--- a/jdk/test/java/util/stream/test/org/openjdk/tests/java/util/stream/TabulatorsTest.java Mon Feb 23 10:47:32 2015 -0800
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,621 +0,0 @@
-/*
- * 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.ArrayList;
-import java.util.Arrays;
-import java.util.Collection;
-import java.util.Collections;
-import java.util.Comparator;
-import java.util.HashMap;
-import java.util.HashSet;
-import java.util.Iterator;
-import java.util.List;
-import java.util.Map;
-import java.util.Optional;
-import java.util.Set;
-import java.util.StringJoiner;
-import java.util.TreeMap;
-import java.util.concurrent.ConcurrentHashMap;
-import java.util.concurrent.ConcurrentSkipListMap;
-import java.util.function.BinaryOperator;
-import java.util.function.Function;
-import java.util.function.Predicate;
-import java.util.function.Supplier;
-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.StreamOpFlagTestHelper;
-import java.util.stream.StreamTestDataProvider;
-import java.util.stream.TestData;
-
-import org.testng.annotations.Test;
-
-import static java.util.stream.Collectors.collectingAndThen;
-import static java.util.stream.Collectors.groupingBy;
-import static java.util.stream.Collectors.groupingByConcurrent;
-import static java.util.stream.Collectors.partitioningBy;
-import static java.util.stream.Collectors.reducing;
-import static java.util.stream.Collectors.toCollection;
-import static java.util.stream.Collectors.toConcurrentMap;
-import static java.util.stream.Collectors.toList;
-import static java.util.stream.Collectors.toMap;
-import static java.util.stream.Collectors.toSet;
-import static java.util.stream.LambdaTestHelpers.assertContents;
-import static java.util.stream.LambdaTestHelpers.assertContentsUnordered;
-import static java.util.stream.LambdaTestHelpers.mDoubler;
-
-/**
- * TabulatorsTest
- *
- * @author Brian Goetz
- */
-@SuppressWarnings({"rawtypes", "unchecked"})
-public class TabulatorsTest extends OpTestCase {
-
- private static abstract class TabulationAssertion<T, U> {
- abstract void assertValue(U value,
- Supplier<Stream<T>> source,
- boolean ordered) throws ReflectiveOperationException;
- }
-
- @SuppressWarnings({"rawtypes", "unchecked"})
- static class GroupedMapAssertion<T, K, V, M extends Map<K, ? extends V>> extends TabulationAssertion<T, M> {
- private final Class<? extends Map> clazz;
- private final Function<T, K> classifier;
- private final TabulationAssertion<T,V> downstream;
-
- protected GroupedMapAssertion(Function<T, K> classifier,
- Class<? extends Map> clazz,
- TabulationAssertion<T, V> downstream) {
- this.clazz = clazz;
- this.classifier = classifier;
- this.downstream = downstream;
- }
-
- void assertValue(M map,
- Supplier<Stream<T>> source,
- boolean ordered) throws ReflectiveOperationException {
- if (!clazz.isAssignableFrom(map.getClass()))
- fail(String.format("Class mismatch in GroupedMapAssertion: %s, %s", clazz, map.getClass()));
- assertContentsUnordered(map.keySet(), source.get().map(classifier).collect(toSet()));
- for (Map.Entry<K, ? extends V> entry : map.entrySet()) {
- K key = entry.getKey();
- downstream.assertValue(entry.getValue(),
- () -> source.get().filter(e -> classifier.apply(e).equals(key)),
- ordered);
- }
- }
- }
-
- static class ToMapAssertion<T, K, V, M extends Map<K,V>> extends TabulationAssertion<T, M> {
