1/* 2 * Copyright (c) 2013, 2015, 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 8007574 27 * @summary Test Elements.isFunctionalInterface 28 * @author Joseph D. Darcy 29 * @library /tools/javac/lib 30 * @modules java.compiler 31 * jdk.compiler 32 * @build JavacTestingAbstractProcessor TestIsFunctionalInterface 33 * @compile -processor TestIsFunctionalInterface TestIsFunctionalInterface.java 34 */ 35 36import java.util.Set; 37import javax.annotation.processing.*; 38import javax.lang.model.SourceVersion; 39import static javax.lang.model.SourceVersion.*; 40import javax.lang.model.element.*; 41import javax.lang.model.util.*; 42import static javax.lang.model.util.ElementFilter.*; 43import static javax.tools.Diagnostic.Kind.*; 44import static javax.tools.StandardLocation.*; 45import java.io.*; 46 47/** 48 * Test basic workings of Elements.isFunctionalInterface 49 */ 50public class TestIsFunctionalInterface extends JavacTestingAbstractProcessor { 51 private int count = 0; 52 public boolean process(Set<? extends TypeElement> annotations, 53 RoundEnvironment roundEnv) { 54 if (!roundEnv.processingOver()) { 55 for(TypeElement type : typesIn(roundEnv.getElementsAnnotatedWith(ExpectedIsFunInt.class))) { 56 count++; 57 System.out.println(type); 58 if (elements.isFunctionalInterface(type) != 59 type.getAnnotation(ExpectedIsFunInt.class).value()) { 60 messager.printMessage(ERROR, 61 "Mismatch between expected and computed isFunctionalInterface", 62 type); 63 } 64 } 65 } else { 66 if (count <= 0) 67 messager.printMessage(ERROR, "No types with ExpectedIsFunInt processed."); 68 } 69 return true; 70 } 71} 72 73@interface ExpectedIsFunInt { 74 boolean value(); 75} 76 77// Examples below from the lambda specification documents. 78 79@ExpectedIsFunInt(false) // Equals is already an implicit member 80interface Foo1 { boolean equals(Object obj); } 81 82@ExpectedIsFunInt(true) // Bar has one abstract non-Object method 83interface Bar1 extends Foo1 { int compare(String o1, String o2); } 84 85 86@ExpectedIsFunInt(true) // Comparator has one abstract non-Object method 87interface LocalComparator<T> { 88 boolean equals(Object obj); 89 int compare(T o1, T o2); 90} 91 92@ExpectedIsFunInt(false) // Method Object.clone is not public 93interface Foo2 { 94 int m(); 95 Object clone(); 96} 97 98interface X1 { int m(Iterable<String> arg); } 99interface Y1 { int m(Iterable<String> arg); } 100@ExpectedIsFunInt(true) // Two methods, but they have the same signature 101interface Z1 extends X1, Y1 {} 102 103interface X2 { Iterable m(Iterable<String> arg); } 104interface Y2 { Iterable<String> m(Iterable arg); } 105@ExpectedIsFunInt(true) // Y.m is a subsignature & return-type-substitutable 106interface Z2 extends X2, Y2 {} 107 108interface Action<T> { 109 T doit(); 110} 111@ExpectedIsFunInt(true) 112interface LocalExecutor { <T> T execute(Action<T> a); } 113 114interface X5 { <T> T execute(Action<T> a); } 115interface Y5 { <S> S execute(Action<S> a); } 116@ExpectedIsFunInt(true) // Functional: signatures are "the same" 117interface Exec5 extends X5, Y5 {} 118