--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/java.naming/share/classes/com/sun/naming/internal/VersionHelper.java Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,340 @@
+/*
+ * Copyright (c) 1999, 2014, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation. Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package com.sun.naming.internal;
+
+import javax.naming.NamingEnumeration;
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.net.MalformedURLException;
+import java.net.URL;
+import java.net.URLClassLoader;
+import java.security.AccessController;
+import java.security.PrivilegedAction;
+import java.security.PrivilegedActionException;
+import java.security.PrivilegedExceptionAction;
+import java.util.*;
+
+/**
+ * VersionHelper was used by JNDI to accommodate differences between
+ * JDK 1.1.x and the Java 2 platform. As this is no longer necessary
+ * since JNDI's inclusion in the platform, this class currently
+ * serves as a set of utilities for performing system-level things,
+ * such as class-loading and reading system properties.
+ *
+ * @author Rosanna Lee
+ * @author Scott Seligman
+ */
+
+public final class VersionHelper {
+ private static final VersionHelper helper = new VersionHelper();
+
+ final static String[] PROPS = new String[]{
+ javax.naming.Context.INITIAL_CONTEXT_FACTORY,
+ javax.naming.Context.OBJECT_FACTORIES,
+ javax.naming.Context.URL_PKG_PREFIXES,
+ javax.naming.Context.STATE_FACTORIES,
+ javax.naming.Context.PROVIDER_URL,
+ javax.naming.Context.DNS_URL,
+ // The following shouldn't create a runtime dependence on ldap package.
+ javax.naming.ldap.LdapContext.CONTROL_FACTORIES
+ };
+
+ public final static int INITIAL_CONTEXT_FACTORY = 0;
+ public final static int OBJECT_FACTORIES = 1;
+ public final static int URL_PKG_PREFIXES = 2;
+ public final static int STATE_FACTORIES = 3;
+ public final static int PROVIDER_URL = 4;
+ public final static int DNS_URL = 5;
+ public final static int CONTROL_FACTORIES = 6;
+
+ private VersionHelper() {} // Disallow anyone from creating one of these.
+
+ public static VersionHelper getVersionHelper() {
+ return helper;
+ }
+
+ public Class<?> loadClass(String className) throws ClassNotFoundException {
+ return loadClass(className, getContextClassLoader());
+ }
+
+ /**
+ * @param className A non-null fully qualified class name.
+ * @param codebase A non-null, space-separated list of URL strings.
+ */
+ public Class<?> loadClass(String className, String codebase)
+ throws ClassNotFoundException, MalformedURLException {
+
+ ClassLoader parent = getContextClassLoader();
+ ClassLoader cl =
+ URLClassLoader.newInstance(getUrlArray(codebase), parent);
+
+ return loadClass(className, cl);
+ }
+
+ /**
+ * Package private.
+ * <p>
+ * This internal method is used with Thread Context Class Loader (TCCL),
+ * please don't expose this method as public.
+ */
+ Class<?> loadClass(String className, ClassLoader cl)
+ throws ClassNotFoundException {
+ Class<?> cls = Class.forName(className, true, cl);
+ return cls;
+ }
+
+ /*
+ * Returns a JNDI property from the system properties. Returns
+ * null if the property is not set, or if there is no permission
+ * to read it.
+ */
+ String getJndiProperty(int i) {
+ PrivilegedAction<String> act = () -> {
+ try {
+ return System.getProperty(PROPS[i]);
+ } catch (SecurityException e) {
+ return null;
+ }
+ };
+ return AccessController.doPrivileged(act);
+ }
+
+ /*
+ * Reads each property in PROPS from the system properties, and
+ * returns their values -- in order -- in an array. For each
+ * unset property, the corresponding array element is set to null.
+ * Returns null if there is no permission to call System.getProperties().
+ */
+ String[] getJndiProperties() {
+ PrivilegedAction<Properties> act = () -> {
+ try {
+ return System.getProperties();
+ } catch (SecurityException e) {
+ return null;
+ }
+ };
+ Properties sysProps = AccessController.doPrivileged(act);
+ if (sysProps == null) {
+ return null;
+ }
+ String[] jProps = new String[PROPS.length];
+ for (int i = 0; i < PROPS.length; i++) {
+ jProps[i] = sysProps.getProperty(PROPS[i]);
+ }
+ return jProps;
+ }
+
+ private static String resolveName(Class<?> c, String name) {
+ if (name == null) {
+ return name;
+ }
+ if (!name.startsWith("/")) {
+ while (c.isArray()) {
+ c = c.getComponentType();
+ }
+ String baseName = c.getName();
+ int index = baseName.lastIndexOf('.');
+ if (index != -1) {
+ name = baseName.substring(0, index).replace('.', '/')
+ +"/"+name;
+ }
+ } else {
+ name = name.substring(1);
+ }
+ return name;
+ }
+
+ /*
+ * Returns the resource of a given name associated with a particular
+ * class (never null), or null if none can be found.
