| /* |
| * Copyright (c) 2013, 2014, 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 |
| * @summary Comparator API narrowing type test |
| * @bug 8009736 8033590 |
| * @run testng TypeTest |
| */ |
| |
| import java.util.function.Function; |
| import java.util.Map; |
| import java.util.TreeMap; |
| import java.util.Comparator; |
| import org.testng.annotations.Test; |
| |
| import static org.testng.Assert.assertTrue; |
| |
| @Test(groups = "unit") |
| public class TypeTest { |
| static class Person { |
| String name; |
| static Comparator<Person> C = (p1, p2) -> p1.name.compareTo(p2.name); |
| |
| Person(String name) { |
| this.name = name; |
| } |
| |
| String getName() { return name; } |
| } |
| |
| static class Employee extends Person { |
| int id; |
| static Comparator<Employee> C = (e1, e2) -> e1.id - e2.id; |
| |
| Employee(int id, String name) { |
| super(name); |
| this.id = id; |
| } |
| } |
| |
| static class Manager extends Employee { |
| long reports; |
| static Comparator<Manager> C = (e1, e2) -> (int) (e1.reports - e2.reports); |
| |
| Manager(String name, int id, long reports) { |
| super(id, name); |
| this.reports = reports; |
| } |
| } |
| |
| static class Department { |
| Manager mgr; |
| String hr_code; |
| |
| Department(Manager mgr, String hr) { |
| this.mgr = mgr; |
| this.hr_code = hr; |
| } |
| |
| Manager getManager() { |
| return mgr; |
| } |
| |
| String getHR() { |
| return hr_code; |
| } |
| } |
| |
| static <T> void assertOrder(T o1, T o2, Comparator<? super T> cmp) { |
| if (cmp.compare(o1, o2) > 0) { |
| System.out.println("Fail!!"); |
| } |
| if (cmp.compare(o1, o2) == 0) { |
| System.out.println("Equal!!"); |
| } |
| } |
| |
| // Type tests just to make sure the code can compile and build |
| // Not necessarily need a meaningful result |
| public void testOrder() { |
| Manager m1 = new Manager("Manager", 2, 2000); |
| Manager m2 = new Manager("Manager", 4, 1300); |
| |
| // Comparator<Employee> tmp = Person.C; |
| |
| // Comparator<Manager> cmp = Employee.C.thenComparing(Person.C); |
| Comparator<Employee> cmp = Employee.C.thenComparing(Person.C); |
| assertOrder(m1, m2, Employee.C.thenComparing(Person.C)); |
| assertOrder(m1, m2, cmp); |
| assertOrder(m1, new Employee(1, "Z"), Person.C); |
| assertOrder(new Employee(1, "Z"), m2, Employee.C); |
| |
| assertOrder(m1, m2, Comparator.comparing(Employee::getName, String.CASE_INSENSITIVE_ORDER)); |
| |
| Map<String, Integer> map = new TreeMap<>(); |
| map.entrySet().stream().sorted(Map.Entry.comparingByKey(String.CASE_INSENSITIVE_ORDER)); |
| } |
| |
| public void testJDK8033590() { |
| Manager a = new Manager("John Doe", 1234, 16); |
| Manager b = new Manager("Jane Roe", 2468, 16); |
| Department da = new Department(a, "X"); |
| Department db = new Department(b, "X"); |
| |
| Comparator<Department> cmp = Comparator.comparing(Department::getHR) |
| .thenComparing(Department::getManager, Employee.C); |
| assertTrue(cmp.compare(da, db) < 0); |
| |
| cmp = Comparator.comparing(Department::getHR) |
| .thenComparing(Department::getManager, Manager.C); |
| assertTrue(cmp.compare(da, db) == 0); |
| |
| cmp = Comparator.comparing(Department::getHR) |
| .thenComparing(Department::getManager, Person.C); |
| assertTrue(cmp.compare(da, db) > 0); |
| } |
| } |