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1   /*
2    * $Id: GZipUncompressTransformer.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.transformer.compression;
12  
13  import org.mule.api.transformer.TransformerException;
14  import org.mule.config.i18n.MessageFactory;
15  import org.mule.transformer.types.DataTypeFactory;
16  import org.mule.util.IOUtils;
17  import org.mule.util.compression.GZipCompression;
18  
19  import java.io.IOException;
20  import java.io.InputStream;
21  
22  import org.apache.commons.lang.SerializationUtils;
23  
24  /**
25   * <code>GZipCompressTransformer</code> will uncompress a byte[] or InputStream
26   */
27  public class GZipUncompressTransformer extends AbstractCompressionTransformer
28  {
29      public GZipUncompressTransformer()
30      {
31          super();
32          this.setStrategy(new GZipCompression());
33          this.registerSourceType(DataTypeFactory.BYTE_ARRAY);
34          this.registerSourceType(DataTypeFactory.INPUT_STREAM);
35          this.setReturnDataType(DataTypeFactory.BYTE_ARRAY);
36      }
37  
38      @Override
39      public Object doTransform(Object src, String outputEncoding) 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 (!DataTypeFactory.BYTE_ARRAY.equals(getReturnDataType()))
72          {
73              return SerializationUtils.deserialize(buffer);
74          }
75  
76          return buffer;
77      }
78  }