| /* |
| * Copyright (c) 1996, 2016, 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.windows; |
| |
| import java.util.Map; |
| import java.util.WeakHashMap; |
| |
| abstract class WObjectPeer { |
| |
| static { |
| initIDs(); |
| } |
| |
| // The Windows handle for the native widget. |
| volatile long pData; |
| // if the native peer has been destroyed |
| private volatile boolean destroyed; |
| // The associated AWT object. |
| volatile Object target; |
| |
| private volatile boolean disposed; |
| |
| // set from JNI if any errors in creating the peer occur |
| volatile Error createError = null; |
| |
| // used to synchronize the state of this peer |
| private final Object stateLock = new Object(); |
| |
| private volatile Map<WObjectPeer, WObjectPeer> childPeers; |
| |
| public static WObjectPeer getPeerForTarget(Object t) { |
| WObjectPeer peer = (WObjectPeer) WToolkit.targetToPeer(t); |
| return peer; |
| } |
| |
| public long getData() { |
| return pData; |
| } |
| |
| public Object getTarget() { |
| return target; |
| } |
| |
| public final Object getStateLock() { |
| return stateLock; |
| } |
| |
| /* |
| * Subclasses should override disposeImpl() instead of dispose(). Client |
| * code should always invoke dispose(), never disposeImpl(). |
| */ |
| protected abstract void disposeImpl(); |
| public final void dispose() { |
| boolean call_disposeImpl = false; |
| |
| synchronized (this) { |
| if (!disposed) { |
| disposed = call_disposeImpl = true; |
| } |
| } |
| |
| if (call_disposeImpl) { |
| if (childPeers != null) { |
| disposeChildPeers(); |
| } |
| disposeImpl(); |
| } |
| } |
| protected final boolean isDisposed() { |
| return disposed; |
| } |
| |
| /** |
| * Initialize JNI field and method IDs |
| */ |
| private static native void initIDs(); |
| |
| // if a child peer existence depends on this peer, add it to this collection |
| final void addChildPeer(WObjectPeer child) { |
| synchronized (getStateLock()) { |
| if (childPeers == null) { |
| childPeers = new WeakHashMap<>(); |
| } |
| if (isDisposed()) { |
| throw new IllegalStateException("Parent peer is disposed"); |
| } |
| childPeers.put(child, this); |
| } |
| } |
| |
| // called to dispose dependent child peers |
| private void disposeChildPeers() { |
| synchronized (getStateLock()) { |
| for (WObjectPeer child : childPeers.keySet()) { |
| if (child != null) { |
| try { |
| child.dispose(); |
| } |
| catch (Exception e) { |
| // ignored |
| } |
| } |
| } |
| } |
| } |
| } |