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.Processor;
022    import org.apache.commons.logging.Log;
023    import org.apache.commons.logging.LogFactory;
024    
025    /**
026     * A processor which sets the body on the OUT message with an expression
027     */
028    public class TransformProcessor extends DelegateProcessor implements Processor {
029        private static final transient Log LOG = LogFactory.getLog(TransformProcessor.class);
030        private Expression expression;
031    
032        public TransformProcessor(Expression expression) {
033            this.expression = expression;
034        }
035    
036        public TransformProcessor(Expression expression, Processor childProcessor) {
037            super(childProcessor);
038            this.expression = expression;
039        }
040    
041        public void process(Exchange exchange) throws Exception {
042            Object newBody = expression.evaluate(exchange);
043            exchange.getOut().setBody(newBody);
044    
045            // propagate headers
046            exchange.getOut().getHeaders().putAll(exchange.getIn().getHeaders());
047            
048            super.process(exchange);
049        }
050    
051        @Override
052        public String toString() {
053            return "transform(" + expression + "," + processor + ")";
054        }
055    }