1/*
2 * Copyright (c) 2016, 2017, 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 * @run testng VarHandleTestAccessModeMethodNames
27 * @modules java.base/java.lang.invoke:open
28 */
29
30import org.testng.annotations.DataProvider;
31import org.testng.annotations.Test;
32
33import java.lang.invoke.VarHandle;
34import java.lang.reflect.Field;
35import java.lang.reflect.Method;
36import java.util.stream.Stream;
37
38import static org.testng.Assert.assertEquals;
39
40public class VarHandleTestAccessModeMethodNames {
41
42    @DataProvider
43    public static Object[][] accessModesProvider() {
44        return Stream.of(VarHandle.AccessMode.values()).
45                map(am -> new Object[]{am}).
46                toArray(Object[][]::new);
47    }
48
49    @Test(dataProvider = "accessModesProvider")
50    public void testMethodName(VarHandle.AccessMode am) {
51        assertEquals(am.methodName(), toMethodName(am.name()));
52    }
53
54    private static String toMethodName(String name) {
55        StringBuilder s = new StringBuilder(name.toLowerCase());
56        int i;
57        while ((i = s.indexOf("_")) !=  -1) {
58            s.deleteCharAt(i);
59            s.setCharAt(i, Character.toUpperCase(s.charAt(i)));
60        }
61        return s.toString();
62    }
63
64
65    @Test(dataProvider = "accessModesProvider")
66    public void testReturnType(VarHandle.AccessMode am) throws Exception {
67        assertEquals(getReturnType(am.methodName()), getAccessModeReturnType(am));
68    }
69
70    private static Class<?> getReturnType(String name) throws Exception {
71        return VarHandle.class.getMethod(name, Object[].class).getReturnType();
72    }
73
74    private static Class<?> getAccessModeReturnType(VarHandle.AccessMode am) throws Exception {
75        Field field_am_at = VarHandle.AccessMode.class.getDeclaredField("at");
76        field_am_at.setAccessible(true);
77        Field field_at_returnType = field_am_at.getType().getDeclaredField("returnType");
78        field_at_returnType.setAccessible(true);
79        return (Class<?>) field_at_returnType.get(field_am_at.get(am));
80    }
81}
82