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1   /*
2    * $Id: GZipUncompressTransformer.java 12326 2008-07-14 01:25:32Z rossmason $
3    * --------------------------------------------------------------------------------------
4    * Copyright (c) MuleSource, Inc.  All rights reserved.  http://www.mulesource.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.transformer.compression;
12  
13  import org.mule.api.transformer.TransformerException;
14  import org.mule.config.i18n.MessageFactory;
15  import org.mule.util.IOUtils;
16  import org.mule.util.compression.GZipCompression;
17  
18  import java.io.IOException;
19  import java.io.InputStream;
20  
21  import org.apache.commons.lang.SerializationUtils;
22  
23  /**
24   * <code>GZipCompressTransformer</code> will uncompress a byte[] or InputStream
25   */
26  public class GZipUncompressTransformer extends AbstractCompressionTransformer
27  {
28  
29      public GZipUncompressTransformer()
30      {
31          super();
32          this.setStrategy(new GZipCompression());
33          this.registerSourceType(byte[].class);
34          this.registerSourceType(InputStream.class);
35          this.setReturnClass(byte[].class);
36      }
37  
38      // @Override
39      public Object doTransform(Object src, String encoding) throws TransformerException
40      {
41          byte[] buffer;
42  
43          try
44          {
45              byte[] input = null;
46              if (src instanceof InputStream)
47              {
48                  InputStream inputStream = (InputStream) src;
49                  try
50                  {
51                      input = IOUtils.toByteArray(inputStream);
52                  }
53                  finally
54                  {
55                      inputStream.close();
56                  }
57              }
58              else
59              {
60                  input = (byte[]) src;
61              }
62  
63              buffer = getStrategy().uncompressByteArray(input);
64          }
65          catch (IOException e)
66          {
67              throw new TransformerException(
68                      MessageFactory.createStaticMessage("Failed to uncompress message."), this, e);
69          }
70  
71          if (!getReturnClass().equals(byte[].class))
72          {
73              return SerializationUtils.deserialize(buffer);
74          }
75  
76          return buffer;
77      }
78  
79  }