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| 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 | +} | |