| /* |
| * Copyright (c) 2012, 2013, 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. |
| */ |
| package org.openjdk.tests.java.util.stream; |
| |
| import java.util.Arrays; |
| import java.util.Collection; |
| import java.util.HashSet; |
| import java.util.Iterator; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.Objects; |
| import java.util.Set; |
| import java.util.function.Function; |
| import java.util.stream.Collector; |
| import java.util.stream.Collectors; |
| import java.util.stream.LambdaTestHelpers; |
| import java.util.stream.OpTestCase; |
| import java.util.stream.Stream; |
| import java.util.stream.StreamTestDataProvider; |
| import java.util.stream.TestData; |
| |
| import org.testng.annotations.Test; |
| |
| import static java.util.stream.LambdaTestHelpers.countTo; |
| import static java.util.stream.LambdaTestHelpers.mDoubler; |
| import static java.util.stream.LambdaTestHelpers.mId; |
| import static java.util.stream.LambdaTestHelpers.mZero; |
| import static java.util.stream.LambdaTestHelpers.pEven; |
| import static java.util.stream.LambdaTestHelpers.pFalse; |
| import static java.util.stream.LambdaTestHelpers.pOdd; |
| import static java.util.stream.LambdaTestHelpers.pTrue; |
| |
| /** |
| * GroupByOpTest |
| * |
| */ |
| @Test |
| public class GroupByOpTest extends OpTestCase { |
| |
| public void testBypassCollect() { |
| @SuppressWarnings("unchecked") |
| Collector<Integer, Map<Boolean, List<Integer>>, Map<Boolean, List<Integer>>> collector |
| = (Collector<Integer, Map<Boolean, List<Integer>>, Map<Boolean, List<Integer>>>) Collectors.groupingBy(LambdaTestHelpers.forPredicate(pEven, true, false)); |
| |
| Map<Boolean, List<Integer>> m = collector.supplier().get(); |
| int[] ints = countTo(10).stream().mapToInt(e -> (int) e).toArray(); |
| for (int i : ints) |
| collector.accumulator().accept(m, i); |
| |
| assertEquals(2, m.keySet().size()); |
| for(Collection<Integer> group : m.values()) { |
| int count = 0; |
| Stream<Integer> stream = group.stream(); |
| Iterator<Integer> it = stream.iterator(); |
| while (it.hasNext()) { |
| it.next(); |
| ++count; |
| } |
| assertEquals(5, count); |
| } |
| } |
| |
| public void testGroupBy() { |
| Map<Boolean,List<Integer>> result = countTo(10).stream().collect(Collectors.groupingBy(LambdaTestHelpers.forPredicate(pEven, true, false))); |
| |
| assertEquals(2, result.keySet().size()); |
| for(Collection<Integer> group : result.values()) { |
| int count = 0; |
| Stream<Integer> stream = group.stream(); |
| Iterator<Integer> it = stream.iterator(); |
| while (it.hasNext()) { |
| it.next(); |
| ++count; |
| } |
| assertEquals(5, count); |
| } |
| } |
| |
| static class MapperData<T, K> { |
| Function<T, K> m; |
| int expectedSize; |
| |
| MapperData(Function<T, K> m, int expectedSize) { |
| this.m = m; |
| this.expectedSize = expectedSize; |
| } |
| } |
| |
| List<MapperData<Integer, ?>> getMapperData(TestData.OfRef<Integer> data) { |
| int uniqueSize = data.into(new HashSet<>()).size(); |
| |
| return Arrays.asList( |
| new MapperData<>(mId, uniqueSize), |
| new MapperData<>(mZero, Math.min(1, data.size())), |
| new MapperData<>(mDoubler, uniqueSize), |
| new MapperData<>(LambdaTestHelpers.compose(mId, mDoubler), uniqueSize), |
| new MapperData<>(LambdaTestHelpers.compose(mDoubler, mDoubler), uniqueSize), |
| |
| new MapperData<>(LambdaTestHelpers.forPredicate(pFalse, true, false), Math.min(1, uniqueSize)), |
| new MapperData<>(LambdaTestHelpers.forPredicate(pTrue, true, false), Math.min(1, uniqueSize)), |
| new MapperData<>(LambdaTestHelpers.forPredicate(pEven, true, false), Math.min(2, uniqueSize)), |
| new MapperData<>(LambdaTestHelpers.forPredicate(pOdd, true, false), Math.min(2, uniqueSize)) |
| ); |
| } |
| |
| @Test(dataProvider = "StreamTestData<Integer>", dataProviderClass = StreamTestDataProvider.class) |
| public void testOps(String name, TestData.OfRef<Integer> data) { |
| // @@@ More things to test here: |
| // - Every value in data is present in right bucket |
| // - Total number of values equals size of data |
| |
| for (MapperData<Integer, ?> md : getMapperData(data)) { |
| Collector<Integer, ?, Map<Object, List<Integer>>> tab = Collectors.groupingBy(md.m); |
| Map<Object, List<Integer>> result = |
| withData(data) |
| .terminal(s -> s, s -> s.collect(tab)) |
| .resultAsserter((act, exp, ord, par) -> { |
| if (par & !ord) { |
| GroupByOpTest.assertMultiMapEquals(act, exp); |
| } |
| else { |
| GroupByOpTest.assertObjectEquals(act, exp); |
| } |
| }) |
| .exercise(); |
| assertEquals(result.keySet().size(), md.expectedSize); |
| } |
| } |
| |
| static void assertObjectEquals(Object a, Object b) { |
| assertTrue(Objects.equals(a, b)); |
| } |
| |
| static <K, V> void assertMultiMapEquals(Map<K, ? extends Collection<V>> a, Map<K, ? extends Collection<V>> b) { |
| assertTrue(multiMapEquals(a, b)); |
| } |
| |
| static<K, V> boolean multiMapEquals(Map<K, ? extends Collection<V>> a, Map<K, ? extends Collection<V>> b) { |
| if (!Objects.equals(a.keySet(), b.keySet())) { |
| return false; |
| } |
| |
| for (K k : a.keySet()) { |
| Set<V> as = new HashSet<>(a.get(k)); |
| Set<V> bs = new HashSet<>(b.get(k)); |
| if (!Objects.equals(as, bs)) { |
| return false; |
| } |
| } |
| |
| return true; |
| } |
| } |