ObjectZipper


1   /*
2    * Lucane - a collaborative platform
3    * Copyright (C) 2004  Gilles Viguie <gilles.viguie@free.fr>
4    *
5    * This library is free software; you can redistribute it and/or
6    * modify it under the terms of the GNU Lesser General Public
7    * License as published by the Free Software Foundation; either
8    * version 2.1 of the License, or (at your option) any later version.
9    *
10   * This library is distributed in the hope that it will be useful,
11   * but WITHOUT ANY WARRANTY; without even the implied warranty of
12   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13   * Lesser General Public License for more details.
14   *
15   * You should have received a copy of the GNU Lesser General Public
16   * License along with this library; if not, write to the Free Software
17   * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
18   */
19  package org.lucane.common.net;
20  
21  import java.io.IOException  ;
22  import java.io.Serializable  ;
23  import java.io.ByteArrayInputStream  ;
24  import java.io.ObjectInputStream  ;
25  import java.io.ByteArrayOutputStream  ;
26  import java.io.ObjectOutputStream  ;
27  import java.util.zip.GZIPInputStream  ;
28  import java.util.zip.GZIPOutputStream  ;
29  
30  /**
31   * Convert objets to GZipped bytes
32   */
33  public class ObjectZipper 
34  {
35      /**
36       * Zip object to bytes
37       * @param object the object to zip
38       * @return the byte array
39       */
40      public static byte[] objectToBytes(Serializable   object) 
41      throws IOException  
42      {
43          ByteArrayOutputStream   bo = new ByteArrayOutputStream  ();     
44          GZIPOutputStream   go = new GZIPOutputStream  (bo);
45          ObjectOutputStream   oo = new ObjectOutputStream  (go);
46          
47          oo.writeObject(object);
48          oo.flush();
49          go.finish();
50          
51          return bo.toByteArray();
52      }    
53      
54      /**
55       * Unzip bytes to object
56       * @param bytes the zipped bytes
57       * @return the object
58       */
59      public static Serializable   bytesToObject(byte[] bytes)
60      throws IOException  , ClassNotFoundException   
61      {
62          ByteArrayInputStream   bi = new ByteArrayInputStream  (bytes);
63          GZIPInputStream   gi = new GZIPInputStream  (bi);
64          ObjectInputStream   oi = new LucaneObjectInputStream(gi);
65          
66          return (Serializable  )oi.readObject();
67      }
68  }
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