J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2003 Sun Microsystems, Inc. All Rights Reserved. |
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 | * |
| 5 | * This code is free software; you can redistribute it and/or modify it |
| 6 | * under the terms of the GNU General Public License version 2 only, as |
| 7 | * published by the Free Software Foundation. |
| 8 | * |
| 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 12 | * version 2 for more details (a copy is included in the LICENSE file that |
| 13 | * accompanied this code). |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License version |
| 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
| 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| 18 | * |
| 19 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 20 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 21 | * have any questions. |
| 22 | */ |
| 23 | |
| 24 | /** |
| 25 | * @test |
| 26 | * @bug 4652911 |
| 27 | * @summary test Hashtable readObject for invocation of overridable put method |
| 28 | */ |
| 29 | import java.util.Hashtable; |
| 30 | |
| 31 | import java.io.ByteArrayOutputStream; |
| 32 | import java.io.ObjectOutputStream; |
| 33 | import java.io.ByteArrayInputStream; |
| 34 | import java.io.ObjectInputStream; |
| 35 | import java.io.Serializable; |
| 36 | |
| 37 | /** |
| 38 | * Class that extends Hashtable to demonstrate bug when |
| 39 | * subclass wraps the values put into the Hashtable. |
| 40 | */ |
| 41 | public class ReadObject extends Hashtable { |
| 42 | /** |
| 43 | * Wraps the values put into MyHashtable objects |
| 44 | */ |
| 45 | class ValueWrapper implements Serializable { |
| 46 | private Object mValue; |
| 47 | |
| 48 | ValueWrapper(Object value) { |
| 49 | mValue = value; |
| 50 | } |
| 51 | |
| 52 | Object getValue() { |
| 53 | return mValue; |
| 54 | } |
| 55 | }; |
| 56 | |
| 57 | public Object get(Object key) { |
| 58 | ValueWrapper valueWrapper = (ValueWrapper)super.get(key); |
| 59 | Object value = valueWrapper.getValue(); |
| 60 | if(value instanceof ValueWrapper) |
| 61 | throw new RuntimeException("Hashtable.get bug"); |
| 62 | return value; |
| 63 | } |
| 64 | |
| 65 | public Object put(Object key, Object value) { |
| 66 | if(value instanceof ValueWrapper) |
| 67 | throw new RuntimeException( |
| 68 | "Hashtable.put bug: value is already wrapped"); |
| 69 | ValueWrapper valueWrapper = new ValueWrapper(value); |
| 70 | super.put(key, valueWrapper); |
| 71 | return value; |
| 72 | } |
| 73 | |
| 74 | private static Object copyObject(Object oldObj) { |
| 75 | Object newObj = null; |
| 76 | try { |
| 77 | //Create a stream in which to serialize the object. |
| 78 | ByteArrayOutputStream ostream = new ByteArrayOutputStream(); |
| 79 | ObjectOutputStream p = new ObjectOutputStream(ostream); |
| 80 | //Serialize the object into the stream |
| 81 | p.writeObject(oldObj); |
| 82 | |
| 83 | //Create an input stream from which to deserialize the object |
| 84 | byte[] byteArray = ostream.toByteArray(); |
| 85 | ByteArrayInputStream istream = new ByteArrayInputStream(byteArray); |
| 86 | ObjectInputStream q = new ObjectInputStream(istream); |
| 87 | //Deserialize the object |
| 88 | newObj = q.readObject(); |
| 89 | } catch (Exception ex) { |
| 90 | ex.printStackTrace(); |
| 91 | } |
| 92 | return newObj; |
| 93 | } |
| 94 | |
| 95 | public static void main(String[] args) { |
| 96 | ReadObject myHashtable = new ReadObject(); |
| 97 | myHashtable.put("key", "value"); |
| 98 | ReadObject myHashtableCopy = (ReadObject)copyObject(myHashtable); |
| 99 | String value = (String)myHashtableCopy.get("key"); |
| 100 | } |
| 101 | }; |