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 org.graalvm.compiler.core.common.util;
24
25 import static org.graalvm.compiler.core.common.util.Util.JAVA_SPECIFICATION_VERSION;
26
27 import java.lang.reflect.InvocationTargetException;
28 import java.lang.reflect.Method;
29 import java.lang.reflect.Modifier;
30
31 /**
32 * Reflection based access to the Module API introduced by JDK 9. This allows the API to be used in
33 * code that must be compiled on a JDK prior to 9. Use of this class must be guarded by a test for
34 * JDK 9 or later. For example:
35 *
36 * <pre>
37 * if (Util.JAVA_SPECIFICATION_VERSION >= 9) {
38 * // Use of ModuleAPI
39 * }
40 * </pre>
41 */
42 public final class ModuleAPI {
43
44 private ModuleAPI(Method method) {
45 this.method = method;
46 }
47
48 private final Method method;
49
50 /**
51 * {@code Class.getModule()}.
52 */
53 public static final ModuleAPI getModule;
54
55 /**
56 * {@code jdk.internal.module.Modules.addExports(Module, String, Module)}.
57 */
58 public static final ModuleAPI addExports;
59
60 /**
61 * {@code java.lang.reflect.Module.getResourceAsStream(String)}.
62 */
63 public static final ModuleAPI getResourceAsStream;
64
65 /**
66 * {@code java.lang.reflect.Module.canRead(Module)}.
67 */
68 public static final ModuleAPI canRead;
69
70 /**
71 * {@code java.lang.reflect.Module.isExported(String)}.
72 */
73 public static final ModuleAPI isExported;
74
75 /**
76 * {@code java.lang.reflect.Module.isExported(String, Module)}.
77 */
78 public static final ModuleAPI isExportedTo;
79
80 /**
81 * Invokes the static Module API method represented by this object.
82 */
83 @SuppressWarnings("unchecked")
84 public <T> T invokeStatic(Object... args) {
85 checkAvailability();
88 return (T) method.invoke(null, args);
89 } catch (IllegalAccessException | IllegalArgumentException | InvocationTargetException e) {
90 throw new InternalError(e);
91 }
92 }
93
94 /**
95 * Invokes the non-static Module API method represented by this object.
96 */
97 @SuppressWarnings("unchecked")
98 public <T> T invoke(Object receiver, Object... args) {
99 checkAvailability();
100 assert !Modifier.isStatic(method.getModifiers());
101 try {
102 return (T) method.invoke(receiver, args);
103 } catch (IllegalAccessException | IllegalArgumentException | InvocationTargetException e) {
104 throw new InternalError(e);
105 }
106 }
107
108 private void checkAvailability() throws InternalError {
109 if (method == null) {
110 throw new InternalError("Cannot use Module API on JDK " + JAVA_SPECIFICATION_VERSION);
111 }
112 }
113
114 static {
115 if (JAVA_SPECIFICATION_VERSION >= 9) {
116 try {
117 getModule = new ModuleAPI(Class.class.getMethod("getModule"));
118 Class<?> moduleClass = getModule.method.getReturnType();
119 Class<?> modulesClass = Class.forName("jdk.internal.module.Modules");
120 getResourceAsStream = new ModuleAPI(moduleClass.getMethod("getResourceAsStream", String.class));
121 canRead = new ModuleAPI(moduleClass.getMethod("canRead", moduleClass));
122 isExported = new ModuleAPI(moduleClass.getMethod("isExported", String.class));
123 isExportedTo = new ModuleAPI(moduleClass.getMethod("isExported", String.class, moduleClass));
124 addExports = new ModuleAPI(modulesClass.getDeclaredMethod("addExports", moduleClass, String.class, moduleClass));
125 } catch (NoSuchMethodException | SecurityException | ClassNotFoundException e) {
126 throw new InternalError(e);
127 }
128 } else {
129 ModuleAPI unavailable = new ModuleAPI(null);
130 getModule = unavailable;
131 getResourceAsStream = unavailable;
132 canRead = unavailable;
133 isExported = unavailable;
134 isExportedTo = unavailable;
135 addExports = unavailable;
136 }
137
138 }
139 }
|
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 org.graalvm.compiler.core.common.util;
24
25 import static org.graalvm.compiler.core.common.util.Util.JAVA_SPECIFICATION_VERSION;
26
27 import java.lang.reflect.AccessibleObject;
28 import java.lang.reflect.InvocationTargetException;
29 import java.lang.reflect.Method;
30 import java.lang.reflect.Modifier;
31
32 /**
33 * Reflection based access to the Module API introduced by JDK 9. This allows the API to be used in
34 * code that must be compiled on a JDK prior to 9. Use of this class must be guarded by a test for
35 * JDK 9 or later. For example:
36 *
37 * <pre>
38 * if (Util.JAVA_SPECIFICATION_VERSION >= 9) {
39 * // Use of ModuleAPI
40 * }
41 * </pre>
42 */
43 public final class ModuleAPI {
44
45 private ModuleAPI(Method method) {
46 this.method = method;
47 }
48
49 private final Method method;
50
51 /**
52 * {@code Class.getModule()}.
53 */
54 public static final ModuleAPI getModule;
55
56 /**
57 * {@code jdk.internal.module.Modules.addExports(Module, String, Module)}.
58 */
59 public static final ModuleAPI addExports;
60
61 /**
62 * {@code jdk.internal.module.Modules.addOpens(Module, String, Module)}.
