test/jdk/java/util/stream/test/org/openjdk/tests/java/util/stream/FlatMapOpTest.java - platform/libcore - Git at Google

 /*
  * Copyright (c) 2012, 2017, 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.
  */

 /*
  * @test
  * @summary flat-map operations
  * @bug 8044047 8076458 8075939
  */

 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 {

     @Test
     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();

     @Test
     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
     public void testOpsShortCircuit() {
         AtomicInteger count = new AtomicInteger();
         Stream.of(0).flatMap(i -> IntStream.range(0, 100).boxed()).
                 peek(i -> count.incrementAndGet()).
                 limit(10).toArray();
         assertEquals(count.get(), 10);
     }

     //

     @Test(dataProvider = "IntStreamTestData", dataProviderClass = IntStreamTestDataProvider.class)
     public void testIntOps(String name, TestData.OfInt data) {
         Collection<Integer> result = exerciseOps(data, s -> s.flatMap(IntStream::of));
         assertEquals(data.size(), result.size());
         assertContents(data, result);

         result = exerciseOps(data, s -> s.boxed().flatMapToInt(IntStream::of));
         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)));

         exerciseOps(data, s -> s.boxed().flatMapToInt(e -> IntStream.range(0, e)));
         exerciseOps(data, s -> s.boxed().flatMapToInt(e -> IntStream.range(0, e).limit(10)));
     }

     @Test
     public void testIntOpsShortCircuit() {
         AtomicInteger count = new AtomicInteger();
         IntStream.of(0).flatMap(i -> IntStream.range(0, 100)).
                 peek(i -> count.incrementAndGet()).
                 limit(10).toArray();
         assertEquals(count.get(), 10);

         count.set(0);
         Stream.of(0).flatMapToInt(i -> IntStream.range(0, 100)).
                 peek(i -> count.incrementAndGet()).
                 limit(10).toArray();
         assertEquals(count.get(), 10);
     }

     //

     @Test(dataProvider = "LongStreamTestData", dataProviderClass = LongStreamTestDataProvider.class)
     public void testLongOps(String name, TestData.OfLong data) {
         Collection<Long> result = exerciseOps(data, s -> s.flatMap(LongStream::of));
         assertEquals(data.size(), result.size());
         assertContents(data, result);

         result = exerciseOps(data, s -> s.boxed().flatMapToLong(LongStream::of));
         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
     public void testLongOpsShortCircuit() {
         AtomicInteger count = new AtomicInteger();
         LongStream.of(0).flatMap(i -> LongStream.range(0, 100)).
                 peek(i -> count.incrementAndGet()).
                 limit(10).toArray();
         assertEquals(count.get(), 10);

         count.set(0);
         Stream.of(0).flatMapToLong(i -> LongStream.range(0, 100)).
                 peek(i -> count.incrementAndGet()).
                 limit(10).toArray();
         assertEquals(count.get(), 10);
     }

     //

     @Test(dataProvider = "DoubleStreamTestData", dataProviderClass = DoubleStreamTestDataProvider.class)
     public void testDoubleOps(String name, TestData.OfDouble data) {
         Collection<Double> result = exerciseOps(data, s -> s.flatMap(DoubleStream::of));
         assertEquals(data.size(), result.size());
         assertContents(data, result);

         result = exerciseOps(data, s -> s.boxed().flatMapToDouble(DoubleStream::of));
         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()));
     }

     @Test
     public void testDoubleOpsShortCircuit() {
         AtomicInteger count = new AtomicInteger();
         DoubleStream.of(0).flatMap(i -> IntStream.range(0, 100).asDoubleStream()).
                 peek(i -> count.incrementAndGet()).
                 limit(10).toArray();
         assertEquals(count.get(), 10);

         count.set(0);
         Stream.of(0).flatMapToDouble(i -> IntStream.range(0, 100).asDoubleStream()).
                 peek(i -> count.incrementAndGet()).
                 limit(10).toArray();
         assertEquals(count.get(), 10);
     }
 }
	/*
	* Copyright (c) 2012, 2017, 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.
	*/

