src/share/classes/com/sun/naming/internal/VersionHelper.java
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@@ -1,7 +1,7 @@
/*
- * Copyright (c) 1999, 2011, Oracle and/or its affiliates. All rights reserved.
+ * 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
@@ -25,14 +25,24 @@
package com.sun.naming.internal;
import java.io.InputStream;
import java.io.IOException;
+import java.io.File;
+import java.io.FileInputStream;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.StringTokenizer;
import java.util.Vector;
+import java.util.NoSuchElementException;
+import java.util.Enumeration;
+import java.util.Properties;
+import java.net.URLClassLoader;
+import java.security.AccessController;
+import java.security.PrivilegedAction;
+import java.security.PrivilegedActionException;
+import java.security.PrivilegedExceptionAction;
import javax.naming.NamingEnumeration;
/**
* VersionHelper was used by JNDI to accommodate differences between
@@ -43,14 +53,14 @@
*
* @author Rosanna Lee
* @author Scott Seligman
*/
-public abstract class VersionHelper {
- private static VersionHelper helper = null;
+public final class VersionHelper {
+ private static VersionHelper helper = new VersionHelper();
- final static String[] PROPS = new String[] {
+ 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,
@@ -67,73 +77,159 @@
public final static int DNS_URL = 5;
public final static int CONTROL_FACTORIES = 6;
VersionHelper() {} // Disallow anyone from creating one of these.
- static {
- helper = new VersionHelper12();
- }
-
public static VersionHelper getVersionHelper() {
return helper;
}
- public abstract Class<?> loadClass(String className)
- throws ClassNotFoundException;
+ public Class<?> loadClass(String className)
+ throws ClassNotFoundException {
+ return loadClass(className, getContextClassLoader());
+ }
- abstract Class<?> loadClass(String className, ClassLoader cl)
- throws ClassNotFoundException;
+ /**
+ * 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;
+ }
- public abstract Class<?> loadClass(String className, String codebase)
- throws ClassNotFoundException, MalformedURLException;
+ /**
+ * @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);
+ }
/*
* 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.
*/
- abstract String getJndiProperty(int i);
+ 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().
*/
- abstract String[] getJndiProperties();
+ 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;
+ }
/*
* Returns the resource of a given name associated with a particular
* class (never null), or null if none can be found.
*/
- abstract InputStream getResourceAsStream(Class<?> c, String name);
+ InputStream getResourceAsStream(Class<?> c, String name) {
+ PrivilegedAction<InputStream> act = () -> c.getResourceAsStream(name);
+ return AccessController.doPrivileged(act);
+ }
/*
* Returns an input stream for a file in <java.home>/lib,
* or null if it cannot be located or opened.
*
* @param filename The file name, sans directory.
*/
- abstract InputStream getJavaHomeLibStream(String filename);
+ InputStream getJavaHomeLibStream(String filename) {
+ PrivilegedAction<InputStream> act = () -> {
+ try {
+ String javahome = System.getProperty("java.home");
+ if (javahome == null) {
+ return null;
+ }
+ String pathname = javahome + File.separator +
+ "lib" + 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.
*/
- abstract NamingEnumeration<InputStream> getResources(
+ NamingEnumeration<InputStream> getResources(
ClassLoader cl, String name)
- throws IOException;
+ 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);
+ }
/*
- * Returns the context class loader associated with the current thread.
- * Null indicates the bootstrap class loader in some Java implementations.
- *
+ * 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.
*/
- abstract ClassLoader getContextClassLoader();
+ 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);
+ }
static protected URL[] getUrlArray(String codebase)
throws MalformedURLException {
// Parse codebase into separate URLs
StringTokenizer parser = new StringTokenizer(codebase);
@@ -150,6 +246,72 @@
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() {
+ }
+ }
}