1 /* 2 * Copyright (c) 2024, 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 * @modules jdk.incubator.code 27 * @run junit TestMethodRefLambda 28 */ 29 30 import jdk.incubator.code.Op; 31 import jdk.incubator.code.Quotable; 32 import jdk.incubator.code.Quoted; 33 import jdk.incubator.code.dialect.java.JavaOp; 34 import org.junit.jupiter.api.Assertions; 35 import org.junit.jupiter.api.TestInstance; 36 import org.junit.jupiter.params.ParameterizedTest; 37 import org.junit.jupiter.params.provider.MethodSource; 38 39 import java.util.List; 40 import java.util.function.BiFunction; 41 import java.util.function.Function; 42 import java.util.function.IntUnaryOperator; 43 44 // Declare a per-class lifecycle, so we can declare an instance factory method 45 // as the source of arguments for parameterized tests 46 @TestInstance(TestInstance.Lifecycle.PER_CLASS) 47 public class TestMethodRefLambda { 48 49 interface QuotableIntUnaryOperator extends IntUnaryOperator, Quotable {} 50 51 interface QuotableFunction<T, R> extends Function<T, R>, Quotable {} 52 53 interface QuotableBiFunction<T, U, R> extends BiFunction<T, U, R>, Quotable {} 54 55 List<Quotable> methodRefLambdas() { 56 return List.of( 57 (QuotableIntUnaryOperator) TestMethodRefLambda::m1, 58 (QuotableIntUnaryOperator) TestMethodRefLambda::m2, 59 (QuotableFunction<Integer, Integer>) TestMethodRefLambda::m1, 60 (QuotableFunction<Integer, Integer>) TestMethodRefLambda::m2, 61 (QuotableIntUnaryOperator) this::m3, 62 (QuotableBiFunction<TestMethodRefLambda, Integer, Integer>) TestMethodRefLambda::m4 63 ); 64 } 65 66 @ParameterizedTest 67 @MethodSource("methodRefLambdas") 68 public void testIsMethodReference(Quotable q) { 69 Quoted quoted = Op.ofQuotable(q).get(); 70 JavaOp.LambdaOp lop = (JavaOp.LambdaOp) quoted.op(); 71 Assertions.assertTrue(lop.methodReference().isPresent()); 72 } 73 74 static int m1(int i) { 75 return i; 76 } 77 78 static Integer m2(Integer i) { 79 return i; 80 } 81 82 int m3(int i) { 83 return i; 84 } 85 86 static int m4(TestMethodRefLambda tl, int i) { 87 return i; 88 } 89 }