/**************************************************************************
* Copyright (c) 2003 by Punch Telematix. All rights reserved. *
* *
* Redistribution and use in source and binary forms, with or without *
* modification, are permitted provided that the following conditions *
* are met: *
* 1. Redistributions of source code must retain the above copyright *
* notice, this list of conditions and the following disclaimer. *
* 2. Redistributions in binary form must reproduce the above copyright *
* notice, this list of conditions and the following disclaimer in the *
* documentation and/or other materials provided with the distribution. *
* 3. Neither the name of Punch Telematix nor the names of *
* other contributors may be used to endorse or promote products *
* derived from this software without specific prior written permission.*
* *
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED *
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF *
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. *
* IN NO EVENT SHALL PUNCH TELEMATIX OR OTHER CONTRIBUTORS BE LIABLE *
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR *
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF *
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR *
* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, *
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE *
* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN *
* IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. *
**************************************************************************/
package wonka.vm;
import java.net.URL;
/** The application class loader is a singleton.
** It searches for class and resource files in the class path given in
** the command that launched Wonka.
*/
public final class ExtensionClassLoader extends java.net.URLClassLoader {
/**
** The one and only instance of ExtensionClassLoader.
*/
private static ExtensionClassLoader theExtensionClassLoader;
public synchronized static ExtensionClassLoader getInstance(URL[] urls, ClassLoader parent) {
if (theExtensionClassLoader == null) {
theExtensionClassLoader = new ExtensionClassLoader(urls, parent);
}
return theExtensionClassLoader;
}
/**
** A private constructor, so that only getInstance() can create an instance.
*/
private ExtensionClassLoader (URL[] urls, ClassLoader parent) throws SecurityException {
super(urls, parent);
}
public String toString() {
return "Extension Class Loader";
}
}