXCHANGE, List.class); 045 } 046 047 if (newExchange != null) { 048 list.add(newExchange); 049 } 050 return answer; 051 } 052 053 } 054