rev 5431 : 7126277: Alternative hashing implementation

   1 /*
   2  * Copyright (c) 2010, 2011, 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  * Portions Copyright (c) 2010, 2011 IBM Corporation
  26  */
  27 
  28 /*
  29  * @test
  30  * @bug 6927486
  31  * @summary A serialized Hashtable can be de-serialized properly.
  32  * @author Neil Richards <neil.richards@ngmr.net>, <neil_richards@uk.ibm.com>
  33  */
  34 
  35 import java.io.ByteArrayInputStream;
  36 import java.io.ByteArrayOutputStream;

  37 import java.io.ObjectInputStream;
  38 import java.io.ObjectOutputStream;
  39 import java.io.PrintWriter;
  40 import java.io.StringWriter;
  41 import java.util.Hashtable;
  42 import java.util.Map;
  43 
  44 public class SimpleSerialization {
  45     public static void main(final String[] args) throws Exception {
  46         Hashtable<String, String> h1 = new Hashtable<>();
  47 
  48         System.err.println("*** BEGIN TEST ***");
  49 
  50         h1.put("key", "value");
  51 
  52         final ByteArrayOutputStream baos = new ByteArrayOutputStream();
  53         try (ObjectOutputStream oos = new ObjectOutputStream(baos)) {

  54             oos.writeObject(h1);
  55         }
  56 
  57         final byte[] data = baos.toByteArray();
  58         final ByteArrayInputStream bais = new ByteArrayInputStream(data);
  59         final Object deserializedObject;
  60         try (ObjectInputStream ois = new ObjectInputStream(bais)) {
  61             deserializedObject = ois.readObject();
  62         }
  63 
  64         if(!h1.getClass().isInstance(deserializedObject)) {
  65              throw new RuntimeException("Result not assignable to type of h1");
  66         }
  67 
  68         if (false == h1.equals(deserializedObject)) {
  69              Hashtable<String, String> d1 = (Hashtable<String, String>) h1;
  70             for(Map.Entry entry: h1.entrySet()) {
  71                 System.err.println("h1.key::" + entry.getKey() + " d1.containsKey()::" + d1.containsKey((String) entry.getKey()));
  72                 System.err.println("h1.value::" + entry.getValue() + " d1.contains()::" + d1.contains(entry.getValue()));
  73                 System.err.println("h1.value == d1.value " + entry.getValue().equals(d1.get((String) entry.getKey())));
  74             }
  75 
  76             throw new RuntimeException(getFailureText(h1, deserializedObject));
  77         }
  78     }
  79 
  80     private static String getFailureText(final Object orig, final Object copy) {
  81         final StringWriter sw = new StringWriter();
  82         try (PrintWriter pw = new PrintWriter(sw)) {

  83             pw.println("Test FAILED: Deserialized object is not equal to the original object");
  84             pw.print("\tOriginal: ");
  85             printObject(pw, orig).println();
  86             pw.print("\tCopy:     ");
  87             printObject(pw, copy).println();
  88         }

  89         return sw.toString();
  90     }
  91 
  92     private static PrintWriter printObject(final PrintWriter pw, final Object o) {
  93         pw.printf("%s@%08x", o.getClass().getName(), System.identityHashCode(o));
  94         return pw;
  95     }
  96 }
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