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1   /*
2    * $Id: XmlToObject.java 11336 2008-03-12 17:53:18Z 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.module.xml.transformer;
12  
13  import org.mule.api.MuleMessage;
14  import org.mule.api.transformer.TransformerException;
15  
16  import java.io.ByteArrayInputStream;
17  import java.io.IOException;
18  import java.io.InputStream;
19  import java.io.InputStreamReader;
20  import java.io.Reader;
21  import java.io.UnsupportedEncodingException;
22  
23  /**
24   * <code>XmlToObject</code> converts xml created by the ObjectToXml transformer in to a
25   * java object graph. This transformer uses XStream. Xstream uses some clever tricks so
26   * objects that get marshalled to XML do not need to implement any interfaces including
27   * Serializable and you don't even need to specify a default constructor.
28   *
29   * @see org.mule.transformer.xml.ObjectToXml
30   */
31  
32  public class XmlToObject extends AbstractXStreamTransformer
33  {
34  
35      private final DomDocumentToXml domTransformer = new DomDocumentToXml();
36  
37      public XmlToObject()
38      {
39          registerSourceType(String.class);
40          registerSourceType(byte[].class);
41          registerSourceType(InputStream.class);
42          registerSourceType(org.w3c.dom.Document.class);
43          registerSourceType(org.dom4j.Document.class);
44          setReturnClass(Object.class);
45      }
46  
47      public Object transform(MuleMessage message, String outputEncoding) throws TransformerException
48      {
49          Object src = message.getPayload();
50          if (src instanceof byte[])
51          {
52              try
53              {
54                  Reader xml = new InputStreamReader(new ByteArrayInputStream((byte[]) src), outputEncoding);
55                  return getXStream().fromXML(xml);
56              }
57              catch (UnsupportedEncodingException uee)
58              {
59                  throw new TransformerException(this, uee);
60              }
61          }
62          else if(src instanceof InputStream)
63          {
64              InputStream input = (InputStream) src;
65              try
66              {
67                  Reader xml = new InputStreamReader(input, outputEncoding);
68                  return getXStream().fromXML(xml);
69              }
70              catch (UnsupportedEncodingException uee)
71              {
72                  throw new TransformerException(this, uee);
73              }
74              finally
75              {
76                  try
77                  {
78                      input.close();
79                  }
80                  catch (IOException e)
81                  {
82                      logger.warn("Exception closing stream: ", e);
83                  }
84              }
85          }
86          else if (src instanceof String)
87          {
88              return getXStream().fromXML(src.toString());
89          }
90          else
91          {
92              return getXStream().fromXML((String) domTransformer.transform(src));
93          }
94      }
95  
96  }