--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/src/share/classes/sun/awt/AppContext.java Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,792 @@
+/*
+ * Copyright 1998-2007 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;
+
+import java.awt.EventQueue;
+import java.awt.Window;
+import java.awt.SystemTray;
+import java.awt.TrayIcon;
+import java.awt.Toolkit;
+import java.awt.GraphicsEnvironment;
+import java.awt.event.InvocationEvent;
+import java.security.AccessController;
+import java.security.PrivilegedAction;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.IdentityHashMap;
+import java.util.Map;
+import java.util.Set;
+import java.util.HashSet;
+import java.beans.PropertyChangeSupport;
+import java.beans.PropertyChangeListener;
+
+/**
+ * The AppContext is a table referenced by ThreadGroup which stores
+ * application service instances. (If you are not writing an application
+ * service, or don't know what one is, please do not use this class.)
+ * The AppContext allows applet access to what would otherwise be
+ * potentially dangerous services, such as the ability to peek at
+ * EventQueues or change the look-and-feel of a Swing application.<p>
+ *
+ * Most application services use a singleton object to provide their
+ * services, either as a default (such as getSystemEventQueue or
+ * getDefaultToolkit) or as static methods with class data (System).
+ * The AppContext works with the former method by extending the concept
+ * of "default" to be ThreadGroup-specific. Application services
+ * lookup their singleton in the AppContext.<p>
+ *
+ * For example, here we have a Foo service, with its pre-AppContext
+ * code:<p>
+ * <code><pre>
+ * public class Foo {
+ * private static Foo defaultFoo = new Foo();
+ *
+ * public static Foo getDefaultFoo() {
+ * return defaultFoo;
+ * }
+ *
+ * ... Foo service methods
+ * }</pre></code><p>
+ *
+ * The problem with the above is that the Foo service is global in scope,
+ * so that applets and other untrusted code can execute methods on the
+ * single, shared Foo instance. The Foo service therefore either needs
+ * to block its use by untrusted code using a SecurityManager test, or
+ * restrict its capabilities so that it doesn't matter if untrusted code
+ * executes it.<p>
+ *
+ * Here's the Foo class written to use the AppContext:<p>
+ * <code><pre>
+ * public class Foo {
+ * public static Foo getDefaultFoo() {
+ * Foo foo = (Foo)AppContext.getAppContext().get(Foo.class);
+ * if (foo == null) {
+ * foo = new Foo();
+ * getAppContext().put(Foo.class, foo);
+ * }
+ * return foo;
+ * }
+ *
+ * ... Foo service methods
+ * }</pre></code><p>
+ *
+ * Since a separate AppContext can exist for each ThreadGroup, trusted
+ * and untrusted code have access to different Foo instances. This allows
+ * untrusted code access to "system-wide" services -- the service remains
+ * within the AppContext "sandbox". For example, say a malicious applet
+ * wants to peek all of the key events on the EventQueue to listen for
+ * passwords; if separate EventQueues are used for each ThreadGroup
+ * using AppContexts, the only key events that applet will be able to
+ * listen to are its own. A more reasonable applet request would be to
+ * change the Swing default look-and-feel; with that default stored in
+ * an AppContext, the applet's look-and-feel will change without
+ * disrupting other applets or potentially the browser itself.<p>
+ *
+ * Because the AppContext is a facility for safely extending application
+ * service support to applets, none of its methods may be blocked by a
+ * a SecurityManager check in a valid Java implementation. Applets may
+ * therefore safely invoke any of its methods without worry of being
+ * blocked.
+ *
+ * Note: If a SecurityManager is installed which derives from
+ * sun.awt.AWTSecurityManager, it may override the
+ * AWTSecurityManager.getAppContext() method to return the proper
+ * AppContext based on the execution context, in the case where
+ * the default ThreadGroup-based AppContext indexing would return
+ * the main "system" AppContext. For example, in an applet situation,
+ * if a system thread calls into an applet, rather than returning the
+ * main "system" AppContext (the one corresponding to the system thread),
+ * an installed AWTSecurityManager may return the applet's AppContext
+ * based on the execution context.
