90 lines
3.2 KiB
Java
90 lines
3.2 KiB
Java
/*
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* Copyright (c) 2015, 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 8020968
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* @summary Sanity test for Function wildcard signature
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* @run main WalkFunction
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*/
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import java.lang.StackWalker.StackFrame;
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import java.util.Optional;
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import java.util.function.Function;
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import java.util.stream.Stream;
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public class WalkFunction {
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private static final StackWalker walker = StackWalker.getInstance();
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public static void main(String... args) throws Exception {
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testFunctions();
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testWildcards();
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walker.walk(counter());
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walker.walk(wildCounter());
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}
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private static void testFunctions() {
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walker.walk(Stream::count);
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try {
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walker.walk(null);
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throw new RuntimeException("NPE expected");
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} catch (NullPointerException e) {}
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Optional<StackFrame> result = walker.walk(WalkFunction::reduce);
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if (!result.get().getClassName().equals(WalkFunction.class.getName())) {
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throw new RuntimeException(result.get() + " expected: " + WalkFunction.class.getName());
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}
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}
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static Optional<StackFrame> reduce(Stream<StackFrame> stream) {
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return stream.reduce((r,f) -> r.getClassName().compareTo(f.getClassName()) > 0 ? f : r);
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}
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private static void testWildcards() {
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Function<? super Stream<? extends StackFrame>, Void> f1 = WalkFunction::function;
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Function<? super Stream<? super StackFrame>, Void> f2 = WalkFunction::function;
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Function<? super Stream<StackFrame>, Void> f3 = WalkFunction::function;
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Function<Stream<? extends StackFrame>, Void> f4 = WalkFunction::function;
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Function<Stream<? super StackFrame>, Void> f5 = WalkFunction::function;
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Function<Stream<StackFrame>, Void> f6 = WalkFunction::function;
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walker.walk(f1);
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walker.walk(f2);
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walker.walk(f3);
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walker.walk(f4);
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walker.walk(f5);
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walker.walk(f6);
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}
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private static Void function(Stream<?> s) {
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return null;
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}
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private static Function<Stream<?>, Long> wildCounter() {
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return Stream::count;
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}
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private static <T> Function<Stream<T>, Long> counter() {
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return Stream::count;
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}
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}
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