com.sun.grizzly.util.ClassLoaderUtil Maven / Gradle / Ivy
/*
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright 2007-2008 Sun Microsystems, Inc. All rights reserved.
*
* The contents of this file are subject to the terms of either the GNU
* General Public License Version 2 only ("GPL") or the Common Development
* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can obtain
* a copy of the License at https://glassfish.dev.java.net/public/CDDL+GPL.html
* or glassfish/bootstrap/legal/LICENSE.txt. See the License for the specific
* language governing permissions and limitations under the License.
*
* When distributing the software, include this License Header Notice in each
* file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.
* Sun designates this particular file as subject to the "Classpath" exception
* as provided by Sun in the GPL Version 2 section of the License file that
* accompanied this code. If applicable, add the following below the License
* Header, with the fields enclosed by brackets [] replaced by your own
* identifying information: "Portions Copyrighted [year]
* [name of copyright owner]"
*
* Contributor(s):
*
* If you wish your version of this file to be governed by only the CDDL or
* only the GPL Version 2, indicate your decision by adding "[Contributor]
* elects to include this software in this distribution under the [CDDL or GPL
* Version 2] license." If you don't indicate a single choice of license, a
* recipient has the option to distribute your version of this file under
* either the CDDL, the GPL Version 2 or to extend the choice of license to
* its licensees as provided above. However, if you add GPL Version 2 code
* and therefore, elected the GPL Version 2 license, then the option applies
* only if the new code is made subject to such option by the copyright
* holder.
*
*/
package com.sun.grizzly.util;
import java.io.File;
import java.io.FilenameFilter;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLClassLoader;
import java.util.logging.Level;
/**
* Simple Classloader utility.
*
* @author Jeanfrancois Arcand
*/
public class ClassLoaderUtil {
/**
* Create a class loader that can load classes from the specified
* file directory. The file directory must contains .jar ot .zip
*
* @param file a directory
* @param ClassLoader the parent classloader, or null if none.
* @return A Classloader that can load classes from a directory that
* contains jar and zip files.
*/
public final static ClassLoader createClassloader(File libDir, ClassLoader cl)
throws IOException{
URLClassLoader urlClassloader = null;
if (libDir.exists()){
if (libDir.isDirectory()){
String[] jars = libDir.list(new FilenameFilter() {
public boolean accept(File dir, String name) {
if (name.endsWith(".jar") || name.endsWith(".zip")){
return true;
} else {
return false;
}
}
});
URL[] urls = new URL[jars.length];
for (int i=0; i < jars.length; i++){
String path = new File(libDir.getName()
+ File.separator + jars[i]).getCanonicalFile().toURL()
.toString();
urls[i] = new URL(path);
}
urlClassloader = new URLClassLoader(urls,cl);
}
}
return urlClassloader;
}
/**
* Construct a {@link URLClassloader} based on a canonial file location.
* @param dirPath a canonial path location
* @return a {@link URLClassLoader}
*/
public static URLClassLoader createURLClassLoader(String dirPath) throws MalformedURLException
, IOException{
String path;
File file = null;
URL appRoot = null;
URL classesURL = null;
if (!dirPath.endsWith(File.separator)){
dirPath += File.separator;
}
if (dirPath != null &&
(dirPath.endsWith(".war") || dirPath.endsWith(".jar"))) {
file = new File(dirPath);
appRoot = new URL("jar:file:" +
file.getCanonicalPath() + "!/");
classesURL = new URL("jar:file:" +
file.getCanonicalPath() + "!/WEB-INF/classes/");
path = ExpandJar.expand(appRoot);
} else {
path = dirPath;
classesURL = new URL("file://" + path + "WEB-INF/classes/");
appRoot = new URL("file://" + path);
}
String absolutePath = new File(path).getAbsolutePath();
URL[] urls = null;
File libFiles = new File(absolutePath + File.separator + "WEB-INF"+ File.separator + "lib");
int arraySize = (appRoot == null ? 1:2);
//Must be a better way because that sucks!
String separator = (System.getProperty("os.name")
.toLowerCase().startsWith("win")? "/" : "//");
if (libFiles.exists() && libFiles.isDirectory()){
urls = new URL[libFiles.listFiles().length + arraySize];
for (int i=0; i < libFiles.listFiles().length; i++){
urls[i] = new URL("jar:file:" + separator + libFiles.listFiles()[i].toString().replace('\\','/') + "!/");
}
} else {
urls = new URL[arraySize];
}
urls[urls.length -1] = classesURL;
urls[urls.length -2] = appRoot;
URLClassLoader urlClassloader = new URLClassLoader(urls,
Thread.currentThread().getContextClassLoader());
return urlClassloader;
}
/**
* Load a class using the current {link Thread#getContextClassLoader}
* @param clazzName The name of the class you want to load.
* @return an instance of clazzname
*/
public static Object load(String clazzName) {
return load(clazzName,Thread.currentThread().getContextClassLoader());
}
/**
* Load a class using the provided {@link Classloader}
* @param clazzName The name of the class you want to load.
* @param classLoader A classloader to use for loading a class.
* @return an instance of clazzname
*/
public static Object load(String clazzName, ClassLoader classLoader) {
Class className = null;
try {
className = Class.forName(clazzName, true, classLoader);
return className.newInstance();
} catch (Throwable t) {
LoggerUtils.getLogger().log(Level.SEVERE,"Unable to load class "
+ clazzName,t);
}
return null;
}
}