/* * 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 Optional * @author Mike Duigou * @build ObscureException * @run testng Basic */ import java.util.List; import java.util.NoSuchElementException; import java.util.Optional; import java.util.concurrent.atomic.AtomicBoolean; import java.util.function.Predicate; import static java.util.stream.Collectors.toList; import static org.testng.Assert.*; import org.testng.annotations.Test; public class Basic { /** * Checks a block of assertions over an empty Optional. */ void checkEmpty(Optional empty) { assertTrue(empty.equals(Optional.empty())); assertTrue(Optional.empty().equals(empty)); assertFalse(empty.equals(Optional.of("unexpected"))); assertFalse(Optional.of("unexpected").equals(empty)); assertFalse(empty.equals("unexpected")); assertFalse(empty.isPresent()); assertTrue(empty.isEmpty()); assertEquals(empty.hashCode(), 0); assertEquals(empty.orElse("x"), "x"); assertEquals(empty.orElseGet(() -> "y"), "y"); assertThrows(NoSuchElementException.class, () -> empty.get()); 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(), "Optional.empty"); } /** * Checks a block of assertions over an Optional that is expected to * have a particular value present. */ void checkPresent(Optional opt, String expected) { assertFalse(opt.equals(Optional.empty())); assertFalse(Optional.empty().equals(opt)); assertTrue(opt.equals(Optional.of(expected))); assertTrue(Optional.of(expected).equals(opt)); assertFalse(opt.equals(Optional.of("unexpected"))); assertFalse(Optional.of("unexpected").equals(opt)); assertFalse(opt.equals("unexpected")); assertTrue(opt.isPresent()); assertEquals(opt.hashCode(), expected.hashCode()); assertEquals(opt.orElse("unexpected"), expected); assertEquals(opt.orElseGet(() -> "unexpected"), expected); assertEquals(opt.get(), 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(), "Optional[" + expected + "]"); } @Test(groups = "unit") public void testEmpty() { checkEmpty(Optional.empty()); } @Test(groups = "unit") public void testOfNull() { assertThrows(NullPointerException.class, () -> Optional.of(null)); } @Test(groups = "unit") public void testOfPresent() { checkPresent(Optional.of("xyzzy"), "xyzzy"); } @Test(groups = "unit") public void testOfNullableNull() { checkEmpty(Optional.ofNullable(null)); } @Test(groups = "unit") public void testOfNullablePresent() { checkPresent(Optional.ofNullable("xyzzy"), "xyzzy"); } @Test(groups = "unit") public void testFilterEmpty() { checkEmpty(Optional.empty().filter(s -> { fail(); return true; })); } @Test(groups = "unit") public void testFilterFalse() { checkEmpty(Optional.of("xyzzy").filter(s -> s.equals("plugh"))); } @Test(groups = "unit") public void testFilterTrue() { checkPresent(Optional.of("xyzzy").filter(s -> s.equals("xyzzy")), "xyzzy"); } @Test(groups = "unit") public void testMapEmpty() { checkEmpty(Optional.empty().map(s -> { fail(); return ""; })); } @Test(groups = "unit") public void testMapPresent() { checkPresent(Optional.of("xyzzy").map(s -> s.replace("xyzzy", "plugh")), "plugh"); } @Test(groups = "unit") public void testFlatMapEmpty() { checkEmpty(Optional.empty().flatMap(s -> { fail(); return Optional.of(""); })); } @Test(groups = "unit") public void testFlatMapPresentReturnEmpty() { checkEmpty(Optional.of("xyzzy") .flatMap(s -> { assertEquals(s, "xyzzy"); return Optional.empty(); })); } @Test(groups = "unit") public void testFlatMapPresentReturnPresent() { checkPresent(Optional.of("xyzzy") .flatMap(s -> { assertEquals(s, "xyzzy"); return Optional.of("plugh"); }), "plugh"); } @Test(groups = "unit") public void testOrEmptyEmpty() { checkEmpty(Optional.empty().or(() -> Optional.empty())); } @Test(groups = "unit") public void testOrEmptyPresent() { checkPresent(Optional.empty().or(() -> Optional.of("plugh")), "plugh"); } @Test(groups = "unit") public void testOrPresentDontCare() { checkPresent(Optional.of("xyzzy").or(() -> { fail(); return Optional.of("plugh"); }), "xyzzy"); } @Test(groups = "unit") public void testStreamEmpty() { assertEquals(Optional.empty().stream().collect(toList()), List.of()); } @Test(groups = "unit") public void testStreamPresent() { assertEquals(Optional.of("xyzzy").stream().collect(toList()), List.of("xyzzy")); } @Test(groups = "unit") public void testIsEmpty() { var integerList = List.of(1,2,3,4,5); Predicate isPositiveNumber = (x -> x > 0); Predicate isNegativeNumber = (x -> x < 0); Optional positiveNumber = integerList.stream().filter(isPositiveNumber).findAny(); Optional negativeNumber = integerList.stream().filter(isNegativeNumber).findAny(); assertFalse(positiveNumber.isEmpty()); assertTrue(negativeNumber.isEmpty()); } }