1 /*
2 * Copyright (c) 2016, 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 package p;
24
25 import java.lang.invoke.MethodHandle;
26 import java.lang.invoke.MethodHandles;
27 import java.lang.invoke.MethodHandles.Lookup;
28 import java.lang.reflect.Modifier;
29 import java.lang.reflect.Module;
30
31 import static java.lang.invoke.MethodHandles.Lookup.*;
32
33 import org.testng.annotations.BeforeTest;
34 import org.testng.annotations.Test;
35 import static org.testng.Assert.*;
36
37 /**
38 * Unit tests for MethodHandles.privateLookupIn
39 */
40
41 @Test
42 public class PrivateLookupInTests {
43
44 /**
45 * A public and non-public types in the test module but in a different
46 * package to the test class.
47 *
48 * package p.internal;
49 * public class PublicType {
50 * }
51 *
52 * package p.internal;
53 * class NonPublicType {
54 * private static final Object obj = ...
55 * }
56 */
57 private Class<?> publicType;
58 private Class<?> nonPublicType;
59
60 // initialize and sanity check publicType/nonPublicType
61 @BeforeTest
62 public void init() throws Exception {
63 publicType = Class.forName("p.internal.PublicType");
64 assertTrue(this.getClass().getModule() == publicType.getModule());
65 assertNotEquals(this.getClass().getPackageName(), publicType.getPackageName());
66 assertTrue(Modifier.isPublic(publicType.getModifiers()));
67
68 nonPublicType = Class.forName("p.internal.NonPublicType");
69 assertTrue(this.getClass().getModule() == nonPublicType.getModule());
70 assertNotEquals(this.getClass().getPackageName(), nonPublicType.getPackageName());
71 assertFalse(Modifier.isPublic(nonPublicType.getModifiers()));
72 }
73
74 // Invoke MethodHandles.privateLookupIn with a full-power caller
75 public void testAllAccessCallerSameModule() throws Throwable {
76 Lookup lookup = MethodHandles.privateLookupIn(nonPublicType, MethodHandles.lookup());
77 assertTrue(lookup.lookupClass() == nonPublicType);
78 assertTrue(lookup.hasPrivateAccess());
79
80 // get obj field
81 MethodHandle mh = lookup.findStaticGetter(nonPublicType, "obj", Object.class);
82 Object obj = mh.invokeExact();
83 }
84
85 // Invoke MethodHandles.privateLookupIn with a reduced-power caller
86 public void testReducedAccessCallerSameModule() throws Throwable {
87 Lookup caller = MethodHandles.lookup().dropLookupMode(PACKAGE);
88 assertTrue((caller.lookupModes() & PRIVATE) == 0);
89 assertTrue((caller.lookupModes() & PACKAGE) == 0);
90 assertTrue((caller.lookupModes() & MODULE) != 0);
91
92 Lookup lookup = MethodHandles.privateLookupIn(nonPublicType, caller);
93 assertTrue(lookup.lookupClass() == nonPublicType);
94 assertTrue(lookup.hasPrivateAccess());
95
96 // use it
97 MethodHandle mh = lookup.findStaticGetter(nonPublicType, "obj", Object.class);
98 Object obj = mh.invokeExact();
99 }
100
101 // Invoke MethodHandles.privateLookupIn with the public lookup as caller
102 @Test(expectedExceptions = {IllegalAccessException.class})
103 public void testPublicLookupSameModule() throws Exception {
104 Lookup caller = MethodHandles.publicLookup();
105 Lookup lookup = MethodHandles.privateLookupIn(publicType, caller);
106 }
107
108 // test reads m1, open module m1 containing p1
109 public void testTargetClassInOpenModule() throws Throwable {
110 // m1/p1.Type
111 Class<?> clazz = Class.forName("p1.Type");
112 assertEquals(clazz.getModule().getName(), "m1");
113
114 // ensure that this module reads m1
115 Module thisModule = getClass().getModule();
116 Module m1 = clazz.getModule();
117 thisModule.addReads(clazz.getModule());
118 assertTrue(m1.isOpen("p1", thisModule));
119
120 Lookup lookup = MethodHandles.privateLookupIn(clazz, MethodHandles.lookup());
121 assertTrue(lookup.lookupClass() == clazz);
122 assertTrue(lookup.hasPrivateAccess());
123
124 // get obj field
125 MethodHandle mh = lookup.findStaticGetter(clazz, "obj", Object.class);
126 Object obj = mh.invokeExact();
127 }
128
129 // test does not read m2, m2 opens p2 to test
130 @Test(expectedExceptions = {IllegalAccessException.class})
131 public void testCallerDoesNotRead() throws Throwable {
132 // m2/p2.Type
133 Class<?> clazz = Class.forName("p2.Type");
134 assertEquals(clazz.getModule().getName(), "m2");
135
136 Module thisModule = getClass().getModule();
137 Module m2 = clazz.getModule();
138 assertFalse(thisModule.canRead(m2));
139 assertTrue(m2.isOpen("p2", thisModule));
140
141 Lookup lookup = MethodHandles.privateLookupIn(clazz, MethodHandles.lookup());
142 }
143
144 // test reads m3, m3 does not open p3 to test
145 @Test(expectedExceptions = {IllegalAccessException.class})
146 public void testNotOpenToCaller() throws Throwable {
147 // m3/p2.Type
148 Class<?> clazz = Class.forName("p3.Type");
149 assertEquals(clazz.getModule().getName(), "m3");
150
151 Module thisModule = getClass().getModule();
152 Module m3 = clazz.getModule();
153 thisModule.addReads(clazz.getModule());
154 assertFalse(m3.isOpen("p3", thisModule));
155
156 Lookup lookup = MethodHandles.privateLookupIn(clazz, MethodHandles.lookup());
157 }
158
159 // Invoke MethodHandles.privateLookupIn with a primitive class
160 @Test(expectedExceptions = {IllegalArgumentException.class})
161 public void testPrimitiveClassAsTargetClass() throws Exception {
162 MethodHandles.privateLookupIn(int.class, MethodHandles.lookup());
163 }
164
165 // Invoke MethodHandles.privateLookupIn with an array class
166 @Test(expectedExceptions = {IllegalArgumentException.class})
167 public void testArrayClassAsTargetClass() throws Exception {
168 MethodHandles.privateLookupIn(PrivateLookupInTests[].class, MethodHandles.lookup());
169 }
170
171 // Invoke MethodHandles.privateLookupIn with a primitive array class
172 @Test(expectedExceptions = {IllegalArgumentException.class})
173 public void testPrimitiveArrayClassAsTargetClass() throws Exception {
174 MethodHandles.privateLookupIn(int[].class, MethodHandles.lookup());
175 }
176
177 // Invoke MethodHandles.privateLookupIn with null
178 @Test(expectedExceptions = {NullPointerException.class})
179 public void testNullTargetClass() throws Exception {
180 MethodHandles.privateLookupIn(null, MethodHandles.lookup());
181 }
182
183 // Invoke MethodHandles.privateLookupIn with null
184 @Test(expectedExceptions = {NullPointerException.class})
185 public void testNullCaller() throws Exception {
186 MethodHandles.privateLookupIn(getClass(), null);
187 }
188 }