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/*
* Copyright (c) 2013, 2015, 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 8007574
* @summary Test Elements.isFunctionalInterface
* @author Joseph D. Darcy
* @library /tools/javac/lib
* @modules java.compiler
* jdk.compiler
* @build JavacTestingAbstractProcessor TestIsFunctionalInterface
* @compile -processor TestIsFunctionalInterface TestIsFunctionalInterface.java
*/
import java.util.Set;
import javax.annotation.processing.*;
import javax.lang.model.SourceVersion;
import static javax.lang.model.SourceVersion.*;
import javax.lang.model.element.*;
import javax.lang.model.util.*;
import static javax.lang.model.util.ElementFilter.*;
import static javax.tools.Diagnostic.Kind.*;
import static javax.tools.StandardLocation.*;
import java.io.*;
/**
* Test basic workings of Elements.isFunctionalInterface
*/
public class TestIsFunctionalInterface extends JavacTestingAbstractProcessor {
private int count = 0;
public boolean process(Set<? extends TypeElement> annotations,
RoundEnvironment roundEnv) {
if (!roundEnv.processingOver()) {
for(TypeElement type : typesIn(roundEnv.getElementsAnnotatedWith(ExpectedIsFunInt.class))) {
count++;
System.out.println(type);
if (elements.isFunctionalInterface(type) !=
type.getAnnotation(ExpectedIsFunInt.class).value()) {
messager.printMessage(ERROR,
"Mismatch between expected and computed isFunctionalInterface",
type);
}
}
} else {
if (count <= 0)
messager.printMessage(ERROR, "No types with ExpectedIsFunInt processed.");
}
return true;
}
}
@interface ExpectedIsFunInt {
boolean value();
}
// Examples below from the lambda specification documents.
@ExpectedIsFunInt(false) // Equals is already an implicit member
interface Foo1 { boolean equals(Object obj); }
@ExpectedIsFunInt(true) // Bar has one abstract non-Object method
interface Bar1 extends Foo1 { int compare(String o1, String o2); }
@ExpectedIsFunInt(true) // Comparator has one abstract non-Object method
interface LocalComparator<T> {
boolean equals(Object obj);
int compare(T o1, T o2);
}
@ExpectedIsFunInt(false) // Method Object.clone is not public
interface Foo2 {
int m();
Object clone();
}
interface X1 { int m(Iterable<String> arg); }
interface Y1 { int m(Iterable<String> arg); }
@ExpectedIsFunInt(true) // Two methods, but they have the same signature
interface Z1 extends X1, Y1 {}
interface X2 { Iterable m(Iterable<String> arg); }
interface Y2 { Iterable<String> m(Iterable arg); }
@ExpectedIsFunInt(true) // Y.m is a subsignature & return-type-substitutable
interface Z2 extends X2, Y2 {}
interface Action<T> {
T doit();
}
@ExpectedIsFunInt(true)
interface LocalExecutor { <T> T execute(Action<T> a); }
interface X5 { <T> T execute(Action<T> a); }
interface Y5 { <S> S execute(Action<S> a); }
@ExpectedIsFunInt(true) // Functional: signatures are "the same"
interface Exec5 extends X5, Y5 {}
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