+ *
+ * @author Thomas Ball
+ * @author Fred Ecks
+ */
+public final class AppContext {
+
+ /* Since the contents of an AppContext are unique to each Java
+ * session, this class should never be serialized. */
+
+ /* The key to put()/get() the Java EventQueue into/from the AppContext.
+ */
+ public static final Object EVENT_QUEUE_KEY = new StringBuffer("EventQueue");
+
+ /* A map of AppContexts, referenced by ThreadGroup.
+ */
+ private static final Map<ThreadGroup, AppContext> threadGroup2appContext =
+ Collections.synchronizedMap(new IdentityHashMap<ThreadGroup, AppContext>());
+
+ /**
+ * Returns a set containing all <code>AppContext</code>s.
+ */
+ public static Set<AppContext> getAppContexts() {
+ return new HashSet<AppContext>(threadGroup2appContext.values());
+ }
+
+ /* The main "system" AppContext, used by everything not otherwise
+ contained in another AppContext.
+ */
+ private static AppContext mainAppContext = null;
+
+ /*
+ * The hash map associated with this AppContext. A private delegate
+ * is used instead of subclassing HashMap so as to avoid all of
+ * HashMap's potentially risky methods, such as clear(), elements(),
+ * putAll(), etc.
+ */
+ private final HashMap table = new HashMap();
+
+ private final ThreadGroup threadGroup;
+
+ /**
+ * If any <code>PropertyChangeListeners</code> have been registered,
+ * the <code>changeSupport</code> field describes them.
+ *
+ * @see #addPropertyChangeListener
+ * @see #removePropertyChangeListener
+ * @see #firePropertyChange
+ */
+ private PropertyChangeSupport changeSupport = null;
+
+ public static final String DISPOSED_PROPERTY_NAME = "disposed";
+ public static final String GUI_DISPOSED = "guidisposed";
+
+ private boolean isDisposed = false; // true if AppContext is disposed
+
+ public boolean isDisposed() {
+ return isDisposed;
+ }
+
+
+ static {
+ // On the main Thread, we get the ThreadGroup, make a corresponding
+ // AppContext, and instantiate the Java EventQueue. This way, legacy
+ // code is unaffected by the move to multiple AppContext ability.
+ AccessController.doPrivileged(new PrivilegedAction() {
+ public Object run() {
+ ThreadGroup currentThreadGroup =
+ Thread.currentThread().getThreadGroup();
+ ThreadGroup parentThreadGroup = currentThreadGroup.getParent();
+ while (parentThreadGroup != null) {
+ // Find the root ThreadGroup to construct our main AppContext
+ currentThreadGroup = parentThreadGroup;
+ parentThreadGroup = currentThreadGroup.getParent();
+ }
+ mainAppContext = new AppContext(currentThreadGroup);
+ numAppContexts = 1;
+ return mainAppContext;
+ }
+ });
+ }
+
+ /*
+ * The total number of AppContexts, system-wide. This number is
+ * incremented at the beginning of the constructor, and decremented
+ * at the end of dispose(). getAppContext() checks to see if this
+ * number is 1. If so, it returns the sole AppContext without
+ * checking Thread.currentThread().
+ */
+ private static int numAppContexts;
+
+ /*
+ * The context ClassLoader that was used to create this AppContext.
+ */
+ private final ClassLoader contextClassLoader;
+
+ /**
+ * Constructor for AppContext. This method is <i>not</i> public,
+ * nor should it ever be used as such. The proper way to construct
+ * an AppContext is through the use of SunToolkit.createNewAppContext.
+ * A ThreadGroup is created for the new AppContext, a Thread is
+ * created within that ThreadGroup, and that Thread calls
+ * SunToolkit.createNewAppContext before calling anything else.
+ * That creates both the new AppContext and its EventQueue.
