| /* |
| * Copyright (c) 2014, 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 |
| * @bug 8035776 |
| * @summary Consistent Lambda construction |
| */ |
| |
| import java.lang.invoke.LambdaMetafactory; |
| import java.lang.invoke.LambdaConversionException; |
| import java.lang.invoke.MethodHandle; |
| import java.lang.invoke.MethodHandles; |
| import java.lang.invoke.MethodType; |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| public class LambdaReturn { |
| |
| interface I { |
| void m(); |
| } |
| |
| static void hereV() {} |
| static String hereS() { return "hi"; } |
| static MethodHandles.Lookup l; |
| private static MethodType mt(Class<?> k) { return MethodType.methodType(k); } |
| private static MethodType mt(Class<?> k, Class<?> k2) { return MethodType.methodType(k, k2); } |
| private static void amf(List<String> errs, MethodHandle h, MethodType mts, MethodType mtf, MethodType mtb, boolean shouldWork) { |
| MethodType mti = mt(I.class); |
| try { |
| LambdaMetafactory.altMetafactory(l, "m", mti, mts,h,mtf, |
| LambdaMetafactory.FLAG_BRIDGES, 1, mtb); |
| } catch(LambdaConversionException e) { |
| if (shouldWork) errs.add("Error: Should work h=" + h + " s=" + mts + " -- f=" + mtf + " / b=" + mtb + " got: " + e); |
| return; |
| } |
| if (!shouldWork) errs.add("Error: Should fail h=" + h + " s=" + mts + " -- f=" + mtf + " / b=" + mtb); |
| } |
| |
| public static void main(String[] args) throws Throwable { |
| l = MethodHandles.lookup(); |
| MethodHandle hV = l.findStatic(LambdaReturn.class, "hereV", mt(void.class)); |
| MethodHandle hS = l.findStatic(LambdaReturn.class, "hereS", mt(String.class)); |
| List<String> errs = new ArrayList<>(); |
| MethodType V = mt(void.class); |
| MethodType S = mt(String.class); |
| MethodType O = mt(Object.class); |
| MethodType I = mt(int.class); |
| amf(errs, hS, S, S, O, true); |
| amf(errs, hS, S, S, V, false); |
| amf(errs, hS, S, S, I, false); |
| amf(errs, hS, O, S, S, true); |
| amf(errs, hS, V, S, S, false); |
| amf(errs, hS, I, S, S, false); |
| amf(errs, hS, O, O, S, false); |
| amf(errs, hS, S, O, O, false); |
| amf(errs, hV, V, V, O, false); |
| amf(errs, hV, V, V, I, false); |
| amf(errs, hV, V, V, S, false); |
| amf(errs, hV, O, V, V, false); |
| amf(errs, hV, I, V, V, false); |
| amf(errs, hV, S, V, V, false); |
| |
| if (errs.size() > 0) { |
| for (String err : errs) { |
| System.err.println(err); |
| } |
| throw new AssertionError("Errors: " + errs.size()); |
| } |
| } |
| } |