63 */
64 public static final ModuleAPI addOpens;
65
66 /**
67 * {@code java.lang.reflect.Module.getResourceAsStream(String)}.
68 */
69 public static final ModuleAPI getResourceAsStream;
70
71 /**
72 * {@code java.lang.reflect.Module.getPackages()}.
73 */
74 public static final ModuleAPI getPackages;
75
76 /**
77 * {@code java.lang.reflect.Module.canRead(Module)}.
78 */
79 public static final ModuleAPI canRead;
80
81 /**
82 * {@code java.lang.reflect.Module.isExported(String)}.
83 */
84 public static final ModuleAPI isExported;
85
86 /**
87 * {@code java.lang.reflect.Module.isExported(String, Module)}.
88 */
89 public static final ModuleAPI isExportedTo;
90
91 /**
92 * Invokes the static Module API method represented by this object.
93 */
94 @SuppressWarnings("unchecked")
95 public <T> T invokeStatic(Object... args) {
96 checkAvailability();
99 return (T) method.invoke(null, args);
100 } catch (IllegalAccessException | IllegalArgumentException | InvocationTargetException e) {
101 throw new InternalError(e);
102 }
103 }
104
105 /**
106 * Invokes the non-static Module API method represented by this object.
107 */
108 @SuppressWarnings("unchecked")
109 public <T> T invoke(Object receiver, Object... args) {
110 checkAvailability();
111 assert !Modifier.isStatic(method.getModifiers());
112 try {
113 return (T) method.invoke(receiver, args);
114 } catch (IllegalAccessException | IllegalArgumentException | InvocationTargetException e) {
115 throw new InternalError(e);
116 }
117 }
118
119 /**
120 * Opens all packages in {@code moduleMember}'s module for deep reflection (i.e., allow
121 * {@link AccessibleObject#setAccessible(boolean)} to be called for any class/method/field) by
122 * {@code requestor}'s module.
123 */
124 public static void openAllPackagesForReflectionTo(Class<?> moduleMember, Class<?> requestor) {
125 Object moduleToOpen = getModule.invoke(moduleMember);
126 Object requestorModule = getModule.invoke(requestor);
127 if (moduleToOpen != requestorModule) {
128 String[] packages = getPackages.invoke(moduleToOpen);
129 for (String pkg : packages) {
130 addOpens.invokeStatic(moduleToOpen, pkg, requestorModule);
131 }
132 }
133 }
134
135 /**
136 * Opens {@code declaringClass}'s package to allow a method declared in {@code accessor} to call
137 * {@link AccessibleObject#setAccessible(boolean)} on an {@link AccessibleObject} representing a
138 * field or method declared by {@code declaringClass}.
139 */
140 public static void openForReflectionTo(Class<?> declaringClass, Class<?> accessor) {
141 Object moduleToOpen = getModule.invoke(declaringClass);
142 Object accessorModule = getModule.invoke(accessor);
143 if (moduleToOpen != accessorModule) {
144 addOpens.invokeStatic(moduleToOpen, declaringClass.getPackage().getName(), accessorModule);
145 }
146 }
147
148 /**
149 * Exports the package named {@code packageName} declared in {@code moduleMember}'s module to
150 * {@code requestor}'s module.
151 */
152 public static void exportPackageTo(Class<?> moduleMember, String packageName, Class<?> requestor) {
153 Object moduleToExport = getModule.invoke(moduleMember);
154 Object requestorModule = getModule.invoke(requestor);
155 if (moduleToExport != requestorModule) {
156 addExports.invokeStatic(moduleToExport, packageName, requestorModule);
157 }
158 }
159
160 private void checkAvailability() throws InternalError {
161 if (method == null) {
162 throw new InternalError("Cannot use Module API on JDK " + JAVA_SPECIFICATION_VERSION);
163 }
164 }
165
166 static {
167 if (JAVA_SPECIFICATION_VERSION >= 9) {
168 try {
169 getModule = new ModuleAPI(Class.class.getMethod("getModule"));
170 Class<?> moduleClass = getModule.method.getReturnType();
171 Class<?> modulesClass = Class.forName("jdk.internal.module.Modules");
172 getResourceAsStream = new ModuleAPI(moduleClass.getMethod("getResourceAsStream", String.class));
173 getPackages = new ModuleAPI(moduleClass.getMethod("getPackages"));
174 canRead = new ModuleAPI(moduleClass.getMethod("canRead", moduleClass));
175 isExported = new ModuleAPI(moduleClass.getMethod("isExported", String.class));
176 isExportedTo = new ModuleAPI(moduleClass.getMethod("isExported", String.class, moduleClass));
177 addExports = new ModuleAPI(modulesClass.getDeclaredMethod("addExports", moduleClass, String.class, moduleClass));
178 addOpens = new ModuleAPI(modulesClass.getDeclaredMethod("addOpens", moduleClass, String.class, moduleClass));
179 } catch (NoSuchMethodException | SecurityException | ClassNotFoundException e) {
180 throw new InternalError(e);
181 }
182 } else {
183 ModuleAPI unavailable = new ModuleAPI(null);
184 getModule = unavailable;
185 getResourceAsStream = unavailable;
186 getPackages = unavailable;
187 canRead = unavailable;
188 isExported = unavailable;
189 isExportedTo = unavailable;
190 addExports = unavailable;
191 addOpens = unavailable;
192 }
193
194 }
195 }
|