SerializationTester


1   /*
2    * @(#)SerializationTester.java 1.5 03/12/19
3    *
4    * Copyright 2004 Sun Microsystems, Inc. All rights reserved.
5    * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
6    */
7   
8   package java.awt.dnd;
9   
10  import java.io.OutputStream  ;
11  import java.io.ObjectOutputStream  ;
12  import java.io.IOException  ;
13  import java.io.Serializable  ;
14  
15  /**
16   * Tests if an object can truly be serialized by serializing it to a null
17   * OutputStream.
18   *
19   * @version 1.5, 12/19/03
20   * @since 1.4
21   */
22  final class SerializationTester {
23      private static ObjectOutputStream   stream;
24      static {
25          try {
26              stream = new ObjectOutputStream  (new OutputStream  () {
27                      public void write(int b) {}
28                  });
29          } catch (IOException   cannotHappen) {
30          }
31      }
32  
33      static boolean test(Object   obj) {
34          if (!(obj instanceof Serializable  )) {
35              return false;
36          }
37  
38          try {
39              stream.writeObject(obj);
40          } catch (IOException   e) {
41              return false;
42          } finally {
43              // Fix for 4503661. 
44              // Reset the stream so that it doesn't keep a reference to the
45              // written object.
46              try {
47                  stream.reset();
48              } catch (IOException   e) {
49                  // Ignore the exception.
50              }
51          }
52          return true;
53      }
54  
55      private SerializationTester() {}
56  }
57
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