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 org.apache.camel.Exchange; 020 021 /** 022 * An {@link org.apache.camel.processor.aggregate.AggregationStrategy} which just uses the original exchange 023 * which can be needed when you want to preserve the original Exchange. For example when splitting an {@link Exchange} 024 * and then you may want to keep routing using the original {@link Exchange}. 025 * 026 * @see org.apache.camel.processor.Splitter 027 * @version 028 */ 029 public class UseOriginalAggregationStrategy implements AggregationStrategy { 030 031 private final Exchange original; 032 private final boolean propagateException; 033 034 public UseOriginalAggregationStrategy() { 035 this(null, true); 036 } 037 038 public UseOriginalAggregationStrategy(Exchange original, boolean propagateException) { 039 this.original = original; 040 this.propagateException = propagateException; 041 } 042 043 public Exchange aggregate(Exchange oldExchange, Exchange newExchange) { 044 if (propagateException) { 045 Exception exception = checkException(oldExchange, newExchange); 046 if (exception != null) { 047 original.setException(exception); 048 } 049 } 050 return original != null ? original : oldExchange; 051 } 052 053 protected Exception checkException(Exchange oldExchange, Exchange newExchange) { 054 if (oldExchange == null) { 055 return newExchange.getException(); 056 } else { 057 return (newExchange != null && newExchange.getException() != null) 058 ? newExchange.getException() 059 : oldExchange.getException(); 060 } 061 } 062 063 @Override 064 public String toString() { 065 return "UseOriginalAggregationStrategy"; 066 } 067 }