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1   /*
2    * $Id: XmlToObject.java 19250 2010-08-30 16:53:14Z dirk.olmes $
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.module.xml.transformer;
12  
13  import org.mule.api.MuleMessage;
14  import org.mule.api.transformer.TransformerException;
15  import org.mule.transformer.types.DataTypeFactory;
16  import org.mule.util.store.DeserializationPostInitialisable;
17  
18  import java.io.ByteArrayInputStream;
19  import java.io.IOException;
20  import java.io.InputStream;
21  import java.io.InputStreamReader;
22  import java.io.Reader;
23  import java.io.UnsupportedEncodingException;
24  
25  /**
26   * <code>XmlToObject</code> converts xml created by the ObjectToXml transformer in to a
27   * java object graph. This transformer uses XStream. Xstream uses some clever tricks so
28   * objects that get marshalled to XML do not need to implement any interfaces including
29   * Serializable and you don't even need to specify a default constructor.
30   *
31   * @see ObjectToXml
32   */
33  
34  public class XmlToObject extends AbstractXStreamTransformer
35  {
36  
37      private final DomDocumentToXml domTransformer = new DomDocumentToXml();
38  
39      public XmlToObject()
40      {
41          registerSourceType(DataTypeFactory.STRING);
42          registerSourceType(DataTypeFactory.BYTE_ARRAY);
43          registerSourceType(DataTypeFactory.INPUT_STREAM);
44          registerSourceType(DataTypeFactory.create(org.w3c.dom.Document.class));
45          registerSourceType(DataTypeFactory.create(org.dom4j.Document.class));
46          setReturnDataType(DataTypeFactory.OBJECT);
47      }
48  
49      @Override
50      public Object transformMessage(MuleMessage message, String outputEncoding) throws TransformerException
51      {
52          Object src = message.getPayload();
53          Object result;
54          if (src instanceof byte[])
55          {
56              try
57              {
58                  Reader xml = new InputStreamReader(new ByteArrayInputStream((byte[]) src), outputEncoding);
59                  result = getXStream().fromXML(xml);
60              }
61              catch (UnsupportedEncodingException e)
62              {
63                  throw new TransformerException(this, e);
64              }
65          }
66          else if (src instanceof InputStream)
67          {
68              InputStream input = (InputStream) src;
69              try
70              {
71                  Reader xml = new InputStreamReader(input, outputEncoding);
72                  result = getXStream().fromXML(xml);
73              }
74              catch (Exception e)
75              {
76                  throw new TransformerException(this, e);
77              }
78              finally
79              {
80                  try
81                  {
82                      input.close();
83                  }
84                  catch (IOException e)
85                  {
86                      logger.warn("Exception closing stream: ", e);
87                  }
88              }
89          }
90          else if (src instanceof String)
91          {
92              result = getXStream().fromXML(src.toString());
93          }
94          else
95          {
96              result = getXStream().fromXML((String) domTransformer.transform(src));
97          }
98  
99          try
100         {
101             postDeserialisationInit(result);
102             return result;
103         }
104         catch (Exception e)
105         {
106             throw new TransformerException(this, e);
107         }
108     }
109 
110     protected void postDeserialisationInit(final Object object) throws Exception
111     {
112         if (object instanceof DeserializationPostInitialisable)
113         {
114             DeserializationPostInitialisable.Implementation.init(object, muleContext);
115         }
116     }
117 
118 }