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/*
 * Copyright (c) 1997, 2019 Oracle and/or its affiliates. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Distribution License v. 1.0, which is available at
 * http://www.eclipse.org/org/documents/edl-v10.php.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */

package com.sun.xml.ws.api.server;

import java.util.Collection;
import java.util.Collections;
import java.util.Set;
import java.util.concurrent.CopyOnWriteArraySet;

import com.sun.istack.NotNull;
import com.sun.xml.ws.api.Component;
import com.sun.xml.ws.api.ComponentEx;
import com.sun.xml.ws.api.ComponentRegistry;

/**
 * Root of the SPI implemented by the container
 * (such as application server.)
 *
 * 

* Often technologies that are built on top of JAX-WS * (such as Tango) needs to negotiate private contracts between * them and the container. This interface allows such technologies * to query the negotiated SPI by using the {@link #getSPI(Class)}. * *

* For example, if a security pipe needs to get some information * from a container, they can do the following: *

    *
  1. Negotiate an interface with the container and define it. * (let's call it {@code ContainerSecuritySPI}.) *
  2. The container will implement {@code ContainerSecuritySPI}. *
  3. At the runtime, a security pipe gets * {@link WSEndpoint} and then to {@link Container}. *
  4. It calls {@code container.getSPI(ContainerSecuritySPI.class)} *
  5. The container returns an instance of {@code ContainerSecuritySPI}. *
  6. The security pipe talks to the container through this SPI. *
* *

* This protects JAX-WS from worrying about the details of such contracts, * while still providing the necessary service of hooking up those parties. * *

* Technologies that run inside JAX-WS server runtime can access this object through * {@link WSEndpoint#getContainer()}. In the client runtime, it can be accessed from * {@link ContainerResolver#getContainer()} * * @author Kohsuke Kawaguchi * @see WSEndpoint */ public abstract class Container implements ComponentRegistry, ComponentEx { private final Set components = new CopyOnWriteArraySet(); /** * For derived classes. */ protected Container() { } /** * Constant that represents a "no {@link Container}", * which always returns null from {@link #getSPI(Class)}. */ public static final Container NONE = new NoneContainer(); private static final class NoneContainer extends Container { } public S getSPI(Class spiType) { if (components == null) return null; for (Component c : components) { S s = c.getSPI(spiType); if (s != null) return s; } return null; } public Set getComponents() { return components; } public @NotNull Iterable getIterableSPI(Class spiType) { E item = getSPI(spiType); if (item != null) { Collection c = Collections.singletonList(item); return c; } return Collections.emptySet(); } }