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8289260: BigDecimal movePointLeft() and movePointRight() do not follow their API spec

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Reviewed-by: darcy
This commit is contained in:
Raffaello Giulietti 2022-07-06 16:22:18 +00:00 committed by Joe Darcy
parent 9f37ba44b8
commit 35387d5cb6
2 changed files with 108 additions and 2 deletions
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4
src/java.base/share/classes/java/math/BigDecimal.java
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@ -2993,7 +2993,7 @@ public class BigDecimal extends Number implements Comparable<BigDecimal> {
* @throws ArithmeticException if scale overflows.
*/
public BigDecimal movePointLeft(int n) {
if (n == 0) return this;
if (n == 0 && scale >= 0) return this;
// Cannot use movePointRight(-n) in case of n==Integer.MIN_VALUE
int newScale = checkScale((long)scale + n);
@ -3017,7 +3017,7 @@ public class BigDecimal extends Number implements Comparable<BigDecimal> {
* @throws ArithmeticException if scale overflows.
*/
public BigDecimal movePointRight(int n) {
if (n == 0) return this;
if (n == 0 && scale >= 0) return this;
// Cannot use movePointLeft(-n) in case of n==Integer.MIN_VALUE
int newScale = checkScale((long)scale - n);

106
test/jdk/java/math/BigDecimal/MovePointTests.java Normal file
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@ -0,0 +1,106 @@
/*
* Copyright (c) 2022, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/*
* @test
* @bug 8289260
*/
import java.math.BigDecimal;
public class MovePointTests {
public static void main(String argv[]) {
BigDecimal bd;
bd = BigDecimal.valueOf(1, -3);
checkNotIdentical(bd, bd.movePointLeft(0));
checkNotIdentical(bd, bd.movePointRight(0));
bd = BigDecimal.valueOf(1, 0);
checkIdentical(bd, bd.movePointLeft(0));
checkIdentical(bd, bd.movePointRight(0));
bd = BigDecimal.valueOf(1, 3);
checkIdentical(bd, bd.movePointLeft(0));
checkIdentical(bd, bd.movePointRight(0));
bd = BigDecimal.valueOf(1, -3);
checkNotEquals(bd, bd.movePointLeft(1));
checkNotEquals(bd, bd.movePointLeft(-1));
checkNotEquals(bd, bd.movePointRight(1));
checkNotEquals(bd, bd.movePointRight(-1));
bd = BigDecimal.valueOf(1, 0);
checkNotEquals(bd, bd.movePointLeft(1));
checkNotEquals(bd, bd.movePointLeft(-1));
checkNotEquals(bd, bd.movePointRight(1));
checkNotEquals(bd, bd.movePointRight(-1));
bd = BigDecimal.valueOf(1, 3);
checkNotEquals(bd, bd.movePointLeft(1));
checkNotEquals(bd, bd.movePointLeft(-1));
checkNotEquals(bd, bd.movePointRight(1));
checkNotEquals(bd, bd.movePointRight(-1));
bd = BigDecimal.valueOf(1, -3);
checkNotEquals(bd, bd.movePointLeft(10));
checkNotEquals(bd, bd.movePointLeft(-10));
checkNotEquals(bd, bd.movePointRight(10));
checkNotEquals(bd, bd.movePointRight(-10));
bd = BigDecimal.valueOf(1, 0);
checkNotEquals(bd, bd.movePointLeft(10));
checkNotEquals(bd, bd.movePointLeft(-10));
checkNotEquals(bd, bd.movePointRight(10));
checkNotEquals(bd, bd.movePointRight(-10));
bd = BigDecimal.valueOf(1, 3);
checkNotEquals(bd, bd.movePointLeft(10));
checkNotEquals(bd, bd.movePointLeft(-10));
checkNotEquals(bd, bd.movePointRight(10));
checkNotEquals(bd, bd.movePointRight(-10));
}
private static void checkIdentical(BigDecimal bd, BigDecimal res) {
if (res != bd) { // intentionally !=
throw new RuntimeException("Unexpected result " +
bd + " != " + res);
}
}
private static void checkNotIdentical(BigDecimal bd, BigDecimal res) {
if (res == bd) { // intentionally ==
throw new RuntimeException("Unexpected result " +
bd + " == " + res);
}
}
private static void checkNotEquals(BigDecimal bd, BigDecimal res) {
if (res.equals(bd)) {
throw new RuntimeException("Unexpected result " +
bd + ".equals(" + res + ")");
}
}
}