--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/src/share/classes/sun/awt/dnd/SunDropTargetContextPeer.java Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,903 @@
+/*
+ * Copyright 2000-2007 Sun Microsystems, Inc. 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. Sun designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ */
+
+package sun.awt.dnd;
+
+import java.awt.Component;
+import java.awt.Point;
+
+import java.awt.datatransfer.DataFlavor;
+import java.awt.datatransfer.Transferable;
+import java.awt.datatransfer.UnsupportedFlavorException;
+
+import java.awt.dnd.DnDConstants;
+
+import java.awt.dnd.DropTarget;
+import java.awt.dnd.DropTargetContext;
+import java.awt.dnd.DropTargetListener;
+import java.awt.dnd.DropTargetEvent;
+import java.awt.dnd.DropTargetDragEvent;
+import java.awt.dnd.DropTargetDropEvent;
+import java.awt.dnd.InvalidDnDOperationException;
+
+import java.awt.dnd.peer.DropTargetContextPeer;
+
+import java.util.HashSet;
+import java.util.Map;
+import java.util.Arrays;
+
+import java.util.logging.*;
+
+import java.io.IOException;
+import java.io.InputStream;
+
+import sun.awt.AppContext;
+import sun.awt.SunToolkit;
+import sun.awt.datatransfer.DataTransferer;
+import sun.awt.datatransfer.ToolkitThreadBlockedHandler;
+
+/**
+ * <p>
+ * The SunDropTargetContextPeer class is the generic class responsible for handling
+ * the interaction between a windowing systems DnD system and Java.
+ * </p>
+ *
+ * @since JDK1.3.1
+ *
+ */
+
+public abstract class SunDropTargetContextPeer implements DropTargetContextPeer, Transferable {
+
+ /*
+ * A boolean constant that requires the peer to wait until the
+ * SunDropTargetEvent is processed and return the status back
+ * to the native code.
+ */
+ public static final boolean DISPATCH_SYNC = true;
+ private DropTarget currentDT;
+ private DropTargetContext currentDTC;
+ private long[] currentT;
+ private int currentA; // target actions
+ private int currentSA; // source actions
+ private int currentDA; // current drop action
+ private int previousDA;
+
+ private long nativeDragContext;
+
+ private Transferable local;
+
+ private boolean dragRejected = false;
+
+ protected int dropStatus = STATUS_NONE;
+ protected boolean dropComplete = false;
+
+ /*
+ * global lock
+ */
+
+ protected static final Object _globalLock = new Object();
+
+ private static final Logger dndLog = Logger.getLogger("sun.awt.dnd.SunDropTargetContextPeer");
+
+ /*
+ * a primitive mechanism for advertising intra-JVM Transferables
+ */
+
+ protected static Transferable currentJVMLocalSourceTransferable = null;
+
+ public static void setCurrentJVMLocalSourceTransferable(Transferable t) throws InvalidDnDOperationException {
+ synchronized(_globalLock) {
+ if (t != null && currentJVMLocalSourceTransferable != null) {
+ throw new InvalidDnDOperationException();
+ } else {
+ currentJVMLocalSourceTransferable = t;
+ }
+ }
+ }
+
+ /**
+ * obtain the transferable iff the operation is in the same VM
+ */
+
+ private static Transferable getJVMLocalSourceTransferable() {
+ return currentJVMLocalSourceTransferable;
+ }
+
+ /*
+ * constants used by dropAccept() or dropReject()
+ */
+
+ protected final static int STATUS_NONE = 0; // none pending
+ protected final static int STATUS_WAIT = 1; // drop pending
+ protected final static int STATUS_ACCEPT = 2;
+ protected final static int STATUS_REJECT = -1;
+
+ /**
+ * create the peer
+ */
+
+ public SunDropTargetContextPeer() {
+ super();
+ }
+
+ /**
+ * @return the DropTarget associated with this peer
+ */
+
+ public DropTarget getDropTarget() { return currentDT; }
+
+ /**
+ * @param actions set the current actions
+ */
+
+ public synchronized void setTargetActions(int actions) {
+ currentA = actions &
+ (DnDConstants.ACTION_COPY_OR_MOVE | DnDConstants.ACTION_LINK);
+ }
+
+ /**
+ * @return the current target actions
+ */
+
+ public int getTargetActions() {
+ return currentA;
+ }
+
+ /**
+ * get the Transferable associated with the drop
+ */
+
+ public Transferable getTransferable() {
+ return this;
+ }
+
+ /**
+ * @return current DataFlavors available
+ */
+ // NOTE: This method may be called by privileged threads.
