1/*
2 * Copyright (c) 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 8141508
27 * @summary Test that Call site initialization exception is not thrown when the method
28   reference receiver is of intersection type.
29 * @run main IntersectionTypeReceiverTest
30 */
31
32import java.time.LocalDate;
33import java.util.EnumSet;
34import java.util.Objects;
35import java.util.Optional;
36import java.util.function.Function;
37import java.util.function.Supplier;
38
39public class IntersectionTypeReceiverTest {
40
41    public static void main(String[] args) {
42        String output = valueOfKey(Size.class, LocalDate.now()).toString();
43        if (!"Optional[S]".equals(output))
44            throw new AssertionError("Unexpected output: " + output);
45    }
46
47    enum Size implements Supplier<LocalDate> {
48        S, M, L;
49
50        @Override
51        public LocalDate get() {
52            return LocalDate.now();
53        }
54
55    }
56
57    public static <K, T extends Enum<T> & Supplier<K>> Optional<T> valueOfKey(Class<T> enumType, K key) {
58        return valueOf(enumType, key, T::get);
59    }
60
61    public static <K, T extends Enum<T>> Optional<T> valueOf(Class<T> enumType, K key, Function<T, K> keyExtractor) {
62        return EnumSet.allOf(enumType).stream().filter(t -> Objects.equals(keyExtractor.apply(t), key)).findFirst();
63    }
64}
65