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| 1 | +/* | |
| 2 | + * Copyright (c) 2007, 2008, Oracle and/or its affiliates. All rights reserved. | |
| 3 | + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
| 4 | + * | |
| 5 | + * This code is free software; you can redistribute it and/or modify it | |
| 6 | + * under the terms of the GNU General Public License version 2 only, as | |
| 7 | + * published by the Free Software Foundation. Oracle designates this | |
| 8 | + * particular file as subject to the "Classpath" exception as provided | |
| 9 | + * by Oracle in the LICENSE file that accompanied this code. | |
| 10 | + * | |
| 11 | + * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 12 | + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 13 | + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 14 | + * version 2 for more details (a copy is included in the LICENSE file that | |
| 15 | + * accompanied this code). | |
| 16 | + * | |
| 17 | + * You should have received a copy of the GNU General Public License version | |
| 18 | + * 2 along with this work; if not, write to the Free Software Foundation, | |
| 19 | + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 20 | + * | |
| 21 | + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
| 22 | + * or visit www.oracle.com if you need additional information or have any | |
| 23 | + * questions. | |
| 24 | + */ | |
| 25 | + | |
| 26 | +package sun.java2d.pipe.hw; | |
| 27 | + | |
| 28 | +import java.util.Collections; | |
| 29 | +import java.util.HashMap; | |
| 30 | +import java.util.Iterator; | |
| 31 | +import java.util.Map; | |
| 32 | +import java.util.Set; | |
| 33 | + | |
| 34 | +/** | |
| 35 | + * This class is used to notify listeners about accelerated device's | |
| 36 | + * events such as device reset or dispose that are about to occur. | |
| 37 | + */ | |
| 38 | +public class AccelDeviceEventNotifier { | |
| 39 | + | |
| 40 | + private static AccelDeviceEventNotifier theInstance; | |
| 41 | + | |
| 42 | + /** | |
| 43 | + * A device is about to be reset. The listeners have to release all | |
| 44 | + * resources associated with the device which are required for the device | |
| 45 | + * to be reset. | |
| 46 | + */ | |
| 47 | + public static final int DEVICE_RESET = 0; | |
| 48 | + | |
| 49 | + /** | |
| 50 | + * A device is about to be disposed. The listeners have to release all | |
| 51 | + * resources associated with the device. | |
| 52 | + */ | |
| 53 | + public static final int DEVICE_DISPOSED = 1; | |
| 54 | + | |
| 55 | + private final Map<AccelDeviceEventListener, Integer> listeners; | |
| 56 | + | |
| 57 | + private AccelDeviceEventNotifier() { | |
| 58 | + listeners = Collections.synchronizedMap( | |
| 59 | + new HashMap<AccelDeviceEventListener, Integer>(1)); | |
| 60 | + } | |
| 61 | + | |
| 62 | + /** | |
| 63 | + * Returns a singleton of AccelDeviceEventNotifier if it exists. If the | |
| 64 | + * passed boolean is false and singleton doesn't exist yet, null is | |
| 65 | + * returned. If the passed boolean is {@code true} and singleton doesn't | |
| 66 | + * exist it will be created and returned. | |
| 67 | + * | |
| 68 | + * @param create whether to create a singleton instance if doesn't yet | |
| 69 | + * exist | |
| 70 | + * @return a singleton instance or null | |
| 71 | + */ | |
| 72 | + private static synchronized | |
| 73 | + AccelDeviceEventNotifier getInstance(boolean create) | |
| 74 | + { | |
| 75 | + if (theInstance == null && create) { | |
| 76 | + theInstance = new AccelDeviceEventNotifier(); | |
| 77 | + } | |
| 78 | + return theInstance; | |
| 79 | + } | |
| 80 | + | |