- private final Class<? extends Map> clazz;
- private final Function<T, K> keyFn;
- private final Function<T, V> valueFn;
- private final BinaryOperator<V> mergeFn;
-
- ToMapAssertion(Function<T, K> keyFn,
- Function<T, V> valueFn,
- BinaryOperator<V> mergeFn,
- Class<? extends Map> clazz) {
- this.clazz = clazz;
- this.keyFn = keyFn;
- this.valueFn = valueFn;
- this.mergeFn = mergeFn;
- }
-
- @Override
- void assertValue(M map, Supplier<Stream<T>> source, boolean ordered) throws ReflectiveOperationException {
- Set<K> uniqueKeys = source.get().map(keyFn).collect(toSet());
- assertTrue(clazz.isAssignableFrom(map.getClass()));
- assertEquals(uniqueKeys, map.keySet());
- source.get().forEach(t -> {
- K key = keyFn.apply(t);
- V v = source.get()
- .filter(e -> key.equals(keyFn.apply(e)))
- .map(valueFn)
- .reduce(mergeFn)
- .get();
- assertEquals(map.get(key), v);
- });
- }
- }
-
- static class PartitionAssertion<T, D> extends TabulationAssertion<T, Map<Boolean,D>> {
- private final Predicate<T> predicate;
- private final TabulationAssertion<T,D> downstream;
-
- protected PartitionAssertion(Predicate<T> predicate,
- TabulationAssertion<T, D> downstream) {
- this.predicate = predicate;
- this.downstream = downstream;
- }
-
- void assertValue(Map<Boolean, D> map,
- Supplier<Stream<T>> source,
- boolean ordered) throws ReflectiveOperationException {
- if (!Map.class.isAssignableFrom(map.getClass()))
- fail(String.format("Class mismatch in PartitionAssertion: %s", map.getClass()));
- assertEquals(2, map.size());
- downstream.assertValue(map.get(true), () -> source.get().filter(predicate), ordered);
- downstream.assertValue(map.get(false), () -> source.get().filter(predicate.negate()), ordered);
- }
- }
-
- @SuppressWarnings({"rawtypes", "unchecked"})
- static class ListAssertion<T> extends TabulationAssertion<T, List<T>> {
- @Override
- void assertValue(List<T> value, Supplier<Stream<T>> source, boolean ordered)
- throws ReflectiveOperationException {
- if (!List.class.isAssignableFrom(value.getClass()))
- fail(String.format("Class mismatch in ListAssertion: %s", value.getClass()));
- Stream<T> stream = source.get();
- List<T> result = new ArrayList<>();
- for (Iterator<T> it = stream.iterator(); it.hasNext(); ) // avoid capturing result::add
- result.add(it.next());
- if (StreamOpFlagTestHelper.isStreamOrdered(stream) && ordered)
- assertContents(value, result);
- else
- assertContentsUnordered(value, result);
- }
- }
-
- @SuppressWarnings({"rawtypes", "unchecked"})
- static class CollectionAssertion<T> extends TabulationAssertion<T, Collection<T>> {
- private final Class<? extends Collection> clazz;
- private final boolean targetOrdered;
-
- protected CollectionAssertion(Class<? extends Collection> clazz, boolean targetOrdered) {
- this.clazz = clazz;
- this.targetOrdered = targetOrdered;
- }
-
- @Override
- void assertValue(Collection<T> value, Supplier<Stream<T>> source, boolean ordered)
- throws ReflectiveOperationException {
- if (!clazz.isAssignableFrom(value.getClass()))
- fail(String.format("Class mismatch in CollectionAssertion: %s, %s", clazz, value.getClass()));
- Stream<T> stream = source.get();
- Collection<T> result = clazz.newInstance();
- for (Iterator<T> it = stream.iterator(); it.hasNext(); ) // avoid capturing result::add
