1 /* 2 * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 /* @test 27 * @bug 8158169 28 * @summary unit tests for java.lang.invoke.MethodHandles 29 * @run testng test.java.lang.invoke.DropArgumentsTest 30 */ 31 package test.java.lang.invoke; 32 33 import java.lang.invoke.MethodHandle; 34 import java.lang.invoke.MethodHandles; 35 import java.lang.invoke.MethodType; 36 import java.util.Collections; 37 import java.util.List; 38 import static java.lang.invoke.MethodHandles.*; 39 import static java.lang.invoke.MethodType.*; 40 import static org.testng.AssertJUnit.*; 41 import org.testng.annotations.*; 42 43 public class DropArgumentsTest { 44 45 @Test testDropArgumentsToMatch()46 public void testDropArgumentsToMatch() throws Throwable { 47 MethodHandle cat = lookup().findVirtual(String.class, "concat", methodType(String.class, String.class)); 48 MethodType bigType = cat.type().insertParameterTypes(0, String.class, String.class, int.class); 49 MethodHandle d0 = MethodHandles.dropArgumentsToMatch(cat, 0, bigType.parameterList(), 3); 50 assertEquals("xy",(String)d0.invokeExact("m", "n", 1, "x", "y")); 51 MethodHandle d1 = MethodHandles.dropArgumentsToMatch(cat, 0, bigType.parameterList(), 0); 52 assertEquals("mn",(String)d1.invokeExact("m", "n", 1, "x", "y")); 53 MethodHandle d2 = MethodHandles.dropArgumentsToMatch(cat, 1, bigType.parameterList(), 4); 54 assertEquals("xy",(String)d2.invokeExact("x", "b", "c", 1, "a", "y")); 55 56 } 57 58 @DataProvider(name = "dropArgumentsToMatchNPEData") dropArgumentsToMatchNPEData()59 private Object[][] dropArgumentsToMatchNPEData() 60 throws NoSuchMethodException, IllegalAccessException { 61 MethodHandle cat = lookup().findVirtual(String.class, "concat", methodType(String.class, String.class)); 62 return new Object[][] { 63 { (MethodHandle) null, 0, cat.type().parameterList(), 0 }, 64 { cat, 0, null, 0 } 65 }; 66 } 67 68 @Test(dataProvider = "dropArgumentsToMatchNPEData") 69 @ExpectedExceptions(NullPointerException.class) dropArgumentsToMatchNPE(MethodHandle target, int pos, List<Class<?>> valueType, int skip)70 public void dropArgumentsToMatchNPE(MethodHandle target, int pos, List<Class<?>> valueType, int skip) { 71 MethodHandles.dropArgumentsToMatch(target, pos, valueType , skip); 72 } 73 74 @DataProvider(name = "dropArgumentsToMatchIAEData") dropArgumentsToMatchIAEData()75 private Object[][] dropArgumentsToMatchIAEData() 76 throws NoSuchMethodException, IllegalAccessException { 77 MethodHandle cat = lookup().findVirtual(String.class, "concat", methodType(String.class, String.class)); 78 MethodType bigType = cat.type().insertParameterTypes(0, String.class, String.class, int.class); 79 return new Object[][] { 80 {cat, -1, bigType.parameterList(), 0}, 81 {cat, 0, bigType.parameterList(), -1}, 82 {cat, 3, bigType.parameterList(), 0}, 83 {cat, 0, bigType.parameterList(), 6}, 84 {cat, 0, bigType.parameterList(), 2} 85 }; 86 } 87 88 @Test(dataProvider = "dropArgumentsToMatchIAEData") 89 @ExpectedExceptions(IllegalArgumentException.class) dropArgumentsToMatchIAE(MethodHandle target, int pos, List<Class<?>> valueType, int skip)90 public void dropArgumentsToMatchIAE(MethodHandle target, int pos, List<Class<?>> valueType, int skip) { 91 MethodHandles.dropArgumentsToMatch(target, pos, valueType , skip); 92 } 93 94 @Test 95 @ExpectedExceptions(IllegalArgumentException.class) dropArgumentsToMatchTestWithVoid()96 public void dropArgumentsToMatchTestWithVoid() throws Throwable { 97 MethodHandle cat = lookup().findVirtual(String.class, "concat", 98 MethodType.methodType(String.class, String.class)); 99 MethodType bigTypewithVoid = cat.type().insertParameterTypes(0, void.class, String.class, int.class); 100 MethodHandle handle2 = MethodHandles.dropArgumentsToMatch(cat, 0, bigTypewithVoid.parameterList(), 1); 101 } 102 103 public static class MethodSet { 104 mVoid()105 static void mVoid() { 106 107 } 108 mVoid(int t)109 static void mVoid(int t) { 110 111 } 112 } 113 114 @Test dropArgumentsToMatchPosSkipRange()115 public void dropArgumentsToMatchPosSkipRange() throws Throwable { 116 // newTypes.size() == 1, pos == 1 && target.paramSize() == 0, skip == 0 117 MethodHandle mh1 = MethodHandles.lookup().findStatic(MethodSet.class, "mVoid", 118 MethodType.methodType(void.class)); 119 MethodHandle handle1 = dropArgumentsToMatch(mh1, 0, Collections.singletonList(int.class), 1); 120 assertEquals(1, handle1.type().parameterList().size()); 121 122 // newTypes.size() == 1, pos == 0 && target.paramSize() == 1, skip == 1 123 MethodHandle mh2 = MethodHandles.lookup().findStatic(MethodSet.class, "mVoid", 124 MethodType.methodType(void.class, int.class)); 125 MethodHandle handle2 = dropArgumentsToMatch(mh2, 1, Collections.singletonList(int.class), 0); 126 assertEquals(2, handle2.type().parameterList().size()); 127 } 128 } 129