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 org.openjdk.testlib.java.util.stream.OpTestCase; 26 import org.openjdk.testlib.java.util.stream.StreamTestDataProvider; 27 import org.openjdk.testlib.java.util.stream.TestData; 28 29 import java.util.stream.Stream; 30 import org.testng.annotations.Test; 31 32 import java.util.List; 33 import java.util.Optional; 34 35 import static org.openjdk.testlib.java.util.stream.LambdaTestHelpers.*; 36 37 /** 38 * ReduceOpTest 39 * 40 * @author Brian Goetz 41 */ 42 @Test 43 public class ReduceTest extends OpTestCase { testReduce()44 public void testReduce() { 45 List<Integer> list = countTo(10); 46 47 assertEquals(55, (int) list.stream().reduce(rPlus).get()); 48 assertEquals(55, (int) list.stream().reduce(0, rPlus)); 49 assertEquals(10, (int) list.stream().reduce(rMax).get()); 50 assertEquals(1, (int) list.stream().reduce(rMin).get()); 51 52 assertEquals(0, (int) countTo(0).stream().reduce(0, rPlus)); 53 assertTrue(!countTo(0).stream().reduce(rPlus).isPresent()); 54 55 assertEquals(110, (int) list.stream().map(mDoubler).reduce(rPlus).get()); 56 assertEquals(20, (int) list.stream().map(mDoubler).reduce(rMax).get()); 57 assertEquals(2, (int) list.stream().map(mDoubler).reduce(rMin).get()); 58 } 59 60 @Test(dataProvider = "StreamTestData<Integer>", dataProviderClass = StreamTestDataProvider.class) testOps(String name, TestData.OfRef<Integer> data)61 public void testOps(String name, TestData.OfRef<Integer> data) { 62 assertEquals(0, (int) exerciseTerminalOps(data, s -> s.filter(pFalse), s -> s.reduce(0, rPlus, rPlus))); 63 64 Optional<Integer> seedless = exerciseTerminalOps(data, s -> s.reduce(rPlus)); 65 Integer folded = exerciseTerminalOps(data, s -> s.reduce(0, rPlus, rPlus)); 66 assertEquals(folded, seedless.orElse(0)); 67 68 seedless = exerciseTerminalOps(data, s -> s.reduce(rMin)); 69 folded = exerciseTerminalOps(data, s -> s.reduce(Integer.MAX_VALUE, rMin, rMin)); 70 assertEquals(folded, seedless.orElse(Integer.MAX_VALUE)); 71 72 seedless = exerciseTerminalOps(data, s -> s.reduce(rMax)); 73 folded = exerciseTerminalOps(data, s -> s.reduce(Integer.MIN_VALUE, rMax, rMax)); 74 assertEquals(folded, seedless.orElse(Integer.MIN_VALUE)); 75 76 seedless = exerciseTerminalOps(data, s -> s.map(mDoubler), s -> s.reduce(rPlus)); 77 folded = exerciseTerminalOps(data, s -> s.map(mDoubler), s -> s.reduce(0, rPlus, rPlus)); 78 assertEquals(folded, seedless.orElse(0)); 79 80 seedless = exerciseTerminalOps(data, s -> s.map(mDoubler), s -> s.reduce(rMin)); 81 folded = exerciseTerminalOps(data, s -> s.map(mDoubler), s -> s.reduce(Integer.MAX_VALUE, rMin, rMin)); 82 assertEquals(folded, seedless.orElse(Integer.MAX_VALUE)); 83 84 seedless = exerciseTerminalOps(data, s -> s.map(mDoubler), s -> s.reduce(rMax)); 85 folded = exerciseTerminalOps(data, s -> s.map(mDoubler), s -> s.reduce(Integer.MIN_VALUE, rMax, rMax)); 86 assertEquals(folded, seedless.orElse(Integer.MIN_VALUE)); 87 } 88 } 89