1 /*
  2  * Copyright (c) 1997, 2016, 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  * @summary round trip test NumberFormat
 27  * @library /java/text/testlib
 28  * @key randomness
 29  */
 30 
 31 import java.text.*;
 32 import java.util.*;
 33 
 34 /**
 35  * This class tests the round-trip behavior of NumberFormat, DecimalFormat, and DigitList.
 36  * Round-trip behavior is tested by taking a numeric value and formatting it, then
 37  * parsing the resulting string, and comparing this result with the original value.
 38  * Two tests are applied:  String preservation, and numeric preservation.  String
 39  * preservation is exact; numeric preservation is not.  However, numeric preservation
 40  * should extend to the few least-significant bits.
 41  * //bug472
 42  */
 43 public class NumberRoundTrip extends IntlTest {
 44     static final boolean STRING_COMPARE = true;
 45     static final boolean EXACT_NUMERIC_COMPARE = false;
 46     static final double MAX_ERROR = 1e-14;
 47     static boolean DEBUG = false;
 48     static double max_numeric_error = 0;
 49     static double min_numeric_error = 1;
 50 
 51     String localeName, formatName;
 52 
 53     public static void main(String[] args) throws Exception {
 54         if (args.length > 0 && args[0].equals("-debug")) {
 55             DEBUG = true;
 56             String[] newargs = new String[args.length - 1];
 57             System.arraycopy(args, 1, newargs, 0, newargs.length);
 58             args = newargs;
 59         }
 60         new NumberRoundTrip().run(args);
 61     }
 62 
 63     public void TestNumberFormatRoundTrip() {
 64         logln("Default Locale");
 65         localeName = "Default Locale";
 66         formatName = "getInstance";
 67         doTest(NumberFormat.getInstance());
 68         formatName = "getNumberInstance";
 69         doTest(NumberFormat.getNumberInstance());
 70         formatName = "getCurrencyInstance";
 71         doTest(NumberFormat.getCurrencyInstance());
 72         formatName = "getPercentInstance";
 73         doTest(NumberFormat.getPercentInstance());
 74 
 75         Locale[] loc = NumberFormat.getAvailableLocales();
 76         for (int i=0; i<loc.length; ++i) {
 77             logln(loc[i].getDisplayName());
 78             localeName = loc[i].toString();
 79             formatName = "getInstance";
 80             doTest(NumberFormat.getInstance(loc[i]));
 81             formatName = "getNumberInstance";
 82             doTest(NumberFormat.getNumberInstance(loc[i]));
 83             formatName = "getCurrencyInstance";
 84             doTest(NumberFormat.getCurrencyInstance(loc[i]));
 85             formatName = "getPercentInstance";
 86             doTest(NumberFormat.getPercentInstance(loc[i]));
 87         }
 88 
 89         logln("Numeric error " +
 90               min_numeric_error + " to " +
 91               max_numeric_error);
 92     }
 93 
 94     public void doTest(NumberFormat fmt) {
 95         doTest(fmt, Double.NaN);
 96         doTest(fmt, Double.POSITIVE_INFINITY);
 97         doTest(fmt, Double.NEGATIVE_INFINITY);
 98 
 99         doTest(fmt, 500);
100         doTest(fmt, 0);
101         doTest(fmt, 5555555555555555L);
102         doTest(fmt, 55555555555555555L);
103         doTest(fmt, 9223372036854775807L);
104         doTest(fmt, 9223372036854775808.0);
105         doTest(fmt, -9223372036854775808L);
106         doTest(fmt, -9223372036854775809.0);
107 
108         for (int i=0; i<2; ++i) {
109             doTest(fmt, randomDouble(1));
110             doTest(fmt, randomDouble(10000));
111             doTest(fmt, Math.floor(randomDouble(10000)));
112             doTest(fmt, randomDouble(1e50));
113             doTest(fmt, randomDouble(1e-50));
114             doTest(fmt, randomDouble(1e100));
115             // The use of double d such that isInfinite(100d) causes the
116             // numeric test to fail with percent formats (bug 4266589).