| 81 | + /** | |
| 82 | + * Called to indicate that a device event had occured. | |
| 83 | + * If a singleton exists, the listeners (those associated with | |
| 84 | + * the device) will be notified. | |
| 85 | + * | |
| 86 | + * @param screen a screen number of the device which is a source of | |
| 87 | + * the event | |
| 88 | + * @param eventType a type of the event | |
| 89 | + * @see #DEVICE_DISPOSED | |
| 90 | + * @see #DEVICE_RESET | |
| 91 | + */ | |
| 92 | + public static final void eventOccured(int screen, int eventType) { | |
| 93 | + AccelDeviceEventNotifier notifier = getInstance(false); | |
| 94 | + if (notifier != null) { | |
| 95 | + notifier.notifyListeners(eventType, screen); | |
| 96 | + } | |
| 97 | + } | |
| 98 | + | |
| 99 | + /** | |
| 100 | + * Adds the listener associated with a device on particular screen. | |
| 101 | + * | |
| 102 | + * Note: the listener must be removed as otherwise it will forever | |
| 103 | + * be referenced by the notifier. | |
| 104 | + * | |
| 105 | + * @param l the listener | |
| 106 | + * @param screen the screen number indicating which device the listener is | |
| 107 | + * interested in. | |
| 108 | + */ | |
| 109 | + public static final void addListener(AccelDeviceEventListener l,int screen){ | |
| 110 | + getInstance(true).add(l, screen); | |
| 111 | + } | |
| 112 | + | |
| 113 | + /** | |
| 114 | + * Removes the listener. | |
| 115 | + * | |
| 116 | + * @param l the listener | |
| 117 | + */ | |
| 118 | + public static final void removeListener(AccelDeviceEventListener l) { | |
| 119 | + getInstance(true).remove(l); | |
| 120 | + } | |
| 121 | + | |
| 122 | + private final void add(AccelDeviceEventListener theListener, int screen) { | |
| 123 | + listeners.put(theListener, screen); | |
| 124 | + } | |
| 125 | + private final void remove(AccelDeviceEventListener theListener) { | |
| 126 | + listeners.remove(theListener); | |
| 127 | + } | |
| 128 | + | |
| 129 | + /** | |
| 130 | + * Notifies the listeners associated with the screen's device about the | |
| 131 | + * event. | |
| 132 | + * | |
| 133 | + * Implementation note: the current list of listeners is first duplicated | |
| 134 | + * which allows the listeners to remove themselves during the iteration. | |
| 135 | + * | |
| 136 | + * @param screen a screen number with which the device which is a source of | |
| 137 | + * the event is associated with | |
| 138 | + * @param eventType a type of the event | |
| 139 | + * @see #DEVICE_DISPOSED | |
| 140 | + * @see #DEVICE_RESET | |
| 141 | + */ | |
| 142 | + private final void notifyListeners(int deviceEventType, int screen) { | |
| 143 | + HashMap<AccelDeviceEventListener, Integer> listClone; | |
| 144 | + Set<AccelDeviceEventListener> cloneSet; | |
| 145 | + | |
| 146 | + synchronized(listeners) { | |
| 147 | + listClone = | |
| 148 | + new HashMap<AccelDeviceEventListener, Integer>(listeners); | |
| 149 | + } | |
| 150 | + | |
| 151 | + cloneSet = listClone.keySet(); | |
| 152 | + Iterator<AccelDeviceEventListener> itr = cloneSet.iterator(); | |
| 153 | + while (itr.hasNext()) { | |
| 154 | + AccelDeviceEventListener current = itr.next(); | |
| 155 | + Integer i = listClone.get(current); | |
| 156 | + // only notify listeners which are interested in this device | |
| 157 | + if (i != null && i.intValue() != screen) { | |
| 158 | + continue; | |
| 159 | + } | |
| 160 | + if (deviceEventType == DEVICE_RESET) { | |
| 161 | + current.onDeviceReset(); | |
| 162 | + } else if (deviceEventType == DEVICE_DISPOSED) { | |
| 163 | + current.onDeviceDispose(); | |
| 164 | + } | |
| 165 | + } | |
| 166 | + } | |
| 167 | +} | |