1 /*
   2  * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 /*
  25  * @test
  26  * @summary flat-map operations
  27  * @bug 8044047 8076458
  28  */
  29 
  30 package org.openjdk.tests.java.util.stream;
  31 
  32 import org.testng.annotations.Test;
  33 
  34 import java.util.Collection;
  35 import java.util.Collections;
  36 import java.util.concurrent.atomic.AtomicInteger;
  37 import java.util.stream.DoubleStream;
  38 import java.util.stream.DoubleStreamTestDataProvider;
  39 import java.util.stream.IntStream;
  40 import java.util.stream.OpTestCase;
  41 import java.util.stream.TestData;
  42 
  43 import static java.util.stream.LambdaTestHelpers.*;
  44 import static java.util.stream.ThowableHelper.checkNPE;
  45 
  46 @Test
  47 public class FlatMapDoubleOpTest extends OpTestCase {
  48 
  49     @Test
  50     public void testDoubleClose() {
  51         AtomicInteger before = new AtomicInteger();
  52         AtomicInteger onClose = new AtomicInteger();
  53 
  54         DoubleStream.of(1, 2).peek(e -> before.getAndIncrement()).
  55                 flatMap(i -> DoubleStream.of(i, i).onClose(onClose::getAndIncrement)).count();
  56         assertEquals(before.get(), onClose.get());
  57     }
  58 
  59     @Test(dataProvider = "DoubleStreamTestData", dataProviderClass = DoubleStreamTestDataProvider.class)
  60     public void testDoubleOps(String name, TestData.OfDouble data) {
  61         Collection<Double> result = exerciseOps(data, s -> s.flatMap(i -> Collections.singleton(i).stream().mapToDouble(j -> j)));
  62         assertEquals(data.size(), result.size());
  63         assertContents(data, result);
  64 
  65         result = exerciseOps(data, s -> DoubleStream.empty());
  66         assertEquals(0, result.size());
  67 
  68         exerciseOps(data, s -> s.flatMap(e -> IntStream.range(0, (int) e).asDoubleStream()));
  69         exerciseOps(data, s -> s.flatMap(e -> IntStream.range(0, (int) e).limit(10).asDoubleStream()));
  70     }
  71 }