1 /*
2 * Copyright (c) 2015, 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. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package com.sun.tools.javac.util;
27
28 import java.lang.reflect.InvocationTargetException;
29 import java.lang.reflect.Method;
30 import java.nio.file.Path;
31 import java.util.Collection;
32 import java.util.ServiceLoader;
33
34 /**
35 * This class provides wrappers for classes and methods that are new in JDK 9, and which are not
36 * available on older versions of the platform on which javac may be compiled and run.
37 * In future releases, when javac is always compiled on JDK 9 or later, the use of these wrappers
38 * can be replaced by use of the real underlying classes.
39 *
40 * <p>Wrapper classes provide a subset of the API of the wrapped classes, as needed for use
41 * in javac. Wrapper objects contain an {@code Object} reference to the underlying runtime object,
42 * and {@code Class} and {@code Method} objects for obtaining or using such instances via
43 * runtime reflection. The {@code Class} and {@code Method} objects are set up on a per-class
44 * basis, by an {@code init} method, which is called from static methods on the wrapper class,
45 * or in the constructor, when instances are created.
46 * <p>
47 *
48 * <p><b>This is NOT part of any supported API.
49 * If you write code that depends on this, you do so at your own risk.
50 * This code and its internal interfaces are subject to change or
51 * deletion without notice.</b>
52 */
53 public class JDK9Wrappers {
54
55 /**
56 * Helper class for new method in java.util.ServiceLoader.
57 */
58 public static final class ServiceLoaderHelper {
59 @SuppressWarnings("unchecked")
60 public static <S> ServiceLoader<S> load(Layer layer, Class<S> service) {
61 try {
62 init();
63 Object result = loadMethod.invoke(null, layer.theRealLayer, service);
64 return (ServiceLoader<S>)result;
65 } catch (IllegalAccessException | IllegalArgumentException | InvocationTargetException
66 | SecurityException ex) {
67 throw new Abort(ex);
68 }
69 }
70
71 // -----------------------------------------------------------------------------------------
72
73 private static Method loadMethod = null;
74
75 private static void init() {
76 if (loadMethod == null) {
77 try {
78 Class<?> layerClass = Layer.layerClass;
79 loadMethod = ServiceLoader.class.getDeclaredMethod("load", layerClass, Class.class);
80 } catch (NoSuchMethodException | SecurityException ex) {
81 throw new Abort(ex);
82 }
83 }
84 }
85 }
86
87 /**
88 * Wrapper class for java.lang.module.ModuleFinder.
89 */
90 public static class ModuleFinder {
91 private final Object theRealModuleFinder;
92
93 private ModuleFinder(Object moduleFinder) {
94 this.theRealModuleFinder = moduleFinder;
95 init();
96 }
97
98 public static ModuleFinder of(Path... dirs) {
99 try {
100 init();
101 Object result = ofMethod.invoke(null, (Object)dirs);
102 ModuleFinder mFinder = new ModuleFinder(result);
103 return mFinder;
104 } catch (IllegalAccessException | IllegalArgumentException | InvocationTargetException
105 | SecurityException ex) {
106 throw new Abort(ex);
107 }
108 }
109
110 // -----------------------------------------------------------------------------------------
111
112 private static Class<?> moduleFinderClass = null;
113 private static Method ofMethod;
114
115 static final Class<?> getModuleFinderClass() {
116 init();
117 return moduleFinderClass;
118 }
119
120 private static void init() {
121 if (moduleFinderClass == null) {
122 try {
123 moduleFinderClass = Class.forName("java.lang.module.ModuleFinder", false, null);
124 ofMethod = moduleFinderClass.getDeclaredMethod("of", Path[].class);
125 } catch (ClassNotFoundException | NoSuchMethodException | SecurityException ex) {
126 throw new Abort(ex);
127 }
128 }
129 }
130 }
131
132 /**
133 * Wrapper class for java.lang.module.Configuration.
