2 * Copyright (c) 2001-2007 Sun Microsystems, Inc. All rights reserved.
4 * The Sun Project JXTA(TM) Software License
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions are met:
9 * 1. Redistributions of source code must retain the above copyright notice,
10 * this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright notice,
13 * this list of conditions and the following disclaimer in the documentation
14 * and/or other materials provided with the distribution.
16 * 3. The end-user documentation included with the redistribution, if any, must
17 * include the following acknowledgment: "This product includes software
18 * developed by Sun Microsystems, Inc. for JXTA(TM) technology."
19 * Alternately, this acknowledgment may appear in the software itself, if
20 * and wherever such third-party acknowledgments normally appear.
22 * 4. The names "Sun", "Sun Microsystems, Inc.", "JXTA" and "Project JXTA" must
23 * not be used to endorse or promote products derived from this software
24 * without prior written permission. For written permission, please contact
25 * Project JXTA at http://www.jxta.org.
27 * 5. Products derived from this software may not be called "JXTA", nor may
28 * "JXTA" appear in their name, without prior written permission of Sun.
30 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES,
31 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
32 * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL SUN
33 * MICROSYSTEMS OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
34 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
35 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
36 * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
37 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
38 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
39 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
41 * JXTA is a registered trademark of Sun Microsystems, Inc. in the United
42 * States and other countries.
44 * Please see the license information page at :
45 * <http://www.jxta.org/project/www/license.html> for instructions on use of
46 * the license in source files.
48 * ====================================================================
50 * This software consists of voluntary contributions made by many individuals
51 * on behalf of Project JXTA. For more information on Project JXTA, please see
52 * http://www.jxta.org.
54 * This license is based on the BSD license adopted by the Apache Foundation.
57 package net.jxta.platform;
61 import java.net.URLClassLoader;
63 import net.jxta.protocol.ModuleImplAdvertisement;
67 * A ClassLoader which provides additional JXTA functionality. You can load
68 * classes by ModuleSpecID. Classes are defined with ModuleImplAdvertisements
69 * and class loading will determine suitability using the provided
70 * compatibility statements.
72 public abstract class JxtaLoader extends URLClassLoader {
75 * Construct a new loader with the specified parent loader and
77 * @param parent the parent class loader for delegation.
79 public JxtaLoader(ClassLoader parent) {
80 this(new URL[0], parent);
84 * Construct a new loader for the specified URLS with the specified parent
87 * @param urls the URLs from which to load classes and resources.
88 * @param parent the parent class loader for delegation.
90 public JxtaLoader(URL[] urls, ClassLoader parent) {
98 public void addURL(URL url) {
103 * Finds and loads the class with the specified spec ID from the URL search
104 * path. Any URLs referring to JAR files are loaded and opened as needed
105 * until the class is found.
107 * @param spec the specid of the class to load.
108 * @throws ClassNotFoundException if the class could not be found.
109 * @return the resulting class.
111 public abstract Class<? extends Module> findClass(ModuleSpecID spec) throws ClassNotFoundException;
114 * Loads the class with the specified spec ID from the URL search
117 * @param spec the specid of the class to load.
118 * @throws ClassNotFoundException if the class could not be found.
119 * @return the resulting class.
121 public abstract Class<? extends Module> loadClass(ModuleSpecID spec) throws ClassNotFoundException;
124 * Defines a new class from a Module Impl Advertisement.
126 * @param impl The moduleImplAdvertisement containing the class
128 * @return The Class object that was created from the specified class data.
130 public abstract Class<? extends Module> defineClass(ModuleImplAdvertisement impl);
133 * Finds the ModuleImplAdvertisement for the associated class in the
134 * context of this ClassLoader.
136 * @param clazz The class who's ModuleImplAdvertisement is desired.
137 * @return The matching {@code ModuleImplAdvertisement} otherwise
138 * {@code null} if there is no known association.
140 public abstract ModuleImplAdvertisement findModuleImplAdvertisement(Class<? extends Module> clazz);
143 * Finds the ModuleImplAdvertisement for the associated class in the
144 * context of this ClassLoader.
146 * @param msid The module spec id who's ModuleImplAdvertisement is desired.
147 * @return The matching {@code ModuleImplAdvertisement} otherwise
148 * {@code null} if there is no known association.
150 public abstract ModuleImplAdvertisement findModuleImplAdvertisement(ModuleSpecID msid);