1 /* 2 * Copyright (c) 2012, 2013, 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 package org.openjdk.tests.java.util.stream; 24 25 import java.util.stream.OpTestCase; 26 import java.util.stream.Stream; 27 import java.util.stream.StreamTestDataProvider; 28 import org.testng.annotations.Test; 29 30 import java.util.List; 31 import java.util.Optional; 32 import java.util.stream.TestData; 33 34 import static java.util.stream.LambdaTestHelpers.*; 35 36 /** 37 * ReduceOpTest 38 * 39 * @author Brian Goetz 40 */ 41 @Test 42 public class ReduceTest extends OpTestCase { testReduce()43 public void testReduce() { 44 List<Integer> list = countTo(10); 45 46 assertEquals(55, (int) list.stream().reduce(rPlus).get()); 47 assertEquals(55, (int) list.stream().reduce(0, rPlus)); 48 assertEquals(10, (int) list.stream().reduce(rMax).get()); 49 assertEquals(1, (int) list.stream().reduce(rMin).get()); 50 51 assertEquals(0, (int) countTo(0).stream().reduce(0, rPlus)); 52 assertTrue(!countTo(0).stream().reduce(rPlus).isPresent()); 53 54 assertEquals(110, (int) list.stream().map(mDoubler).reduce(rPlus).get()); 55 assertEquals(20, (int) list.stream().map(mDoubler).reduce(rMax).get()); 56 assertEquals(2, (int) list.stream().map(mDoubler).reduce(rMin).get()); 57 } 58 59 @Test(dataProvider = "StreamTestData<Integer>", dataProviderClass = StreamTestDataProvider.class) testOps(String name, TestData.OfRef<Integer> data)60 public void testOps(String name, TestData.OfRef<Integer> data) { 61 assertEquals(0, (int) exerciseTerminalOps(data, s -> s.filter(pFalse), s -> s.reduce(0, rPlus, rPlus))); 62 63 Optional<Integer> seedless = exerciseTerminalOps(data, s -> s.reduce(rPlus)); 64 Integer folded = exerciseTerminalOps(data, s -> s.reduce(0, rPlus, rPlus)); 65 assertEquals(folded, seedless.orElse(0)); 66 67 seedless = exerciseTerminalOps(data, s -> s.reduce(rMin)); 68 folded = exerciseTerminalOps(data, s -> s.reduce(Integer.MAX_VALUE, rMin, rMin)); 69 assertEquals(folded, seedless.orElse(Integer.MAX_VALUE)); 70 71 seedless = exerciseTerminalOps(data, s -> s.reduce(rMax)); 72 folded = exerciseTerminalOps(data, s -> s.reduce(Integer.MIN_VALUE, rMax, rMax)); 73 assertEquals(folded, seedless.orElse(Integer.MIN_VALUE)); 74 75 seedless = exerciseTerminalOps(data, s -> s.map(mDoubler), s -> s.reduce(rPlus)); 76 folded = exerciseTerminalOps(data, s -> s.map(mDoubler), s -> s.reduce(0, rPlus, rPlus)); 77 assertEquals(folded, seedless.orElse(0)); 78 79 seedless = exerciseTerminalOps(data, s -> s.map(mDoubler), s -> s.reduce(rMin)); 80 folded = exerciseTerminalOps(data, s -> s.map(mDoubler), s -> s.reduce(Integer.MAX_VALUE, rMin, rMin)); 81 assertEquals(folded, seedless.orElse(Integer.MAX_VALUE)); 82 83 seedless = exerciseTerminalOps(data, s -> s.map(mDoubler), s -> s.reduce(rMax)); 84 folded = exerciseTerminalOps(data, s -> s.map(mDoubler), s -> s.reduce(Integer.MIN_VALUE, rMax, rMax)); 85 assertEquals(folded, seedless.orElse(Integer.MIN_VALUE)); 86 } 87 } 88