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; 018 019import org.apache.camel.AsyncCallback; 020import org.apache.camel.AsyncProcessor; 021import org.apache.camel.Exchange; 022import org.apache.camel.Expression; 023import org.apache.camel.Message; 024import org.apache.camel.Traceable; 025import org.apache.camel.impl.DefaultMessage; 026import org.apache.camel.spi.IdAware; 027import org.apache.camel.support.ServiceSupport; 028import org.apache.camel.util.AsyncProcessorHelper; 029import org.apache.camel.util.ExchangeHelper; 030 031/** 032 * A processor which sets the body on the IN or OUT message with an {@link Expression} 033 */ 034public class SetBodyProcessor extends ServiceSupport implements AsyncProcessor, Traceable, IdAware { 035 private String id; 036 private final Expression expression; 037 038 public SetBodyProcessor(Expression expression) { 039 this.expression = expression; 040 } 041 042 public void process(Exchange exchange) throws Exception { 043 AsyncProcessorHelper.process(this, exchange); 044 } 045 046 @Override 047 public boolean process(Exchange exchange, AsyncCallback callback) { 048 try { 049 Object newBody = expression.evaluate(exchange, Object.class); 050 051 if (exchange.getException() != null) { 052 // the expression threw an exception so we should break-out 053 callback.done(true); 054 return true; 055 } 056 057 boolean out = exchange.hasOut(); 058 Message old = out ? exchange.getOut() : exchange.getIn(); 059 060 // create a new message container so we do not drag specialized message objects along 061 // but that is only needed if the old message is a specialized message 062 boolean copyNeeded = !(old.getClass().equals(DefaultMessage.class)); 063 064 if (copyNeeded) { 065 Message msg = new DefaultMessage(exchange.getContext()); 066 msg.copyFromWithNewBody(old, newBody); 067 068 // replace message on exchange 069 ExchangeHelper.replaceMessage(exchange, msg, false); 070 } else { 071 // no copy needed so set replace value directly 072 old.setBody(newBody); 073 } 074 075 } catch (Throwable e) { 076 exchange.setException(e); 077 } 078 079 callback.done(true); 080 return true; 081 } 082 083 @Override 084 public String toString() { 085 return "SetBody(" + expression + ")"; 086 } 087 088 public String getTraceLabel() { 089 return "setBody[" + expression + "]"; 090 } 091 092 public String getId() { 093 return id; 094 } 095 096 public void setId(String id) { 097 this.id = id; 098 } 099 100 public Expression getExpression() { 101 return expression; 102 } 103 104 @Override 105 protected void doStart() throws Exception { 106 // noop 107 } 108 109 @Override 110 protected void doStop() throws Exception { 111 // noop 112 } 113}