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/*
* Copyright (c) 2017, 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 basic tests for MethodHandle.invokeWithArguments
* @run testng test.java.lang.invoke.InvokeWithArgumentsTest
*/
package test.java.lang.invoke;
import org.testng.Assert;
import org.testng.annotations.Test;
import java.lang.invoke.MethodHandle;
import java.lang.invoke.MethodHandles;
import java.lang.invoke.WrongMethodTypeException;
import static java.lang.invoke.MethodType.methodType;
public class InvokeWithArgumentsTest {
static final MethodHandles.Lookup L = MethodHandles.lookup();
static Object[] arity(Object o1, Object o2, Object... a) {
return a;
}
@Test
public void testArity() throws Throwable {
MethodHandle mh = L.findStatic(L.lookupClass(), "arity",
methodType(Object[].class, Object.class, Object.class, Object[].class));
try {
mh.invokeWithArguments("");
Assert.fail("WrongMethodTypeException expected");
} catch (WrongMethodTypeException e) {}
}
static Object[] passThrough(String... a) {
return a;
}
static Object[] pack(Object o, Object... a) {
return a;
}
@Test
public void testArrayNoPassThrough() throws Throwable {
String[] actual = {"A", "B"};
MethodHandle mh = L.findStatic(L.lookupClass(), "passThrough",
methodType(Object[].class, String[].class));
// Note: the actual array is not preserved, the elements will be
// unpacked and then packed into a new array before invoking the method
String[] expected = (String[]) mh.invokeWithArguments(actual);
Assert.assertTrue(actual != expected, "Array should not pass through");
Assert.assertEquals(actual, expected, "Array contents should be equal");
}
@Test
public void testArrayPack() throws Throwable {
String[] actual = new String[]{"A", "B"};
MethodHandle mh = L.findStatic(L.lookupClass(), "pack",
methodType(Object[].class, Object.class, Object[].class));
// Note: since String[] can be cast to Object, the actual String[] array
// will cast to Object become the single element of a new Object[] array
Object[] expected = (Object[]) mh.invokeWithArguments("", actual);
Assert.assertEquals(1, expected.length, "Array should contain just one element");
Assert.assertTrue(actual == expected[0], "Array should pass through");
}
static void intArray(int... a) {
}
@Test
public void testPrimitiveArrayWithNull() throws Throwable {
MethodHandle mh = L.findStatic(L.lookupClass(), "intArray",
methodType(void.class, int[].class));
try {
mh.invokeWithArguments(null, null);
Assert.fail("NullPointerException expected");
} catch (NullPointerException e) {}
}
@Test
public void testPrimitiveArrayWithRef() throws Throwable {
MethodHandle mh = L.findStatic(L.lookupClass(), "intArray",
methodType(void.class, int[].class));
try {
mh.invokeWithArguments("A", "B");
Assert.fail("ClassCastException expected");
} catch (ClassCastException e) {}
}
static void numberArray(Number... a) {
}
@Test
public void testRefArrayWithCast() throws Throwable {
MethodHandle mh = L.findStatic(L.lookupClass(), "numberArray",
methodType(void.class, Number[].class));
// All numbers, should not throw
mh.invokeWithArguments(1, 1.0, 1.0F, 1L);
try {
mh.invokeWithArguments("A");
Assert.fail("ClassCastException expected");
} catch (ClassCastException e) {}
}
}
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