- result.add(it.next());
- if (StreamOpFlagTestHelper.isStreamOrdered(stream) && targetOrdered && ordered)
- assertContents(value, result);
- else
- assertContentsUnordered(value, result);
- }
- }
-
- static class ReduceAssertion<T, U> extends TabulationAssertion<T, U> {
- private final U identity;
- private final Function<T, U> mapper;
- private final BinaryOperator<U> reducer;
-
- ReduceAssertion(U identity, Function<T, U> mapper, BinaryOperator<U> reducer) {
- this.identity = identity;
- this.mapper = mapper;
- this.reducer = reducer;
- }
-
- @Override
- void assertValue(U value, Supplier<Stream<T>> source, boolean ordered)
- throws ReflectiveOperationException {
- Optional<U> reduced = source.get().map(mapper).reduce(reducer);
- if (value == null)
- assertTrue(!reduced.isPresent());
- else if (!reduced.isPresent()) {
- assertEquals(value, identity);
- }
- else {
- assertEquals(value, reduced.get());
- }
- }
- }
-
- private <T> ResultAsserter<T> mapTabulationAsserter(boolean ordered) {
- return (act, exp, ord, par) -> {
- if (par && (!ordered || !ord)) {
- TabulatorsTest.nestedMapEqualityAssertion(act, exp);
- }
- else {
- LambdaTestHelpers.assertContentsEqual(act, exp);
- }
- };
- }
-
- private<T, M extends Map>
- void exerciseMapTabulation(TestData<T, Stream<T>> data,
- Collector<T, ?, ? extends M> collector,
- TabulationAssertion<T, M> assertion)
- throws ReflectiveOperationException {
- boolean ordered = !collector.characteristics().contains(Collector.Characteristics.UNORDERED);
-
- M m = withData(data)
- .terminal(s -> s.collect(collector))
- .resultAsserter(mapTabulationAsserter(ordered))
- .exercise();
- assertion.assertValue(m, () -> data.stream(), ordered);
-
- m = withData(data)
- .terminal(s -> s.unordered().collect(collector))
- .resultAsserter(mapTabulationAsserter(ordered))
- .exercise();
- assertion.assertValue(m, () -> data.stream(), false);
- }
-
- private static void nestedMapEqualityAssertion(Object o1, Object o2) {
- if (o1 instanceof Map) {
- Map m1 = (Map) o1;
- Map m2 = (Map) o2;
- assertContentsUnordered(m1.keySet(), m2.keySet());
- for (Object k : m1.keySet())
- nestedMapEqualityAssertion(m1.get(k), m2.get(k));
- }
- else if (o1 instanceof Collection) {
- assertContentsUnordered(((Collection) o1), ((Collection) o2));
- }
- else
- assertEquals(o1, o2);
- }
-
- private<T, R> void assertCollect(TestData.OfRef<T> data,
- Collector<T, ?, R> collector,
- Function<Stream<T>, R> streamReduction) {
- R check = streamReduction.apply(data.stream());
- withData(data).terminal(s -> s.collect(collector)).expectedResult(check).exercise();
- }
-
- @Test(dataProvider = "StreamTestData<Integer>", dataProviderClass = StreamTestDataProvider.class)
- public void testReduce(String name, TestData.OfRef<Integer> data) throws ReflectiveOperationException {
- assertCollect(data, Collectors.reducing(0, Integer::sum),
- s -> s.reduce(0, Integer::sum));
- assertCollect(data, Collectors.reducing(Integer.MAX_VALUE, Integer::min),
- s -> s.min(Integer::compare).orElse(Integer.MAX_VALUE));
- assertCollect(data, Collectors.reducing(Integer.MIN_VALUE, Integer::max),
- s -> s.max(Integer::compare).orElse(Integer.MIN_VALUE));
-
- assertCollect(data, Collectors.reducing(Integer::sum),
- s -> s.reduce(Integer::sum));
- assertCollect(data, Collectors.minBy(Comparator.naturalOrder()),
