1 /*
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  3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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  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  *
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 18  *
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 20  * or visit www.oracle.com if you need additional information or have any
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 22  */
 23 
 24 /*
 25  * @test
 26  * @bug 8001209
 27  * @summary Confirm that the values set by setChoices() are not mutable.
 28  * @run junit Bug8001209
 29  */
 30 
 31 import java.text.ChoiceFormat;
 32 import java.text.ParsePosition;
 33 
 34 import org.junit.jupiter.api.BeforeAll;
 35 import org.junit.jupiter.api.Test;
 36 
 37 import static org.junit.jupiter.api.Assertions.assertEquals;
 38 
 39 public class Bug8001209 {
 40 
 41     // Represents the expected output of formatting the ChoiceFormat
 42     private static String expectedFormattedOutput;
 43     private static ChoiceFormat cFmt;
 44     private static ParsePosition status;
 45     private static String[] originalSetterArray;
 46 
 47     // Build the original ChoiceFormat to test if it can be mutated
 48     @BeforeAll
 49     static void setUpChoiceFormatAndOutput() {
 50         double[] limits = {1, 2, 3, 4, 5, 6, 7};
 51         originalSetterArray = new String[]{"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"};
 52         // Constructor calls setChoices
 53         cFmt = new ChoiceFormat(limits, originalSetterArray);
 54         status = new ParsePosition(0);
 55 
 56         // Build the expected results of formatting with the original ChoiceFormat
 57         StringBuilder before = new StringBuilder();
 58         for (double i = 1.0; i <= 7.0; ++i) {
 59             status.setIndex(0);
 60             String s = cFmt.format(i);
 61             before.append(" ");
 62             before.append(s);
 63             before.append(cFmt.parse(cFmt.format(i), status));
 64         }
 65         expectedFormattedOutput = before.toString();
 66     }
 67 
 68     /*
 69      * Ensure that mutating the arrays returned by getChoices and getLimits does
 70      * not affect the internal representation of the ChoiceFormat.
 71      */
 72     @Test
 73     public void immutableArraysFromGetters() {
 74         // Modify the array returned by getFormats() -> newFormats
 75         String[] newFormats = (String[]) cFmt.getFormats();
 76         newFormats[6] = "Doyoubi";
 77         StringBuilder after = new StringBuilder();
 78         for (double i = 1.0; i <= 7.0; ++i) {
 79             status.setIndex(0);
 80             String s = cFmt.format(i);
 81             after.append(" ");
 82             after.append(s);
 83             after.append(cFmt.parse(cFmt.format(i), status));
 84         }
 85         // Compare the expected results with the new formatted results
 86         assertEquals(after.toString(), expectedFormattedOutput,
 87                 "Mutating array returned from getter changed internals of ChoiceFormat");
 88     }
 89 
 90     /*
 91      * Ensure that mutating the arrays passed to setChoices/constructor does
 92      * not affect the internal representation of the ChoiceFormat.
 93      */
 94     @Test
 95     public void immutableArraysFromSetter() {
 96         // Modify the array passed to setFormats() -> dayOfWeekNames
 97         originalSetterArray[6] = "Saturday";
 98         StringBuilder after = new StringBuilder();
 99         for (double i = 1.0; i <= 7.0; ++i) {
100             status.setIndex(0);
101             String s = cFmt.format(i);
102             after.append(" ");
103             after.append(s);
104             after.append(cFmt.parse(cFmt.format(i), status));
105         }
106         // Compare the expected results with the new formatted results
107         assertEquals(after.toString(), expectedFormattedOutput,
108                 "Mutating array passed to setter changed internals of ChoiceFormat");
109     }
110 }