View Javadoc

1   /*
2    * $Id: TransformerCollection.java 10489 2008-01-23 17:53:38Z dfeist $
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  package org.mule.transformer;
11  
12  import org.mule.api.MuleMessage;
13  import org.mule.api.transformer.Transformer;
14  import org.mule.api.transformer.TransformerException;
15  
16  import java.util.Arrays;
17  import java.util.Iterator;
18  import java.util.List;
19  
20  /** TODO */
21  public class TransformerCollection extends AbstractMessageAwareTransformer
22  {
23      private List transformers;
24  
25      public TransformerCollection(List transformers)
26      {
27          if (transformers.size() < 1)
28          {
29              throw new IllegalArgumentException("You must set at least one transformer");
30          }
31          this.transformers = transformers;
32      }
33  
34      public TransformerCollection(Transformer[] transformers)
35      {
36          if (transformers.length < 1)
37          {
38              throw new IllegalArgumentException("You must set at least one transformer");
39          }
40          this.transformers = Arrays.asList(transformers);
41      }
42  
43      public Object transform(MuleMessage message, String outputEncoding) throws TransformerException
44      {
45          MuleMessage result = message;
46          Object temp = message;
47          Transformer lastTransformer = null;
48          for (Iterator iterator = transformers.iterator(); iterator.hasNext();)
49          {
50              lastTransformer = (Transformer) iterator.next();
51              temp = lastTransformer.transform(temp);
52              if (temp instanceof MuleMessage)
53              {
54                  result = (MuleMessage) temp;
55              }
56              else
57              {
58                  result.setPayload(temp);
59              }
60          }
61          if (lastTransformer != null && lastTransformer.getReturnClass().equals(MuleMessage.class))
62          {
63              return result;
64          }
65          else
66          {
67              return result.getPayload();
68          }
69      }
70  }