+ // DO NOT INVOKE CLIENT CODE ON THIS THREAD!
+
+ public DataFlavor[] getTransferDataFlavors() {
+ final Transferable localTransferable = local;
+
+ if (localTransferable != null) {
+ return localTransferable.getTransferDataFlavors();
+ } else {
+ return DataTransferer.getInstance().getFlavorsForFormatsAsArray
+ (currentT, DataTransferer.adaptFlavorMap
+ (currentDT.getFlavorMap()));
+ }
+ }
+
+ /**
+ * @return if the flavor is supported
+ */
+
+ public boolean isDataFlavorSupported(DataFlavor df) {
+ Transferable localTransferable = local;
+
+ if (localTransferable != null) {
+ return localTransferable.isDataFlavorSupported(df);
+ } else {
+ return DataTransferer.getInstance().getFlavorsForFormats
+ (currentT, DataTransferer.adaptFlavorMap
+ (currentDT.getFlavorMap())).
+ containsKey(df);
+ }
+ }
+
+ /**
+ * @return the data
+ */
+
+ public Object getTransferData(DataFlavor df)
+ throws UnsupportedFlavorException, IOException,
+ InvalidDnDOperationException
+ {
+ Long lFormat = null;
+ Transferable localTransferable = local;
+
+ if (localTransferable != null) {
+ return localTransferable.getTransferData(df);
+ }
+
+ if (dropStatus != STATUS_ACCEPT || dropComplete) {
+ throw new InvalidDnDOperationException("No drop current");
+ }
+
+ Map flavorMap = DataTransferer.getInstance().getFlavorsForFormats
+ (currentT, DataTransferer.adaptFlavorMap
+ (currentDT.getFlavorMap()));
+
+ lFormat = (Long)flavorMap.get(df);
+ if (lFormat == null) {
+ throw new UnsupportedFlavorException(df);
+ }
+
+ if (df.isRepresentationClassRemote() &&
+ currentDA != DnDConstants.ACTION_LINK) {
+ throw new InvalidDnDOperationException("only ACTION_LINK is permissable for transfer of java.rmi.Remote objects");
+ }
+
+ final long format = lFormat.longValue();
+ Object ret = getNativeData(format);
+
+ if (ret instanceof byte[]) {
+ try {
+ return DataTransferer.getInstance().
+ translateBytes((byte[])ret, df, format, this);
+ } catch (IOException e) {
+ throw new InvalidDnDOperationException(e.getMessage());
+ }
+ } else if (ret instanceof InputStream) {
+ try {
+ return DataTransferer.getInstance().
+ translateStream((InputStream)ret, df, format, this);
+ } catch (IOException e) {
+ throw new InvalidDnDOperationException(e.getMessage());
+ }
+ } else {
+ throw new IOException("no native data was transfered");
+ }
+ }
+
+ protected abstract Object getNativeData(long format)
+ throws IOException;
+
+ /**
+ * @return if the transfer is a local one
+ */
+ public boolean isTransferableJVMLocal() {
+ return local != null || getJVMLocalSourceTransferable() != null;
+ }
+
+ private int handleEnterMessage(final Component component,
+ final int x, final int y,
+ final int dropAction,
+ final int actions, final long[] formats,
+ final long nativeCtxt) {
+ return postDropTargetEvent(component, x, y, dropAction, actions,
+ formats, nativeCtxt,
+ SunDropTargetEvent.MOUSE_ENTERED,
+ SunDropTargetContextPeer.DISPATCH_SYNC);
+ }
+
+ /**
+ * actual processing on EventQueue Thread
+ */
+
+ protected void processEnterMessage(SunDropTargetEvent event) {
+ Component c = (Component)event.getSource();
+ DropTarget dt = c.getDropTarget();
+ Point hots = event.getPoint();
+
+ local = getJVMLocalSourceTransferable();
+
+ if (currentDTC != null) { // some wreckage from last time
+ currentDTC.removeNotify();
+ currentDTC = null;
+ }
+
+ if (c.isShowing() && dt != null && dt.isActive()) {
+ currentDT = dt;
+ currentDTC = currentDT.getDropTargetContext();
+
+ currentDTC.addNotify(this);
+
+ currentA = dt.getDefaultActions();
+
+ try {
+ ((DropTargetListener)dt).dragEnter(new DropTargetDragEvent(currentDTC,
+ hots,
+ currentDA,
+ currentSA));
+ } catch (Exception e) {
+ e.printStackTrace();
+ currentDA = DnDConstants.ACTION_NONE;
+ }
+ } else {
+ currentDT = null;
+ currentDTC = null;
+ currentDA = DnDConstants.ACTION_NONE;
+ currentSA = DnDConstants.ACTION_NONE;
+ currentA = DnDConstants.ACTION_NONE;
+ }
+
+ }
+
+ /**
+ * upcall to handle exit messages
+ */
+
+ private void handleExitMessage(final Component component,
+ final long nativeCtxt) {
+ /*
+ * Even though the return value is irrelevant for this event, it is
+ * dispatched synchronously to fix 4393148 properly.
