| /* |
| * Copyright (c) 2007, 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.java2d.pipe.hw; |
| |
| import java.util.Collections; |
| import java.util.HashMap; |
| import java.util.Iterator; |
| import java.util.Map; |
| import java.util.Set; |
| |
| /** |
| * This class is used to notify listeners about accelerated device's |
| * events such as device reset or dispose that are about to occur. |
| */ |
| public class AccelDeviceEventNotifier { |
| |
| private static AccelDeviceEventNotifier theInstance; |
| |
| /** |
| * A device is about to be reset. The listeners have to release all |
| * resources associated with the device which are required for the device |
| * to be reset. |
| */ |
| public static final int DEVICE_RESET = 0; |
| |
| /** |
| * A device is about to be disposed. The listeners have to release all |
| * resources associated with the device. |
| */ |
| public static final int DEVICE_DISPOSED = 1; |
| |
| private final Map<AccelDeviceEventListener, Integer> listeners; |
| |
| private AccelDeviceEventNotifier() { |
| listeners = Collections.synchronizedMap( |
| new HashMap<AccelDeviceEventListener, Integer>(1)); |
| } |
| |
| /** |
| * Returns a singleton of AccelDeviceEventNotifier if it exists. If the |
| * passed boolean is false and singleton doesn't exist yet, null is |
| * returned. If the passed boolean is {@code true} and singleton doesn't |
| * exist it will be created and returned. |
| * |
| * @param create whether to create a singleton instance if doesn't yet |
| * exist |
| * @return a singleton instance or null |
| */ |
| private static synchronized |
| AccelDeviceEventNotifier getInstance(boolean create) |
| { |
| if (theInstance == null && create) { |
| theInstance = new AccelDeviceEventNotifier(); |
| } |
| return theInstance; |
| } |
| |
| /** |
| * Called to indicate that a device event had occured. |
| * If a singleton exists, the listeners (those associated with |
| * the device) will be notified. |
| * |
| * @param screen a screen number of the device which is a source of |
| * the event |
| * @param eventType a type of the event |
| * @see #DEVICE_DISPOSED |
| * @see #DEVICE_RESET |
| */ |
| public static final void eventOccured(int screen, int eventType) { |
| AccelDeviceEventNotifier notifier = getInstance(false); |
| if (notifier != null) { |
| notifier.notifyListeners(eventType, screen); |
| } |
| } |
| |
| /** |
| * Adds the listener associated with a device on particular screen. |
| * |
| * Note: the listener must be removed as otherwise it will forever |
| * be referenced by the notifier. |
| * |
| * @param l the listener |
| * @param screen the screen number indicating which device the listener is |
| * interested in. |
| */ |
| public static final void addListener(AccelDeviceEventListener l,int screen){ |
| getInstance(true).add(l, screen); |
| } |
| |
| /** |
| * Removes the listener. |
| * |
| * @param l the listener |
| */ |
| public static final void removeListener(AccelDeviceEventListener l) { |
| getInstance(true).remove(l); |
| } |
| |
| private final void add(AccelDeviceEventListener theListener, int screen) { |
| listeners.put(theListener, screen); |
| } |
| private final void remove(AccelDeviceEventListener theListener) { |
| listeners.remove(theListener); |
| } |
| |
| /** |
| * Notifies the listeners associated with the screen's device about the |
| * event. |
| * |
| * Implementation note: the current list of listeners is first duplicated |
| * which allows the listeners to remove themselves during the iteration. |
| * |
| * @param screen a screen number with which the device which is a source of |
| * the event is associated with |
| * @param eventType a type of the event |
| * @see #DEVICE_DISPOSED |
| * @see #DEVICE_RESET |
| */ |
| private final void notifyListeners(int deviceEventType, int screen) { |
| HashMap<AccelDeviceEventListener, Integer> listClone; |
| Set<AccelDeviceEventListener> cloneSet; |
| |
| synchronized(listeners) { |
| listClone = |
| new HashMap<AccelDeviceEventListener, Integer>(listeners); |
| } |
| |
| cloneSet = listClone.keySet(); |
| Iterator<AccelDeviceEventListener> itr = cloneSet.iterator(); |
| while (itr.hasNext()) { |
| AccelDeviceEventListener current = itr.next(); |
| Integer i = listClone.get(current); |
| // only notify listeners which are interested in this device |
| if (i != null && i.intValue() != screen) { |
| continue; |
| } |
| if (deviceEventType == DEVICE_RESET) { |
| current.onDeviceReset(); |
| } else if (deviceEventType == DEVICE_DISPOSED) { |
| current.onDeviceDispose(); |
| } |
| } |
| } |
| } |