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.InputStream;
020
021 import org.apache.camel.AsyncCallback;
022 import org.apache.camel.AsyncProcessor;
023 import org.apache.camel.CamelContext;
024 import org.apache.camel.CamelContextAware;
025 import org.apache.camel.Exchange;
026 import org.apache.camel.Message;
027 import org.apache.camel.RuntimeCamelException;
028 import org.apache.camel.Traceable;
029 import org.apache.camel.spi.DataFormat;
030 import org.apache.camel.support.ServiceSupport;
031 import org.apache.camel.util.AsyncProcessorHelper;
032 import org.apache.camel.util.IOHelper;
033 import org.apache.camel.util.ObjectHelper;
034 import org.apache.camel.util.ServiceHelper;
035
036 /**
037 * Unmarshals the body of the incoming message using the given
038 * <a href="http://camel.apache.org/data-format.html">data format</a>
039 *
040 * @version
041 */
042 public class UnmarshalProcessor extends ServiceSupport implements AsyncProcessor, Traceable, CamelContextAware {
043 private CamelContext camelContext;
044 private final DataFormat dataFormat;
045
046 public UnmarshalProcessor(DataFormat dataFormat) {
047 this.dataFormat = dataFormat;
048 }
049
050 public void process(Exchange exchange) throws Exception {
051 AsyncProcessorHelper.process(this, exchange);
052 }
053
054 public boolean process(Exchange exchange, AsyncCallback callback) {
055 ObjectHelper.notNull(dataFormat, "dataFormat");
056
057 InputStream stream = null;
058 try {
059 stream = exchange.getIn().getMandatoryBody(InputStream.class);
060
061 // lets setup the out message before we invoke the dataFormat so that it can mutate it if necessary
062 Message out = exchange.getOut();
063 out.copyFrom(exchange.getIn());
064
065 Object result = dataFormat.unmarshal(exchange, stream);
066 if (result instanceof Exchange) {
067 if (result != exchange) {
068 // it's not allowed to return another exchange other than the one provided to dataFormat
069 throw new RuntimeCamelException("The returned exchange " + result + " is not the same as " + exchange + " provided to the DataFormat");
070 }
071 } else if (result instanceof Message) {
072 // the dataformat has probably set headers, attachments, etc. so let's use it as the outbound payload
073 exchange.setOut((Message) result);
074 } else {
075 out.setBody(result);
076 }
077 } catch (Exception e) {
078 // remove OUT message, as an exception occurred
079 exchange.setOut(null);
080 exchange.setException(e);
081 } finally {
082 IOHelper.close(stream, "input stream");
083 }
084
085 callback.done(true);
086 return true;
087 }
088
089 public String toString() {
090 return "Unmarshal[" + dataFormat + "]";
091 }
092
093 public String getTraceLabel() {
094 return "unmarshal[" + dataFormat + "]";
095 }
096
097 public CamelContext getCamelContext() {
098 return camelContext;
099 }
100
101 public void setCamelContext(CamelContext camelContext) {
102 this.camelContext = camelContext;
103 }
104
105 @Override
106 protected void doStart() throws Exception {
107 // inject CamelContext on data format
108 if (dataFormat instanceof CamelContextAware) {
109 ((CamelContextAware) dataFormat).setCamelContext(camelContext);
110 }
111 ServiceHelper.startService(dataFormat);
112 }
113
114 @Override
115 protected void doStop() throws Exception {
116 ServiceHelper.stopService(dataFormat);
117 }
118
119 }