	/*
	* @test
	* @summary flat-map operations
	* @bug 8044047 8076458 8075939
	*/

	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 {

	@Test
	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();

	@Test
	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
	public void testOpsShortCircuit() {
	AtomicInteger count = new AtomicInteger();
	Stream.of(0).flatMap(i -> IntStream.range(0, 100).boxed()).
	peek(i -> count.incrementAndGet()).
	limit(10).toArray();
	assertEquals(count.get(), 10);
	}

	//

	@Test(dataProvider = "IntStreamTestData", dataProviderClass = IntStreamTestDataProvider.class)
	public void testIntOps(String name, TestData.OfInt data) {
	Collection<Integer> result = exerciseOps(data, s -> s.flatMap(IntStream::of));
	assertEquals(data.size(), result.size());
	assertContents(data, result);

	result = exerciseOps(data, s -> s.boxed().flatMapToInt(IntStream::of));
	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)));

	exerciseOps(data, s -> s.boxed().flatMapToInt(e -> IntStream.range(0, e)));
	exerciseOps(data, s -> s.boxed().flatMapToInt(e -> IntStream.range(0, e).limit(10)));
	}

	@Test
	public void testIntOpsShortCircuit() {
	AtomicInteger count = new AtomicInteger();
	IntStream.of(0).flatMap(i -> IntStream.range(0, 100)).
	peek(i -> count.incrementAndGet()).
	limit(10).toArray();
	assertEquals(count.get(), 10);

	count.set(0);
	Stream.of(0).flatMapToInt(i -> IntStream.range(0, 100)).
	peek(i -> count.incrementAndGet()).
	limit(10).toArray();
	assertEquals(count.get(), 10);
	}

	//

	@Test(dataProvider = "LongStreamTestData", dataProviderClass = LongStreamTestDataProvider.class)
	public void testLongOps(String name, TestData.OfLong data) {
	Collection<Long> result = exerciseOps(data, s -> s.flatMap(LongStream::of));
	assertEquals(data.size(), result.size());
	assertContents(data, result);

	result = exerciseOps(data, s -> s.boxed().flatMapToLong(LongStream::of));
	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
	public void testLongOpsShortCircuit() {
	AtomicInteger count = new AtomicInteger();
	LongStream.of(0).flatMap(i -> LongStream.range(0, 100)).
	peek(i -> count.incrementAndGet()).
	limit(10).toArray();
	assertEquals(count.get(), 10);

	count.set(0);
	Stream.of(0).flatMapToLong(i -> LongStream.range(0, 100)).
	peek(i -> count.incrementAndGet()).
	limit(10).toArray();
	assertEquals(count.get(), 10);
	}

	//

	@Test(dataProvider = "DoubleStreamTestData", dataProviderClass = DoubleStreamTestDataProvider.class)
	public void testDoubleOps(String name, TestData.OfDouble data) {
	Collection<Double> result = exerciseOps(data, s -> s.flatMap(DoubleStream::of));
	assertEquals(data.size(), result.size());
	assertContents(data, result);

	result = exerciseOps(data, s -> s.boxed().flatMapToDouble(DoubleStream::of));
	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()));
	}

	@Test
	public void testDoubleOpsShortCircuit() {
	AtomicInteger count = new AtomicInteger();
	DoubleStream.of(0).flatMap(i -> IntStream.range(0, 100).asDoubleStream()).
	peek(i -> count.incrementAndGet()).
	limit(10).toArray();
	assertEquals(count.get(), 10);

	count.set(0);
	Stream.of(0).flatMapToDouble(i -> IntStream.range(0, 100).asDoubleStream()).
	peek(i -> count.incrementAndGet()).
	limit(10).toArray();
	assertEquals(count.get(), 10);
	}
	}