|
Java example source code file (ConcatTest.java)
This example Java source code file (ConcatTest.java) is included in the alvinalexander.com
"Java Source Code
Warehouse" project. The intent of this project is to help you "Learn
Java by Example" TM.
Learn more about this Java project at its project page.
The ConcatTest.java Java example source code
/*
* Copyright (c) 2012, 2013, 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.
*/
package org.openjdk.tests.java.util.stream;
import org.testng.annotations.DataProvider;
import org.testng.annotations.Factory;
import org.testng.annotations.Test;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.LinkedHashSet;
import java.util.LinkedList;
import java.util.List;
import java.util.Spliterator;
import java.util.TreeSet;
import java.util.stream.DoubleStream;
import java.util.stream.IntStream;
import java.util.stream.LongStream;
import java.util.stream.Stream;
import static java.util.stream.LambdaTestHelpers.*;
import static org.testng.Assert.*;
@Test
public class ConcatTest {
private static Object[][] cases;
static {
List<Integer> part1 = Arrays.asList(5, 3, 4, 1, 2, 6, 2, 4);
List<Integer> part2 = Arrays.asList(8, 8, 6, 6, 9, 7, 10, 9);
List<Integer> p1p2 = Arrays.asList(5, 3, 4, 1, 2, 6, 2, 4, 8, 8, 6, 6, 9, 7, 10, 9);
List<Integer> p2p1 = Arrays.asList(8, 8, 6, 6, 9, 7, 10, 9, 5, 3, 4, 1, 2, 6, 2, 4);
List<Integer> empty = new LinkedList<>(); // To be ordered
assertTrue(empty.isEmpty());
LinkedHashSet<Integer> distinctP1 = new LinkedHashSet<>(part1);
LinkedHashSet<Integer> distinctP2 = new LinkedHashSet<>(part2);
TreeSet<Integer> sortedP1 = new TreeSet<>(part1);
TreeSet<Integer> sortedP2 = new TreeSet<>(part2);
cases = new Object[][] {
{ "regular", part1, part2, p1p2 },
{ "reverse regular", part2, part1, p2p1 },
{ "front distinct", distinctP1, part2, Arrays.asList(5, 3, 4, 1, 2, 6, 8, 8, 6, 6, 9, 7, 10, 9) },
{ "back distinct", part1, distinctP2, Arrays.asList(5, 3, 4, 1, 2, 6, 2, 4, 8, 6, 9, 7, 10) },
{ "both distinct", distinctP1, distinctP2, Arrays.asList(5, 3, 4, 1, 2, 6, 8, 6, 9, 7, 10) },
{ "front sorted", sortedP1, part2, Arrays.asList(1, 2, 3, 4, 5, 6, 8, 8, 6, 6, 9, 7, 10, 9) },
{ "back sorted", part1, sortedP2, Arrays.asList(5, 3, 4, 1, 2, 6, 2, 4, 6, 7, 8, 9, 10) },
{ "both sorted", sortedP1, sortedP2, Arrays.asList(1, 2, 3, 4, 5, 6, 6, 7, 8, 9, 10) },
{ "reverse both sorted", sortedP2, sortedP1, Arrays.asList(6, 7, 8, 9, 10, 1, 2, 3, 4, 5, 6) },
{ "empty something", empty, part1, part1 },
{ "something empty", part1, empty, part1 },
{ "empty empty", empty, empty, empty }
};
}
@DataProvider(name = "cases")
private static Object[][] getCases() {
return cases;
}
@Factory(dataProvider = "cases")
public static Object[] createTests(String scenario, Collection<Integer> c1, Collection c2, Collection expected) {
return new Object[] {
new ConcatTest(scenario, c1, c2, expected)
};
}
protected final String scenario;
protected final Collection<Integer> c1;
protected final Collection<Integer> c2;
protected final Collection<Integer> expected;
public ConcatTest(String scenario, Collection<Integer> c1, Collection c2, Collection expected) {
this.scenario = scenario;
this.c1 = c1;
this.c2 = c2;
this.expected = expected;
// verify prerequisite
Stream<Integer> s1s = c1.stream();
Stream<Integer> s2s = c2.stream();
Stream<Integer> s1p = c1.parallelStream();
Stream<Integer> s2p = c2.parallelStream();
assertTrue(s1p.isParallel());
assertTrue(s2p.isParallel());
assertFalse(s1s.isParallel());
assertFalse(s2s.isParallel());
assertTrue(s1s.spliterator().hasCharacteristics(Spliterator.ORDERED));
assertTrue(s1p.spliterator().hasCharacteristics(Spliterator.ORDERED));
assertTrue(s2s.spliterator().hasCharacteristics(Spliterator.ORDERED));
assertTrue(s2p.spliterator().hasCharacteristics(Spliterator.ORDERED));
}
private <T> void assertConcatContent(Spliterator sp, boolean ordered, Spliterator expected) {
// concat stream cannot guarantee uniqueness
assertFalse(sp.hasCharacteristics(Spliterator.DISTINCT), scenario);
// concat stream cannot guarantee sorted
assertFalse(sp.hasCharacteristics(Spliterator.SORTED), scenario);
// concat stream is ordered if both are ordered
assertEquals(sp.hasCharacteristics(Spliterator.ORDERED), ordered, scenario);
// Verify elements
if (ordered) {
assertEquals(toBoxedList(sp),
toBoxedList(expected),
