/*

 * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

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 */

import java.util.stream.Collectors;

import java.util.stream.IntStream;

/**

 * @test

 * @summary Basic isBlank functionality

 * @bug 8200436

 * @run main/othervm IsBlank

 */

public class IsBlank {

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

        testIsBlank();

        testWhitespace();

    }

    /*

     * Test with strings

     */

    static void testIsBlank() {

        test("", true);

        test(" ", true);

        test(" \t", true);

        test("  \u1680", true);

        test("   abc   ", false);

        test("   abc\u2022", false);

    }

    /*

     * Test full whitespace range

     */

    static void testWhitespace() {

        StringBuilder sb = new StringBuilder(64);

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

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

        String whiteSpace = sb.toString();

        test(whiteSpace, true);

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

    }

    /*

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

     */

    static void test(String input, boolean expected) {

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

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

            throw new RuntimeException();

        }

    }

}