+ */
+ InputStream getResourceAsStream(Class<?> c, String name) {
+ PrivilegedAction<InputStream> act = () -> {
+ try {
+ Module m = c.getModule();
+ return c.getModule().getResourceAsStream(resolveName(c,name));
+ } catch (IOException x) {
+ return null;
+ }
+ };
+ return AccessController.doPrivileged(act);
+ }
+
+ /*
+ * Returns an input stream for a file in <java.home>/conf,
+ * or null if it cannot be located or opened.
+ *
+ * @param filename The file name, sans directory.
+ */
+ InputStream getJavaHomeConfStream(String filename) {
+ PrivilegedAction<InputStream> act = () -> {
+ try {
+ String javahome = System.getProperty("java.home");
+ if (javahome == null) {
+ return null;
+ }
+ String pathname = javahome + File.separator +
+ "conf" + File.separator + filename;
+ return new FileInputStream(pathname);
+ } catch (Exception e) {
+ return null;
+ }
+ };
+ return AccessController.doPrivileged(act);
+ }
+
+ /*
+ * Returns an enumeration (never null) of InputStreams of the
+ * resources of a given name associated with a particular class
+ * loader. Null represents the bootstrap class loader in some
+ * Java implementations.
+ */
+ NamingEnumeration<InputStream> getResources(ClassLoader cl,
+ String name) throws IOException {
+ Enumeration<URL> urls;
+ PrivilegedExceptionAction<Enumeration<URL>> act = () ->
+ (cl == null)
+ ? ClassLoader.getSystemResources(name)
+ : cl.getResources(name);
+ try {
+ urls = AccessController.doPrivileged(act);
+ } catch (PrivilegedActionException e) {
+ throw (IOException) e.getException();
+ }
+ return new InputStreamEnumeration(urls);
+ }
+
+
+ /**
+ * Package private.
+ * <p>
+ * This internal method returns Thread Context Class Loader (TCCL),
+ * if null, returns the system Class Loader.
+ * <p>
+ * Please don't expose this method as public.
+ * @throws SecurityException if the class loader is not accessible
+ */
+ ClassLoader getContextClassLoader() {
+
+ PrivilegedAction<ClassLoader> act = () -> {
+ ClassLoader loader = Thread.currentThread().getContextClassLoader();
+ if (loader == null) {
+ // Don't use bootstrap class loader directly!
+ loader = ClassLoader.getSystemClassLoader();
+ }
+ return loader;
+ };
+ return AccessController.doPrivileged(act);
+ }
+
+ private static URL[] getUrlArray(String codebase)
+ throws MalformedURLException {
+ // Parse codebase into separate URLs
+ StringTokenizer parser = new StringTokenizer(codebase);
+ List<String> list = new ArrayList<>();
+ while (parser.hasMoreTokens()) {
+ list.add(parser.nextToken());
+ }
+ String[] url = new String[list.size()];
+ for (int i = 0; i < url.length; i++) {
+ url[i] = list.get(i);
+ }
+
+ URL[] urlArray = new URL[url.length];
+ for (int i = 0; i < urlArray.length; i++) {
+ urlArray[i] = new URL(url[i]);
+ }
+ return urlArray;
+ }
+
+ /**
+ * Given an enumeration of URLs, an instance of this class represents
+ * an enumeration of their InputStreams. Each operation on the URL
+ * enumeration is performed within a doPrivileged block.
+ * This is used to enumerate the resources under a foreign codebase.
+ * This class is not MT-safe.
+ */
+ private class InputStreamEnumeration implements
+ NamingEnumeration<InputStream> {
+
+ private final Enumeration<URL> urls;
+
+ private InputStream nextElement;
+
+ InputStreamEnumeration(Enumeration<URL> urls) {
+ this.urls = urls;
+ }
+
+ /*
+ * Returns the next InputStream, or null if there are no more.
+ * An InputStream that cannot be opened is skipped.
+ */
+ private InputStream getNextElement() {
+ PrivilegedAction<InputStream> act = () -> {
+ while (urls.hasMoreElements()) {
+ try {
+ return urls.nextElement().openStream();
+ } catch (IOException e) {
+ // skip this URL
+ }
+ }
+ return null;
+ };
+ return AccessController.doPrivileged(act);
+ }
+
+ public boolean hasMore() {
+ if (nextElement != null) {
+ return true;
+ }
+ nextElement = getNextElement();
+ return (nextElement != null);
+ }
+
+ public boolean hasMoreElements() {
+ return hasMore();
+ }
+
+ public InputStream next() {
+ if (hasMore()) {
+ InputStream res = nextElement;
+ nextElement = null;
+ return res;
+ } else {
+ throw new NoSuchElementException();
+ }
+ }
+
+ public InputStream nextElement() {
+ return next();
+ }
+
+ public void close() {
+ }
+ }
+}