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1   /*
2    * $Id: TransformerComponent.java 7976 2007-08-21 14:26:13Z dirk.olmes $
3    * --------------------------------------------------------------------------------------
4    * Copyright (c) MuleSource, Inc.  All rights reserved.  http://www.mulesource.com
5    *
6    * The software in this package is published under the terms of the CPAL v1.0
7    * license, a copy of which has been included with this distribution in the
8    * LICENSE.txt file.
9    */
10  
11  package org.mule.providers.jbi.components;
12  
13  import org.mule.umo.transformer.TransformerException;
14  import org.mule.umo.transformer.UMOTransformer;
15  
16  import javax.jbi.messaging.InOnly;
17  import javax.jbi.messaging.InOut;
18  import javax.jbi.messaging.MessageExchange;
19  import javax.jbi.messaging.MessagingException;
20  import javax.jbi.messaging.NormalizedMessage;
21  import javax.xml.transform.Source;
22  
23  /**
24   * Mule transformers can be reused in side a Jbi container
25   * 
26   * @author <a href="mailto:ross.mason@symphonysoft.com">Ross Mason</a>
27   * @version $Revision: 7976 $
28   */
29  public class TransformerComponent extends AbstractJbiComponent
30  {
31  
32      protected UMOTransformer transformer = null;
33  
34      public void onMessage(MessageExchange messageExchange, NormalizedMessage message)
35          throws MessagingException
36      {
37          if (messageExchange.getRole() == MessageExchange.Role.PROVIDER)
38          {
39              return;
40          }
41          NormalizedMessage in = messageExchange.getMessage("in");
42  
43          try
44          {
45              NormalizedMessage out = messageExchange.createMessage();
46              transform(messageExchange, in, out);
47  
48              if (messageExchange instanceof InOut)
49              {
50                  messageExchange.setMessage(out, OUT);
51              }
52              else
53              {
54                  InOnly outExchange = exchangeFactory.createInOnlyExchange();
55                  outExchange.setInMessage(out);
56                  deliveryChannel.sendSync(outExchange);
57              }
58              done(messageExchange);
59          }
60          catch (Exception e)
61          {
62              error(messageExchange, e);
63          }
64      }
65  
66      protected void transform(MessageExchange exchange, NormalizedMessage in, NormalizedMessage out)
67          throws TransformerException, MessagingException
68      {
69          Object result = transformer.transform(in.getContent());
70          if (result instanceof Source)
71          {
72              out.setContent((Source)result);
73          }
74          else
75          {
76              throw new UnsupportedOperationException(
77                  "Support for Source transformation is not yet implemented");
78          }
79      }
80  }