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* version 2 for more details (a copy is included in the LICENSE file that
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*
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* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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/*
* @test
* @summary flat-map operations
* @bug 8044047 8076458
*/
package org.openjdk.tests.java.util.stream;
import org.testng.annotations.Test;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.function.Function;
import java.util.function.Supplier;
import java.util.stream.DoubleStream;
import java.util.stream.DoubleStreamTestDataProvider;
import java.util.stream.IntStream;
import java.util.stream.IntStreamTestDataProvider;
import java.util.stream.LongStream;
import java.util.stream.LongStreamTestDataProvider;
import java.util.stream.OpTestCase;
import java.util.stream.Stream;
import java.util.stream.StreamTestDataProvider;
import java.util.stream.TestData;
import static java.util.stream.LambdaTestHelpers.*;
import static java.util.stream.ThrowableHelper.checkNPE;
@Test
public class FlatMapOpTest extends OpTestCase {
public void testNullMapper() {
checkNPE(() -> Stream.of(1).flatMap(null));
checkNPE(() -> IntStream.of(1).flatMap(null));
checkNPE(() -> LongStream.of(1).flatMap(null));
checkNPE(() -> DoubleStream.of(1).flatMap(null));
}
static final Function<Integer, Stream<Integer>> integerRangeMapper
= e -> IntStream.range(0, e).boxed();
public void testFlatMap() {
String[] stringsArray = {"hello", "there", "", "yada"};
Stream<String> strings = Arrays.asList(stringsArray).stream();
assertConcat(strings.flatMap(flattenChars).iterator(), "hellothereyada");
assertCountSum(countTo(10).stream().flatMap(mfId), 10, 55);
assertCountSum(countTo(10).stream().flatMap(mfNull), 0, 0);
assertCountSum(countTo(3).stream().flatMap(mfLt), 6, 4);
exerciseOps(TestData.Factory.ofArray("stringsArray", stringsArray), s -> s.flatMap(flattenChars));
exerciseOps(TestData.Factory.ofArray("LONG_STRING", new String[] {LONG_STRING}), s -> s.flatMap(flattenChars));
}
@Test
public void testClose() {
AtomicInteger before = new AtomicInteger();
AtomicInteger onClose = new AtomicInteger();
Supplier<Stream<Integer>> s = () -> {
before.set(0); onClose.set(0);
return Stream.of(1, 2).peek(e -> before.getAndIncrement());
};
s.get().flatMap(i -> Stream.of(i, i).onClose(onClose::getAndIncrement)).count();
assertEquals(before.get(), onClose.get());
s.get().flatMapToInt(i -> IntStream.of(i, i).onClose(onClose::getAndIncrement)).count();
assertEquals(before.get(), onClose.get());
s.get().flatMapToLong(i -> LongStream.of(i, i).onClose(onClose::getAndIncrement)).count();
assertEquals(before.get(), onClose.get());
s.get().flatMapToDouble(i -> DoubleStream.of(i, i).onClose(onClose::getAndIncrement)).count();
assertEquals(before.get(), onClose.get());
}
@Test
public void testIntClose() {
AtomicInteger before = new AtomicInteger();
AtomicInteger onClose = new AtomicInteger();
IntStream.of(1, 2).peek(e -> before.getAndIncrement()).
flatMap(i -> IntStream.of(i, i).onClose(onClose::getAndIncrement)).count();
assertEquals(before.get(), onClose.get());
}
@Test
public void testLongClose() {
AtomicInteger before = new AtomicInteger();
AtomicInteger onClose = new AtomicInteger();
LongStream.of(1, 2).peek(e -> before.getAndIncrement()).
flatMap(i -> LongStream.of(i, i).onClose(onClose::getAndIncrement)).count();
assertEquals(before.get(), onClose.get());
}
@Test
public void testDoubleClose() {
AtomicInteger before = new AtomicInteger();
AtomicInteger onClose = new AtomicInteger();
DoubleStream.of(1, 2).peek(e -> before.getAndIncrement()).
