DriverStream


1   /**
2    * Sequoia: Database clustering technology.
3    * Copyright (C) 2002-2004 French National Institute For Research In Computer
4    * Science And Control (INRIA).
5    * Copyright (C) 2005 AmicoSoft, Inc. dba Emic Networks
6    * Contact: sequoia@continuent.org
7    * 
8    * Licensed under the Apache License, Version 2.0 (the "License");
9    * you may not use this file except in compliance with the License.
10   * You may obtain a copy of the License at
11   * 
12   * http://www.apache.org/licenses/LICENSE-2.0
13   * 
14   * Unless required by applicable law or agreed to in writing, software
15   * distributed under the License is distributed on an "AS IS" BASIS,
16   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
17   * See the License for the specific language governing permissions and
18   * limitations under the License. 
19   *
20   * Initial developer(s): Nicolas Modrzyk
21   * Contributor(s): Emmanuel Cecchet.
22   */
23  
24  package org.continuent.sequoia.common.stream;
25  
26  import java.io.ByteArrayOutputStream  ;
27  import java.io.IOException  ;
28  import java.io.ObjectOutputStream  ;
29  import java.nio.charset.Charset  ;
30  
31  /**
32   * This is a useful stream class to compress and decompress object to a stream.
33   * 
34   * @author <a HREF="mailto:Nicolas.Modrzyk@inrialpes.fr">Nicolas Modrzyk </a>
35   * @author <a HREF="mailto:Emmanuel.Cecchet@inria.fr">Emmanuel Cecchet </a>
36   */
37  public class DriverStream
38  {
39  
40    /** @see DriverBufferedOutputStream#writeLongUTF(String) */
41    static final int        STRING_CHUNK_SIZE = 64000/3;
42  
43    static final Charset   UTF8Codec = Charset.forName("UTF-8");
44  
45    /**
46     * Statistic method to count the number of bytes of a class.
47     * 
48     * @param obj to count bytes
49     * @return the number of bytes
50     * @throws IOException if fails to read
51     */
52    public static final int countBytes(Object   obj) throws IOException  
53    {
54      ByteArrayOutputStream   bos = new ByteArrayOutputStream  ();
55      ObjectOutputStream   oos = new ObjectOutputStream  (bos);
56      oos.writeObject(obj);
57      oos.flush();
58      oos.close();
59      bos.close();
60      return bos.size();
61    }
62  
63  }
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