1 /*
2 * Copyright (c) 1999, 2006, 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.Hashtable;
39 import java.util.NoSuchElementException;
40 import java.util.Properties;
41
42 import javax.naming.*;
43
44 /**
45 * VersionHelper was used by JNDI to accommodate differences between
46 * JDK 1.1.x and the Java 2 platform. As this is no longer necessary
47 * since JNDI's inclusion in the platform, this class currently
48 * serves as a set of utilities for performing system-level things,
49 * such as class-loading and reading system properties.
50 *
51 * @author Rosanna Lee
52 * @author Scott Seligman
53 */
54
55 final class VersionHelper12 extends VersionHelper {
56
57 private boolean getSystemPropsFailed = false;
58
59 VersionHelper12() {} // Disallow external from creating one of these.
60
61 public Class loadClass(String className) throws ClassNotFoundException {
62 ClassLoader cl = getContextClassLoader();
63 return Class.forName(className, true, cl);
64 }
65
66 /**
67 * Package private.
68 */
69 Class loadClass(String className, ClassLoader cl)
70 throws ClassNotFoundException {
71 return Class.forName(className, true, cl);
72 }
73
74 /**
75 * @param className A non-null fully qualified class name.
76 * @param codebase A non-null, space-separated list of URL strings.
77 */
78 public Class loadClass(String className, String codebase)
79 throws ClassNotFoundException, MalformedURLException {
80 ClassLoader cl;
81
82 ClassLoader parent = getContextClassLoader();
83 cl = URLClassLoader.newInstance(getUrlArray(codebase), parent);
84
85 return Class.forName(className, true, cl);
86 }
87
88 String getJndiProperty(final int i) {
89 return (String) AccessController.doPrivileged(
90 new PrivilegedAction() {
91 public Object run() {
92 try {
93 return System.getProperty(PROPS[i]);
94 } catch (SecurityException e) {
95 return null;
96 }
97 }
98 }
99 );
100 }
101
102 String[] getJndiProperties() {
103 if (getSystemPropsFailed) {
104 return null; // after one failure, don't bother trying again
105 }
106 Properties sysProps = (Properties) AccessController.doPrivileged(
107 new PrivilegedAction() {
108 public Object run() {
109 try {
110 return System.getProperties();
111 } catch (SecurityException e) {
112 getSystemPropsFailed = true;
113 return null;
114 }
115 }
116 }
117 );
118 if (sysProps == null) {
119 return null;
120 }
121 String[] jProps = new String[PROPS.length];
122 for (int i = 0; i < PROPS.length; i++) {
123 jProps[i] = sysProps.getProperty(PROPS[i]);
124 }
125 return jProps;
126 }
127
128 InputStream getResourceAsStream(final Class c, final String name) {
129 return (InputStream) AccessController.doPrivileged(
130 new PrivilegedAction() {
131 public Object run() {
132 return c.getResourceAsStream(name);
133 }
134 }
135 );
136 }
137
138 InputStream getJavaHomeLibStream(final String filename) {
139 return (InputStream) AccessController.doPrivileged(
140 new PrivilegedAction() {
141 public Object run() {
142 try {
143 String javahome = System.getProperty("java.home");
144 if (javahome == null) {
145 return null;
146 }
147 String pathname = javahome + java.io.File.separator +
148 "lib" + java.io.File.separator + filename;
149 return new java.io.FileInputStream(pathname);
150 } catch (Exception e) {
151 return null;
152 }
153 }
154 }
155 );
156 }
157
158 NamingEnumeration getResources(final ClassLoader cl, final String name)
159 throws IOException
160 {
161 Enumeration urls;
162 try {
163 urls = (Enumeration) AccessController.doPrivileged(
164 new PrivilegedExceptionAction() {
165 public Object run() throws IOException {
166 return (cl == null)
167 ? ClassLoader.getSystemResources(name)
168 : cl.getResources(name);
169 }
170 }
171 );
172 } catch (PrivilegedActionException e) {
173 throw (IOException)e.getException();
174 }
175 return new InputStreamEnumeration(urls);
176 }
177
178 ClassLoader getContextClassLoader() {
179 return (ClassLoader) AccessController.doPrivileged(
180 new PrivilegedAction() {
181 public Object run() {
182 return Thread.currentThread().getContextClassLoader();
183 }
184 }
185 );
186 }
187
188
189 /**
190 * Given an enumeration of URLs, an instance of this class represents
191 * an enumeration of their InputStreams. Each operation on the URL
192 * enumeration is performed within a doPrivileged block.
193 * This is used to enumerate the resources under a foreign codebase.
194 * This class is not MT-safe.
195 */
196 class InputStreamEnumeration implements NamingEnumeration {
197
198 private final Enumeration urls;
199
200 private Object nextElement = null;
201
202 InputStreamEnumeration(Enumeration urls) {
203 this.urls = urls;
204 }
205
206 /*
207 * Returns the next InputStream, or null if there are no more.
208 * An InputStream that cannot be opened is skipped.
209 */
210 private Object getNextElement() {
211 return AccessController.doPrivileged(
212 new PrivilegedAction() {
213 public Object run() {
214 while (urls.hasMoreElements()) {
215 try {
216 return ((URL)urls.nextElement()).openStream();
217 } catch (IOException e) {
218 // skip this URL
219 }
220 }
221 return null;
222 }
223 }
224 );
225 }
226
227 public boolean hasMore() {
228 if (nextElement != null) {
229 return true;
230 }
231 nextElement = getNextElement();
232 return (nextElement != null);
233 }
234
235 public boolean hasMoreElements() {
236 return hasMore();
237 }
238
239 public Object next() {
240 if (hasMore()) {
241 Object res = nextElement;
242 nextElement = null;
243 return res;
244 } else {
245 throw new NoSuchElementException();
246 }
247 }
248
249 public Object nextElement() {
250 return next();
251 }
252
253 public void close() {
254 }
255 }
256 }