| /* |
| * 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 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<String> 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<String> 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()); |
| assertFalse(opt.isEmpty()); |
| 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.<String>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.<String>empty().or(() -> Optional.empty())); |
| } |
| |
| @Test(groups = "unit") |
| public void testOrEmptyPresent() { |
| checkPresent(Optional.<String>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")); |
| } |
| } |