/*
* Copyright (c) 1999, 2011, 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 java.io.InputStream;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URLClassLoader;
import java.net.URL;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.security.PrivilegedActionException;
import java.security.PrivilegedExceptionAction;
import java.util.Enumeration;
import java.util.NoSuchElementException;
import java.util.Properties;
import javax.naming.*;
/**
* 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
*/
final class VersionHelper12 extends VersionHelper {
private boolean getSystemPropsFailed = false;
VersionHelper12() {} // Disallow external from creating one of these.
public Class<?> loadClass(String className) throws ClassNotFoundException {
ClassLoader cl = getContextClassLoader();
return Class.forName(className, true, cl);
}
/**
* Package private.
*/
Class<?> loadClass(String className, ClassLoader cl)
throws ClassNotFoundException {
return Class.forName(className, true, cl);
}
/**
* @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 cl;
ClassLoader parent = getContextClassLoader();
cl = URLClassLoader.newInstance(getUrlArray(codebase), parent);
return Class.forName(className, true, cl);
}
String getJndiProperty(final int i) {
return AccessController.doPrivileged(
new PrivilegedAction<String>() {
public String run() {
try {
return System.getProperty(PROPS[i]);
} catch (SecurityException e) {
return null;
}
}
}
);
}
String[] getJndiProperties() {
if (getSystemPropsFailed) {
return null; // after one failure, don't bother trying again
}
Properties sysProps = AccessController.doPrivileged(
new PrivilegedAction<Properties>() {
public Properties run() {
try {
return System.getProperties();
} catch (SecurityException e) {
getSystemPropsFailed = true;
return null;
}
}
}
);
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;
}
InputStream getResourceAsStream(final Class<?> c, final String name) {
return AccessController.doPrivileged(
new PrivilegedAction<InputStream>() {
public InputStream run() {
return c.getResourceAsStream(name);
}
}
);
}
InputStream getJavaHomeLibStream(final String filename) {
return AccessController.doPrivileged(
new PrivilegedAction<InputStream>() {
public InputStream run() {
try {
String javahome = System.getProperty("java.home");
if (javahome == null) {
return null;
}
String pathname = javahome + java.io.File.separator +
"lib" + java.io.File.separator + filename;
return new java.io.FileInputStream(pathname);
} catch (Exception e) {
return null;
}
}
}
);
}
NamingEnumeration<InputStream> getResources(final ClassLoader cl,
final String name) throws IOException {
Enumeration<URL> urls;
try {
urls = AccessController.doPrivileged(
new PrivilegedExceptionAction<Enumeration<URL>>() {
public Enumeration<URL> run() throws IOException {
return (cl == null)
? ClassLoader.getSystemResources(name)
: cl.getResources(name);
}
}
);
} catch (PrivilegedActionException e) {
throw (IOException)e.getException();
}
return new InputStreamEnumeration(urls);
}
ClassLoader getContextClassLoader() {
return AccessController.doPrivileged(
new PrivilegedAction<ClassLoader>() {
public ClassLoader run() {
return Thread.currentThread().getContextClassLoader();
}
}
);
}
/**
* 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.
*/
class InputStreamEnumeration implements NamingEnumeration<InputStream> {
private final Enumeration<URL> urls;
private InputStream nextElement = null;
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() {
return AccessController.doPrivileged(
new PrivilegedAction<InputStream>() {
public InputStream run() {
while (urls.hasMoreElements()) {
try {
return urls.nextElement().openStream();
} catch (IOException e) {
// skip this URL
}
}
return null;
}
}
);
}
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() {
}
}
}