231 lines
8.4 KiB
Java
231 lines
8.4 KiB
Java
/*
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* Copyright (c) 1997, 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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* @summary round trip test NumberFormat
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* @key randomness
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* @run junit NumberRoundTrip
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*/
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import java.text.DecimalFormat;
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import java.text.NumberFormat;
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import java.text.ParseException;
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import java.util.Locale;
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import org.junit.jupiter.api.Test;
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import static org.junit.jupiter.api.Assertions.fail;
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/**
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* This class tests the round-trip behavior of NumberFormat, DecimalFormat, and DigitList.
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* Round-trip behavior is tested by taking a numeric value and formatting it, then
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* parsing the resulting string, and comparing this result with the original value.
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* Two tests are applied: String preservation, and numeric preservation. String
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* preservation is exact; numeric preservation is not. However, numeric preservation
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* should extend to the few least-significant bits.
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* //bug472
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*/
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public class NumberRoundTrip {
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static final boolean STRING_COMPARE = true;
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static final boolean EXACT_NUMERIC_COMPARE = false;
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static final double MAX_ERROR = 1e-14;
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static double max_numeric_error = 0;
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static double min_numeric_error = 1;
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String localeName, formatName;
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@Test
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public void TestNumberFormatRoundTrip() {
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System.out.println("Default Locale");
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localeName = "Default Locale";
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formatName = "getInstance";
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doTest(NumberFormat.getInstance());
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formatName = "getNumberInstance";
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doTest(NumberFormat.getNumberInstance());
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formatName = "getCurrencyInstance";
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doTest(NumberFormat.getCurrencyInstance());
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formatName = "getPercentInstance";
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doTest(NumberFormat.getPercentInstance());
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Locale[] loc = NumberFormat.getAvailableLocales();
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for (int i=0; i<loc.length; ++i) {
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System.out.println(loc[i].getDisplayName());
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localeName = loc[i].toString();
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formatName = "getInstance";
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doTest(NumberFormat.getInstance(loc[i]));
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formatName = "getNumberInstance";
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doTest(NumberFormat.getNumberInstance(loc[i]));
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formatName = "getCurrencyInstance";
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doTest(NumberFormat.getCurrencyInstance(loc[i]));
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formatName = "getPercentInstance";
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doTest(NumberFormat.getPercentInstance(loc[i]));
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}
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System.out.println("Numeric error " +
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min_numeric_error + " to " +
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max_numeric_error);
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}
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public void doTest(NumberFormat fmt) {
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doTest(fmt, Double.NaN);
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doTest(fmt, Double.POSITIVE_INFINITY);
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doTest(fmt, Double.NEGATIVE_INFINITY);
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doTest(fmt, 500);
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doTest(fmt, 0);
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doTest(fmt, 5555555555555555L);
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doTest(fmt, 55555555555555555L);
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doTest(fmt, 9223372036854775807L);
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doTest(fmt, 9223372036854775808.0);
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doTest(fmt, -9223372036854775808L);
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doTest(fmt, -9223372036854775809.0);
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for (int i=0; i<2; ++i) {
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doTest(fmt, randomDouble(1));
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doTest(fmt, randomDouble(10000));
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doTest(fmt, Math.floor(randomDouble(10000)));
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doTest(fmt, randomDouble(1e50));
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doTest(fmt, randomDouble(1e-50));
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doTest(fmt, randomDouble(1e100));
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// The use of double d such that isInfinite(100d) causes the
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// numeric test to fail with percent formats (bug 4266589).
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// Largest double s.t. 100d < Inf: d=1.7976931348623156E306
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doTest(fmt, randomDouble(1e306));
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doTest(fmt, randomDouble(1e-323));
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doTest(fmt, randomDouble(1e-100));
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}
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}
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/**
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* Return a random value from -range..+range.
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*/
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public double randomDouble(double range) {
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double a = Math.random();
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return (2.0 * range * a) - range;
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}
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public void doTest(NumberFormat fmt, double value) {
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doTest(fmt, Double.valueOf(value));
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}
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public void doTest(NumberFormat fmt, long value) {
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doTest(fmt, Long.valueOf(value));
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}
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static double proportionalError(Number a, Number b) {
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double aa = a.doubleValue(), bb = b.doubleValue();
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double error = aa - bb;
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if (aa != 0 && bb != 0) error /= aa;
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return Math.abs(error);
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}
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public void doTest(NumberFormat fmt, Number value) {
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fmt.setMaximumFractionDigits(Integer.MAX_VALUE);
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String s = fmt.format(value), s2 = null;
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Number n = null;
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String err = "";
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try {
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System.out.println(" " + value + " F> " + escape(s));
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n = fmt.parse(s);
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System.out.println(" " + escape(s) + " P> " + n);
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s2 = fmt.format(n);
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System.out.println(" " + n + " F> " + escape(s2));
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if (STRING_COMPARE) {
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if (!s.equals(s2)) {
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if (fmt instanceof DecimalFormat) {
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System.out.println("Text mismatch: expected: " + s + ", got: " + s2 + " --- Try BigDecimal parsing.");
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((DecimalFormat)fmt).setParseBigDecimal(true);
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n = fmt.parse(s);
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System.out.println(" " + escape(s) + " P> " + n);
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s2 = fmt.format(n);
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System.out.println(" " + n + " F> " + escape(s2));
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((DecimalFormat)fmt).setParseBigDecimal(false);
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if (!s.equals(s2)) {
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err = "STRING ERROR(DecimalFormat): ";
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}
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} else {
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err = "STRING ERROR(NumberFormat): ";
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}
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}
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}
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if (EXACT_NUMERIC_COMPARE) {
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if (value.doubleValue() != n.doubleValue()) {
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err += "NUMERIC ERROR: ";
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}
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} else {
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// Compute proportional error
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double error = proportionalError(value, n);
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if (error > MAX_ERROR) {
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err += "NUMERIC ERROR " + error + ": ";
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}
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if (error > max_numeric_error) max_numeric_error = error;
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if (error < min_numeric_error) min_numeric_error = error;
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}
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String message = value + typeOf(value) + " F> " +
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escape(s) + " P> " +
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n + typeOf(n) + " F> " +
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escape(s2);
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if (err.length() > 0) {
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fail("*** " + err + " with " +
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formatName + " in " + localeName +
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" " + message);
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} else {
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System.out.println(message);
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}
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} catch (ParseException e) {
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fail("*** " + e.toString() + " with " +
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formatName + " in " + localeName);
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}
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}
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static String typeOf(Number n) {
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if (n instanceof Long) return " Long";
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if (n instanceof Double) return " Double";
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return " Number";
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}
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static String escape(String s) {
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StringBuffer buf = new StringBuffer();
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for (int i=0; i<s.length(); ++i) {
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char c = s.charAt(i);
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if (c < (char)0xFF) {
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buf.append(c);
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} else {
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buf.append("\\U");
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buf.append(Integer.toHexString((c & 0xF000) >> 12));
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buf.append(Integer.toHexString((c & 0x0F00) >> 8));
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buf.append(Integer.toHexString((c & 0x00F0) >> 4));
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buf.append(Integer.toHexString(c & 0x000F));
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}
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}
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return buf.toString();
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}
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}
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