+ */
+ postDropTargetEvent(component, 0, 0, DnDConstants.ACTION_NONE,
+ DnDConstants.ACTION_NONE, null, nativeCtxt,
+ SunDropTargetEvent.MOUSE_EXITED,
+ SunDropTargetContextPeer.DISPATCH_SYNC);
+ }
+
+ /**
+ *
+ */
+
+ protected void processExitMessage(SunDropTargetEvent event) {
+ Component c = (Component)event.getSource();
+ DropTarget dt = c.getDropTarget();
+ DropTargetContext dtc = null;
+
+ if (dt == null) {
+ currentDT = null;
+ currentT = null;
+
+ if (currentDTC != null) {
+ currentDTC.removeNotify();
+ }
+
+ currentDTC = null;
+
+ return;
+ }
+
+ if (dt != currentDT) {
+
+ if (currentDTC != null) {
+ currentDTC.removeNotify();
+ }
+
+ currentDT = dt;
+ currentDTC = dt.getDropTargetContext();
+
+ currentDTC.addNotify(this);
+ }
+
+ dtc = currentDTC;
+
+ if (dt.isActive()) try {
+ ((DropTargetListener)dt).dragExit(new DropTargetEvent(dtc));
+ } catch (Exception e) {
+ e.printStackTrace();
+ } finally {
+ currentA = DnDConstants.ACTION_NONE;
+ currentSA = DnDConstants.ACTION_NONE;
+ currentDA = DnDConstants.ACTION_NONE;
+ currentDT = null;
+ currentT = null;
+
+ currentDTC.removeNotify();
+ currentDTC = null;
+
+ local = null;
+
+ dragRejected = false;
+ }
+ }
+
+ private int handleMotionMessage(final Component component,
+ final int x, final int y,
+ final int dropAction,
+ final int actions, final long[] formats,
+ final long nativeCtxt) {
+ return postDropTargetEvent(component, x, y, dropAction, actions,
+ formats, nativeCtxt,
+ SunDropTargetEvent.MOUSE_DRAGGED,
+ SunDropTargetContextPeer.DISPATCH_SYNC);
+ }
+
+ /**
+ *
+ */
+
+ protected void processMotionMessage(SunDropTargetEvent event,
+ boolean operationChanged) {
+ Component c = (Component)event.getSource();
+ Point hots = event.getPoint();
+ int id = event.getID();
+ DropTarget dt = c.getDropTarget();
+ DropTargetContext dtc = null;
+
+ if (c.isShowing() && (dt != null) && dt.isActive()) {
+ if (currentDT != dt) {
+ if (currentDTC != null) {
+ currentDTC.removeNotify();
+ }
+
+ currentDT = dt;
+ currentDTC = null;
+ }
+
+ dtc = currentDT.getDropTargetContext();
+ if (dtc != currentDTC) {
+ if (currentDTC != null) {
+ currentDTC.removeNotify();
+ }
+
+ currentDTC = dtc;
+ currentDTC.addNotify(this);
+ }
+
+ currentA = currentDT.getDefaultActions();
+
+ try {
+ DropTargetDragEvent dtde = new DropTargetDragEvent(dtc,
+ hots,
+ currentDA,
+ currentSA);
+ DropTargetListener dtl = (DropTargetListener)dt;
+ if (operationChanged) {
+ dtl.dropActionChanged(dtde);
+ } else {
+ dtl.dragOver(dtde);
+ }
+
+ if (dragRejected) {
+ currentDA = DnDConstants.ACTION_NONE;
+ }
+ } catch (Exception e) {
+ e.printStackTrace();
+ currentDA = DnDConstants.ACTION_NONE;
+ }
+ } else {
+ currentDA = DnDConstants.ACTION_NONE;
+ }
+ }
+
+ /**
+ * upcall to handle the Drop message
+ */
+
+ private void handleDropMessage(final Component component,
+ final int x, final int y,
+ final int dropAction, final int actions,
+ final long[] formats,
+ final long nativeCtxt) {
+ postDropTargetEvent(component, x, y, dropAction, actions,
+ formats, nativeCtxt,
+ SunDropTargetEvent.MOUSE_DROPPED,
+ !SunDropTargetContextPeer.DISPATCH_SYNC);
+ }
+
+ /**
+ *
+ */
+
+ protected void processDropMessage(SunDropTargetEvent event) {
