1 /* 2 * Copyright (c) 1996, 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 package sun.awt.windows; 26 27 abstract class WObjectPeer { 28 29 static { 30 initIDs(); 31 } 32 33 // The Windows handle for the native widget. 34 volatile long pData; 35 // if the native peer has been destroyed 36 volatile boolean destroyed = false; 37 // The associated AWT object. 38 Object target; 39 40 private volatile boolean disposed; 41 42 // set from JNI if any errors in creating the peer occur 43 protected Error createError = null; 44 45 // used to synchronize the state of this peer 46 private final Object stateLock = new Object(); 47 48 public static WObjectPeer getPeerForTarget(Object t) { 49 WObjectPeer peer = (WObjectPeer) WToolkit.targetToPeer(t); 50 return peer; 51 } 52 53 public long getData() { 54 return pData; 55 } 56 57 public Object getTarget() { 58 return target; 59 } 60 61 public final Object getStateLock() { 62 return stateLock; 63 } 64 65 /* 66 * Subclasses should override disposeImpl() instead of dispose(). Client 67 * code should always invoke dispose(), never disposeImpl(). 68 */ 69 abstract protected void disposeImpl(); 70 public final void dispose() { 71 boolean call_disposeImpl = false; 72 73 synchronized (this) { 74 if (!disposed) { 75 disposed = call_disposeImpl = true; 76 } 77 } 78 79 if (call_disposeImpl) { 80 disposeImpl(); 81 } 82 } 83 protected final boolean isDisposed() { 84 return disposed; 85 } 86 87 /** 88 * Initialize JNI field and method IDs 89 */ 90 private static native void initIDs(); 91 }