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1   /*
2    * $Id: ObjectToFeed.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.atom.transformers;
12  
13  import org.mule.api.transformer.TransformerException;
14  import org.mule.transformer.AbstractDiscoverableTransformer;
15  import org.mule.transformer.types.DataTypeFactory;
16  
17  import java.io.ByteArrayInputStream;
18  import java.io.InputStream;
19  import java.io.StringReader;
20  
21  import org.apache.abdera.Abdera;
22  import org.apache.abdera.model.Document;
23  import org.apache.abdera.model.Element;
24  import org.apache.abdera.model.Feed;
25  import org.apache.abdera.parser.Parser;
26  
27  /**
28   * <code>ObjectToInputStream</code> converts serilaizable object to a input stream but
29   * treats <code>java.lang.String</code> differently by converting to bytes using
30   * the <code>String.getBytes()</code> method.
31   */
32  public class ObjectToFeed extends AbstractDiscoverableTransformer
33  {
34      public ObjectToFeed()
35      {
36          this.registerSourceType(DataTypeFactory.BYTE_ARRAY);
37          this.registerSourceType(DataTypeFactory.INPUT_STREAM);
38          this.registerSourceType(DataTypeFactory.STRING);
39          setReturnDataType(DataTypeFactory.create(Feed.class));
40      }
41  
42      @Override
43      public Object doTransform(Object src, String outputEncoding) throws TransformerException
44      {
45          try
46          {
47              Parser parser = Abdera.getInstance().getParser();
48              Document<Element> doc;
49              if (src instanceof InputStream)
50              {
51                  doc = parser.parse((InputStream) src, outputEncoding);
52              }
53              else if (src instanceof byte[])
54              {
55                  doc = parser.parse(new ByteArrayInputStream((byte[]) src), outputEncoding);
56              }
57              else
58              {
59                  doc = parser.parse(new StringReader((String) src));
60              }
61              
62              //we only need to check for the registered source types
63              return doc.getRoot();
64          }
65          catch (Exception e)
66          {
67              throw new TransformerException(this, e);
68          }
69      }
70  }