ojluni/src/test/java/util/stream/test/org/openjdk/tests/java/util/stream/ExplodeOpTest.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * This code is free software; you can redistribute it and/or modify it
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * 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.
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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.function.Function;
import java.util.stream.*;

import static java.util.stream.LambdaTestHelpers.*;

/**
 * ExplodeOpTest
 *
 * @author Brian Goetz
 */
@Test
public class ExplodeOpTest extends OpTestCase {

    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(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());

        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());

        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());

        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());

        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()));
    }
}