jdk8-mips64-public/langtools: test/tools/javac/processing/model/util/elements/TestIsFunctionalInterface.java@2eb010b6cb22

     1 /*

     2  * Copyright (c) 2013, 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  */

    24 /*

    25  * @test

    26  * @bug 8007574

    27  * @summary Test Elements.isFunctionalInterface

    28  * @author  Joseph D. Darcy

    29  * @library /tools/javac/lib

    30  * @build   JavacTestingAbstractProcessor TestIsFunctionalInterface

    31  * @compile -processor TestIsFunctionalInterface TestIsFunctionalInterface.java

    32  */

    34 import java.util.Set;

    35 import javax.annotation.processing.*;

    36 import javax.lang.model.SourceVersion;

    37 import static javax.lang.model.SourceVersion.*;

    38 import javax.lang.model.element.*;

    39 import javax.lang.model.util.*;

    40 import static javax.lang.model.util.ElementFilter.*;

    41 import static javax.tools.Diagnostic.Kind.*;

    42 import static javax.tools.StandardLocation.*;

    43 import java.io.*;

    45 /**

    46  * Test basic workings of Elements.isFunctionalInterface

    47  */

    48 public class TestIsFunctionalInterface extends JavacTestingAbstractProcessor {

    49     private int count = 0;

    50     public boolean process(Set<? extends TypeElement> annotations,

    51                            RoundEnvironment roundEnv) {

    52         if (!roundEnv.processingOver()) {

    53             for(TypeElement type : typesIn(roundEnv.getElementsAnnotatedWith(ExpectedIsFunInt.class))) {

    54                 count++;

    55                 System.out.println(type);

    56                 if (elements.isFunctionalInterface(type) !=

    57                     type.getAnnotation(ExpectedIsFunInt.class).value()) {

    58                     messager.printMessage(ERROR,

    59                                           "Mismatch between expected and computed isFunctionalInterface",

    60                                           type);

    61                 }

    62             }

    63         } else {

    64             if (count <= 0)

    65                 messager.printMessage(ERROR, "No types with ExpectedIsFunInt processed.");

    66             }

    67     return true;

    68     }

    69 }

    71 @interface ExpectedIsFunInt {

    72     boolean value();

    73 }

    75 // Examples below from the lambda specification documents.

    77 @ExpectedIsFunInt(false) // Equals is already an implicit member

    78 interface Foo1 { boolean equals(Object obj); }

    80 @ExpectedIsFunInt(true) // Bar has one abstract non-Object method

    81 interface Bar1 extends Foo1 { int compare(String o1, String o2); }

    84 @ExpectedIsFunInt(true) // Comparator has one abstract non-Object method

    85 interface LocalComparator<T> {

    86  boolean equals(Object obj);

    87  int compare(T o1, T o2);

    88 }

    90 @ExpectedIsFunInt(false) // Method Object.clone is not public

    91 interface Foo2 {

    92   int m();

    93   Object clone();

    94 }

    96 interface X1 { int m(Iterable<String> arg); }

    97 interface Y1 { int m(Iterable<String> arg); }

    98 @ExpectedIsFunInt(true) // Two methods, but they have the same signature

    99 interface Z1 extends X1, Y1 {}

   101 interface X2 { Iterable m(Iterable<String> arg); }

   102 interface Y2 { Iterable<String> m(Iterable arg); }

   103 @ExpectedIsFunInt(true) // Y.m is a subsignature & return-type-substitutable

   104 interface Z2 extends X2, Y2 {}

   106 interface Action<T> {

   107     T doit();

   108 }

   109 @ExpectedIsFunInt(true)

   110 interface LocalExecutor { <T> T execute(Action<T> a); }

   112 interface X5 { <T> T execute(Action<T> a); }

   113 interface Y5 { <S> S execute(Action<S> a); }

   114 @ExpectedIsFunInt(true) // Functional: signatures are "the same"

   115 interface Exec5 extends X5, Y5 {}

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