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 }