+ *
+ * @param threadGroup The ThreadGroup for the new AppContext
+ * @see sun.awt.SunToolkit
+ * @since 1.2
+ */
+ AppContext(ThreadGroup threadGroup) {
+ numAppContexts++;
+
+ this.threadGroup = threadGroup;
+ threadGroup2appContext.put(threadGroup, this);
+
+ this.contextClassLoader =
+ (ClassLoader) AccessController.doPrivileged(new PrivilegedAction() {
+ public Object run() {
+ return Thread.currentThread().getContextClassLoader();
+ }
+ });
+ }
+
+ private static MostRecentThreadAppContext mostRecentThreadAppContext = null;
+
+ /**
+ * Returns the appropriate AppContext for the caller,
+ * as determined by its ThreadGroup. If the main "system" AppContext
+ * would be returned and there's an AWTSecurityManager installed, it
+ * is called to get the proper AppContext based on the execution
+ * context.
+ *
+ * @return the AppContext for the caller.
+ * @see java.lang.ThreadGroup
+ * @since 1.2
+ */
+ public final static AppContext getAppContext() {
+ if (numAppContexts == 1) // If there's only one system-wide,
+ return mainAppContext; // return the main system AppContext.
+
+ final Thread currentThread = Thread.currentThread();
+
+ AppContext appContext = null;
+
+ // Note: this most recent Thread/AppContext caching is thread-hot.
+ // A simple test using SwingSet found that 96.8% of lookups
+ // were matched using the most recent Thread/AppContext. By
+ // instantiating a simple MostRecentThreadAppContext object on
+ // cache misses, the cache hits can be processed without
+ // synchronization.
+
+ MostRecentThreadAppContext recent = mostRecentThreadAppContext;
+ if ((recent != null) && (recent.thread == currentThread)) {
+ appContext = recent.appContext; // Cache hit
+ } else {
+ appContext = (AppContext)AccessController.doPrivileged(
+ new PrivilegedAction() {
+ public Object run() {
+ // Get the current ThreadGroup, and look for it and its
+ // parents in the hash from ThreadGroup to AppContext --
+ // it should be found, because we use createNewContext()
+ // when new AppContext objects are created.
+ ThreadGroup currentThreadGroup = currentThread.getThreadGroup();
+ ThreadGroup threadGroup = currentThreadGroup;
+ AppContext context = threadGroup2appContext.get(threadGroup);
+ while (context == null) {
+ threadGroup = threadGroup.getParent();
+ if (threadGroup == null) {
+ // If we get here, we're running under a ThreadGroup that
+ // has no AppContext associated with it. This should never
+ // happen, because createNewContext() should be used by the
+ // toolkit to create the ThreadGroup that everything runs
+ // under.
+ throw new RuntimeException("Invalid ThreadGroup");
+ }
+ context = threadGroup2appContext.get(threadGroup);
+ }
+ // In case we did anything in the above while loop, we add
+ // all the intermediate ThreadGroups to threadGroup2appContext
+ // so we won't spin again.
+ for (ThreadGroup tg = currentThreadGroup; tg != threadGroup; tg = tg.getParent()) {
+ threadGroup2appContext.put(tg, context);
+ }
+ // Now we're done, so we cache the latest key/value pair.
+ // (we do this before checking with any AWTSecurityManager, so if
+ // this Thread equates with the main AppContext in the cache, it
+ // still will)
+ mostRecentThreadAppContext =
+ new MostRecentThreadAppContext(currentThread, context);
+
+ return context;
+ }
+ });
+ }
+
+ if (appContext == mainAppContext) {
+ // Before we return the main "system" AppContext, check to
+ // see if there's an AWTSecurityManager installed. If so,
+ // allow it to choose the AppContext to return.
+ SecurityManager securityManager = System.getSecurityManager();
+ if ((securityManager != null) &&
+ (securityManager instanceof AWTSecurityManager)) {
+ AWTSecurityManager awtSecMgr =
+ (AWTSecurityManager)securityManager;
+ AppContext secAppContext = awtSecMgr.getAppContext();
+ if (secAppContext != null) {
+ appContext = secAppContext; // Return what we're told
+ }
+ }
+ }
+
+ return appContext;
+ }
+
+ private long DISPOSAL_TIMEOUT = 5000; // Default to 5-second timeout
+ // for disposal of all Frames
+ // (we wait for this time twice,
+ // once for dispose(), and once
+ // to clear the EventQueue).
