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/*
* Copyright (c) 2023, 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 8159023
* @summary Confirm behavior of mantissa for scientific notation in Decimal Format
* @run junit MantissaDigits
*/
import java.text.DecimalFormat;
import java.text.DecimalFormatSymbols;
import java.util.Locale;
import java.util.stream.Stream;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.params.ParameterizedTest;
import org.junit.jupiter.params.provider.Arguments;
import org.junit.jupiter.params.provider.MethodSource;
import static org.junit.jupiter.api.Assertions.assertEquals;
public class MantissaDigits {
private static final double[] NUMBERS = {
1.1, 12.1, 123.1, 1234.1, 12345.1, 123456.1,
-1.1, -12.1, -123.1, -1234.1, -12345.1, -123456.1,
1, 12, 123, 1234, 12345, 123456, 1234567,
-1, -12, -123, -1234, -12345, -123456, -1234567,
1.1234, 1.1111, 1.412, 222.333, -771.2222
};
private static final DecimalFormatSymbols DFS = new DecimalFormatSymbols(Locale.US);
private static final String ERRMSG = "%s formatted with %s gives %s, and " +
"significant digit count was %s, but the formula provided %s%n";
// Hard coded as 1, since all test patterns only have 1 exponent digit
private static final int EXPONENTDIGITS = 1;
@ParameterizedTest
@MethodSource("patterns")
public void testMantissaDefinition(String pattern, int minDigits, int maxDigits) {
DecimalFormat df = new DecimalFormat(pattern, DFS);
for (double number : NUMBERS) {
// Count the significant digits in the pre-formatted number
int originalNumDigits = (int) String.valueOf(number).chars()
.filter(Character::isDigit).count();
if (wholeNumber(number)) {
// Trailing 0 should not be counted
originalNumDigits--;
}
// Format the number, then grab the significant
// digits inside the mantissa
String formattedNum = df.format(number);
int mantissaDigits = (int) formattedNum.chars()
.filter(Character::isDigit).count() - EXPONENTDIGITS;
// Test the new definition of the Mantissa
Integer calculatedDigits = Math
.min(Math.max(minDigits, originalNumDigits), maxDigits);
assertEquals(mantissaDigits, calculatedDigits, String.format(ERRMSG,
number, pattern, formattedNum, mantissaDigits, calculatedDigits));
}
}
private static Boolean wholeNumber(double number) {
return (int) number == number;
}
private static Stream<Arguments> patterns() {
return Stream.of(
Arguments.of("#0.0##E0", 2, 5),
Arguments.of("#00.00##E0", 4, 7),
Arguments.of("#0.000##E0", 4, 7),
Arguments.of("#00.000##E0", 5, 8),
Arguments.of("#000.0##E0", 4, 7),
Arguments.of("#000.00##E0", 5, 8),
Arguments.of("#000.000##E0", 6, 9),
Arguments.of("000.000E0", 6, 6),
Arguments.of("#.##E0", 0, 3),
Arguments.of("######.######E0", 0, 12),
Arguments.of("####00.00######E0", 4, 14)
);
}
}
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