flatMap(i -> DoubleStream.of(i, i).onClose(onClose::getAndIncrement)).count();
assertEquals(before.get(), onClose.get());
}
@Test(dataProvider = "StreamTestData<Integer>", dataProviderClass = StreamTestDataProvider.class)
public void testOps(String name, TestData.OfRef<Integer> data) {
Collection<Integer> result = exerciseOps(data, s -> s.flatMap(mfId));
assertEquals(data.size(), result.size());
result = exerciseOps(data, s -> s.flatMap(mfNull));
assertEquals(0, result.size());
result = exerciseOps(data, s-> s.flatMap(e -> Stream.empty()));
assertEquals(0, result.size());
}
@Test(dataProvider = "StreamTestData<Integer>.small", dataProviderClass = StreamTestDataProvider.class)
public void testOpsX(String name, TestData.OfRef<Integer> data) {
exerciseOps(data, s -> s.flatMap(mfLt));
exerciseOps(data, s -> s.flatMap(integerRangeMapper));
exerciseOps(data, s -> s.flatMap((Integer e) -> IntStream.range(0, e).boxed().limit(10)));
}
//
@Test(dataProvider = "IntStreamTestData", dataProviderClass = IntStreamTestDataProvider.class)
public void testIntOps(String name, TestData.OfInt data) {
Collection<Integer> result = exerciseOps(data, s -> s.flatMap(i -> Collections.singleton(i).stream().mapToInt(j -> j)));
assertEquals(data.size(), result.size());
assertContents(data, result);
result = exerciseOps(data, s -> s.flatMap(i -> IntStream.empty()));
assertEquals(0, result.size());
}
@Test(dataProvider = "IntStreamTestData.small", dataProviderClass = IntStreamTestDataProvider.class)
public void testIntOpsX(String name, TestData.OfInt data) {
exerciseOps(data, s -> s.flatMap(e -> IntStream.range(0, e)));
exerciseOps(data, s -> s.flatMap(e -> IntStream.range(0, e).limit(10)));
}
//
@Test(dataProvider = "LongStreamTestData", dataProviderClass = LongStreamTestDataProvider.class)
public void testLongOps(String name, TestData.OfLong data) {
Collection<Long> result = exerciseOps(data, s -> s.flatMap(i -> Collections.singleton(i).stream().mapToLong(j -> j)));
assertEquals(data.size(), result.size());
assertContents(data, result);
result = exerciseOps(data, s -> LongStream.empty());
assertEquals(0, result.size());
}
@Test(dataProvider = "LongStreamTestData.small", dataProviderClass = LongStreamTestDataProvider.class)
public void testLongOpsX(String name, TestData.OfLong data) {
exerciseOps(data, s -> s.flatMap(e -> LongStream.range(0, e)));
exerciseOps(data, s -> s.flatMap(e -> LongStream.range(0, e).limit(10)));
}
//
@Test(dataProvider = "DoubleStreamTestData", dataProviderClass = DoubleStreamTestDataProvider.class)
public void testDoubleOps(String name, TestData.OfDouble data) {
Collection<Double> result = exerciseOps(data, s -> s.flatMap(i -> Collections.singleton(i).stream().mapToDouble(j -> j)));
assertEquals(data.size(), result.size());
assertContents(data, result);
result = exerciseOps(data, s -> DoubleStream.empty());
assertEquals(0, result.size());
}
@Test(dataProvider = "DoubleStreamTestData.small", dataProviderClass = DoubleStreamTestDataProvider.class)
public void testDoubleOpsX(String name, TestData.OfDouble data) {
exerciseOps(data, s -> s.flatMap(e -> IntStream.range(0, (int) e).asDoubleStream()));
exerciseOps(data, s -> s.flatMap(e -> IntStream.range(0, (int) e).limit(10).asDoubleStream()));
}
}