+
+ private long THREAD_INTERRUPT_TIMEOUT = 1000;
+ // Default to 1-second timeout for all
+ // interrupted Threads to exit, and another
+ // 1 second for all stopped Threads to die.
+
+ /**
+ * Disposes of this AppContext, all of its top-level Frames, and
+ * all Threads and ThreadGroups contained within it.
+ *
+ * This method must be called from a Thread which is not contained
+ * within this AppContext.
+ *
+ * @exception IllegalThreadStateException if the current thread is
+ * contained within this AppContext
+ * @since 1.2
+ */
+ public void dispose() throws IllegalThreadStateException {
+ // Check to be sure that the current Thread isn't in this AppContext
+ if (this.threadGroup.parentOf(Thread.currentThread().getThreadGroup())) {
+ throw new IllegalThreadStateException(
+ "Current Thread is contained within AppContext to be disposed."
+ );
+ }
+
+ synchronized(this) {
+ if (this.isDisposed) {
+ return; // If already disposed, bail.
+ }
+ this.isDisposed = true;
+ }
+
+ final PropertyChangeSupport changeSupport = this.changeSupport;
+ if (changeSupport != null) {
+ changeSupport.firePropertyChange(DISPOSED_PROPERTY_NAME, false, true);
+ }
+
+ // First, we post an InvocationEvent to be run on the
+ // EventDispatchThread which disposes of all top-level Frames and TrayIcons
+
+ final Object notificationLock = new Object();
+
+ Runnable runnable = new Runnable() {
+ public void run() {
+ Window[] windowsToDispose = Window.getOwnerlessWindows();
+ for (Window w : windowsToDispose) {
+ w.dispose();
+ }
+ AccessController.doPrivileged(new PrivilegedAction() {
+ public Object run() {
+ if (!GraphicsEnvironment.isHeadless() && SystemTray.isSupported())
+ {
+ SystemTray systemTray = SystemTray.getSystemTray();
+ TrayIcon[] trayIconsToDispose = systemTray.getTrayIcons();
+ for (TrayIcon ti : trayIconsToDispose) {
+ systemTray.remove(ti);
+ }
+ }
+ return null;
+ }
+ });
+ // Alert PropertyChangeListeners that the GUI has been disposed.
+ if (changeSupport != null) {
+ changeSupport.firePropertyChange(GUI_DISPOSED, false, true);
+ }
+ synchronized(notificationLock) {
+ notificationLock.notifyAll(); // Notify caller that we're done
+ }
+ }
+ };
+ synchronized(notificationLock) {
+ SunToolkit.postEvent(this,
+ new InvocationEvent(Toolkit.getDefaultToolkit(), runnable));
+ try {
+ notificationLock.wait(DISPOSAL_TIMEOUT);
+ } catch (InterruptedException e) { }
+ }
+
+ // Next, we post another InvocationEvent to the end of the
+ // EventQueue. When it's executed, we know we've executed all
+ // events in the queue.
+
+ runnable = new Runnable() { public void run() {
+ synchronized(notificationLock) {
+ notificationLock.notifyAll(); // Notify caller that we're done
+ }
+ } };
+ synchronized(notificationLock) {
+ SunToolkit.postEvent(this,
+ new InvocationEvent(Toolkit.getDefaultToolkit(), runnable));
+ try {
+ notificationLock.wait(DISPOSAL_TIMEOUT);
+ } catch (InterruptedException e) { }
+ }
+
+ // Next, we interrupt all Threads in the ThreadGroup
+ this.threadGroup.interrupt();
+ // Note, the EventDispatchThread we've interrupted may dump an
+ // InterruptedException to the console here. This needs to be
+ // fixed in the EventDispatchThread, not here.
+
+ // Next, we sleep 10ms at a time, waiting for all of the active
+ // Threads in the ThreadGroup to exit.
