1 /*
2 * Copyright (c) 1999, 2011, 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.naming.internal;
27
28 import java.io.InputStream;
29 import java.io.IOException;
30 import java.net.MalformedURLException;
31 import java.net.URLClassLoader;
32 import java.net.URL;
33 import java.security.AccessController;
34 import java.security.PrivilegedAction;
35 import java.security.PrivilegedActionException;
36 import java.security.PrivilegedExceptionAction;
37 import java.util.Enumeration;
38 import java.util.NoSuchElementException;
39 import java.util.Properties;
40
41 import javax.naming.*;
42
43 /**
44 * VersionHelper was used by JNDI to accommodate differences between
45 * JDK 1.1.x and the Java 2 platform. As this is no longer necessary
46 * since JNDI's inclusion in the platform, this class currently
47 * serves as a set of utilities for performing system-level things,
48 * such as class-loading and reading system properties.
49 *
50 * @author Rosanna Lee
51 * @author Scott Seligman
52 */
53
54 final class VersionHelper12 extends VersionHelper {
55
56 // Disallow external from creating one of these.
57 VersionHelper12() {
58 }
59
60 public Class<?> loadClass(String className) throws ClassNotFoundException {
61 return loadClass(className, getContextClassLoader());
62 }
63
64 /**
65 * Package private.
66 *
67 * This internal method is used with Thread Context Class Loader (TCCL),
68 * please don't expose this method as public.
69 */
70 Class<?> loadClass(String className, ClassLoader cl)
71 throws ClassNotFoundException {
72 Class<?> cls = Class.forName(className, true, cl);
73 return cls;
74 }
75
76 /**
77 * @param className A non-null fully qualified class name.
78 * @param codebase A non-null, space-separated list of URL strings.
79 */
80 public Class<?> loadClass(String className, String codebase)
81 throws ClassNotFoundException, MalformedURLException {
82
83 ClassLoader parent = getContextClassLoader();
84 ClassLoader cl =
85 URLClassLoader.newInstance(getUrlArray(codebase), parent);
86
87 return loadClass(className, cl);
88 }
89
90 String getJndiProperty(final int i) {
91 return AccessController.doPrivileged(
92 new PrivilegedAction<String>() {
93 public String run() {
94 try {
95 return System.getProperty(PROPS[i]);
96 } catch (SecurityException e) {
97 return null;
98 }
99 }
100 }
101 );
102 }
103
104 String[] getJndiProperties() {
105 Properties sysProps = AccessController.doPrivileged(
106 new PrivilegedAction<Properties>() {
107 public Properties run() {
108 try {
109 return System.getProperties();
110 } catch (SecurityException e) {
111 return null;
112 }
113 }
114 }
115 );
116 if (sysProps == null) {
117 return null;
118 }
119 String[] jProps = new String[PROPS.length];
120 for (int i = 0; i < PROPS.length; i++) {
121 jProps[i] = sysProps.getProperty(PROPS[i]);
122 }
123 return jProps;
124 }
125
126 InputStream getResourceAsStream(final Class<?> c, final String name) {
127 return AccessController.doPrivileged(
128 new PrivilegedAction<InputStream>() {
129 public InputStream run() {
130 return c.getResourceAsStream(name);
131 }
132 }
133 );
134 }
135
136 InputStream getJavaHomeLibStream(final String filename) {
137 return AccessController.doPrivileged(
138 new PrivilegedAction<InputStream>() {
139 public InputStream run() {
140 try {
141 String javahome = System.getProperty("java.home");
142 if (javahome == null) {
143 return null;
144 }
145 String pathname = javahome + java.io.File.separator +
146 "lib" + java.io.File.separator + filename;
147 return new java.io.FileInputStream(pathname);
148 } catch (Exception e) {
149 return null;
150 }
151 }
152 }
153 );
154 }
155
156 NamingEnumeration<InputStream> getResources(final ClassLoader cl,
157 final String name) throws IOException {
158 Enumeration<URL> urls;
159 try {
160 urls = AccessController.doPrivileged(
161 new PrivilegedExceptionAction<Enumeration<URL>>() {
162 public Enumeration<URL> run() throws IOException {
163 return (cl == null)
164 ? ClassLoader.getSystemResources(name)
165 : cl.getResources(name);
166 }
167 }
168 );
169 } catch (PrivilegedActionException e) {
170 throw (IOException)e.getException();
171 }
172 return new InputStreamEnumeration(urls);
173 }
174
175 /**
176 * Package private.
177 *
178 * This internal method returns Thread Context Class Loader (TCCL),
179 * if null, returns the system Class Loader.
180 *
181 * Please don't expose this method as public.
182 */
183 ClassLoader getContextClassLoader() {
184
185 return AccessController.doPrivileged(
186 new PrivilegedAction<ClassLoader>() {
187 public ClassLoader run() {
188 ClassLoader loader =
189 Thread.currentThread().getContextClassLoader();
190 if (loader == null) {
191 // Don't use bootstrap class loader directly!
192 loader = ClassLoader.getSystemClassLoader();
193 }
194
195 return loader;
196 }
197 }
198 );
199 }
200
201 /**
202 * Given an enumeration of URLs, an instance of this class represents
203 * an enumeration of their InputStreams. Each operation on the URL
204 * enumeration is performed within a doPrivileged block.
205 * This is used to enumerate the resources under a foreign codebase.
206 * This class is not MT-safe.
207 */
208 class InputStreamEnumeration implements NamingEnumeration<InputStream> {
209
210 private final Enumeration<URL> urls;
211
212 private InputStream nextElement = null;
213
214 InputStreamEnumeration(Enumeration<URL> urls) {
215 this.urls = urls;
216 }
217
218 /*
219 * Returns the next InputStream, or null if there are no more.
220 * An InputStream that cannot be opened is skipped.
221 */
222 private InputStream getNextElement() {
223 return AccessController.doPrivileged(
224 new PrivilegedAction<InputStream>() {
225 public InputStream run() {
226 while (urls.hasMoreElements()) {
227 try {
228 return urls.nextElement().openStream();
229 } catch (IOException e) {
230 // skip this URL
231 }
232 }
233 return null;
234 }
235 }
236 );
237 }
238
239 public boolean hasMore() {
240 if (nextElement != null) {
241 return true;
242 }
243 nextElement = getNextElement();
244 return (nextElement != null);
245 }
246
247 public boolean hasMoreElements() {
248 return hasMore();
249 }
250
251 public InputStream next() {
252 if (hasMore()) {
253 InputStream res = nextElement;
254 nextElement = null;
255 return res;
256 } else {
257 throw new NoSuchElementException();
258 }
259 }
260
261 public InputStream nextElement() {
262 return next();
263 }
264
265 public void close() {
266 }
267 }
268 }