/* * ModuleLoader - A generic, policy-driven class loader. * Copyright (c) 2004, Richard S. Hall * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * *   * Redistributions of source code must retain the above copyright *     notice, this list of conditions and the following disclaimer. *   * 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. *   * Neither the name of the ungoverned.org nor the names of its *     contributors may be used to endorse or promote products derived *     from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "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 THE COPYRIGHT * OWNER OR 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. * * Contact: Richard S. Hall (heavy@ungoverned.org) * Contributor(s): ***/package org.ungoverned.moduleloader;import java.net.URL;/** * <p> * This interface represents the <tt>ModuleLoader</tt>'s policy for creating * <tt>URL</tt> for resource loading and security purposes. Java requires the * use of <tt>URL</tt>s for resource loading and security. For resource loading, * <tt>URL</tt>s are returned for requested resources. Subsequently, the resource * <tt>URL</tt> is used to create an input stream for reading the resources * bytes. With respect to security, <tt>URL</tt>s are used when defining a * class in order to determine where the code came from, this concept is called * a <tt>CodeSource</tt>. This approach enables Java to assign permissions to * code that originates from particular locations. * </p> * <p> * The <tt>ModuleManager</tt> requires a concrete implementation of this * interface in order to function. Whenever the <tt>ModuleManager</tt> requires * a <tt>URL</tt> for either resource loading or security, it delegates to * the policy implementation. A default implementation is provided, * called <a href="DefaultURLPolicy.html"><tt>DefaultURLPolicy</tt></a>, but * it only supports resource loading, not security. * </p> * @see org.ungoverned.moduleloader.ModuleManager * @see org.ungoverned.moduleloader.DefaultURLPolicy**/public interface URLPolicy{    /**     * <p>     * This method should return a <tt>URL</tt> that represents the     * location from which the module originated. This <tt>URL</tt>     * can be used when assigning permissions to the module, such as     * is done in the Java permissions policy file.     * </p>     * @param mgr the <tt>ModuleManager</tt> of the module.     * @param module the module for which the <tt>URL</tt> is to be created.     * @return an <tt>URL</tt> to associate with the module.    **/    public URL createCodeSourceURL(ModuleManager mgr, Module module);    /**     * <p>     * This method should return a <tt>URL</tt> that is suitable     * for accessing the bytes of the specified resource. It must be possible     * open a connection to this <tt>URL</tt>, which may require that     * the implementer of this method also introduce a custom     * <tt>java.net.URLStreamHander</tt> when creating the <tt>URL</tt>.     * </p>     * @param mgr the <tt>ModuleManager</tt> of the module.     * @param module the module for which the resource is being loaded.     * @param rsIdx the index of the <tt>ResourceSource</tt> containing the resource.     * @param name the name of the resource being loaded.     * @return an <tt>URL</tt> for retrieving the resource.    **/    public URL createResourceURL(ModuleManager mgr, Module module, int rsIdx, String name);}