+
+ long startTime = System.currentTimeMillis();
+ long endTime = startTime + (long)THREAD_INTERRUPT_TIMEOUT;
+ while ((this.threadGroup.activeCount() > 0) &&
+ (System.currentTimeMillis() < endTime)) {
+ try {
+ Thread.sleep(10);
+ } catch (InterruptedException e) { }
+ }
+
+ // Then, we stop any remaining Threads
+ this.threadGroup.stop();
+
+ // Next, we sleep 10ms at a time, waiting for all of the active
+ // Threads in the ThreadGroup to die.
+
+ startTime = System.currentTimeMillis();
+ endTime = startTime + (long)THREAD_INTERRUPT_TIMEOUT;
+ while ((this.threadGroup.activeCount() > 0) &&
+ (System.currentTimeMillis() < endTime)) {
+ try {
+ Thread.sleep(10);
+ } catch (InterruptedException e) { }
+ }
+
+ // Next, we remove this and all subThreadGroups from threadGroup2appContext
+ int numSubGroups = this.threadGroup.activeGroupCount();
+ if (numSubGroups > 0) {
+ ThreadGroup [] subGroups = new ThreadGroup[numSubGroups];
+ numSubGroups = this.threadGroup.enumerate(subGroups);
+ for (int subGroup = 0; subGroup < numSubGroups; subGroup++) {
+ threadGroup2appContext.remove(subGroups[subGroup]);
+ }
+ }
+ threadGroup2appContext.remove(this.threadGroup);
+
+ MostRecentThreadAppContext recent = mostRecentThreadAppContext;
+ if ((recent != null) && (recent.appContext == this))
+ mostRecentThreadAppContext = null;
+ // If the "most recent" points to this, clear it for GC
+
+ // Finally, we destroy the ThreadGroup entirely.
+ try {
+ this.threadGroup.destroy();
+ } catch (IllegalThreadStateException e) {
+ // Fired if not all the Threads died, ignore it and proceed
+ }
+
+ synchronized (table) {
+ this.table.clear(); // Clear out the Hashtable to ease garbage collection
+ }
+
+ numAppContexts--;
+
+ mostRecentKeyValue = null;
+ }
+
+ static final class PostShutdownEventRunnable implements Runnable {
+ private final AppContext appContext;
+
+ public PostShutdownEventRunnable(AppContext ac) {
+ appContext = ac;
+ }
+
+ public void run() {
+ final EventQueue eq = (EventQueue)appContext.get(EVENT_QUEUE_KEY);
+ if (eq != null) {
+ eq.postEvent(AWTAutoShutdown.getShutdownEvent());
+ }
+ }
+ }
+
+ static final class CreateThreadAction implements PrivilegedAction {
+ private final AppContext appContext;
+ private final Runnable runnable;
+
+ public CreateThreadAction(AppContext ac, Runnable r) {
+ appContext = ac;
+ runnable = r;
+ }
+
+ public Object run() {
+ Thread t = new Thread(appContext.getThreadGroup(), runnable);
+ t.setContextClassLoader(appContext.getContextClassLoader());
+ t.setPriority(Thread.NORM_PRIORITY + 1);
+ t.setDaemon(true);
+ return t;
+ }
+ }
+
+ static void stopEventDispatchThreads() {
+ for (AppContext appContext: getAppContexts()) {
+ if (appContext.isDisposed()) {
+ continue;
+ }
+ Runnable r = new PostShutdownEventRunnable(appContext);
+ // For security reasons EventQueue.postEvent should only be called
+ // on a thread that belongs to the corresponding thread group.
+ if (appContext != AppContext.getAppContext()) {
+ // Create a thread that belongs to the thread group associated
+ // with the AppContext and invokes EventQueue.postEvent.
+ PrivilegedAction action = new CreateThreadAction(appContext, r);
+ Thread thread = (Thread)AccessController.doPrivileged(action);
+ thread.start();
+ } else {
+ r.run();
+ }
+ }
+ }
+
+ private MostRecentKeyValue mostRecentKeyValue = null;
+ private MostRecentKeyValue shadowMostRecentKeyValue = null;
+
+ /**
+ * Returns the value to which the specified key is mapped in this context.