scenario);
} else {
assertEquals(toBoxedMultiset(sp),
toBoxedMultiset(expected),
scenario);
}
}
private void assertRefConcat(Stream<Integer> s1, Stream s2, boolean parallel, boolean ordered) {
Stream<Integer> result = Stream.concat(s1, s2);
assertEquals(result.isParallel(), parallel);
assertConcatContent(result.spliterator(), ordered, expected.spliterator());
}
private void assertIntConcat(Stream<Integer> s1, Stream s2, boolean parallel, boolean ordered) {
IntStream result = IntStream.concat(s1.mapToInt(Integer::intValue),
s2.mapToInt(Integer::intValue));
assertEquals(result.isParallel(), parallel);
assertConcatContent(result.spliterator(), ordered,
expected.stream().mapToInt(Integer::intValue).spliterator());
}
private void assertLongConcat(Stream<Integer> s1, Stream s2, boolean parallel, boolean ordered) {
LongStream result = LongStream.concat(s1.mapToLong(Integer::longValue),
s2.mapToLong(Integer::longValue));
assertEquals(result.isParallel(), parallel);
assertConcatContent(result.spliterator(), ordered,
expected.stream().mapToLong(Integer::longValue).spliterator());
}
private void assertDoubleConcat(Stream<Integer> s1, Stream s2, boolean parallel, boolean ordered) {
DoubleStream result = DoubleStream.concat(s1.mapToDouble(Integer::doubleValue),
s2.mapToDouble(Integer::doubleValue));
assertEquals(result.isParallel(), parallel);
assertConcatContent(result.spliterator(), ordered,
expected.stream().mapToDouble(Integer::doubleValue).spliterator());
}
public void testRefConcat() {
// sequential + sequential -> sequential
assertRefConcat(c1.stream(), c2.stream(), false, true);
// parallel + parallel -> parallel
assertRefConcat(c1.parallelStream(), c2.parallelStream(), true, true);
// sequential + parallel -> parallel
assertRefConcat(c1.stream(), c2.parallelStream(), true, true);
// parallel + sequential -> parallel
assertRefConcat(c1.parallelStream(), c2.stream(), true, true);
// not ordered
assertRefConcat(c1.stream().unordered(), c2.stream(), false, false);
assertRefConcat(c1.stream(), c2.stream().unordered(), false, false);
assertRefConcat(c1.parallelStream().unordered(), c2.stream().unordered(), true, false);
}
public void testIntConcat() {
// sequential + sequential -> sequential
assertIntConcat(c1.stream(), c2.stream(), false, true);
// parallel + parallel -> parallel
assertIntConcat(c1.parallelStream(), c2.parallelStream(), true, true);
// sequential + parallel -> parallel
assertIntConcat(c1.stream(), c2.parallelStream(), true, true);
// parallel + sequential -> parallel
assertIntConcat(c1.parallelStream(), c2.stream(), true, true);
// not ordered
assertIntConcat(c1.stream().unordered(), c2.stream(), false, false);
assertIntConcat(c1.stream(), c2.stream().unordered(), false, false);
assertIntConcat(c1.parallelStream().unordered(), c2.stream().unordered(), true, false);
}
public void testLongConcat() {
// sequential + sequential -> sequential
assertLongConcat(c1.stream(), c2.stream(), false, true);
// parallel + parallel -> parallel
assertLongConcat(c1.parallelStream(), c2.parallelStream(), true, true);
// sequential + parallel -> parallel
assertLongConcat(c1.stream(), c2.parallelStream(), true, true);
// parallel + sequential -> parallel
assertLongConcat(c1.parallelStream(), c2.stream(), true, true);
// not ordered
assertLongConcat(c1.stream().unordered(), c2.stream(), false, false);
assertLongConcat(c1.stream(), c2.stream().unordered(), false, false);
assertLongConcat(c1.parallelStream().unordered(), c2.stream().unordered(), true, false);
}
public void testDoubleConcat() {
// sequential + sequential -> sequential
assertDoubleConcat(c1.stream(), c2.stream(), false, true);
// parallel + parallel -> parallel
assertDoubleConcat(c1.parallelStream(), c2.parallelStream(), true, true);
// sequential + parallel -> parallel
assertDoubleConcat(c1.stream(), c2.parallelStream(), true, true);
// parallel + sequential -> parallel
assertDoubleConcat(c1.parallelStream(), c2.stream(), true, true);
// not ordered
assertDoubleConcat(c1.stream().unordered(), c2.stream(), false, false);
assertDoubleConcat(c1.stream(), c2.stream().unordered(), false, false);
assertDoubleConcat(c1.parallelStream().unordered(), c2.stream().unordered(), true, false);
}
}
Other Java examples (source code examples)
Here is a short list of links related to this Java ConcatTest.java source code file:
|