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1   /*
2    * $Id: ObjectToRssFeed.java 20321 2010-11-24 15:21:24Z dfeist $
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  package org.mule.module.rss.transformers;
11  
12  import org.mule.api.transformer.TransformerException;
13  import org.mule.transformer.AbstractDiscoverableTransformer;
14  import org.mule.transformer.types.DataTypeFactory;
15  
16  import com.sun.syndication.feed.synd.SyndFeed;
17  import com.sun.syndication.io.SyndFeedInput;
18  import com.sun.syndication.io.XmlReader;
19  
20  import java.io.ByteArrayInputStream;
21  import java.io.File;
22  import java.io.InputStream;
23  import java.io.StringReader;
24  
25  import org.w3c.dom.Document;
26  import org.xml.sax.InputSource;
27  
28  /**
29   * Converts an RSS data representation into a SyndFeed object
30   */
31  public class ObjectToRssFeed extends AbstractDiscoverableTransformer
32  {
33      public ObjectToRssFeed()
34      {
35          registerSourceType(DataTypeFactory.BYTE_ARRAY);
36          registerSourceType(DataTypeFactory.STRING);
37          registerSourceType(DataTypeFactory.INPUT_STREAM);
38          registerSourceType(DataTypeFactory.create(Document.class));
39          registerSourceType(DataTypeFactory.create(InputSource.class));
40          registerSourceType(DataTypeFactory.create(File.class));
41          setReturnDataType(DataTypeFactory.create(SyndFeed.class));
42      }
43  
44      @Override
45      protected Object doTransform(Object src, String outputEncoding) throws TransformerException
46      {
47          SyndFeedInput feedInput = new SyndFeedInput();
48          SyndFeed feed = null;
49          try
50          {
51              if (src instanceof String)
52              {
53                  feed = feedInput.build(new StringReader(src.toString()));
54  
55              }
56              else if (src instanceof InputStream)
57              {
58                  feed = feedInput.build(new XmlReader((InputStream) src));
59  
60              }
61              else if (src instanceof byte[])
62              {
63                  feed = feedInput.build(new XmlReader(new ByteArrayInputStream((byte[]) src)));
64  
65              }
66              else if (src instanceof Document)
67              {
68                  feed = feedInput.build((Document) src);
69  
70              }
71              else if (src instanceof InputSource)
72              {
73                  feed = feedInput.build((InputSource) src);
74  
75              }
76              else if (src instanceof File)
77              {
78                  feed = feedInput.build((File) src);
79  
80              }
81              return feed;
82          }
83          catch (Exception e)
84          {
85              throw new TransformerException(this, e);
86          }
87      }
88  }