1 /* 2 * Copyright (c) 1999, 2009, 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.jndi.ldap; 27 28 import java.net.URL; 29 import java.net.URLClassLoader; 30 import java.net.MalformedURLException; 31 import java.security.AccessController; 32 import java.security.PrivilegedAction; 33 34 final class VersionHelper12 extends VersionHelper { 35 36 // System property to control whether classes may be loaded from an 37 // arbitrary URL code base. 38 private static final String TRUST_URL_CODEBASE_PROPERTY = 39 "com.sun.jndi.ldap.object.trustURLCodebase"; 40 41 // Determine whether classes may be loaded from an arbitrary URL code base. 42 private static final String trustURLCodebase = 43 AccessController.doPrivileged( 44 new PrivilegedAction<String>() { 45 public String run() { 46 return System.getProperty(TRUST_URL_CODEBASE_PROPERTY, 47 "false"); 48 } 49 } 50 ); 51 52 VersionHelper12() {} // Disallow external from creating one of these. 53 54 ClassLoader getURLClassLoader(String[] url) 55 throws MalformedURLException { 56 ClassLoader parent = getContextClassLoader(); 57 /* 58 * Classes may only be loaded from an arbitrary URL code base when 59 * the system property com.sun.jndi.ldap.object.trustURLCodebase 60 * has been set to "true". 61 */ 62 if (url != null && "true".equalsIgnoreCase(trustURLCodebase)) { 63 return URLClassLoader.newInstance(getUrlArray(url), parent); 64 } else { 65 return parent; 66 } 67 } 68 69 Class loadClass(String className) throws ClassNotFoundException { 70 ClassLoader cl = getContextClassLoader(); 71 return Class.forName(className, true, cl); 72 } 73 74 private ClassLoader getContextClassLoader() { 75 return (ClassLoader) AccessController.doPrivileged( 76 new PrivilegedAction() { 77 public Object run() { 78 return Thread.currentThread().getContextClassLoader(); 79 } 80 } 81 ); 82 } 83 84 Thread createThread(final Runnable r) { 85 return (Thread) AccessController.doPrivileged( 86 new PrivilegedAction() { 87 public Object run() { 88 return new Thread(r); 89 } 90 } 91 ); 92 } 93 }