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