01 /*
02 * Copyright 2001 Sun Microsystems, Inc. All Rights Reserved.
03 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
04 *
05 * This code is free software; you can redistribute it and/or modify it
06 * under the terms of the GNU General Public License version 2 only, as
07 * published by the Free Software Foundation. Sun designates this
08 * particular file as subject to the "Classpath" exception as provided
09 * by Sun in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
22 * CA 95054 USA or visit www.sun.com if you need additional information or
23 * have any questions.
24 */
25
26 package java.awt.dnd;
27
28 import java.io.OutputStream;
29 import java.io.ObjectOutputStream;
30 import java.io.IOException;
31 import java.io.Serializable;
32
33 /**
34 * Tests if an object can truly be serialized by serializing it to a null
35 * OutputStream.
36 *
37 * @version 1.12, 05/05/07
38 * @since 1.4
39 */
40 final class SerializationTester {
41 private static ObjectOutputStream stream;
42 static {
43 try {
44 stream = new ObjectOutputStream(new OutputStream() {
45 public void write(int b) {
46 }
47 });
48 } catch (IOException cannotHappen) {
49 }
50 }
51
52 static boolean test(Object obj) {
53 if (!(obj instanceof Serializable)) {
54 return false;
55 }
56
57 try {
58 stream.writeObject(obj);
59 } catch (IOException e) {
60 return false;
61 } finally {
62 // Fix for 4503661.
63 // Reset the stream so that it doesn't keep a reference to the
64 // written object.
65 try {
66 stream.reset();
67 } catch (IOException e) {
68 // Ignore the exception.
69 }
70 }
71 return true;
72 }
73
74 private SerializationTester() {
75 }
76 }
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