134 lines
4.8 KiB
Java
134 lines
4.8 KiB
Java
/*
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* Copyright (c) 2023, 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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import java.util.Arrays;
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import java.util.List;
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import java.util.stream.Gatherers;
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import java.util.stream.Stream;
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import org.junit.jupiter.api.Test;
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import org.junit.jupiter.params.ParameterizedTest;
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import org.junit.jupiter.params.provider.MethodSource;
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import org.junit.jupiter.params.provider.ValueSource;
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import static org.junit.jupiter.api.Assertions.*;
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import static org.junit.jupiter.api.Assumptions.*;
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/**
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* @test
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* @summary Tests the API and contract of Gatherers.windowFixed
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* @run junit GatherersWindowFixedTest
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*/
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public class GatherersWindowFixedTest {
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record Config(int streamSize, boolean parallel) {
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Stream<Integer> stream() {
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var stream = Stream.iterate(1, i -> i + 1).limit(streamSize);
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stream = parallel ? stream.parallel() : stream.sequential();
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return stream;
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}
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}
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static final Stream<Integer> sizes(){
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return Stream.of(0,1,10,33,99,9999);
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}
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static final Stream<Config> sequentialAndParallel(int size) {
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return Stream.of(false, true)
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.map(parallel ->
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new Config(size, parallel));
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}
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static final Stream<Config> configurations() {
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return sizes().flatMap(i -> sequentialAndParallel(i));
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}
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static final Stream<Config> nonempty_configurations() {
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return sizes().filter(i -> i > 0).flatMap(i -> sequentialAndParallel(i));
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}
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@ParameterizedTest
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@ValueSource(ints = { Integer.MIN_VALUE, -999, -1, 0})
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public void throwsIAEWhenWindowSizeIsSmallerThanOne(int windowSize) {
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assertThrows(IllegalArgumentException.class,
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() -> Gatherers.windowFixed(windowSize));
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}
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@ParameterizedTest
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@MethodSource("nonempty_configurations")
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public void behavesAsExpectedWhenWindowSizeIsSizeOfStream(Config config) {
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final var streamSize = config.streamSize();
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final var result = config.stream()
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.gather(Gatherers.windowFixed(streamSize))
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.toList();
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assertEquals(1, result.size());
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assertEquals(config.stream().toList(), result.get(0));
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}
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@Test
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public void toleratesNullElements() {
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assertEquals(
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List.of(Arrays.asList(null, null)),
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Stream.of(null, null)
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.gather(Gatherers.windowFixed(2))
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.toList());
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}
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@Test
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public void throwsUOEWhenWindowsAreAttemptedToBeModified() {
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var window = Stream.of(1)
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.gather(Gatherers.windowFixed(1))
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.findFirst()
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.get();
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assertThrows(UnsupportedOperationException.class,
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() -> window.add(2));
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}
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@ParameterizedTest
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@MethodSource("configurations")
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public void behavesAsExpected(Config config) {
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final var streamSize = config.streamSize();
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// Tests that the layout of the returned data is as expected
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for (var windowSize : List.of(1, 2, 3, 10)) {
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final var expectLastWindowSize = streamSize % windowSize == 0 ? windowSize : streamSize % windowSize;
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final var expectedSize = (streamSize / windowSize) + ((streamSize % windowSize == 0) ? 0 : 1);
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final var expected = config.stream().toList().iterator();
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final var result = config.stream()
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.gather(Gatherers.windowFixed(windowSize))
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.toList();
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int currentWindow = 0;
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for (var window : result) {
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++currentWindow;
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assertEquals(currentWindow < expectedSize ? windowSize : expectLastWindowSize, window.size());
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for (var element : window)
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assertEquals(expected.next(), element);
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}
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assertEquals(expectedSize, currentWindow);
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}
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}
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}
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