+ *
+ * @param key a key in the AppContext.
+ * @return the value to which the key is mapped in this AppContext;
+ * <code>null</code> if the key is not mapped to any value.
+ * @see #put(Object, Object)
+ * @since 1.2
+ */
+ public Object get(Object key) {
+ /*
+ * The most recent reference should be updated inside a synchronized
+ * block to avoid a race when put() and get() are executed in
+ * parallel on different threads.
+ */
+ synchronized (table) {
+ // Note: this most recent key/value caching is thread-hot.
+ // A simple test using SwingSet found that 72% of lookups
+ // were matched using the most recent key/value. By instantiating
+ // a simple MostRecentKeyValue object on cache misses, the
+ // cache hits can be processed without synchronization.
+
+ MostRecentKeyValue recent = mostRecentKeyValue;
+ if ((recent != null) && (recent.key == key)) {
+ return recent.value;
+ }
+
+ Object value = table.get(key);
+ if(mostRecentKeyValue == null) {
+ mostRecentKeyValue = new MostRecentKeyValue(key, value);
+ shadowMostRecentKeyValue = new MostRecentKeyValue(key, value);
+ } else {
+ MostRecentKeyValue auxKeyValue = mostRecentKeyValue;
+ shadowMostRecentKeyValue.setPair(key, value);
+ mostRecentKeyValue = shadowMostRecentKeyValue;
+ shadowMostRecentKeyValue = auxKeyValue;
+ }
+ return value;
+ }
+ }
+
+ /**
+ * Maps the specified <code>key</code> to the specified
+ * <code>value</code> in this AppContext. Neither the key nor the
+ * value can be <code>null</code>.
+ * <p>
+ * The value can be retrieved by calling the <code>get</code> method
+ * with a key that is equal to the original key.
+ *
+ * @param key the AppContext key.
+ * @param value the value.
+ * @return the previous value of the specified key in this
+ * AppContext, or <code>null</code> if it did not have one.
+ * @exception NullPointerException if the key or value is
+ * <code>null</code>.
+ * @see #get(Object)
+ * @since 1.2
+ */
+ public Object put(Object key, Object value) {
+ synchronized (table) {
+ MostRecentKeyValue recent = mostRecentKeyValue;
+ if ((recent != null) && (recent.key == key))
+ recent.value = value;
+ return table.put(key, value);
+ }
+ }
+
+ /**
+ * Removes the key (and its corresponding value) from this
+ * AppContext. This method does nothing if the key is not in the
+ * AppContext.
+ *
+ * @param key the key that needs to be removed.
+ * @return the value to which the key had been mapped in this AppContext,
+ * or <code>null</code> if the key did not have a mapping.
+ * @since 1.2
+ */
+ public Object remove(Object key) {
+ synchronized (table) {
+ MostRecentKeyValue recent = mostRecentKeyValue;
+ if ((recent != null) && (recent.key == key))
+ recent.value = null;
+ return table.remove(key);
+ }
+ }
+
+ /**
+ * Returns the root ThreadGroup for all Threads contained within
+ * this AppContext.
+ * @since 1.2
+ */
+ public ThreadGroup getThreadGroup() {
+ return threadGroup;
+ }
+
+ /**
+ * Returns the context ClassLoader that was used to create this
+ * AppContext.
+ *
+ * @see java.lang.Thread#getContextClassLoader
+ */
+ public ClassLoader getContextClassLoader() {
+ return contextClassLoader;
+ }
+
+ /**
+ * Returns a string representation of this AppContext.
+ * @since 1.2
+ */
+ public String toString() {
+ return getClass().getName() + "[threadGroup=" + threadGroup.getName() + "]";
+ }
+
+ /**
+ * Returns an array of all the property change listeners
+ * registered on this component.
