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 java.io.ByteArrayOutputStream;
020    
021    import org.apache.camel.CamelContext;
022    import org.apache.camel.CamelContextAware;
023    import org.apache.camel.Exchange;
024    import org.apache.camel.Message;
025    import org.apache.camel.Processor;
026    import org.apache.camel.Traceable;
027    import org.apache.camel.spi.DataFormat;
028    import org.apache.camel.support.ServiceSupport;
029    import org.apache.camel.util.ObjectHelper;
030    import org.apache.camel.util.ServiceHelper;
031    
032    /**
033     * Marshals the body of the incoming message using the given
034     * <a href="http://camel.apache.org/data-format.html">data format</a>
035     *
036     * @version 
037     */
038    public class MarshalProcessor extends ServiceSupport implements Processor, Traceable, CamelContextAware {
039        private CamelContext camelContext;
040        private final DataFormat dataFormat;
041    
042        public MarshalProcessor(DataFormat dataFormat) {
043            this.dataFormat = dataFormat;
044        }
045    
046        public void process(Exchange exchange) throws Exception {
047            ObjectHelper.notNull(dataFormat, "dataFormat");
048    
049            ByteArrayOutputStream buffer = new ByteArrayOutputStream();
050            Message in = exchange.getIn();
051            Object body = in.getBody();
052    
053            // lets setup the out message before we invoke the dataFormat
054            // so that it can mutate it if necessary
055            Message out = exchange.getOut();
056            out.copyFrom(in);
057    
058            try {
059                dataFormat.marshal(exchange, body, buffer);
060                byte[] data = buffer.toByteArray();
061                out.setBody(data);
062            } catch (Exception e) {
063                // remove OUT message, as an exception occurred
064                exchange.setOut(null);
065                throw e;
066            }
067        }
068    
069        @Override
070        public String toString() {
071            return "Marshal[" + dataFormat + "]";
072        }
073    
074        public String getTraceLabel() {
075            return "marshal[" + dataFormat + "]";
076        }
077    
078        public CamelContext getCamelContext() {
079            return camelContext;
080        }
081    
082        public void setCamelContext(CamelContext camelContext) {
083            this.camelContext = camelContext;
084        }
085    
086        @Override
087        protected void doStart() throws Exception {
088            // inject CamelContext on data format
089            if (dataFormat instanceof CamelContextAware) {
090                ((CamelContextAware) dataFormat).setCamelContext(camelContext);
091            }
092            ServiceHelper.startService(dataFormat);
093        }
094    
095        @Override
096        protected void doStop() throws Exception {
097            ServiceHelper.stopService(dataFormat);
098        }
099    }