1 /*
   2  * Copyright (c) 2007, 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  * @test
  26  * @bug 5037068
  27  * @summary Test import/export constructors and methods
  28  * @author Martin Buchholz
  29  */
  30 
  31 import java.nio.*;
  32 import java.util.*;
  33 
  34 public class ImportExport {
  35     final Random rnd = new Random();
  36 
  37     void equal(byte[] x, byte[] y) {
  38         check(Arrays.equals(x, y));
  39     }
  40 
  41     void equal(long[] x, long[] y) {
  42         check(Arrays.equals(x, y));
  43     }
  44 
  45     void equal(byte[] bytes, BitSet s) {
  46         equal(s, BitSet.valueOf(bytes));
  47         equal(s, BitSet.valueOf(ByteBuffer.wrap(bytes)));
  48         equal(s, BitSet.valueOf(
  49                   ByteBuffer.wrap(
  50                       Arrays.copyOf(bytes, bytes.length + 8 + rnd.nextInt(8)))
  51                   .order(ByteOrder.LITTLE_ENDIAN)
  52                   .asLongBuffer()));
  53     }
  54 
  55     void checkEmptyBitSet(BitSet s) {
  56         equal(s.toByteArray(), new byte[0]);
  57         equal(s.toLongArray(), new long[0]);
  58         check(s.isEmpty());
  59     }
  60 
  61     void test(String[] args) throws Throwable {
  62         for (int i = 0; i < 17; i++) {
  63             byte[] bytes = new byte[i];
  64             BitSet s = new BitSet();
  65             equal(bytes, s);
  66             equal(BitSet.valueOf(bytes).toByteArray(), new byte[0]);
  67             if (i > 0) {
  68                 int k = rnd.nextInt(i);
  69                 for (int j = 0; j < 8; j++) {
  70                     bytes[k] |= 1 << j;
  71                     s.set(8*k+j);
  72                     equal(bytes, s);
  73                     byte[] expected = new byte[k+1]; expected[k] = bytes[k];
  74                     equal(BitSet.valueOf(bytes).toByteArray(), expected);
  75                     ByteBuffer bb = ByteBuffer.wrap(bytes);
  76                     bb.position(k);
  77                     equal(BitSet.valueOf(bb).toByteArray(),
  78                           new byte[]{bytes[k]});
  79                 }
  80             }
  81         }
  82         for (int i = 0; i < 100; i++) {
  83             byte[] bytes = new byte[rnd.nextInt(17)];
  84             for (int j = 0; j < bytes.length; j++)
  85                 bytes[j] = (byte) rnd.nextInt(0x100);
  86             BitSet s = BitSet.valueOf(bytes);
  87             byte[] expected = s.toByteArray();
  88             equal(expected.length, (s.length()+7)/8);
  89             if (bytes.length == 0)
  90                 continue;
  91             if (expected.length > 0)
  92                 check(expected[expected.length-1] != 0);
  93             if (bytes[bytes.length-1] != 0)
  94                 equal(bytes, expected);
  95             int n = rnd.nextInt(8 * bytes.length);
  96             equal(s.get(n), ((bytes[n/8] & (1<<(n%8))) != 0));
  97         }
  98 
  99         for (int i = 0; i < 3; i++) {
 100             checkEmptyBitSet(BitSet.valueOf(new byte[i]));
 101             checkEmptyBitSet(BitSet.valueOf(ByteBuffer.wrap(new byte[i])));
 102             checkEmptyBitSet(BitSet.valueOf(new byte[i*64]));
 103             checkEmptyBitSet(BitSet.valueOf(ByteBuffer.wrap(new byte[i*64])));
 104             checkEmptyBitSet(BitSet.valueOf(new long[i]));
 105             checkEmptyBitSet(BitSet.valueOf(LongBuffer.wrap(new long[i])));
 106         }
 107 
 108         {
 109             long[] longs = new long[rnd.nextInt(10)];
 110             for (int i = 0; i < longs.length; i++)
 111                 longs[i] = rnd.nextLong();
 112             LongBuffer b1 = LongBuffer.wrap(longs);
 113             LongBuffer b2 = LongBuffer.allocate(longs.length + 10);
 114             for (int i = 0; i < b2.limit(); i++)
 115                 b2.put(i, rnd.nextLong());
 116             int beg = rnd.nextInt(10);
 117             b2.position(beg);
 118             b2.put(longs);
 119             b2.limit(b2.position());
 120             b2.position(beg);
 121             BitSet s1 = BitSet.valueOf(longs);
 122             BitSet s2 = BitSet.valueOf(b1);
 123             BitSet s3 = BitSet.valueOf(b2);
 124             equal(s1, s2);
 125             equal(s1, s3);
 126             if (longs.length > 0 && longs[longs.length -1] != 0) {
 127                 equal(longs, s1.toLongArray());
 128                 equal(longs, s2.toLongArray());
 129                 equal(longs, s3.toLongArray());
 130             }
 131             for (int i = 0; i < 64 * longs.length; i++) {
 132                 equal(s1.get(i), ((longs [i/64] & (1L<<(i%64))) != 0));
 133                 equal(s2.get(i), ((b1.get(i/64) & (1L<<(i%64))) != 0));
 134                 equal(s3.get(i), ((b2.get(b2.position()+i/64) & (1L<<(i%64))) != 0));
 135             }
 136         }
 137     }
 138 
 139     //--------------------- Infrastructure ---------------------------
 140     volatile int passed = 0, failed = 0;
 141     void pass() {passed++;}
 142     void fail() {failed++; Thread.dumpStack();}
 143     void fail(String msg) {System.err.println(msg); fail();}
 144     void unexpected(Throwable t) {failed++; t.printStackTrace();}
 145     void check(boolean cond) {if (cond) pass(); else fail();}
 146     void equal(Object x, Object y) {
 147         if (x == null ? y == null : x.equals(y)) pass();
 148         else fail(x + " not equal to " + y);}
 149     public static void main(String[] args) throws Throwable {
 150         new ImportExport().instanceMain(args);}
 151     void instanceMain(String[] args) throws Throwable {
 152         try {test(args);} catch (Throwable t) {unexpected(t);}
 153         System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed);
 154         if (failed > 0) throw new AssertionError("Some tests failed");}
 155 }