1 /*
   2  * Copyright (c) 2013, 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 import java.io.ByteArrayInputStream;
  25 import java.io.ByteArrayOutputStream;
  26 import java.io.IOException;
  27 import java.io.ObjectInputStream;
  28 import java.io.ObjectOutputStream;
  29 import java.util.HashSet;
  30 import java.util.Random;
  31 import java.util.concurrent.ThreadLocalRandom;
  32 
  33 /*
  34  * @test
  35  * @bug 8016252
  36  * @summary Verify that a serialized HashSet may successfully be deserialized.

  37  */
  38 public class Serialization {
  39 
  40     private static final int NUM_SETS = 43;
  41     private static final int MAX_CAPACITY = 257;
  42     private static final float MAX_LOAD_FACTOR = 100.0F;
  43 
  44     private static final Random rnd = ThreadLocalRandom.current();
  45 
  46     private static HashSet<Integer> createHashSet() {
  47         int capacity = rnd.nextInt(MAX_CAPACITY);
  48         float loadFactor = Float.MIN_VALUE + rnd.nextFloat()*MAX_LOAD_FACTOR;
  49         HashSet<Integer> hashSet = new HashSet<Integer>(capacity, loadFactor);
  50         float multiplier = 2*rnd.nextFloat(); // range [0,2]
  51         int size = (int)(capacity*loadFactor*multiplier);
  52         for (int i = 0; i < size; i++) {
  53             hashSet.add(rnd.nextInt());
  54         }
  55         return hashSet;
  56     }
  57 
  58     private static HashSet<Integer> serDeser(HashSet<Integer> hashSet) throws IOException, ClassNotFoundException {
  59         ByteArrayOutputStream baos = new ByteArrayOutputStream();
  60         ObjectOutputStream oos = new ObjectOutputStream(baos);
  61         oos.writeObject(hashSet);
  62         oos.flush();
  63 
  64         ByteArrayInputStream bais = new ByteArrayInputStream(baos.toByteArray());
  65         ObjectInputStream ois = new ObjectInputStream(bais);
  66         HashSet<Integer> result = (HashSet<Integer>)ois.readObject();
  67 
  68         oos.close();
  69         ois.close();
  70 
  71         return result;
  72     }
  73 
  74     private static void printHashSet(HashSet<Integer> hashSet) {
  75         System.err.println("Size: "+hashSet.size());
  76         for (Object o : hashSet) {
  77             System.err.println(o);
  78         }
  79     }
  80 
  81     public static void main(String[] args) {
  82         int failures = 0;
  83 
  84         for (int i = 0; i < NUM_SETS; i++) {
  85             HashSet<Integer> hashSet = createHashSet();
  86 
  87             HashSet<Integer> result = null;
  88             try {
  89                 result = serDeser(hashSet);
  90             } catch (IOException ioe) {
  91                 System.err.println(ioe);
  92                 failures++;
  93             } catch (ClassNotFoundException cnfe) {
  94                 System.err.println(cnfe);
  95                 failures++;
  96             }
  97 
  98             if (!hashSet.equals(result)) {
  99                 System.err.println("Unequal HashSets!");
 100                 printHashSet(hashSet);
 101                 System.err.println();
 102                 failures++;
 103             }
 104         }
 105 
 106         if (failures != 0) {
 107             throw new RuntimeException("HashSet/Serialzation failed with "+
 108                     failures+" failures!");
 109         }
 110     }
 111 }
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