1/*
2 * Copyright (c) 2003, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24/**
25 * @test
26 * @bug 4652911
27 * @summary test Hashtable readObject for invocation of overridable put method
28 */
29import java.util.Hashtable;
30
31import java.io.ByteArrayOutputStream;
32import java.io.ObjectOutputStream;
33import java.io.ByteArrayInputStream;
34import java.io.ObjectInputStream;
35import java.io.Serializable;
36
37/**
38 * Class that extends Hashtable to demonstrate bug when
39 * subclass wraps the values put into the Hashtable.
40 */
41public 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}
102