117             // Largest double s.t. 100d < Inf: d=1.7976931348623156E306
118             doTest(fmt, randomDouble(1e306));
119             doTest(fmt, randomDouble(1e-323));
120             doTest(fmt, randomDouble(1e-100));
121         }
122     }
123 
124     /**
125      * Return a random value from -range..+range.
126      */
127     public double randomDouble(double range) {
128         double a = Math.random();
129         return (2.0 * range * a) - range;
130     }
131 
132     public void doTest(NumberFormat fmt, double value) {
133         doTest(fmt, Double.valueOf(value));
134     }
135 
136     public void doTest(NumberFormat fmt, long value) {
137         doTest(fmt, Long.valueOf(value));
138     }
139 
140     static double proportionalError(Number a, Number b) {
141         double aa = a.doubleValue(), bb = b.doubleValue();
142         double error = aa - bb;
143         if (aa != 0 && bb != 0) error /= aa;
144         return Math.abs(error);
145     }
146 
147     public void doTest(NumberFormat fmt, Number value) {
148         fmt.setMaximumFractionDigits(Integer.MAX_VALUE);
149         String s = fmt.format(value), s2 = null;
150         Number n = null;
151         String err = "";
152         try {
153             if (DEBUG) logln("  " + value + " F> " + escape(s));
154             n = fmt.parse(s);
155             if (DEBUG) logln("  " + escape(s) + " P> " + n);
156             s2 = fmt.format(n);
157             if (DEBUG) logln("  " + n + " F> " + escape(s2));
158 
159             if (STRING_COMPARE) {
160                 if (!s.equals(s2)) {
161                     if (fmt instanceof DecimalFormat) {
162                         logln("Text mismatch: expected: " + s + ", got: " + s2 + " --- Try BigDecimal parsing.");
163                         ((DecimalFormat)fmt).setParseBigDecimal(true);
164                         n = fmt.parse(s);
165                         if (DEBUG) logln("  " + escape(s) + " P> " + n);
166                         s2 = fmt.format(n);
167                         if (DEBUG) logln("  " + n + " F> " + escape(s2));
168                         ((DecimalFormat)fmt).setParseBigDecimal(false);
169 
170                         if (!s.equals(s2)) {
171                             err = "STRING ERROR(DecimalFormat): ";
172                         }
173                     } else {
174                         err = "STRING ERROR(NumberFormat): ";
175                     }
176                 }
177             }
178 
179             if (EXACT_NUMERIC_COMPARE) {
180                 if (value.doubleValue() != n.doubleValue()) {
181                     err += "NUMERIC ERROR: ";
182                 }
183             } else {
184                 // Compute proportional error
185                 double error = proportionalError(value, n);
186 
187                 if (error > MAX_ERROR) {
188                     err += "NUMERIC ERROR " + error + ": ";
189                 }
190 
191                 if (error > max_numeric_error) max_numeric_error = error;
192                 if (error < min_numeric_error) min_numeric_error = error;
193             }
194 
195             String message = value + typeOf(value) + " F> " +
196                 escape(s) + " P> " +
197                 n + typeOf(n) + " F> " +
198                 escape(s2);
199             if (err.length() > 0) {
200                 errln("*** " + err + " with " +
201                       formatName + " in " + localeName +
202                       " " + message);
203             } else {
204                 logln(message);
205             }
206         } catch (ParseException e) {
207             errln("*** " + e.toString() + " with " +
208                   formatName + " in " + localeName);
209         }
210     }
211 
212     static String typeOf(Number n) {
213         if (n instanceof Long) return " Long";
214         if (n instanceof Double) return " Double";
215         return " Number";
216     }
217 
218     static String escape(String s) {
219         StringBuffer buf = new StringBuffer();
220         for (int i=0; i<s.length(); ++i) {
221             char c = s.charAt(i);
222             if (c < (char)0xFF) {
223                 buf.append(c);
224             } else {
225                 buf.append("\\U");
226                 buf.append(Integer.toHexString((c & 0xF000) >> 12));
227                 buf.append(Integer.toHexString((c & 0x0F00) >> 8));
228                 buf.append(Integer.toHexString((c & 0x00F0) >> 4));
229                 buf.append(Integer.toHexString(c & 0x000F));
230             }
231         }
232         return buf.toString();
233     }
234 }