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908aca29ca
Co-authored-by: Brian Goetz <briangoetz@openjdk.org> Co-authored-by: Mandy Chung <mchung@openjdk.org> Co-authored-by: Jan Lahoda <jlahoda@openjdk.org> Reviewed-by: mcimadamore, forax, godin, psandoz, mchung
100 lines
3.3 KiB
Java
100 lines
3.3 KiB
Java
/*
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* Copyright (c) 2017, 2019, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* @test
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* @bug 8262891
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* @summary Check guards implementation.
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* @compile --enable-preview -source ${jdk.version} Guards.java
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* @run main/othervm --enable-preview Guards
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*/
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import java.util.Objects;
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import java.util.function.Function;
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public class Guards {
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public static void main(String... args) {
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new Guards().run();
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}
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void run() {
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run(this::typeTestPatternSwitchTest);
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run(this::typeTestPatternSwitchExpressionTest);
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run(this::testBooleanSwitchExpression);
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assertEquals("a", testPatternInGuard("a"));
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assertEquals(null, testPatternInGuard(1));
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}
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void run(Function<Object, String> convert) {
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assertEquals("zero", convert.apply(0));
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assertEquals("one", convert.apply(1));
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assertEquals("other", convert.apply(-1));
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assertEquals("any", convert.apply(""));
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}
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String typeTestPatternSwitchTest(Object o) {
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switch (o) {
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case Integer i && i == 0: return "zero";
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case Integer i && i == 1: return "one";
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case Integer i: return "other";
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case Object x: return "any";
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}
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}
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String typeTestPatternSwitchExpressionTest(Object o) {
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return switch (o) {
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case Integer i && i == 0 -> "zero";
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case Integer i && i == 1 -> { yield "one"; }
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case Integer i -> "other";
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case Object x -> "any";
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};
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}
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String testBooleanSwitchExpression(Object o) {
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String x;
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if (switch (o) {
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case Integer i && i == 0 -> (x = "zero") != null;
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case Integer i && i == 1 -> { x = "one"; yield true; }
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case Integer i -> { x = "other"; yield true; }
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case Object other -> (x = "any") != null;
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}) {
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return x;
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} else {
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throw new IllegalStateException("TODO - needed?");
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}
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}
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String testPatternInGuard(Object o) {
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if (o instanceof (CharSequence cs && cs instanceof String s)) {
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return s;
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}
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return null;
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}
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void assertEquals(String expected, String actual) {
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if (!Objects.equals(expected, actual)) {
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throw new AssertionError("Expected: " + expected + ", but got: " + actual);
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}
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}
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}
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