J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 1999-2006 Sun Microsystems, Inc. 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. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any 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.URL; |
| 32 | import java.util.Enumeration; |
| 33 | import java.util.StringTokenizer; |
| 34 | import java.util.Vector; |
| 35 | |
| 36 | import javax.naming.NamingEnumeration; |
| 37 | |
| 38 | /** |
| 39 | * VersionHelper was used by JNDI to accommodate differences between |
| 40 | * JDK 1.1.x and the Java 2 platform. As this is no longer necessary |
| 41 | * since JNDI's inclusion in the platform, this class currently |
| 42 | * serves as a set of utilities for performing system-level things, |
| 43 | * such as class-loading and reading system properties. |
| 44 | * |
| 45 | * @author Rosanna Lee |
| 46 | * @author Scott Seligman |
| 47 | */ |
| 48 | |
| 49 | public abstract class VersionHelper { |
| 50 | private static VersionHelper helper = null; |
| 51 | |
| 52 | final static String[] PROPS = new String[] { |
| 53 | javax.naming.Context.INITIAL_CONTEXT_FACTORY, |
| 54 | javax.naming.Context.OBJECT_FACTORIES, |
| 55 | javax.naming.Context.URL_PKG_PREFIXES, |
| 56 | javax.naming.Context.STATE_FACTORIES, |
| 57 | javax.naming.Context.PROVIDER_URL, |
| 58 | javax.naming.Context.DNS_URL, |
| 59 | // The following shouldn't create a runtime dependence on ldap package. |
| 60 | javax.naming.ldap.LdapContext.CONTROL_FACTORIES |
| 61 | }; |
| 62 | |
| 63 | public final static int INITIAL_CONTEXT_FACTORY = 0; |
| 64 | public final static int OBJECT_FACTORIES = 1; |
| 65 | public final static int URL_PKG_PREFIXES = 2; |
| 66 | public final static int STATE_FACTORIES = 3; |
| 67 | public final static int PROVIDER_URL = 4; |
| 68 | public final static int DNS_URL = 5; |
| 69 | public final static int CONTROL_FACTORIES = 6; |
| 70 | |
| 71 | VersionHelper() {} // Disallow anyone from creating one of these. |
| 72 | |
| 73 | static { |
| 74 | helper = new VersionHelper12(); |
| 75 | } |
| 76 | |
| 77 | public static VersionHelper getVersionHelper() { |
| 78 | return helper; |
| 79 | } |
| 80 | |
| 81 | public abstract Class loadClass(String className) |
| 82 | throws ClassNotFoundException; |
| 83 | |
| 84 | abstract Class loadClass(String className, ClassLoader cl) |
| 85 | throws ClassNotFoundException; |
| 86 | |
| 87 | public abstract Class loadClass(String className, String codebase) |
| 88 | throws ClassNotFoundException, MalformedURLException; |
| 89 | |
| 90 | /* |
| 91 | * Returns a JNDI property from the system properties. Returns |
| 92 | * null if the property is not set, or if there is no permission |
| 93 | * to read it. |
| 94 | */ |
| 95 | abstract String getJndiProperty(int i); |
| 96 | |
| 97 | /* |
| 98 | * Reads each property in PROPS from the system properties, and |
| 99 | * returns their values -- in order -- in an array. For each |
| 100 | * unset property, the corresponding array element is set to null. |
| 101 | * Returns null if there is no permission to call System.getProperties(). |
| 102 | */ |
| 103 | abstract String[] getJndiProperties(); |
| 104 | |
| 105 | /* |
| 106 | * Returns the resource of a given name associated with a particular |
| 107 | * class (never null), or null if none can be found. |
| 108 | */ |
| 109 | abstract InputStream getResourceAsStream(Class c, String name); |
| 110 | |
| 111 | /* |
| 112 | * Returns an input stream for a file in <java.home>/lib, |
| 113 | * or null if it cannot be located or opened. |
| 114 | * |
| 115 | * @param filename The file name, sans directory. |
| 116 | */ |
| 117 | abstract InputStream getJavaHomeLibStream(String filename); |
| 118 | |
| 119 | /* |
| 120 | * Returns an enumeration (never null) of InputStreams of the |
| 121 | * resources of a given name associated with a particular class |
| 122 | * loader. Null represents the bootstrap class loader in some |
| 123 | * Java implementations. |
| 124 | */ |
| 125 | abstract NamingEnumeration getResources(ClassLoader cl, String name) |
| 126 | throws IOException; |
| 127 | |
| 128 | /* |
| 129 | * Returns the context class loader associated with the current thread. |
| 130 | * Null indicates the bootstrap class loader in some Java implementations. |
| 131 | * |
| 132 | * @throws SecurityException if the class loader is not accessible. |
| 133 | */ |
| 134 | abstract ClassLoader getContextClassLoader(); |
| 135 | |
| 136 | static protected URL[] getUrlArray(String codebase) |
| 137 | throws MalformedURLException { |
| 138 | // Parse codebase into separate URLs |
| 139 | StringTokenizer parser = new StringTokenizer(codebase); |
| 140 | Vector vec = new Vector(10); |
| 141 | while (parser.hasMoreTokens()) { |
| 142 | vec.addElement(parser.nextToken()); |
| 143 | } |
| 144 | String[] url = new String[vec.size()]; |
| 145 | for (int i = 0; i < url.length; i++) { |
| 146 | url[i] = (String)vec.elementAt(i); |
| 147 | } |
| 148 | |
| 149 | URL[] urlArray = new URL[url.length]; |
| 150 | for (int i = 0; i < urlArray.length; i++) { |
| 151 | urlArray[i] = new URL(url[i]); |
| 152 | } |
| 153 | return urlArray; |
| 154 | } |
| 155 | } |