- s -> s.min(Integer::compare));
- assertCollect(data, Collectors.maxBy(Comparator.naturalOrder()),
- s -> s.max(Integer::compare));
-
- assertCollect(data, Collectors.reducing(0, x -> x*2, Integer::sum),
- s -> s.map(x -> x*2).reduce(0, Integer::sum));
-
- assertCollect(data, Collectors.summingLong(x -> x * 2L),
- s -> s.map(x -> x*2L).reduce(0L, Long::sum));
- assertCollect(data, Collectors.summingInt(x -> x * 2),
- s -> s.map(x -> x*2).reduce(0, Integer::sum));
- assertCollect(data, Collectors.summingDouble(x -> x * 2.0d),
- s -> s.map(x -> x * 2.0d).reduce(0.0d, Double::sum));
-
- assertCollect(data, Collectors.averagingInt(x -> x * 2),
- s -> s.mapToInt(x -> x * 2).average().orElse(0));
- assertCollect(data, Collectors.averagingLong(x -> x * 2),
- s -> s.mapToLong(x -> x * 2).average().orElse(0));
- assertCollect(data, Collectors.averagingDouble(x -> x * 2),
- s -> s.mapToDouble(x -> x * 2).average().orElse(0));
-
- // Test explicit Collector.of
- Collector<Integer, long[], Double> avg2xint = Collector.of(() -> new long[2],
- (a, b) -> {
- a[0] += b * 2;
- a[1]++;
- },
- (a, b) -> {
- a[0] += b[0];
- a[1] += b[1];
- return a;
- },
- a -> a[1] == 0 ? 0.0d : (double) a[0] / a[1]);
- assertCollect(data, avg2xint,
- s -> s.mapToInt(x -> x * 2).average().orElse(0));
- }
-
- @Test(dataProvider = "StreamTestData<Integer>", dataProviderClass = StreamTestDataProvider.class)
- public void testJoin(String name, TestData.OfRef<Integer> data) throws ReflectiveOperationException {
- withData(data)
- .terminal(s -> s.map(Object::toString).collect(Collectors.joining()))
- .expectedResult(join(data, ""))
- .exercise();
-
- Collector<String, StringBuilder, String> likeJoining = Collector.of(StringBuilder::new, StringBuilder::append, (sb1, sb2) -> sb1.append(sb2.toString()), StringBuilder::toString);
- withData(data)
- .terminal(s -> s.map(Object::toString).collect(likeJoining))
- .expectedResult(join(data, ""))
- .exercise();
-
- withData(data)
- .terminal(s -> s.map(Object::toString).collect(Collectors.joining(",")))
- .expectedResult(join(data, ","))
- .exercise();
-
- withData(data)
- .terminal(s -> s.map(Object::toString).collect(Collectors.joining(",", "[", "]")))
- .expectedResult("[" + join(data, ",") + "]")
- .exercise();
-
- withData(data)
- .terminal(s -> s.map(Object::toString)
- .collect(StringBuilder::new, StringBuilder::append, StringBuilder::append)
- .toString())
- .expectedResult(join(data, ""))
- .exercise();
-
- withData(data)
- .terminal(s -> s.map(Object::toString)
- .collect(() -> new StringJoiner(","),
- (sj, cs) -> sj.add(cs),
- (j1, j2) -> j1.merge(j2))
- .toString())
- .expectedResult(join(data, ","))
- .exercise();
-
- withData(data)
- .terminal(s -> s.map(Object::toString)
- .collect(() -> new StringJoiner(",", "[", "]"),
- (sj, cs) -> sj.add(cs),
- (j1, j2) -> j1.merge(j2))
- .toString())
- .expectedResult("[" + join(data, ",") + "]")
- .exercise();
- }
-
- private<T> String join(TestData.OfRef<T> data, String delim) {
- StringBuilder sb = new StringBuilder();
- boolean first = true;
- for (T i : data) {
- if (!first)
- sb.append(delim);
- sb.append(i.toString());
- first = false;
- }
- return sb.toString();
- }
-
- @Test(dataProvider = "StreamTestData<Integer>", dataProviderClass = StreamTestDataProvider.class)
- public void testSimpleToMap(String name, TestData.OfRef<Integer> data) throws ReflectiveOperationException {
