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/*
* 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);
}
}
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