325N/A * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved. 325N/A * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 325N/A * This code is free software; you can redistribute it and/or modify it 325N/A * under the terms of the GNU General Public License version 2 only, as 325N/A * published by the Free Software Foundation. Oracle designates this 325N/A * particular file as subject to the "Classpath" exception as provided 325N/A * by Oracle in the LICENSE file that accompanied this code. 325N/A * This code is distributed in the hope that it will be useful, but WITHOUT 325N/A * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 325N/A * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 325N/A * version 2 for more details (a copy is included in the LICENSE file that 325N/A * accompanied this code). 325N/A * You should have received a copy of the GNU General Public License version 325N/A * 2 along with this work; if not, write to the Free Software Foundation, 325N/A * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 325N/A * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 325N/A * or visit www.oracle.com if you need additional information or have any 325N/A * Root of the SPI implemented by the container 325N/A * (such as application server.) 325N/A * Often technologies that are built on top of JAX-WS 325N/A * (such as Tango) needs to negotiate private contracts between 325N/A * them and the container. This interface allows such technologies 325N/A * to query the negotiated SPI by using the {@link #getSPI(Class)}. 325N/A * For example, if a security pipe needs to get some information 325N/A * from a container, they can do the following: 325N/A * <li>Negotiate an interface with the container and define it. 325N/A * (let's call it <tt>ContainerSecuritySPI</tt>.) 325N/A * <li>The container will implement <tt>ContainerSecuritySPI</tt>. 325N/A * <li>At the runtime, a security pipe gets 325N/A * {@link WSEndpoint} and then to {@link Container}. 325N/A * <li>It calls <tt>container.getSPI(ContainerSecuritySPI.class)</tt> 325N/A * <li>The container returns an instance of <tt>ContainerSecuritySPI</tt>. 325N/A * <li>The security pipe talks to the container through this SPI. 325N/A * This protects JAX-WS from worrying about the details of such contracts, 325N/A * while still providing the necessary service of hooking up those parties. 325N/A * Technologies that run inside JAX-WS server runtime can access this object through 325N/A * {@link WSEndpoint#getContainer()}. In the client runtime, it can be accessed from 325N/A * {@link ContainerResolver#getContainer()} 325N/A * @author Kohsuke Kawaguchi 325N/A * Gets the specified SPI. 325N/A * This method works as a kind of directory service 325N/A * for SPIs between technologies on top of JAX-WS 325N/A * null if such an SPI is not implemented by this container. 325N/A * Constant that represents a "no {@link Container}", 325N/A * which always returns null from {@link #getSPI(Class)}.