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1   /*
2    * Copyright (c) MuleSoft, Inc.  All rights reserved.  http://www.mulesoft.com
3    * The software in this package is published under the terms of the CPAL v1.0
4    * license, a copy of which has been included with this distribution in the
5    * LICENSE.txt file.
6    */
7   package org.mule.module.atom.transformers;
8   
9   import org.mule.api.transformer.TransformerException;
10  import org.mule.transformer.AbstractDiscoverableTransformer;
11  import org.mule.transformer.types.DataTypeFactory;
12  
13  import java.io.ByteArrayInputStream;
14  import java.io.InputStream;
15  import java.io.StringReader;
16  
17  import org.apache.abdera.Abdera;
18  import org.apache.abdera.model.Document;
19  import org.apache.abdera.model.Element;
20  import org.apache.abdera.model.Feed;
21  import org.apache.abdera.parser.Parser;
22  
23  /**
24   * <code>ObjectToInputStream</code> converts serilaizable object to a input stream but
25   * treats <code>java.lang.String</code> differently by converting to bytes using
26   * the <code>String.getBytes()</code> method.
27   */
28  public class ObjectToFeed extends AbstractDiscoverableTransformer
29  {
30      public ObjectToFeed()
31      {
32          this.registerSourceType(DataTypeFactory.BYTE_ARRAY);
33          this.registerSourceType(DataTypeFactory.INPUT_STREAM);
34          this.registerSourceType(DataTypeFactory.STRING);
35          setReturnDataType(DataTypeFactory.create(Feed.class));
36      }
37  
38      @Override
39      public Object doTransform(Object src, String outputEncoding) throws TransformerException
40      {
41          try
42          {
43              Parser parser = Abdera.getInstance().getParser();
44              Document<Element> doc;
45              if (src instanceof InputStream)
46              {
47                  doc = parser.parse((InputStream) src, outputEncoding);
48              }
49              else if (src instanceof byte[])
50              {
51                  doc = parser.parse(new ByteArrayInputStream((byte[]) src), outputEncoding);
52              }
53              else
54              {
55                  doc = parser.parse(new StringReader((String) src));
56              }
57              
58              //we only need to check for the registered source types
59              return doc.getRoot();
60          }
61          catch (Exception e)
62          {
63              throw new TransformerException(this, e);
64          }
65      }
66  }