118 lines
4.1 KiB
Java
118 lines
4.1 KiB
Java
/*
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* Copyright (c) 2013, 2015, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* @test
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* @bug 8007574
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* @summary Test Elements.isFunctionalInterface
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* @author Joseph D. Darcy
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* @library /tools/javac/lib
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* @modules java.compiler
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* jdk.compiler
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* @build JavacTestingAbstractProcessor TestIsFunctionalInterface
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* @compile -processor TestIsFunctionalInterface TestIsFunctionalInterface.java
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*/
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import java.util.Set;
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import javax.annotation.processing.*;
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import javax.lang.model.SourceVersion;
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import static javax.lang.model.SourceVersion.*;
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import javax.lang.model.element.*;
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import javax.lang.model.util.*;
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import static javax.lang.model.util.ElementFilter.*;
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import static javax.tools.Diagnostic.Kind.*;
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import static javax.tools.StandardLocation.*;
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import java.io.*;
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/**
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* Test basic workings of Elements.isFunctionalInterface
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*/
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public class TestIsFunctionalInterface extends JavacTestingAbstractProcessor {
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private int count = 0;
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public boolean process(Set<? extends TypeElement> annotations,
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RoundEnvironment roundEnv) {
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if (!roundEnv.processingOver()) {
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for(TypeElement type : typesIn(roundEnv.getElementsAnnotatedWith(ExpectedIsFunInt.class))) {
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count++;
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System.out.println(type);
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if (elements.isFunctionalInterface(type) !=
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type.getAnnotation(ExpectedIsFunInt.class).value()) {
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messager.printMessage(ERROR,
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"Mismatch between expected and computed isFunctionalInterface",
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type);
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}
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}
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} else {
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if (count <= 0)
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messager.printMessage(ERROR, "No types with ExpectedIsFunInt processed.");
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}
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return true;
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}
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}
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@interface ExpectedIsFunInt {
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boolean value();
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}
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// Examples below from the lambda specification documents.
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@ExpectedIsFunInt(false) // Equals is already an implicit member
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interface Foo1 { boolean equals(Object obj); }
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@ExpectedIsFunInt(true) // Bar has one abstract non-Object method
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interface Bar1 extends Foo1 { int compare(String o1, String o2); }
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@ExpectedIsFunInt(true) // Comparator has one abstract non-Object method
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interface LocalComparator<T> {
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boolean equals(Object obj);
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int compare(T o1, T o2);
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}
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@ExpectedIsFunInt(false) // Method Object.clone is not public
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interface Foo2 {
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int m();
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Object clone();
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}
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interface X1 { int m(Iterable<String> arg); }
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interface Y1 { int m(Iterable<String> arg); }
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@ExpectedIsFunInt(true) // Two methods, but they have the same signature
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interface Z1 extends X1, Y1 {}
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interface X2 { Iterable m(Iterable<String> arg); }
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interface Y2 { Iterable<String> m(Iterable arg); }
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@ExpectedIsFunInt(true) // Y.m is a subsignature & return-type-substitutable
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interface Z2 extends X2, Y2 {}
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interface Action<T> {
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T doit();
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}
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@ExpectedIsFunInt(true)
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interface LocalExecutor { <T> T execute(Action<T> a); }
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interface X5 { <T> T execute(Action<T> a); }
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interface Y5 { <S> S execute(Action<S> a); }
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@ExpectedIsFunInt(true) // Functional: signatures are "the same"
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interface Exec5 extends X5, Y5 {}
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