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;
018    
019    import org.apache.camel.Exchange;
020    import org.apache.camel.Expression;
021    import org.apache.camel.Message;
022    import org.apache.camel.Processor;
023    import org.apache.camel.impl.DefaultMessage;
024    
025    /**
026     * A processor which sets the body on the IN message with an expression
027     */
028    public class SetBodyProcessor extends DelegateProcessor implements Traceable {
029        private final Expression expression;
030    
031        public SetBodyProcessor(Expression expression) {
032            this.expression = expression;
033        }
034    
035        public SetBodyProcessor(Expression expression, Processor childProcessor) {
036            super(childProcessor);
037            this.expression = expression;
038        }
039    
040        public void process(Exchange exchange) throws Exception {
041            Object newBody = expression.evaluate(exchange, Object.class);
042    
043            Message old = exchange.getIn();
044    
045            // create a new message container so we do not drag specialized message objects along
046            Message msg = new DefaultMessage();
047            msg.copyFrom(old);
048            msg.setBody(newBody);
049            exchange.setIn(msg);
050    
051            super.process(exchange);
052        }
053    
054        @Override
055        public String toString() {
056            return "SetBody(" + expression + (processor != null ? "," + processor : "") + ")";
057        }
058    
059        public String getTraceLabel() {
060            return "setBody[" + expression + "]";
061        }
062    }