134 */
135 public static final class Configuration {
136 private final Object theRealConfiguration;
137
138 private Configuration(Object configuration) {
139 this.theRealConfiguration = configuration;
140 init();
141 }
142
143 public Configuration resolveRequiresAndUses(
144 ModuleFinder beforeFinder,
145 ModuleFinder afterFinder,
146 Collection<String> roots) {
147 try {
148 Object result = resolveRequiresAndUsesMethod.invoke(theRealConfiguration,
149 beforeFinder.theRealModuleFinder,
150 afterFinder.theRealModuleFinder,
151 roots
152 );
153 Configuration configuration = new Configuration(result);
154 return configuration;
155 } catch (IllegalAccessException | IllegalArgumentException | InvocationTargetException
156 | SecurityException ex) {
157 throw new Abort(ex);
158 }
159 }
160
161 // -----------------------------------------------------------------------------------------
162
163 private static Class<?> configurationClass = null;
164 private static Method resolveRequiresAndUsesMethod;
165
166 static final Class<?> getConfigurationClass() {
167 init();
168 return configurationClass;
169 }
170
171 private static void init() {
172 if (configurationClass == null) {
173 try {
174 configurationClass = Class.forName("java.lang.module.Configuration", false, null);
175 Class<?> moduleFinderInterface = ModuleFinder.getModuleFinderClass();
176 resolveRequiresAndUsesMethod = configurationClass.getDeclaredMethod("resolveRequiresAndUses",
177 moduleFinderInterface,
178 moduleFinderInterface,
179 Collection.class
180 );
181 } catch (ClassNotFoundException | NoSuchMethodException | SecurityException ex) {
182 throw new Abort(ex);
183 }
184 }
185 }
186 }
187
188 /**
189 * Wrapper class for java.lang.module.Layer.
190 */
191 public static final class Layer {
192 private final Object theRealLayer;
193
194 private Layer(Object layer) {
195 this.theRealLayer = layer;
196 }
197
198 public static Layer boot() {
199 try {
200 init();
201 Object result = bootMethod.invoke(null);
202 Layer layer = new Layer(result);
203 return layer;
204 } catch (IllegalAccessException | IllegalArgumentException | InvocationTargetException
205 | SecurityException ex) {
206 throw new Abort(ex);
207 }
208 }
209
210 public Configuration configuration() {
211 try {
212 Object result = configurationMethod.invoke(theRealLayer);
213 Configuration configuration = new Configuration(result);
214 return configuration;
215 } catch (IllegalAccessException | IllegalArgumentException | InvocationTargetException
216 | SecurityException ex) {
217 throw new Abort(ex);
218 }
219 }
220
221 public Layer defineModulesWithOneLoader(Configuration configuration, ClassLoader parentClassLoader) {
222 try {
223 Object result = defineModulesWithOneLoaderMethod.invoke(
224 theRealLayer, configuration.theRealConfiguration, parentClassLoader);
225 Layer layer = new Layer(result);
226 return layer;
227 } catch (IllegalAccessException | IllegalArgumentException | InvocationTargetException
228 | SecurityException ex) {
229 throw new Abort(ex);
230 }
231 }
232
233 // -----------------------------------------------------------------------------------------
234
235 private static Class<?> layerClass = null;
236 private static Method bootMethod;
237 private static Method defineModulesWithOneLoaderMethod;
238 private static Method configurationMethod;
239
240 private static void init() {
241 if (layerClass == null) {
242 try {
243 layerClass = Class.forName("java.lang.reflect.Layer", false, null);
244 bootMethod = layerClass.getDeclaredMethod("boot");
245 defineModulesWithOneLoaderMethod = layerClass.getDeclaredMethod("defineModulesWithOneLoader",
246 Configuration.getConfigurationClass(),
247 ClassLoader.class);
248 configurationMethod = layerClass.getDeclaredMethod("configuration");
249 } catch (ClassNotFoundException | NoSuchMethodException | SecurityException ex) {
250 throw new Abort(ex);
251 }
252 }
253 }
254 }
255 }