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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.rss.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 com.sun.syndication.feed.synd.SyndFeed;
14  import com.sun.syndication.io.SyndFeedInput;
15  import com.sun.syndication.io.XmlReader;
16  
17  import java.io.ByteArrayInputStream;
18  import java.io.File;
19  import java.io.InputStream;
20  import java.io.StringReader;
21  
22  import org.w3c.dom.Document;
23  import org.xml.sax.InputSource;
24  
25  /**
26   * Converts an RSS data representation into a SyndFeed object
27   */
28  public class ObjectToRssFeed extends AbstractDiscoverableTransformer
29  {
30      public ObjectToRssFeed()
31      {
32          registerSourceType(DataTypeFactory.BYTE_ARRAY);
33          registerSourceType(DataTypeFactory.STRING);
34          registerSourceType(DataTypeFactory.INPUT_STREAM);
35          registerSourceType(DataTypeFactory.create(Document.class));
36          registerSourceType(DataTypeFactory.create(InputSource.class));
37          registerSourceType(DataTypeFactory.create(File.class));
38          setReturnDataType(DataTypeFactory.create(SyndFeed.class));
39      }
40  
41      @Override
42      protected Object doTransform(Object src, String outputEncoding) throws TransformerException
43      {
44          SyndFeedInput feedInput = new SyndFeedInput();
45          SyndFeed feed = null;
46          try
47          {
48              if (src instanceof String)
49              {
50                  feed = feedInput.build(new StringReader(src.toString()));
51  
52              }
53              else if (src instanceof InputStream)
54              {
55                  feed = feedInput.build(new XmlReader((InputStream) src));
56  
57              }
58              else if (src instanceof byte[])
59              {
60                  feed = feedInput.build(new XmlReader(new ByteArrayInputStream((byte[]) src)));
61  
62              }
63              else if (src instanceof Document)
64              {
65                  feed = feedInput.build((Document) src);
66  
67              }
68              else if (src instanceof InputSource)
69              {
70                  feed = feedInput.build((InputSource) src);
71  
72              }
73              else if (src instanceof File)
74              {
75                  feed = feedInput.build((File) src);
76  
77              }
78              return feed;
79          }
80          catch (Exception e)
81          {
82              throw new TransformerException(this, e);
83          }
84      }
85  }