104 lines
4.2 KiB
Java
104 lines
4.2 KiB
Java
/*
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* Copyright (c) 2023, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* @test
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* @bug 8159023
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* @summary Confirm behavior of mantissa for scientific notation in Decimal Format
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* @run junit MantissaDigits
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*/
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import java.text.DecimalFormat;
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import java.text.DecimalFormatSymbols;
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import java.util.Locale;
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import java.util.stream.Stream;
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import org.junit.jupiter.api.Test;
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import org.junit.jupiter.params.ParameterizedTest;
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import org.junit.jupiter.params.provider.Arguments;
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import org.junit.jupiter.params.provider.MethodSource;
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import static org.junit.jupiter.api.Assertions.assertEquals;
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public class MantissaDigits {
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private static final double[] NUMBERS = {
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1.1, 12.1, 123.1, 1234.1, 12345.1, 123456.1,
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-1.1, -12.1, -123.1, -1234.1, -12345.1, -123456.1,
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1, 12, 123, 1234, 12345, 123456, 1234567,
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-1, -12, -123, -1234, -12345, -123456, -1234567,
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1.1234, 1.1111, 1.412, 222.333, -771.2222
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};
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private static final DecimalFormatSymbols DFS = new DecimalFormatSymbols(Locale.US);
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private static final String ERRMSG = "%s formatted with %s gives %s, and " +
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"significant digit count was %s, but the formula provided %s%n";
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// Hard coded as 1, since all test patterns only have 1 exponent digit
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private static final int EXPONENTDIGITS = 1;
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@ParameterizedTest
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@MethodSource("patterns")
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public void testMantissaDefinition(String pattern, int minDigits, int maxDigits) {
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DecimalFormat df = new DecimalFormat(pattern, DFS);
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for (double number : NUMBERS) {
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// Count the significant digits in the pre-formatted number
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int originalNumDigits = (int) String.valueOf(number).chars()
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.filter(Character::isDigit).count();
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if (wholeNumber(number)) {
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// Trailing 0 should not be counted
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originalNumDigits--;
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}
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// Format the number, then grab the significant
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// digits inside the mantissa
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String formattedNum = df.format(number);
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int mantissaDigits = (int) formattedNum.chars()
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.filter(Character::isDigit).count() - EXPONENTDIGITS;
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// Test the new definition of the Mantissa
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Integer calculatedDigits = Math
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.min(Math.max(minDigits, originalNumDigits), maxDigits);
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assertEquals(mantissaDigits, calculatedDigits, String.format(ERRMSG,
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number, pattern, formattedNum, mantissaDigits, calculatedDigits));
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}
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}
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private static Boolean wholeNumber(double number) {
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return (int) number == number;
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}
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private static Stream<Arguments> patterns() {
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return Stream.of(
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Arguments.of("#0.0##E0", 2, 5),
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Arguments.of("#00.00##E0", 4, 7),
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Arguments.of("#0.000##E0", 4, 7),
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Arguments.of("#00.000##E0", 5, 8),
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Arguments.of("#000.0##E0", 4, 7),
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Arguments.of("#000.00##E0", 5, 8),
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Arguments.of("#000.000##E0", 6, 9),
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Arguments.of("000.000E0", 6, 6),
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Arguments.of("#.##E0", 0, 3),
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Arguments.of("######.######E0", 0, 12),
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Arguments.of("####00.00######E0", 4, 14)
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);
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}
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}
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