1 /*
2  * Copyright (c) 2018, 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
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22  */
23 package test.java.lang.String;
24 
25 // Android-added: support for wrapper to avoid d8 backporting of String.isBlank (b/191859202).
26 import java.lang.invoke.MethodHandle;
27 import java.lang.invoke.MethodHandles;
28 import java.lang.invoke.MethodType;
29 
30 import java.util.stream.IntStream;
31 
32 import org.testng.annotations.Test;
33 import static org.testng.Assert.assertEquals;
34 
35 /**
36  * @test
37  * @summary Basic isBlank functionality
38  * @bug 8200436
39  * @run main/othervm IsBlank
40  */
41 
42 public class IsBlank {
43     /*
44      * Test with strings
45      */
46     @Test
testIsBlank()47     public void testIsBlank() {
48         test("", true);
49         test(" ", true);
50         test(" \t", true);
51         test("  \u1680", true);
52         test("   abc   ", false);
53         test("   abc\u2022", false);
54     }
55 
56     /*
57      * Test full whitespace range
58      */
59     @Test
testWhitespace()60     void testWhitespace() {
61         StringBuilder sb = new StringBuilder(64);
62         IntStream.range(1, 0xFFFF).filter(c -> Character.isWhitespace(c))
63                 .forEach(c -> sb.append((char)c));
64         String whiteSpace = sb.toString();
65 
66         test(whiteSpace, true);
67         test(whiteSpace + "abc" + whiteSpace, false);
68     }
69 
70     /*
71      * Raise an exception if the two inputs are not equivalent.
72      */
test(String input, boolean expected)73     static void test(String input, boolean expected) {
74         // Android-changed: use wrapper to avoid d8 backporting (b/191859202).
75         // assertEquals(input.isBlank(), expected,
76         assertEquals(String_isBlank(input), expected,
77             String.format("Failed test, Input: %s, Expected: %b%n", input, expected));
78     }
79 
80     // Android-added: wrapper to avoid d8 backporting of String.isBlank (b/191859202).
String_isBlank(String input)81     private static boolean String_isBlank(String input) {
82         try {
83             MethodType isBlankType = MethodType.methodType(boolean.class);
84             MethodHandle isBlank =
85                     MethodHandles.lookup().findVirtual(String.class, "isBlank", isBlankType);
86             return (boolean) isBlank.invokeExact(input);
87         } catch (Throwable t) {
88             throw new RuntimeException(t);
89         }
90     }
91 }
92