+ Component c = (Component)event.getSource();
+ Point hots = event.getPoint();
+ DropTarget dt = c.getDropTarget();
+
+ dropStatus = STATUS_WAIT; // drop pending ACK
+ dropComplete = false;
+
+ if (c.isShowing() && dt != null && dt.isActive()) {
+ DropTargetContext dtc = dt.getDropTargetContext();
+
+ currentDT = dt;
+
+ if (currentDTC != null) {
+ currentDTC.removeNotify();
+ }
+
+ currentDTC = dtc;
+ currentDTC.addNotify(this);
+ currentA = dt.getDefaultActions();
+
+ synchronized(_globalLock) {
+ if ((local = getJVMLocalSourceTransferable()) != null)
+ setCurrentJVMLocalSourceTransferable(null);
+ }
+
+ try {
+ ((DropTargetListener)dt).drop(new DropTargetDropEvent(dtc,
+ hots,
+ currentDA,
+ currentSA,
+ local != null));
+ } finally {
+ if (dropStatus == STATUS_WAIT) {
+ rejectDrop();
+ } else if (dropComplete == false) {
+ dropComplete(false);
+ }
+ }
+ } else {
+ rejectDrop();
+ }
+ }
+
+ protected int postDropTargetEvent(final Component component,
+ final int x, final int y,
+ final int dropAction,
+ final int actions,
+ final long[] formats,
+ final long nativeCtxt,
+ final int eventID,
+ final boolean dispatchType) {
+ AppContext appContext = SunToolkit.targetToAppContext(component);
+
+ EventDispatcher dispatcher =
+ new EventDispatcher(this, dropAction, actions, formats, nativeCtxt,
+ dispatchType);
+
+ SunDropTargetEvent event =
+ new SunDropTargetEvent(component, eventID, x, y, dispatcher);
+
+ if (dispatchType == SunDropTargetContextPeer.DISPATCH_SYNC) {
+ DataTransferer.getInstance().getToolkitThreadBlockedHandler().lock();
+ }
+
+ // schedule callback
+ SunToolkit.postEvent(appContext, event);
+
+ eventPosted(event);
+
+ if (dispatchType == SunDropTargetContextPeer.DISPATCH_SYNC) {
+ while (!dispatcher.isDone()) {
+ DataTransferer.getInstance().getToolkitThreadBlockedHandler().enter();
+ }
+
+ DataTransferer.getInstance().getToolkitThreadBlockedHandler().unlock();
+
+ // return target's response
+ return dispatcher.getReturnValue();
+ } else {
+ return 0;
+ }
+ }
+
+ /**
+ * acceptDrag
+ */
+
+ public synchronized void acceptDrag(int dragOperation) {
+ if (currentDT == null) {
+ throw new InvalidDnDOperationException("No Drag pending");
+ }
+ currentDA = mapOperation(dragOperation);
+ if (currentDA != DnDConstants.ACTION_NONE) {
+ dragRejected = false;
+ }
+ }
+
+ /**
+ * rejectDrag
+ */
+
+ public synchronized void rejectDrag() {
+ if (currentDT == null) {
+ throw new InvalidDnDOperationException("No Drag pending");
+ }
+ currentDA = DnDConstants.ACTION_NONE;
+ dragRejected = true;
+ }
+
+ /**
+ * acceptDrop
+ */
+
+ public synchronized void acceptDrop(int dropOperation) {
+ if (dropOperation == DnDConstants.ACTION_NONE)
+ throw new IllegalArgumentException("invalid acceptDrop() action");
+
+ if (dropStatus != STATUS_WAIT) {
+ throw new InvalidDnDOperationException("invalid acceptDrop()");
+ }
+
+ currentDA = currentA = mapOperation(dropOperation & currentSA);
+
+ dropStatus = STATUS_ACCEPT;
+ dropComplete = false;
+ }
+
+ /**
+ * reject Drop
+ */
+
+ public synchronized void rejectDrop() {
+ if (dropStatus != STATUS_WAIT) {
+ throw new InvalidDnDOperationException("invalid rejectDrop()");
+ }
+ dropStatus = STATUS_REJECT;
+ /*
+ * Fix for 4285634.
