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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
* @bug 8158169
* @summary unit tests for java.lang.invoke.MethodHandles
* @run testng test.java.lang.invoke.DropArgumentsTest
*/
package test.java.lang.invoke;
import java.lang.invoke.MethodHandle;
import java.lang.invoke.MethodHandles;
import java.lang.invoke.MethodType;
import java.util.Collections;
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 DropArgumentsTest {
@Test
public void testDropArgumentsToMatch() throws Throwable {
MethodHandle cat = lookup().findVirtual(String.class, "concat", methodType(String.class, String.class));
MethodType bigType = cat.type().insertParameterTypes(0, String.class, String.class, int.class);
MethodHandle d0 = MethodHandles.dropArgumentsToMatch(cat, 0, bigType.parameterList(), 3);
assertEquals("xy",(String)d0.invokeExact("m", "n", 1, "x", "y"));
MethodHandle d1 = MethodHandles.dropArgumentsToMatch(cat, 0, bigType.parameterList(), 0);
assertEquals("mn",(String)d1.invokeExact("m", "n", 1, "x", "y"));
MethodHandle d2 = MethodHandles.dropArgumentsToMatch(cat, 1, bigType.parameterList(), 4);
assertEquals("xy",(String)d2.invokeExact("x", "b", "c", 1, "a", "y"));
}
@DataProvider(name = "dropArgumentsToMatchNPEData")
private Object[][] dropArgumentsToMatchNPEData()
throws NoSuchMethodException, IllegalAccessException {
MethodHandle cat = lookup().findVirtual(String.class, "concat", methodType(String.class, String.class));
return new Object[][] {
{ (MethodHandle) null, 0, cat.type().parameterList(), 0 },
{ cat, 0, null, 0 }
};
}
@Test(dataProvider = "dropArgumentsToMatchNPEData")
@ExpectedExceptions(NullPointerException.class)
public void dropArgumentsToMatchNPE(MethodHandle target, int pos, List<Class<?>> valueType, int skip) {
MethodHandles.dropArgumentsToMatch(target, pos, valueType , skip);
}
@DataProvider(name = "dropArgumentsToMatchIAEData")
private Object[][] dropArgumentsToMatchIAEData()
throws NoSuchMethodException, IllegalAccessException {
MethodHandle cat = lookup().findVirtual(String.class, "concat", methodType(String.class, String.class));
MethodType bigType = cat.type().insertParameterTypes(0, String.class, String.class, int.class);
return new Object[][] {
{cat, -1, bigType.parameterList(), 0},
{cat, 0, bigType.parameterList(), -1},
{cat, 3, bigType.parameterList(), 0},
{cat, 0, bigType.parameterList(), 6},
{cat, 0, bigType.parameterList(), 2}
};
}
@Test(dataProvider = "dropArgumentsToMatchIAEData")
@ExpectedExceptions(IllegalArgumentException.class)
public void dropArgumentsToMatchIAE(MethodHandle target, int pos, List<Class<?>> valueType, int skip) {
MethodHandles.dropArgumentsToMatch(target, pos, valueType , skip);
}
@Test
@ExpectedExceptions(IllegalArgumentException.class)
public void dropArgumentsToMatchTestWithVoid() throws Throwable {
MethodHandle cat = lookup().findVirtual(String.class, "concat",
MethodType.methodType(String.class, String.class));
MethodType bigTypewithVoid = cat.type().insertParameterTypes(0, void.class, String.class, int.class);
MethodHandle handle2 = MethodHandles.dropArgumentsToMatch(cat, 0, bigTypewithVoid.parameterList(), 1);
}
public static class MethodSet {
static void mVoid() {
}
static void mVoid(int t) {
}
}
@Test
public void dropArgumentsToMatchPosSkipRange() throws Throwable {
// newTypes.size() == 1, pos == 1 && target.paramSize() == 0, skip == 0
MethodHandle mh1 = MethodHandles.lookup().findStatic(MethodSet.class, "mVoid",
MethodType.methodType(void.class));
MethodHandle handle1 = dropArgumentsToMatch(mh1, 0, Collections.singletonList(int.class), 1);
assertEquals(1, handle1.type().parameterList().size());
// newTypes.size() == 1, pos == 0 && target.paramSize() == 1, skip == 1
MethodHandle mh2 = MethodHandles.lookup().findStatic(MethodSet.class, "mVoid",
MethodType.methodType(void.class, int.class));
MethodHandle handle2 = dropArgumentsToMatch(mh2, 1, Collections.singletonList(int.class), 0);
assertEquals(2, handle2.type().parameterList().size());
}
}
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