Mega Code Archive
Context ClassLoader
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/**************************************************************************************
* Copyright (c) Jonas BonŽr, Alexandre Vasseur. All rights reserved. *
* http://aspectwerkz.codehaus.org *
* ---------------------------------------------------------------------------------- *
* The software in this package is published under the terms of the LGPL license *
* a copy of which has been included with this distribution in the license.txt file. *
**************************************************************************************/
import java.io.InputStream;
import java.net.URL;
/**
* Utility methods dealing with the context class loader. Fail-over is provided to the default class loader.
*
* @author <a href="mailto:jboner@codehaus.org">Jonas BonŽr </a>
*/
public final class ContextClassLoader {
/**
* Loads a class starting from the given class loader (can be null, then use default class loader)
*
* @param loader
* @param name of class to load
* @return
* @throws ClassNotFoundException
*/
public static Class forName(final ClassLoader loader, final String name) throws ClassNotFoundException {
Class klass = null;
if (loader != null) {
klass = Class.forName(name, false, loader);
} else {
klass = Class.forName(name, false, ClassLoader.getSystemClassLoader());
}
return klass;
}
/**
* Loads a class from the context class loader or, if that fails, from the default class loader.
*
* @param name is the name of the class to load.
* @return a <code>Class</code> object.
* @throws ClassNotFoundException if the class was not found.
*/
public static Class forName(final String name) throws ClassNotFoundException {
Class cls = null;
try {
cls = Class.forName(name, false, Thread.currentThread().getContextClassLoader());
} catch (Exception e) {
cls = Class.forName(name);
}
return cls;
}
/**
* Loads a resource from the context class loader or, if that fails, from the default class loader.
*
* @param name is the name of the resource to load.
* @return a <code>URL</code> object.
*/
public static URL loadResource(final String name) {
try {
return Thread.currentThread().getContextClassLoader().getResource(name);
} catch (Exception e) {
return ClassLoader.class.getClassLoader().getResource(name);
}
}
// /**
// * Loads a resource from the context class loader or, if that fails, from the default class loader, as stream
// *
// * @param name is the name of the resource to load.
// * @return a <code>InputStream</code> object.
// */
// public static InputStream getResourceAsStream(final String name) {
// InputStream stream = null;
// ClassLoader contextClassLoader = Thread.currentThread().getContextClassLoader();
// if (contextClassLoader != null) {
// stream = contextClassLoader.getResourceAsStream(name);
// }
// if (stream == null) {
// ClassLoader classLoader = ClassLoader.class.getClassLoader();
// if (classLoader != null) {
// stream = classLoader.getResourceAsStream(name);
// }
// }
// return stream;
// }
/**
* Returns the context class loader.
*
* @return the context class loader
*/
public static ClassLoader getLoader() {
ClassLoader loader = Thread.currentThread().getContextClassLoader();
if (loader == null) {
loader = ClassLoader.class.getClassLoader();
}
return loader;
}
}
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