+ * The target rejected the drop means that it doesn't perform any
+ * drop action. This change is to make Solaris behavior consistent
+ * with Win32.
+ */
+ currentDA = DnDConstants.ACTION_NONE;
+ dropComplete(false);
+ }
+
+ /**
+ * mapOperation
+ */
+
+ private int mapOperation(int operation) {
+ int[] operations = {
+ DnDConstants.ACTION_MOVE,
+ DnDConstants.ACTION_COPY,
+ DnDConstants.ACTION_LINK,
+ };
+ int ret = DnDConstants.ACTION_NONE;
+
+ for (int i = 0; i < operations.length; i++) {
+ if ((operation & operations[i]) == operations[i]) {
+ ret = operations[i];
+ break;
+ }
+ }
+
+ return ret;
+ }
+
+ /**
+ * signal drop complete
+ */
+
+ public synchronized void dropComplete(boolean success) {
+ if (dropStatus == STATUS_NONE) {
+ throw new InvalidDnDOperationException("No Drop pending");
+ }
+
+ if (currentDTC != null) currentDTC.removeNotify();
+
+ currentDT = null;
+ currentDTC = null;
+ currentT = null;
+ currentA = DnDConstants.ACTION_NONE;
+
+ synchronized(_globalLock) {
+ currentJVMLocalSourceTransferable = null;
+ }
+
+ dropStatus = STATUS_NONE;
+ dropComplete = true;
+
+ try {
+ doDropDone(success, currentDA, local != null);
+ } finally {
+ currentDA = DnDConstants.ACTION_NONE;
+ // The native context is invalid after the drop is done.
+ // Clear the reference to prohibit access.
+ nativeDragContext = 0;
+ }
+ }
+
+ protected abstract void doDropDone(boolean success,
+ int dropAction, boolean isLocal);
+
+ protected synchronized long getNativeDragContext() {
+ return nativeDragContext;
+ }
+
+ protected void eventPosted(SunDropTargetEvent e) {}
+
+ protected void eventProcessed(SunDropTargetEvent e, int returnValue,
+ boolean dispatcherDone) {}
+
+ protected static class EventDispatcher {
+
+ private final SunDropTargetContextPeer peer;
+
+ // context fields
+ private final int dropAction;
+ private final int actions;
+ private final long[] formats;
+ private long nativeCtxt;
+ private final boolean dispatchType;
+ private boolean dispatcherDone = false;
+
+ // dispatcher state fields
+ private int returnValue = 0;
+ // set of events to be dispatched by this dispatcher
+ private final HashSet eventSet = new HashSet(3);
+
+ static final ToolkitThreadBlockedHandler handler =
+ DataTransferer.getInstance().getToolkitThreadBlockedHandler();
+
+ EventDispatcher(SunDropTargetContextPeer peer,
+ int dropAction,
+ int actions,
+ long[] formats,
+ long nativeCtxt,
+ boolean dispatchType) {
+
+ this.peer = peer;
+ this.nativeCtxt = nativeCtxt;
+ this.dropAction = dropAction;
+ this.actions = actions;
+ this.formats =
+ (null == formats) ? null : Arrays.copyOf(formats, formats.length);
+ this.dispatchType = dispatchType;
+ }
+
+ void dispatchEvent(SunDropTargetEvent e) {
+ int id = e.getID();
+
+ switch (id) {
+ case SunDropTargetEvent.MOUSE_ENTERED:
+ dispatchEnterEvent(e);
+ break;
+ case SunDropTargetEvent.MOUSE_DRAGGED:
+ dispatchMotionEvent(e);
+ break;
+ case SunDropTargetEvent.MOUSE_EXITED:
+ dispatchExitEvent(e);
+ break;
+ case SunDropTargetEvent.MOUSE_DROPPED:
+ dispatchDropEvent(e);
+ break;
+ default:
+ throw new InvalidDnDOperationException();
+ }
+ }
+
+ private void dispatchEnterEvent(SunDropTargetEvent e) {
+ synchronized (peer) {
+
+ // store the drop action here to track operation changes
+ peer.previousDA = dropAction;
+
+ // setup peer context
+ peer.nativeDragContext = nativeCtxt;
+ peer.currentT = formats;
+ peer.currentSA = actions;
+ peer.currentDA = dropAction;
+ // To allow data retrieval.
