util/Hashtable/ReadObject.java

/*
 * Copyright 2003 Sun Microsystems, Inc.  All Rights Reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
 * CA 95054 USA or visit www.sun.com if you need additional information or
 * have any questions.
 */

/**
 * @test
 * @bug 4652911
 * @summary test Hashtable readObject for invocation of overridable put method
 */
import java.util.Hashtable;

import java.io.ByteArrayOutputStream;
import java.io.ObjectOutputStream;
import java.io.ByteArrayInputStream;
import java.io.ObjectInputStream;
import java.io.Serializable;

/**
 * Class that extends Hashtable to demonstrate bug when
 * subclass wraps the values put into the Hashtable.
 */
public class ReadObject extends Hashtable {
    /**
     * Wraps the values put into MyHashtable objects
     */
    class ValueWrapper implements Serializable {
        private Object mValue;

        ValueWrapper(Object value) {
            mValue = value;
        }

        Object getValue() {
            return mValue;
        }
    };

    public Object get(Object key) {
        ValueWrapper valueWrapper = (ValueWrapper)super.get(key);
        Object value = valueWrapper.getValue();
        if(value instanceof ValueWrapper)
            throw new RuntimeException("Hashtable.get bug");
        return value;
    }

    public Object put(Object key, Object value) {
        if(value instanceof ValueWrapper)
            throw new RuntimeException(
                "Hashtable.put bug: value is already wrapped");
        ValueWrapper valueWrapper = new ValueWrapper(value);
        super.put(key, valueWrapper);
        return value;
    }

    private static Object copyObject(Object oldObj) {
        Object newObj = null;
        try {
           //Create a stream in which to serialize the object.
            ByteArrayOutputStream ostream = new ByteArrayOutputStream();
            ObjectOutputStream p = new ObjectOutputStream(ostream);
            //Serialize the object into the stream
            p.writeObject(oldObj);

            //Create an input stream from which to deserialize the object
            byte[] byteArray = ostream.toByteArray();
            ByteArrayInputStream istream = new ByteArrayInputStream(byteArray);
            ObjectInputStream q = new ObjectInputStream(istream);
            //Deserialize the object
            newObj = q.readObject();
        } catch (Exception ex) {
            ex.printStackTrace();
        }
        return newObj;
    }

    public static void main(String[] args) {
        ReadObject myHashtable = new ReadObject();
        myHashtable.put("key", "value");
        ReadObject myHashtableCopy = (ReadObject)copyObject(myHashtable);
        String value = (String)myHashtableCopy.get("key");
    }
};
Revision:	1.1
Committed:	Tue Sep 1 01:25:04 2009 UTC (14 years, 9 months ago) by jsr166
Branch:	MAIN
Log Message:	import tests from openjdk
#	User	Rev	Content
1	jsr166	1.1	/*
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			};