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 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 */ 029public 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(boolean propagateException) { 039 this(null, propagateException); 040 } 041 042 public UseOriginalAggregationStrategy(Exchange original, boolean propagateException) { 043 this.original = original; 044 this.propagateException = propagateException; 045 } 046 047 /** 048 * Creates a new instance as a clone of this strategy with the new given original. 049 */ 050 public UseOriginalAggregationStrategy newInstance(Exchange original) { 051 return new UseOriginalAggregationStrategy(original, propagateException); 052 } 053 054 public Exchange aggregate(Exchange oldExchange, Exchange newExchange) { 055 if (propagateException) { 056 Exception exception = checkException(oldExchange, newExchange); 057 if (exception != null) { 058 if (original != null) { 059 original.setException(exception); 060 } else { 061 oldExchange.setException(exception); 062 } 063 } 064 } 065 return original != null ? original : oldExchange; 066 } 067 068 protected Exception checkException(Exchange oldExchange, Exchange newExchange) { 069 if (oldExchange == null) { 070 return newExchange.getException(); 071 } else { 072 return (newExchange != null && newExchange.getException() != null) 073 ? newExchange.getException() 074 : oldExchange.getException(); 075 } 076 } 077 078 public Exchange getOriginal() { 079 return original; 080 } 081 082 @Deprecated 083 public void setOriginal(Exchange original) { 084 throw new UnsupportedOperationException("This method is deprecated"); 085 } 086 087 @Override 088 public String toString() { 089 return "UseOriginalAggregationStrategy"; 090 } 091}