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/* |
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* Copyright (c) 2003, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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|
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/* |
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* @test |
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* @bug 4652911 |
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* @summary test Hashtable readObject for invocation of overridable put method |
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*/ |
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|
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import java.io.ByteArrayInputStream; |
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import java.io.ByteArrayOutputStream; |
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import java.io.ObjectInputStream; |
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import java.io.ObjectOutputStream; |
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import java.io.Serializable; |
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import java.util.Hashtable; |
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|
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/** |
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* Class that extends Hashtable to demonstrate bug when |
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* subclass wraps the values put into the Hashtable. |
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*/ |
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public class ReadObject extends Hashtable { |
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/** |
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* Wraps the values put into MyHashtable objects |
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*/ |
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class ValueWrapper implements Serializable { |
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private Object mValue; |
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|
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ValueWrapper(Object value) { |
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mValue = value; |
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} |
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|
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Object getValue() { |
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return mValue; |
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} |
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} |
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|
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public Object get(Object key) { |
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ValueWrapper valueWrapper = (ValueWrapper)super.get(key); |
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Object value = valueWrapper.getValue(); |
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if (value instanceof ValueWrapper) |
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throw new RuntimeException("Hashtable.get bug"); |
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return value; |
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} |
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|
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public Object put(Object key, Object value) { |
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if (value instanceof ValueWrapper) |
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throw new RuntimeException( |
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"Hashtable.put bug: value is already wrapped"); |
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ValueWrapper valueWrapper = new ValueWrapper(value); |
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super.put(key, valueWrapper); |
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return value; |
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} |
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|
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private static Object copyObject(Object oldObj) { |
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Object newObj = null; |
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try { |
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//Create a stream in which to serialize the object. |
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ByteArrayOutputStream ostream = new ByteArrayOutputStream(); |
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ObjectOutputStream p = new ObjectOutputStream(ostream); |
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//Serialize the object into the stream |
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p.writeObject(oldObj); |
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|
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//Create an input stream from which to deserialize the object |
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byte[] byteArray = ostream.toByteArray(); |
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ByteArrayInputStream istream = new ByteArrayInputStream(byteArray); |
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ObjectInputStream q = new ObjectInputStream(istream); |
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//Deserialize the object |
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newObj = q.readObject(); |
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} catch (Exception ex) { |
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ex.printStackTrace(); |
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} |
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return newObj; |
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} |
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|
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public static void main(String[] args) { |
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ReadObject myHashtable = new ReadObject(); |
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myHashtable.put("key", "value"); |
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ReadObject myHashtableCopy = (ReadObject)copyObject(myHashtable); |
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String value = (String)myHashtableCopy.get("key"); |
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} |
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} |