- Function<Integer, Integer> keyFn = i -> i * 2;
- Function<Integer, Integer> valueFn = i -> i * 4;
-
- List<Integer> dataAsList = Arrays.asList(data.stream().toArray(Integer[]::new));
- Set<Integer> dataAsSet = new HashSet<>(dataAsList);
-
- BinaryOperator<Integer> sum = Integer::sum;
- for (BinaryOperator<Integer> op : Arrays.asList((u, v) -> u,
- (u, v) -> v,
- sum)) {
- try {
- exerciseMapTabulation(data, toMap(keyFn, valueFn),
- new ToMapAssertion<>(keyFn, valueFn, op, HashMap.class));
- if (dataAsList.size() != dataAsSet.size())
- fail("Expected ISE on input with duplicates");
- }
- catch (IllegalStateException e) {
- if (dataAsList.size() == dataAsSet.size())
- fail("Expected no ISE on input without duplicates");
- }
-
- exerciseMapTabulation(data, toMap(keyFn, valueFn, op),
- new ToMapAssertion<>(keyFn, valueFn, op, HashMap.class));
-
- exerciseMapTabulation(data, toMap(keyFn, valueFn, op, TreeMap::new),
- new ToMapAssertion<>(keyFn, valueFn, op, TreeMap.class));
- }
-
- // For concurrent maps, only use commutative merge functions
- try {
- exerciseMapTabulation(data, toConcurrentMap(keyFn, valueFn),
- new ToMapAssertion<>(keyFn, valueFn, sum, ConcurrentHashMap.class));
- if (dataAsList.size() != dataAsSet.size())
- fail("Expected ISE on input with duplicates");
- }
- catch (IllegalStateException e) {
- if (dataAsList.size() == dataAsSet.size())
- fail("Expected no ISE on input without duplicates");
- }
-
- exerciseMapTabulation(data, toConcurrentMap(keyFn, valueFn, sum),
- new ToMapAssertion<>(keyFn, valueFn, sum, ConcurrentHashMap.class));
-
- exerciseMapTabulation(data, toConcurrentMap(keyFn, valueFn, sum, ConcurrentSkipListMap::new),
- new ToMapAssertion<>(keyFn, valueFn, sum, ConcurrentSkipListMap.class));
- }
-
- @Test(dataProvider = "StreamTestData<Integer>", dataProviderClass = StreamTestDataProvider.class)
- public void testSimpleGroupBy(String name, TestData.OfRef<Integer> data) throws ReflectiveOperationException {
- Function<Integer, Integer> classifier = i -> i % 3;
-
- // Single-level groupBy
- exerciseMapTabulation(data, groupingBy(classifier),
- new GroupedMapAssertion<>(classifier, HashMap.class,
- new ListAssertion<>()));
- exerciseMapTabulation(data, groupingByConcurrent(classifier),
- new GroupedMapAssertion<>(classifier, ConcurrentHashMap.class,
- new ListAssertion<>()));
-
- // With explicit constructors
- exerciseMapTabulation(data,
- groupingBy(classifier, TreeMap::new, toCollection(HashSet::new)),
- new GroupedMapAssertion<>(classifier, TreeMap.class,
- new CollectionAssertion<Integer>(HashSet.class, false)));
- exerciseMapTabulation(data,
- groupingByConcurrent(classifier, ConcurrentSkipListMap::new,
- toCollection(HashSet::new)),
- new GroupedMapAssertion<>(classifier, ConcurrentSkipListMap.class,
- new CollectionAssertion<Integer>(HashSet.class, false)));
- }
-
- @Test(dataProvider = "StreamTestData<Integer>", dataProviderClass = StreamTestDataProvider.class)
- public void testTwoLevelGroupBy(String name, TestData.OfRef<Integer> data) throws ReflectiveOperationException {
- Function<Integer, Integer> classifier = i -> i % 6;
- Function<Integer, Integer> classifier2 = i -> i % 23;
-
- // Two-level groupBy
- exerciseMapTabulation(data,
- groupingBy(classifier, groupingBy(classifier2)),
