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*
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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;
}
}