136 lines
4.8 KiB
Java
136 lines
4.8 KiB
Java
/*
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* Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/* @test
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* @summary basic tests for MethodHandle.invokeWithArguments
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* @run testng test.java.lang.invoke.InvokeWithArgumentsTest
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*/
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package test.java.lang.invoke;
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import org.testng.Assert;
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import org.testng.annotations.Test;
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import java.lang.invoke.MethodHandle;
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import java.lang.invoke.MethodHandles;
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import java.lang.invoke.WrongMethodTypeException;
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import static java.lang.invoke.MethodType.methodType;
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public class InvokeWithArgumentsTest {
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static final MethodHandles.Lookup L = MethodHandles.lookup();
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static Object[] arity(Object o1, Object o2, Object... a) {
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return a;
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}
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@Test
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public void testArity() throws Throwable {
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MethodHandle mh = L.findStatic(L.lookupClass(), "arity",
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methodType(Object[].class, Object.class, Object.class, Object[].class));
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try {
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mh.invokeWithArguments("");
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Assert.fail("WrongMethodTypeException expected");
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} catch (WrongMethodTypeException e) {}
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}
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static Object[] passThrough(String... a) {
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return a;
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}
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static Object[] pack(Object o, Object... a) {
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return a;
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}
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@Test
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public void testArrayNoPassThrough() throws Throwable {
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String[] actual = {"A", "B"};
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MethodHandle mh = L.findStatic(L.lookupClass(), "passThrough",
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methodType(Object[].class, String[].class));
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// Note: the actual array is not preserved, the elements will be
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// unpacked and then packed into a new array before invoking the method
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String[] expected = (String[]) mh.invokeWithArguments(actual);
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Assert.assertTrue(actual != expected, "Array should not pass through");
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Assert.assertEquals(actual, expected, "Array contents should be equal");
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}
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@Test
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public void testArrayPack() throws Throwable {
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String[] actual = new String[]{"A", "B"};
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MethodHandle mh = L.findStatic(L.lookupClass(), "pack",
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methodType(Object[].class, Object.class, Object[].class));
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// Note: since String[] can be cast to Object, the actual String[] array
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// will cast to Object become the single element of a new Object[] array
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Object[] expected = (Object[]) mh.invokeWithArguments("", actual);
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Assert.assertEquals(1, expected.length, "Array should contain just one element");
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Assert.assertTrue(actual == expected[0], "Array should pass through");
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}
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static void intArray(int... a) {
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}
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@Test
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public void testPrimitiveArrayWithNull() throws Throwable {
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MethodHandle mh = L.findStatic(L.lookupClass(), "intArray",
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methodType(void.class, int[].class));
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try {
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mh.invokeWithArguments(null, null);
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Assert.fail("NullPointerException expected");
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} catch (NullPointerException e) {}
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}
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@Test
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public void testPrimitiveArrayWithRef() throws Throwable {
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MethodHandle mh = L.findStatic(L.lookupClass(), "intArray",
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methodType(void.class, int[].class));
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try {
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mh.invokeWithArguments("A", "B");
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Assert.fail("ClassCastException expected");
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} catch (ClassCastException e) {}
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}
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static void numberArray(Number... a) {
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}
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@Test
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public void testRefArrayWithCast() throws Throwable {
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MethodHandle mh = L.findStatic(L.lookupClass(), "numberArray",
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methodType(void.class, Number[].class));
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// All numbers, should not throw
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mh.invokeWithArguments(1, 1.0, 1.0F, 1L);
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try {
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mh.invokeWithArguments("A");
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Assert.fail("ClassCastException expected");
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} catch (ClassCastException e) {}
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}
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}
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