/* * Copyright (c) 2001 Sun Microsystems, Inc.  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. The end-user documentation included with the redistribution, *    if any, must include the following acknowledgment: *       "This product includes software developed by the *       Sun Microsystems, Inc. for Project JXTA." *    Alternately, this acknowledgment may appear in the software itself, *    if and wherever such third-party acknowledgments normally appear. * * 4. The names "Sun", "Sun Microsystems, Inc.", "JXTA" and "Project JXTA" must *    not be used to endorse or promote products derived from this *    software without prior written permission. For written *    permission, please contact Project JXTA at http://www.jxta.org. * * 5. Products derived from this software may not be called "JXTA", *    nor may "JXTA" appear in their name, without prior written *    permission of Sun. * * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED 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 THE SUN MICROSYSTEMS OR * ITS 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. * ==================================================================== * * This software consists of voluntary contributions made by many * individuals on behalf of Project JXTA.  For more * information on Project JXTA, please see * <http://www.jxta.org/>. * * This license is based on the BSD license adopted by the Apache Foundation. * * $Id: JxtaLoader.java,v 1.6 2006/02/22 01:29:44 bondolo Exp $ */package net.jxta.platform;import java.net.URL;import java.net.URLClassLoader;import net.jxta.protocol.ModuleImplAdvertisement;/** * A ClassLoader which provides additional JXTA functionality. You can load * classes by ModuleSpecID. Classes are defiend with ModuleImplAdvertisements * and class loading will determine suitability using the provided * compatiblity statements. **/public abstract class JxtaLoader extends URLClassLoader {        /**     *  Constuct a new loader with the specified parent loader and     *     *  @param parent  the parent class loader for delegation.     **/    public JxtaLoader( ClassLoader parent ) {        this( new URL[0], parent );    }        /**     * Constuct a new loader for the specified URLS with the specified parent     * loader.     *     *  @param urls  the URLs from which to load classes and resources.     *  @param parent  the parent class loader for delegation.     **/    public JxtaLoader( URL[] urls, ClassLoader parent ) {        super( urls, parent );    }        /**     * Finds and loads the class with the specified spec ID from the URL search     * path. Any URLs referring to JAR files are loaded and opened as needed     * until the class is found.     *     *  @param spec the specid of the class to load.     *  @throws ClassNotFoundException if the class could not be found.     *  @return the resulting class.     **/    public abstract Class findClass( ModuleSpecID spec ) throws ClassNotFoundException;        /**     *  Loads the class with the specified spec ID from the URL search     *  path.     *     *  @param spec the specid of the class to load.     *  @throws ClassNotFoundException if the class could not be found.     *  @return the resulting class.     **/    public abstract Class loadClass( ModuleSpecID spec ) throws ClassNotFoundException;        /**     *  Defines a new class from a Module Impl Advertisement.     *     *  @param impl The moduleImplAdvertisement containing the class      *  specification     *  @return The Class object that was created from the specified class data.     **/    public abstract Class defineClass( ModuleImplAdvertisement impl );    /**     *  Finds the ModuleImplAdvertisement for the associated class in the     *  context of this ClassLoader.     *     *  @param clazz The class who's ModuleImplAdvertisement is desired.     *  @return The matching {@code ModuleImplAdvertisement} otherwise     *  {@code null} if there is no known association.     **/    public abstract ModuleImplAdvertisement findModuleImplAdvertisement( Class clazz );    /**     *  {@inheritDoc}     **/    public void addURL( URL url ) {        super.addURL(url);    }}