1 /* 2 * Copyright (c) 2012, 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. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 /** 25 * @test 26 * @bug 7196190 27 * @summary Improve method of handling MethodHandles 28 * 29 * @run main/othervm ClassForNameTest 30 */ 31 32 import java.lang.invoke.*; 33 import java.lang.reflect.Method; 34 import java.util.Arrays; 35 36 public class ClassForNameTest { 37 static final String NAME = ClassForNameTest.class.getName(); 38 39 public static void main(String[] args) throws Throwable { 40 { 41 final MethodType mt = MethodType.methodType(Class.class, String.class); 42 final MethodHandle mh = MethodHandles.lookup() 43 .findStatic(Class.class, "forName", mt); 44 45 Class.forName(NAME); 46 47 mh.invoke(NAME); 48 mh.bindTo(NAME).invoke(); 49 mh.invokeWithArguments(Arrays.asList(NAME)); 50 mh.invokeWithArguments(NAME); 51 Class cls = (Class) mh.invokeExact(NAME); 52 } 53 54 { 55 final Method fnMethod = Class.class.getMethod("forName", String.class); 56 final MethodType mt = MethodType.methodType(Object.class, Object.class, Object[].class); 57 final MethodHandle mh = MethodHandles.lookup() 58 .findVirtual(Method.class, "invoke", mt) 59 .bindTo(fnMethod); 60 61 fnMethod.invoke(null, NAME); 62 63 mh.bindTo(null).bindTo(new Object[]{NAME}).invoke(); 64 mh.invoke(null, new Object[]{NAME}); 65 mh.invokeWithArguments(null, new Object[]{NAME}); 66 mh.invokeWithArguments(Arrays.asList(null, new Object[]{NAME})); 67 Object obj = mh.invokeExact((Object) null, new Object[]{NAME}); 68 } 69 70 { 71 final Method fnMethod = Class.class.getMethod("forName", String.class); 72 final MethodType mt = MethodType.methodType(Object.class, Object.class, Object[].class); 73 74 final MethodHandle mh = MethodHandles.lookup() 75 .bind(fnMethod, "invoke", mt); 76 77 mh.bindTo(null).bindTo(new Object[]{NAME}).invoke(); 78 mh.invoke(null, new Object[]{NAME}); 79 mh.invokeWithArguments(null, NAME); 80 mh.invokeWithArguments(Arrays.asList(null, NAME)); 81 Object obj = mh.invokeExact((Object) null, new Object[]{NAME}); 82 } 83 84 { 85 final Method fnMethod = Class.class.getMethod("forName", String.class); 86 final MethodHandle mh = MethodHandles.lookup().unreflect(fnMethod); 87 88 mh.bindTo(NAME).invoke(); 89 mh.invoke(NAME); 90 mh.invokeWithArguments(NAME); 91 mh.invokeWithArguments(Arrays.asList(NAME)); 92 Class cls = (Class) mh.invokeExact(NAME); 93 } 94 95 System.out.println("TEST PASSED"); 96 } 97 }