| /* |
| * Copyright (c) 2016, 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. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * 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 unit tests for java.lang.invoke.MethodHandles |
| * @run testng/othervm -ea -esa test.java.lang.invoke.ConstantIdentityMHTest |
| */ |
| package test.java.lang.invoke; |
| |
| import java.lang.invoke.MethodHandle; |
| import java.lang.invoke.MethodHandles; |
| import java.lang.invoke.MethodType; |
| import java.util.List; |
| import static java.lang.invoke.MethodHandles.*; |
| import static java.lang.invoke.MethodType.*; |
| import static org.testng.AssertJUnit.*; |
| import org.testng.annotations.*; |
| |
| public class ConstantIdentityMHTest { |
| |
| @DataProvider(name = "testZeroData") |
| private Object[][] testZeroData() { |
| return new Object[][] { |
| {void.class, "()void"}, |
| {int.class, "()int"}, |
| {byte.class, "()byte"}, |
| {short.class, "()short"}, |
| {long.class, "()long"}, |
| {float.class, "()float"}, |
| {double.class, "()double"}, |
| {boolean.class, "()boolean"}, |
| {char.class, "()char"}, |
| {Integer.class, "()Integer"} |
| }; |
| } |
| |
| @Test(dataProvider = "testZeroData") |
| public void testZero(Class<?> expectedtype, String expected) throws Throwable { |
| assertEquals(MethodHandles.zero(expectedtype).type().toString(), expected); |
| } |
| |
| @Test |
| @ExpectedExceptions(NullPointerException.class) |
| public void testZeroNPE() { |
| MethodHandle mh = MethodHandles.zero(null); |
| } |
| |
| @Test |
| void testEmpty() throws Throwable { |
| MethodHandle cat = lookup().findVirtual(String.class, "concat", methodType(String.class, String.class)); |
| assertEquals("xy", (String)cat.invoke("x","y")); |
| MethodHandle mhEmpty = MethodHandles.empty(cat.type()); |
| assertEquals(null, (String)mhEmpty.invoke("x","y")); |
| } |
| |
| @Test |
| @ExpectedExceptions(NullPointerException.class) |
| void testEmptyNPE() { |
| MethodHandle lenEmptyMH = MethodHandles.empty(null); |
| } |
| } |