1 /*
2  * Copyright (c) 2005, 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 6325535
27  * @summary Test for the rounding behavior of negate(MathContext)
28  * @author Joseph D. Darcy
29  */
30 
31 import java.math.*;
32 
33 public class NegateTests {
34 
negateThenRound(BigDecimal bd, MathContext mc)35     static BigDecimal negateThenRound(BigDecimal bd, MathContext mc) {
36         return bd.negate().plus(mc);
37     }
38 
39 
absThenRound(BigDecimal bd, MathContext mc)40     static BigDecimal absThenRound(BigDecimal bd, MathContext mc) {
41         return bd.abs().plus(mc);
42     }
43 
44 
negateTest(BigDecimal[][] testCases, MathContext mc)45     static int negateTest(BigDecimal[][] testCases,  MathContext mc) {
46         int failures = 0;
47 
48         for (BigDecimal [] testCase : testCases) {
49 
50             BigDecimal bd = testCase[0];
51             BigDecimal neg1 = bd.negate(mc);
52             BigDecimal neg2 = negateThenRound(bd, mc);
53             BigDecimal expected = testCase[1];
54 
55             if (! neg1.equals(expected) ) {
56                 failures++;
57                 System.err.println("(" + bd + ").negate(" + mc + ") => " +
58                                    neg1 + " != expected " + expected);
59             }
60 
61             if (! neg1.equals(neg2) ) {
62                 failures++;
63                 System.err.println("(" + bd + ").negate(" + mc + ")  => " +
64                                    neg1 + " != ntr " + neg2);
65             }
66 
67             // Test abs consistency
68             BigDecimal abs = bd.abs(mc);
69             BigDecimal expectedAbs = absThenRound(bd,mc);
70             if (! abs.equals(expectedAbs) ) {
71                 failures++;
72                 System.err.println("(" + bd + ").abs(" + mc + ")  => " +
73                                    abs + " != atr " +  expectedAbs);
74             }
75 
76         }
77 
78         return failures;
79     }
80 
negateTests()81     static int negateTests() {
82         int failures = 0;
83         BigDecimal [][] testCasesCeiling = {
84             {new BigDecimal("1.3"),     new BigDecimal("-1")},
85             {new BigDecimal("-1.3"),    new BigDecimal("2")},
86         };
87 
88         failures += negateTest(testCasesCeiling,
89                                new MathContext(1, RoundingMode.CEILING));
90 
91         BigDecimal [][] testCasesFloor = {
92             {new BigDecimal("1.3"),     new BigDecimal("-2")},
93             {new BigDecimal("-1.3"),    new BigDecimal("1")},
94         };
95 
96         failures += negateTest(testCasesFloor,
97                                new MathContext(1, RoundingMode.FLOOR));
98 
99         return failures;
100     }
101 
main(String argv[])102     public static void main(String argv[]) {
103         int failures = 0;
104 
105         failures += negateTests();
106 
107         if (failures > 0 )
108             throw new RuntimeException("Incurred " + failures + " failures" +
109                                        " testing the negate and/or abs.");
110     }
111 }
112