/* * Copyright (c) 1998, 2004, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation.  Oracle designates this * particular file as subject to the "Classpath" exception as provided * by Oracle in the LICENSE file that accompanied this code. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package java.beans.beancontext; import java.util.Iterator; import java.util.TooManyListenersException; import java.beans.beancontext.BeanContext; import java.beans.beancontext.BeanContextServiceProvider; import java.beans.beancontext.BeanContextServicesListener;  /** * <p> * The BeanContextServices interface provides a mechanism for a BeanContext * to expose generic "services" to the BeanContextChild objects within. * </p> */public interface BeanContextServices extends BeanContext, BeanContextServicesListener {     /**     * Adds a service to this BeanContext.     * <code>BeanContextServiceProvider</code>s call this method     * to register a particular service with this context.     * If the service has not previously been added, the     * <code>BeanContextServices</code> associates     * the service with the <code>BeanContextServiceProvider</code> and     * fires a <code>BeanContextServiceAvailableEvent</code> to all     * currently registered <code>BeanContextServicesListeners</code>.     * The method then returns <code>true</code>, indicating that     * the addition of the service was successful.     * If the given service has already been added, this method     * simply returns <code>false</code>.     * @param serviceClass     the service to add     * @param serviceProvider  the <code>BeanContextServiceProvider</code>     * associated with the service     */    boolean addService(Class serviceClass, BeanContextServiceProvider serviceProvider);     /**     * BeanContextServiceProviders wishing to remove     * a currently registered service from this context     * may do so via invocation of this method. Upon revocation of     * the service, the <code>BeanContextServices</code> fires a     * <code>BeanContextServiceRevokedEvent</code> to its     * list of currently registered     * <code>BeanContextServiceRevokedListeners</code> and     * <code>BeanContextServicesListeners</code>.     * @param serviceClass the service to revoke from this BeanContextServices     * @param serviceProvider the BeanContextServiceProvider associated with     * this particular service that is being revoked     * @param revokeCurrentServicesNow a value of <code>true</code>     * indicates an exceptional circumstance where the     * <code>BeanContextServiceProvider</code> or     * <code>BeanContextServices</code> wishes to immediately     * terminate service to all currently outstanding references     * to the specified service.     */    void revokeService(Class serviceClass, BeanContextServiceProvider serviceProvider, boolean revokeCurrentServicesNow);     /**     * Reports whether or not a given service is     * currently available from this context.     * @param serviceClass the service in question     * @return true if the service is available     */    boolean hasService(Class serviceClass);     /**     * A <code>BeanContextChild</code>, or any arbitrary object     * associated with a <code>BeanContextChild</code>, may obtain     * a reference to a currently registered service from its     * nesting <code>BeanContextServices</code>     * via invocation of this method. When invoked, this method     * gets the service by calling the getService() method on the     * underlying <code>BeanContextServiceProvider</code>.     * @param child the <code>BeanContextChild</code>     * associated with this request     * @param requestor the object requesting the service     * @param serviceClass class of the requested service     * @param serviceSelector the service dependent parameter     * @param bcsrl the     * <code>BeanContextServiceRevokedListener</code> to notify     * if the service should later become revoked     * @throws TooManyListenersException     * @return a reference to this context's named     * Service as requested or <code>null</code>     */    Object getService(BeanContextChild child, Object requestor, Class serviceClass, Object serviceSelector, BeanContextServiceRevokedListener bcsrl) throws TooManyListenersException;     /**     * Releases a <code>BeanContextChild</code>'s     * (or any arbitrary object associated with a BeanContextChild)     * reference to the specified service by calling releaseService()     * on the underlying <code>BeanContextServiceProvider</code>.     * @param child the <code>BeanContextChild</code>     * @param requestor the requestor     * @param service the service     */    void releaseService(BeanContextChild child, Object requestor, Object service);     /**     * Gets the currently available services for this context.     * @return an <code>Iterator</code> consisting of the     * currently available services     */    Iterator getCurrentServiceClasses();     /**     * Gets the list of service dependent service parameters     * (Service Selectors) for the specified service, by     * calling getCurrentServiceSelectors() on the     * underlying BeanContextServiceProvider.     * @param serviceClass the specified service     * @return the currently available service selectors     * for the named serviceClass     */    Iterator getCurrentServiceSelectors(Class serviceClass);     /**     * Adds a <code>BeanContextServicesListener</code> to this BeanContext     * @param bcsl the <code>BeanContextServicesListener</code> to add     */    void addBeanContextServicesListener(BeanContextServicesListener bcsl);     /**     * Removes a <code>BeanContextServicesListener</code>     * from this <code>BeanContext</code>     * @param bcsl the <code>BeanContextServicesListener</code>     * to remove from this context     */    void removeBeanContextServicesListener(BeanContextServicesListener bcsl);}