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/*
* Copyright (c) 2018, 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.
*/
/*
* @test
* @bug 8050818
* @run testng PredicateNotTest
*/
import java.util.List;
import java.util.function.Predicate;
import org.testng.annotations.Test;
import static java.util.function.Predicate.not;
import static java.util.stream.Collectors.joining;
import static org.testng.Assert.assertEquals;
import static org.testng.Assert.fail;
@Test(groups = "unit")
public class PredicateNotTest {
static class IsEmptyPredicate implements Predicate<String> {
@Override
public boolean test(String s) {
return s.isEmpty();
}
}
public void test() {
List<String> test = List.of(
"A non-empty line",
"",
"A non-empty line",
"",
"A non-empty line",
"",
"A non-empty line",
""
);
String expected = "A non-empty line\nA non-empty line\nA non-empty line\nA non-empty line";
assertEquals(test.stream().filter(not(String::isEmpty)).collect(joining("\n")), expected);
assertEquals(test.stream().filter(not(s -> s.isEmpty())).collect(joining("\n")), expected);
assertEquals(test.stream().filter(not(new IsEmptyPredicate())).collect(joining("\n")), expected);
assertEquals(test.stream().filter(not(not(not(String::isEmpty)))).collect(joining("\n")), expected);
assertEquals(test.stream().filter(not(not(not(s -> s.isEmpty())))).collect(joining("\n")), expected);
assertEquals(test.stream().filter(not(not(not(new IsEmptyPredicate())))).collect(joining("\n")), expected);
}
}
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