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package com.sun.grizzly.util;
import java.io.File;
import java.io.FilenameFilter;
import java.io.IOException;
import java.net.URL;
import java.net.URLClassLoader;
import java.util.logging.Level;
/**
* Simple {@link 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 or .zip
*
* @param libDir Directory with jars.
* @param cl the parent {@link ClassLoader}, or null if none.
* @return A {@link URLClassLoader} that can load classes from a directory that
* contains jar and zip files.
* @throws java.io.IOException I/O fail
* @deprecated removal candidate, never used
*/
public 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) {
return name.endsWith(".jar") || name.endsWith(".zip");
}
});
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().toURI().toURL().toString();
urls[i] = new URL(path);
}
urlClassloader = new URLClassLoader(urls,cl);
}
}
return urlClassloader;
}
/**
* Construct a {@link URLClassLoader} based on a canonical file location.
* @param dirPath a canonical path location
* @return a {@link URLClassLoader}
* @throws java.io.IOException I/O
* @throws java.net.MalformedURLException Invalid URL
*/
public static URLClassLoader createURLClassLoader(String dirPath) throws IOException{
String path;
File file;
URL appRoot;
URL classesURL;
if (!dirPath.endsWith(File.separator) &&
!dirPath.endsWith(".war") &&
!dirPath.endsWith(".jar")) {
dirPath += File.separator;
}
//Must be a better way because that sucks!
String separator = (System.getProperty("os.name").toLowerCase().startsWith("win")? "/" : "//");
if (dirPath != null &&
(dirPath.endsWith(".war") || dirPath.endsWith(".jar"))) {
file = new File(dirPath);
appRoot = new URL("jar:file:" + separator +
file.getCanonicalPath().replace('\\','/') + "!/");
classesURL = new URL("jar:file:" + separator +
file.getCanonicalPath().replace('\\','/') + "!/WEB-INF/classes/");
path = ExpandJar.expand(appRoot);
//DEBUG
//classesURL = new URL("file:/" + path + "WEB-INF/classes/");
//appRoot = new URL("file:/" + path);
} else {
path = dirPath;
classesURL = new URL("file://" + path + "WEB-INF/classes/");
appRoot = new URL("file://" + path);
}
String absolutePath = new File(path).getAbsolutePath();
URL[] urls;
File libFiles = new File(absolutePath + File.separator + "WEB-INF"+ File.separator + "lib");
int arraySize = 4;
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;
urls[urls.length -3] = new URL("file://" + path + "/WEB-INF/classes/");
urls[urls.length -4] = new URL("file://" + path);
return new URLClassLoader(urls, Thread.currentThread().getContextClassLoader());
}
/**
* Construct a {@link URLClassLoader} based on a canonical file location.
*
* @param location a canonical path location
* @param parent {@link ClassLoader} to be used as parent for returned one.
* @return a {@link URLClassLoader}
* @throws java.io.IOException I/O
* @throws java.net.MalformedURLException Invalid URL
*/
public static URLClassLoader createURLClassLoader(String location, ClassLoader parent) throws IOException {
ClassLoader loader = Thread.currentThread().getContextClassLoader();
Thread.currentThread().setContextClassLoader(parent);
try {
return createURLClassLoader(location);
} finally {
Thread.currentThread().setContextClassLoader(loader);
}
}
/**
* 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;
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;
}
}