- new GroupedMapAssertion<>(classifier, HashMap.class,
- new GroupedMapAssertion<>(classifier2, HashMap.class,
- new ListAssertion<>())));
- // with concurrent as upstream
- exerciseMapTabulation(data,
- groupingByConcurrent(classifier, groupingBy(classifier2)),
- new GroupedMapAssertion<>(classifier, ConcurrentHashMap.class,
- new GroupedMapAssertion<>(classifier2, HashMap.class,
- new ListAssertion<>())));
- // with concurrent as downstream
- exerciseMapTabulation(data,
- groupingBy(classifier, groupingByConcurrent(classifier2)),
- new GroupedMapAssertion<>(classifier, HashMap.class,
- new GroupedMapAssertion<>(classifier2, ConcurrentHashMap.class,
- new ListAssertion<>())));
- // with concurrent as upstream and downstream
- exerciseMapTabulation(data,
- groupingByConcurrent(classifier, groupingByConcurrent(classifier2)),
- new GroupedMapAssertion<>(classifier, ConcurrentHashMap.class,
- new GroupedMapAssertion<>(classifier2, ConcurrentHashMap.class,
- new ListAssertion<>())));
-
- // With explicit constructors
- exerciseMapTabulation(data,
- groupingBy(classifier, TreeMap::new, groupingBy(classifier2, TreeMap::new, toCollection(HashSet::new))),
- new GroupedMapAssertion<>(classifier, TreeMap.class,
- new GroupedMapAssertion<>(classifier2, TreeMap.class,
- new CollectionAssertion<Integer>(HashSet.class, false))));
- // with concurrent as upstream
- exerciseMapTabulation(data,
- groupingByConcurrent(classifier, ConcurrentSkipListMap::new, groupingBy(classifier2, TreeMap::new, toList())),
- new GroupedMapAssertion<>(classifier, ConcurrentSkipListMap.class,
- new GroupedMapAssertion<>(classifier2, TreeMap.class,
- new ListAssertion<>())));
- // with concurrent as downstream
- exerciseMapTabulation(data,
- groupingBy(classifier, TreeMap::new, groupingByConcurrent(classifier2, ConcurrentSkipListMap::new, toList())),
- new GroupedMapAssertion<>(classifier, TreeMap.class,
- new GroupedMapAssertion<>(classifier2, ConcurrentSkipListMap.class,
- new ListAssertion<>())));
- // with concurrent as upstream and downstream
- exerciseMapTabulation(data,
- groupingByConcurrent(classifier, ConcurrentSkipListMap::new, groupingByConcurrent(classifier2, ConcurrentSkipListMap::new, toList())),
- new GroupedMapAssertion<>(classifier, ConcurrentSkipListMap.class,
- new GroupedMapAssertion<>(classifier2, ConcurrentSkipListMap.class,
- new ListAssertion<>())));
- }
-
- @Test(dataProvider = "StreamTestData<Integer>", dataProviderClass = StreamTestDataProvider.class)
- public void testGroupedReduce(String name, TestData.OfRef<Integer> data) throws ReflectiveOperationException {
- Function<Integer, Integer> classifier = i -> i % 3;
-
- // Single-level simple reduce
- exerciseMapTabulation(data,
- groupingBy(classifier, reducing(0, Integer::sum)),
- new GroupedMapAssertion<>(classifier, HashMap.class,
- new ReduceAssertion<>(0, LambdaTestHelpers.identity(), Integer::sum)));
- // with concurrent
- exerciseMapTabulation(data,
- groupingByConcurrent(classifier, reducing(0, Integer::sum)),
- new GroupedMapAssertion<>(classifier, ConcurrentHashMap.class,
- new ReduceAssertion<>(0, LambdaTestHelpers.identity(), Integer::sum)));
-
- // With explicit constructors
- exerciseMapTabulation(data,
- groupingBy(classifier, TreeMap::new, reducing(0, Integer::sum)),
- new GroupedMapAssertion<>(classifier, TreeMap.class,
