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1   /*
2    * $Id: NullResultTestCase.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  
11  package org.mule.transformer;
12  
13  import org.mule.api.transformer.Transformer;
14  import org.mule.api.transformer.TransformerException;
15  import org.mule.transformer.types.DataTypeFactory;
16  import org.mule.transport.NullPayload;
17  
18  public class NullResultTestCase extends AbstractTransformerTestCase
19  {
20      private final NullResultTransformer transformer = new NullResultTransformer();
21  
22      @Override
23      public Object getTestData()
24      {
25          return new Object();
26      }
27  
28      @Override
29      public Object getResultData()
30      {
31          return NullPayload.getInstance();
32      }
33  
34      @Override
35      public Transformer getTransformer() throws Exception
36      {
37          return transformer;
38      }
39  
40      @Override
41      public Transformer getRoundTripTransformer() throws Exception
42      {
43          return null;
44      }
45  
46      public void testNullNotExpected() throws Exception
47      {
48          transformer.setReturnDataType(DataTypeFactory.STRING);
49          try
50          {
51              testTransform();
52              fail("Transformer should have thrown an exception because the return class doesn't match the result.");
53          }
54          catch (TransformerException e)
55          {
56              // expected
57          }
58      }
59  
60      public static final class NullResultTransformer extends AbstractTransformer
61      {
62          public NullResultTransformer()
63          {
64              super();
65              this.registerSourceType(DataTypeFactory.OBJECT);
66              this.setReturnDataType(DataTypeFactory.create(NullPayload.class));
67          }
68  
69          @Override
70          public Object doTransform(Object src, String encoding) throws TransformerException
71          {
72              return null;
73          }
74      }
75  }