View Javadoc

1   /*
2    * $Id: GZipCompressTransformer.java 21584 2011-03-18 12:17:31Z tcarlson $
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.transformer.types.DataTypeFactory;
15  import org.mule.util.IOUtils;
16  import org.mule.util.SerializationUtils;
17  import org.mule.util.compression.GZipCompression;
18  
19  import java.io.IOException;
20  import java.io.InputStream;
21  import java.io.Serializable;
22  
23  /**
24   * <code>GZipCompressTransformer</code> is a transformer compressing objects into
25   * byte arrays.
26   */
27  public class GZipCompressTransformer extends AbstractCompressionTransformer
28  {
29      public GZipCompressTransformer()
30      {
31          super();
32          this.setStrategy(new GZipCompression());
33          this.registerSourceType(DataTypeFactory.create(Serializable.class));
34          this.registerSourceType(DataTypeFactory.BYTE_ARRAY);
35          this.registerSourceType(DataTypeFactory.INPUT_STREAM);
36          this.setReturnDataType(DataTypeFactory.BYTE_ARRAY);
37      }
38  
39      @Override
40      public Object doTransform(Object src, String outputEncoding) throws TransformerException
41      {
42          try
43          {
44              byte[] data = null;
45              if (src instanceof byte[])
46              {
47                  data = (byte[]) src;
48              }
49              else if (src instanceof InputStream)
50              {
51                  InputStream input = (InputStream)src;
52                  try
53                  {
54                      data = IOUtils.toByteArray(input);
55                  }
56                  finally
57                  {
58                      input.close();
59                  }
60              }
61              else
62              {
63                  data = SerializationUtils.serialize((Serializable) src);
64              }
65              return this.getStrategy().compressByteArray(data);
66          }
67          catch (IOException ioex)
68          {
69              throw new TransformerException(this, ioex);
70          }
71      }
72  }