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Datei: BasicLong.java Sprache: JAVA

/*
* Copyright (c) 2013, 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
* questions.
*/

/* @test
* @bug 8195649
* @summary Basic functional test of OptionalLong
* @author Mike Duigou
* @build ObscureException
* @run testng BasicLong
*/

import java.util.NoSuchElementException;
import java.util.OptionalLong;
import java.util.concurrent.atomic.AtomicBoolean;

import static org.testng.Assert.*;
import org.testng.annotations.Test;

public class BasicLong {
    static final long LONGVAL = 2_305_843_008_139_952_128L;
    static final long UNEXPECTED = 0xFEEDBEEFCAFEBABEL;

    /**
     * Checks a block of assertions over an empty OptionalLong.
     */
    void checkEmpty(OptionalLong empty) {
        assertTrue(empty.equals(OptionalLong.empty()));
        assertTrue(OptionalLong.empty().equals(empty));
        assertFalse(empty.equals(OptionalLong.of(UNEXPECTED)));
        assertFalse(OptionalLong.of(UNEXPECTED).equals(empty));
        assertFalse(empty.equals("unexpected"));

        assertFalse(empty.isPresent());
        assertTrue(empty.isEmpty());
        assertEquals(empty.hashCode(), 0);
        assertEquals(empty.orElse(UNEXPECTED), UNEXPECTED);
        assertEquals(empty.orElseGet(() -> UNEXPECTED), UNEXPECTED);

        assertThrows(NoSuchElementException.class, () -> empty.getAsLong());
        assertThrows(NoSuchElementException.class, () -> empty.orElseThrow());
        assertThrows(ObscureException.class,       () -> empty.orElseThrow(ObscureException::new));

        var b = new AtomicBoolean();
        empty.ifPresent(s -> b.set(true));
        assertFalse(b.get());

        var b1 = new AtomicBoolean(false);
        var b2 = new AtomicBoolean(false);
        empty.ifPresentOrElse(s -> b1.set(true), () -> b2.set(true));
        assertFalse(b1.get());
        assertTrue(b2.get());

        assertEquals(empty.toString(), "OptionalLong.empty");
    }

    /**
     * Checks a block of assertions over an OptionalLong that is expected to
     * have a particular value present.
     */
    void checkPresent(OptionalLong opt, long expected) {
        assertFalse(opt.equals(OptionalLong.empty()));
        assertFalse(OptionalLong.empty().equals(opt));
        assertTrue(opt.equals(OptionalLong.of(expected)));
        assertTrue(OptionalLong.of(expected).equals(opt));
        assertFalse(opt.equals(OptionalLong.of(UNEXPECTED)));
        assertFalse(OptionalLong.of(UNEXPECTED).equals(opt));
        assertFalse(opt.equals("unexpected"));

        assertTrue(opt.isPresent());
        assertFalse(opt.isEmpty());
        assertEquals(opt.hashCode(), Long.hashCode(expected));
        assertEquals(opt.orElse(UNEXPECTED), expected);
        assertEquals(opt.orElseGet(() -> UNEXPECTED), expected);

        assertEquals(opt.getAsLong(), expected);
        assertEquals(opt.orElseThrow(), expected);
        assertEquals(opt.orElseThrow(ObscureException::new), expected);

        var b = new AtomicBoolean(false);
        opt.ifPresent(s -> b.set(true));
        assertTrue(b.get());

        var b1 = new AtomicBoolean(false);
        var b2 = new AtomicBoolean(false);
        opt.ifPresentOrElse(s -> b1.set(true), () -> b2.set(true));
        assertTrue(b1.get());
        assertFalse(b2.get());

        assertEquals(opt.toString(), "OptionalLong[" + expected + "]");
    }

    @Test(groups = "unit")
    public void testEmpty() {
        checkEmpty(OptionalLong.empty());
    }

    @Test(groups = "unit")
    public void testPresent() {
        checkPresent(OptionalLong.of(LONGVAL), LONGVAL);
    }

    @Test(groups = "unit")
    public void testStreamEmpty() {
        assertEquals(OptionalLong.empty().stream().toArray(), new long[] { });
    }

    @Test(groups = "unit")
    public void testStreamPresent() {
        assertEquals(OptionalLong.of(LONGVAL).stream().toArray(), new long[] { LONGVAL });
    }
}

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