+ *
+ * @return all of this component's <code>PropertyChangeListener</code>s
+ * or an empty array if no property change
+ * listeners are currently registered
+ *
+ * @see #addPropertyChangeListener
+ * @see #removePropertyChangeListener
+ * @see #getPropertyChangeListeners(java.lang.String)
+ * @see java.beans.PropertyChangeSupport#getPropertyChangeListeners
+ * @since 1.4
+ */
+ public synchronized PropertyChangeListener[] getPropertyChangeListeners() {
+ if (changeSupport == null) {
+ return new PropertyChangeListener[0];
+ }
+ return changeSupport.getPropertyChangeListeners();
+ }
+
+ /**
+ * Adds a PropertyChangeListener to the listener list for a specific
+ * property. The specified property may be one of the following:
+ * <ul>
+ * <li>if this AppContext is disposed ("disposed")</li>
+ * </ul>
+ * <ul>
+ * <li>if this AppContext's unowned Windows have been disposed
+ * ("guidisposed"). Code to cleanup after the GUI is disposed
+ * (such as LookAndFeel.uninitialize()) should execute in response to
+ * this property being fired. Notifications for the "guidisposed"
+ * property are sent on the event dispatch thread.</li>
+ * </ul>
+ * <p>
+ * If listener is null, no exception is thrown and no action is performed.
+ *
+ * @param propertyName one of the property names listed above
+ * @param listener the PropertyChangeListener to be added
+ *
+ * @see #removePropertyChangeListener(java.lang.String, java.beans.PropertyChangeListener)
+ * @see #getPropertyChangeListeners(java.lang.String)
+ * @see #addPropertyChangeListener(java.lang.String, java.beans.PropertyChangeListener)
+ */
+ public synchronized void addPropertyChangeListener(
+ String propertyName,
+ PropertyChangeListener listener) {
+ if (listener == null) {
+ return;
+ }
+ if (changeSupport == null) {
+ changeSupport = new PropertyChangeSupport(this);
+ }
+ changeSupport.addPropertyChangeListener(propertyName, listener);
+ }
+
+ /**
+ * Removes a PropertyChangeListener from the listener list for a specific
+ * property. This method should be used to remove PropertyChangeListeners
+ * that were registered for a specific bound property.
+ * <p>
+ * If listener is null, no exception is thrown and no action is performed.
+ *
+ * @param propertyName a valid property name
+ * @param listener the PropertyChangeListener to be removed
+ *
+ * @see #addPropertyChangeListener(java.lang.String, java.beans.PropertyChangeListener)
+ * @see #getPropertyChangeListeners(java.lang.String)
+ * @see #removePropertyChangeListener(java.beans.PropertyChangeListener)
+ */
+ public synchronized void removePropertyChangeListener(
+ String propertyName,
+ PropertyChangeListener listener) {
+ if (listener == null || changeSupport == null) {
+ return;
+ }
+ changeSupport.removePropertyChangeListener(propertyName, listener);
+ }
+
+ /**
+ * Returns an array of all the listeners which have been associated
+ * with the named property.
+ *
+ * @return all of the <code>PropertyChangeListeners</code> associated with
+ * the named property or an empty array if no listeners have
+ * been added
+ *
+ * @see #addPropertyChangeListener(java.lang.String, java.beans.PropertyChangeListener)
+ * @see #removePropertyChangeListener(java.lang.String, java.beans.PropertyChangeListener)
+ * @see #getPropertyChangeListeners
+ * @since 1.4
+ */
+ public synchronized PropertyChangeListener[] getPropertyChangeListeners(
+ String propertyName) {
+ if (changeSupport == null) {
+ return new PropertyChangeListener[0];
+ }
+ return changeSupport.getPropertyChangeListeners(propertyName);
+ }
+}
+
+final class MostRecentThreadAppContext {
+ final Thread thread;
+ final AppContext appContext;
+ MostRecentThreadAppContext(Thread key, AppContext value) {
+ thread = key;
+ appContext = value;
+ }
+}
+
+final class MostRecentKeyValue {
+ Object key;
+ Object value;
+ MostRecentKeyValue(Object k, Object v) {
+ key = k;
+ value = v;
+ }
+ void setPair(Object k, Object v) {
+ key = k;
+ value = v;
+ }
+}