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1   /*
2    * $Id: TransformerTemplate.java 20321 2010-11-24 15:21:24Z dfeist $
3    * --------------------------------------------------------------------------------------
4    * Copyright (c) MuleSoft, Inc.  All rights reserved.  http://www.mulesoft.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  package org.mule.transformer;
11  
12  import org.mule.api.MuleMessage;
13  import org.mule.api.transformer.TransformerException;
14  
15  /** TODO */
16  public class TransformerTemplate extends AbstractMessageTransformer
17  {
18      private TransformerCallback callback;
19  
20      public TransformerTemplate(TransformerCallback callback)
21      {
22          this.callback = callback;
23      }
24  
25      @Override
26      public Object transformMessage(MuleMessage message, String outputEncoding) throws TransformerException
27      {
28          try
29          {
30              return callback.doTransform(message);
31          }
32          catch (TransformerException e)
33          {
34              throw new TransformerException(e.getI18nMessage(),this, e);
35          }
36          catch (Exception e)
37          {
38              throw new TransformerException(this, e);
39          }
40      }
41  
42      public interface TransformerCallback
43      {
44          public Object doTransform(MuleMessage message) throws Exception;
45      }
46  
47      public static class OverwitePayloadCallback implements TransformerCallback
48      {
49          private Object payload;
50  
51          public OverwitePayloadCallback(Object payload)
52          {
53              this.payload = payload;
54          }
55  
56          public Object doTransform(MuleMessage message) throws Exception
57          {
58              return payload;
59          }
60      }
61  }