MarshallUtil


1   /*
2    * JBoss, the OpenSource J2EE webOS
3    *
4    * Distributable under LGPL license.
5    * See terms of license at gnu.org.
6    */
7   
8   package org.jboss.cache.marshall;
9   
10  import org.jboss.util.stream.MarshalledValueInputStream;
11  import org.jboss.util.stream.MarshalledValueOutputStream;
12  
13  import java.io.ByteArrayInputStream  ;
14  import java.io.ByteArrayOutputStream  ;
15  import java.io.InputStream  ;
16  
17  /**
18   * Utility methods related to marshalling and unmarshalling objects.
19   *
20   * @author <a HREF="mailto://brian.stansberry@jboss.com">Brian Stansberry</a>
21   * @version $Revision$
22   */
23  public class MarshallUtil
24  {
25  
26      /**
27       * Creates an object from a byte buffer using
28       * {@link MarshalledValueInputStream}.
29       *
30       * @param bytes serialized form of an object
31       * @return the object, or <code>null</code> if <code>bytes</code>
32       *         is <code>null</code>
33       */
34      public static Object   objectFromByteBuffer(byte[] bytes) throws Exception  
35      {
36          if (bytes == null)
37          {
38              return null;
39          }
40  
41          ByteArrayInputStream   bais = new ByteArrayInputStream  (bytes);
42          MarshalledValueInputStream input = new MarshalledValueInputStream(bais);
43          Object   result = input.readObject();
44          input.close();
45          return result;
46      }
47  
48      /**
49       * Creates an object from a byte buffer using
50       * {@link MarshalledValueInputStream}.
51       *
52       * @param bytes serialized form of an object
53       * @return the object, or <code>null</code> if <code>bytes</code>
54       *         is <code>null</code>
55       */
56      public static Object   objectFromByteBuffer(InputStream bytes) throws Exception  
57      {
58          if (bytes == null)
59          {
60              return null;
61          }
62  
63          MarshalledValueInputStream input = new MarshalledValueInputStream(bytes);
64          Object   result = input.readObject();
65          input.close();
66          return result;
67      }
68  
69      /**
70       * Serializes an object into a byte buffer using
71       * {@link org.jboss.util.stream.MarshalledValueOutputStream}.
72       *
73       * @param obj an object that implements Serializable or Externalizable
74       * @return serialized form of the object
75       */
76      public static byte[] objectToByteBuffer(Object   obj) throws Exception  
77      {
78          ByteArrayOutputStream   baos = new ByteArrayOutputStream  ();
79          MarshalledValueOutputStream out = new MarshalledValueOutputStream(baos);
80          out.writeObject(obj);
81          out.close();
82          return baos.toByteArray();
83      }
84  
85  }
86
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