+ peer.dropStatus = STATUS_ACCEPT;
+ peer.dropComplete = false;
+
+ try {
+ peer.processEnterMessage(e);
+ } finally {
+ peer.dropStatus = STATUS_NONE;
+ }
+
+ setReturnValue(peer.currentDA);
+ }
+ }
+
+ private void dispatchMotionEvent(SunDropTargetEvent e) {
+ synchronized (peer) {
+
+ boolean operationChanged = peer.previousDA != dropAction;
+ peer.previousDA = dropAction;
+
+ // setup peer context
+ peer.nativeDragContext = nativeCtxt;
+ peer.currentT = formats;
+ peer.currentSA = actions;
+ peer.currentDA = dropAction;
+ // To allow data retrieval.
+ peer.dropStatus = STATUS_ACCEPT;
+ peer.dropComplete = false;
+
+ try {
+ peer.processMotionMessage(e, operationChanged);
+ } finally {
+ peer.dropStatus = STATUS_NONE;
+ }
+
+ setReturnValue(peer.currentDA);
+ }
+ }
+
+ private void dispatchExitEvent(SunDropTargetEvent e) {
+ synchronized (peer) {
+
+ // setup peer context
+ peer.nativeDragContext = nativeCtxt;
+
+ peer.processExitMessage(e);
+ }
+ }
+
+ private void dispatchDropEvent(SunDropTargetEvent e) {
+ synchronized (peer) {
+
+ // setup peer context
+ peer.nativeDragContext = nativeCtxt;
+ peer.currentT = formats;
+ peer.currentSA = actions;
+ peer.currentDA = dropAction;
+
+ peer.processDropMessage(e);
+ }
+ }
+
+ void setReturnValue(int ret) {
+ returnValue = ret;
+ }
+
+ int getReturnValue() {
+ return returnValue;
+ }
+
+ boolean isDone() {
+ return eventSet.isEmpty();
+ }
+
+ void registerEvent(SunDropTargetEvent e) {
+ handler.lock();
+ if (!eventSet.add(e) && dndLog.isLoggable(Level.FINE)) {
+ dndLog.log(Level.FINE, "Event is already registered: " + e);
+ }
+ handler.unlock();
+ }
+
+ void unregisterEvent(SunDropTargetEvent e) {
+ handler.lock();
+ try {
+ if (!eventSet.remove(e)) {
+ // This event has already been unregistered.
+ return;
+ }
+ if (eventSet.isEmpty()) {
+ if (!dispatcherDone && dispatchType == DISPATCH_SYNC) {
+ handler.exit();
+ }
+ dispatcherDone = true;
+ }
+ } finally {
+ handler.unlock();
+ }
+
+ try {
+ peer.eventProcessed(e, returnValue, dispatcherDone);
+ } finally {
+ /*
+ * Clear the reference to the native context if all copies of
+ * the original event are processed.
+ */
+ if (dispatcherDone) {
+ nativeCtxt = 0;
+ // Fix for 6342381
+ peer.nativeDragContext = 0;
+
+ }
+ }
+ }
+
+ public void unregisterAllEvents() {
+ Object[] events = null;
+ handler.lock();
+ try {
+ events = eventSet.toArray();
+ } finally {
+ handler.unlock();
+ }
+
+ if (events != null) {
+ for (int i = 0; i < events.length; i++) {
+ unregisterEvent((SunDropTargetEvent)events[i]);
+ }
+ }
+ }
+ }
+}