- new ReduceAssertion<>(0, LambdaTestHelpers.identity(), Integer::sum)));
- // with concurrent
- exerciseMapTabulation(data,
- groupingByConcurrent(classifier, ConcurrentSkipListMap::new, reducing(0, Integer::sum)),
- new GroupedMapAssertion<>(classifier, ConcurrentSkipListMap.class,
- new ReduceAssertion<>(0, LambdaTestHelpers.identity(), Integer::sum)));
-
- // Single-level map-reduce
- exerciseMapTabulation(data,
- groupingBy(classifier, reducing(0, mDoubler, Integer::sum)),
- new GroupedMapAssertion<>(classifier, HashMap.class,
- new ReduceAssertion<>(0, mDoubler, Integer::sum)));
- // with concurrent
- exerciseMapTabulation(data,
- groupingByConcurrent(classifier, reducing(0, mDoubler, Integer::sum)),
- new GroupedMapAssertion<>(classifier, ConcurrentHashMap.class,
- new ReduceAssertion<>(0, mDoubler, Integer::sum)));
-
- // With explicit constructors
- exerciseMapTabulation(data,
- groupingBy(classifier, TreeMap::new, reducing(0, mDoubler, Integer::sum)),
- new GroupedMapAssertion<>(classifier, TreeMap.class,
- new ReduceAssertion<>(0, mDoubler, Integer::sum)));
- // with concurrent
- exerciseMapTabulation(data,
- groupingByConcurrent(classifier, ConcurrentSkipListMap::new, reducing(0, mDoubler, Integer::sum)),
- new GroupedMapAssertion<>(classifier, ConcurrentSkipListMap.class,
- new ReduceAssertion<>(0, mDoubler, Integer::sum)));
- }
-
- @Test(dataProvider = "StreamTestData<Integer>", dataProviderClass = StreamTestDataProvider.class)
- public void testSimplePartition(String name, TestData.OfRef<Integer> data) throws ReflectiveOperationException {
- Predicate<Integer> classifier = i -> i % 3 == 0;
-
- // Single-level partition to downstream List
- exerciseMapTabulation(data,
- partitioningBy(classifier),
- new PartitionAssertion<>(classifier, new ListAssertion<>()));
- exerciseMapTabulation(data,
- partitioningBy(classifier, toList()),
- new PartitionAssertion<>(classifier, new ListAssertion<>()));
- }
-
- @Test(dataProvider = "StreamTestData<Integer>", dataProviderClass = StreamTestDataProvider.class)
- public void testTwoLevelPartition(String name, TestData.OfRef<Integer> data) throws ReflectiveOperationException {
- Predicate<Integer> classifier = i -> i % 3 == 0;
- Predicate<Integer> classifier2 = i -> i % 7 == 0;
-
- // Two level partition
- exerciseMapTabulation(data,
- partitioningBy(classifier, partitioningBy(classifier2)),
- new PartitionAssertion<>(classifier,
- new PartitionAssertion(classifier2, new ListAssertion<>())));
-
- // Two level partition with reduce
- exerciseMapTabulation(data,
- partitioningBy(classifier, reducing(0, Integer::sum)),
- new PartitionAssertion<>(classifier,
- new ReduceAssertion<>(0, LambdaTestHelpers.identity(), Integer::sum)));
- }
-
- @Test(dataProvider = "StreamTestData<Integer>", dataProviderClass = StreamTestDataProvider.class)
- public void testComposeFinisher(String name, TestData.OfRef<Integer> data) throws ReflectiveOperationException {
- List<Integer> asList = exerciseTerminalOps(data, s -> s.collect(toList()));
- List<Integer> asImmutableList = exerciseTerminalOps(data, s -> s.collect(collectingAndThen(toList(), Collections::unmodifiableList)));
- assertEquals(asList, asImmutableList);
- try {
- asImmutableList.add(0);
- fail("Expecting immutable result");
- }
- catch (UnsupportedOperationException ignored) { }
- }
-
-}