ImportExport.java revision 11822:110f7f35760f 
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 * @key randomness
30 */
31
32import java.nio.*;
33import java.util.*;
34
35public class ImportExport {
36    final Random rnd = new Random();
37
38    void equal(byte[] x, byte[] y) {
39        check(Arrays.equals(x, y));
40    }
41
42    void equal(long[] x, long[] y) {
43        check(Arrays.equals(x, y));
44    }
45
46    void equal(byte[] bytes, BitSet s) {
47        equal(s, BitSet.valueOf(bytes));
48        equal(s, BitSet.valueOf(ByteBuffer.wrap(bytes)));
49        equal(s, BitSet.valueOf(
50                  ByteBuffer.wrap(
51                      Arrays.copyOf(bytes, bytes.length + 8 + rnd.nextInt(8)))
52                  .order(ByteOrder.LITTLE_ENDIAN)
53                  .asLongBuffer()));
54    }
55
56    void checkEmptyBitSet(BitSet s) {
57        equal(s.toByteArray(), new byte[0]);
58        equal(s.toLongArray(), new long[0]);
59        check(s.isEmpty());
60    }
61
62    void test(String[] args) throws Throwable {
63        for (int i = 0; i < 17; i++) {
64            byte[] bytes = new byte[i];
65            BitSet s = new BitSet();
66            equal(bytes, s);
67            equal(BitSet.valueOf(bytes).toByteArray(), new byte[0]);
68            if (i > 0) {
69                int k = rnd.nextInt(i);
70                for (int j = 0; j < 8; j++) {
71                    bytes[k] |= 1 << j;
72                    s.set(8*k+j);
73                    equal(bytes, s);
74                    byte[] expected = new byte[k+1]; expected[k] = bytes[k];
75                    equal(BitSet.valueOf(bytes).toByteArray(), expected);
76                    ByteBuffer bb = ByteBuffer.wrap(bytes);
77                    bb.position(k);
78                    equal(BitSet.valueOf(bb).toByteArray(),
79                          new byte[]{bytes[k]});
80                }
81            }
82        }
83        for (int i = 0; i < 100; i++) {
84            byte[] bytes = new byte[rnd.nextInt(17)];
85            for (int j = 0; j < bytes.length; j++)
86                bytes[j] = (byte) rnd.nextInt(0x100);
87            BitSet s = BitSet.valueOf(bytes);
88            byte[] expected = s.toByteArray();
89            equal(expected.length, (s.length()+7)/8);
90            if (bytes.length == 0)
91                continue;
92            if (expected.length > 0)
93                check(expected[expected.length-1] != 0);
94            if (bytes[bytes.length-1] != 0)
95                equal(bytes, expected);
96            int n = rnd.nextInt(8 * bytes.length);
97            equal(s.get(n), ((bytes[n/8] & (1<<(n%8))) != 0));
98        }
99
100        for (int i = 0; i < 3; i++) {
101            checkEmptyBitSet(BitSet.valueOf(new byte[i]));
102            checkEmptyBitSet(BitSet.valueOf(ByteBuffer.wrap(new byte[i])));
103            checkEmptyBitSet(BitSet.valueOf(new byte[i*64]));
104            checkEmptyBitSet(BitSet.valueOf(ByteBuffer.wrap(new byte[i*64])));
105            checkEmptyBitSet(BitSet.valueOf(new long[i]));
106            checkEmptyBitSet(BitSet.valueOf(LongBuffer.wrap(new long[i])));
107        }
108
109        {
110            long[] longs = new long[rnd.nextInt(10)];
111            for (int i = 0; i < longs.length; i++)
112                longs[i] = rnd.nextLong();
113            LongBuffer b1 = LongBuffer.wrap(longs);
114            LongBuffer b2 = LongBuffer.allocate(longs.length + 10);
115            for (int i = 0; i < b2.limit(); i++)
116                b2.put(i, rnd.nextLong());
117            int beg = rnd.nextInt(10);
118            b2.position(beg);
119            b2.put(longs);
120            b2.limit(b2.position());
121            b2.position(beg);
122            BitSet s1 = BitSet.valueOf(longs);
123            BitSet s2 = BitSet.valueOf(b1);
124            BitSet s3 = BitSet.valueOf(b2);
125            equal(s1, s2);
126            equal(s1, s3);
127            if (longs.length > 0 && longs[longs.length -1] != 0) {
128                equal(longs, s1.toLongArray());
129                equal(longs, s2.toLongArray());
130                equal(longs, s3.toLongArray());
131            }
132            for (int i = 0; i < 64 * longs.length; i++) {
133                equal(s1.get(i), ((longs [i/64] & (1L<<(i%64))) != 0));
134                equal(s2.get(i), ((b1.get(i/64) & (1L<<(i%64))) != 0));
135                equal(s3.get(i), ((b2.get(b2.position()+i/64) & (1L<<(i%64))) != 0));
136            }
137        }
138    }
139
140    //--------------------- Infrastructure ---------------------------
141    volatile int passed = 0, failed = 0;
142    void pass() {passed++;}
143    void fail() {failed++; Thread.dumpStack();}
144    void fail(String msg) {System.err.println(msg); fail();}
145    void unexpected(Throwable t) {failed++; t.printStackTrace();}
146    void check(boolean cond) {if (cond) pass(); else fail();}
147    void equal(Object x, Object y) {
148        if (x == null ? y == null : x.equals(y)) pass();
149        else fail(x + " not equal to " + y);}
150    public static void main(String[] args) throws Throwable {
151        new ImportExport().instanceMain(args);}
152    void instanceMain(String[] args) throws Throwable {
153        try {test(args);} catch (Throwable t) {unexpected(t);}
154        System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed);
155        if (failed > 0) throw new AssertionError("Some tests failed");}
156}
157