/* * Copyright (c) 2008, 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 sun.awt; import java.awt.AWTEvent;import java.awt.EventQueue;  public class EventQueueDelegate {    private static final Object EVENT_QUEUE_DELEGATE_KEY =        new StringBuilder("EventQueueDelegate.Delegate");     public static void setDelegate(Delegate delegate) {        AppContext.getAppContext().put(EVENT_QUEUE_DELEGATE_KEY, delegate);    }    public static Delegate getDelegate() {        return          (Delegate) AppContext.getAppContext().get(EVENT_QUEUE_DELEGATE_KEY);    }    public interface Delegate {        /**         * This method allows for changing {@code EventQueue} events order.         *         * @param eventQueue current {@code EventQueue}         * @return next {@code event} for the {@code EventDispatchThread}         */         public AWTEvent getNextEvent(EventQueue eventQueue) throws InterruptedException;         /**         * Notifies delegate before EventQueue.dispatch method.         *         * Note: this method may mutate the event         *         * @param event  to be dispatched by {@code dispatch} method         * @return handle to be passed to {@code afterDispatch} method         */        public Object beforeDispatch(AWTEvent event) throws InterruptedException;         /**         * Notifies delegate after EventQueue.dispatch method.         *         * @param event {@code event} dispatched by the {@code dispatch} method         * @param handle object which came from {@code beforeDispatch} method         */        public void afterDispatch(AWTEvent event, Object handle) throws InterruptedException;    }}