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

    21  * questions.

    22  */

    23 

    24 import java.util.stream.Collectors;

    25 import java.util.stream.IntStream;

    26 

    27 /**

    28  * @test

    29  * @summary Basic isBlank functionality

    30  * @bug 8200436

    31  * @run main/othervm IsBlank

    32  */

    33 

    34 public class IsBlank {

    35    public static void main(String... arg) {

    36         testIsBlank();

    37         testWhitespace();

    38     }

    39 

    40     /*

    41      * Test with strings

    42      */

    43     static void testIsBlank() {

    44         test("", true);

    45         test(" ", true);

    46         test(" \t", true);

    47         test("  \u1680", true);

    48         test("   abc   ", false);

    49         test("   abc\u2022", false);

    50     }

    51 

    52     /*

    53      * Test full whitespace range

    54      */

    55     static void testWhitespace() {

    56         StringBuilder sb = new StringBuilder(64);

    57         IntStream.range(1, 0xFFFF).filter(c -> Character.isWhitespace(c))

    58                 .forEach(c -> sb.append((char)c));

    59         String whiteSpace = sb.toString();

    60 

    61         test(whiteSpace, true);

    62         test(whiteSpace + "abc" + whiteSpace, false);

    63     }

    64 

    65     /*

    66      * Raise an exception if the two inputs are not equivalent.

    67      */

    68     static void test(String input, boolean expected) {

    69         if (input.isBlank() != expected) {

    70             System.err.format("Failed test, Input: %s, Expected: %b%n", input, expected);

    71             throw new RuntimeException();

    72         }

    73     }

    74 }