869 lines
34 KiB
Java
869 lines
34 KiB
Java
/*
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* Copyright (c) 1998, 2013, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package sun.awt;
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import java.awt.EventQueue;
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import java.awt.Window;
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import java.awt.SystemTray;
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import java.awt.TrayIcon;
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import java.awt.Toolkit;
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import java.awt.GraphicsEnvironment;
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import java.awt.event.InvocationEvent;
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import java.security.AccessController;
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import java.security.PrivilegedAction;
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import java.util.Collections;
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import java.util.HashMap;
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import java.util.IdentityHashMap;
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import java.util.Map;
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import java.util.Set;
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import java.util.HashSet;
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import java.beans.PropertyChangeSupport;
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import java.beans.PropertyChangeListener;
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import sun.util.logging.PlatformLogger;
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import java.util.concurrent.locks.Condition;
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import java.util.concurrent.locks.Lock;
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import java.util.concurrent.locks.ReentrantLock;
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import java.util.concurrent.atomic.AtomicInteger;
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/**
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* The AppContext is a table referenced by ThreadGroup which stores
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* application service instances. (If you are not writing an application
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* service, or don't know what one is, please do not use this class.)
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* The AppContext allows applet access to what would otherwise be
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* potentially dangerous services, such as the ability to peek at
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* EventQueues or change the look-and-feel of a Swing application.<p>
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*
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* Most application services use a singleton object to provide their
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* services, either as a default (such as getSystemEventQueue or
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* getDefaultToolkit) or as static methods with class data (System).
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* The AppContext works with the former method by extending the concept
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* of "default" to be ThreadGroup-specific. Application services
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* lookup their singleton in the AppContext.<p>
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*
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* For example, here we have a Foo service, with its pre-AppContext
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* code:<p>
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* <code><pre>
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* public class Foo {
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* private static Foo defaultFoo = new Foo();
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*
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* public static Foo getDefaultFoo() {
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* return defaultFoo;
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* }
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*
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* ... Foo service methods
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* }</pre></code><p>
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*
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* The problem with the above is that the Foo service is global in scope,
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* so that applets and other untrusted code can execute methods on the
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* single, shared Foo instance. The Foo service therefore either needs
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* to block its use by untrusted code using a SecurityManager test, or
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* restrict its capabilities so that it doesn't matter if untrusted code
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* executes it.<p>
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*
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* Here's the Foo class written to use the AppContext:<p>
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* <code><pre>
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* public class Foo {
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* public static Foo getDefaultFoo() {
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* Foo foo = (Foo)AppContext.getAppContext().get(Foo.class);
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* if (foo == null) {
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* foo = new Foo();
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* getAppContext().put(Foo.class, foo);
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* }
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* return foo;
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* }
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*
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* ... Foo service methods
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* }</pre></code><p>
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*
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* Since a separate AppContext can exist for each ThreadGroup, trusted
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* and untrusted code have access to different Foo instances. This allows
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* untrusted code access to "system-wide" services -- the service remains
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* within the AppContext "sandbox". For example, say a malicious applet
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* wants to peek all of the key events on the EventQueue to listen for
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* passwords; if separate EventQueues are used for each ThreadGroup
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* using AppContexts, the only key events that applet will be able to
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* listen to are its own. A more reasonable applet request would be to
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* change the Swing default look-and-feel; with that default stored in
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* an AppContext, the applet's look-and-feel will change without
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* disrupting other applets or potentially the browser itself.<p>
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*
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* Because the AppContext is a facility for safely extending application
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* service support to applets, none of its methods may be blocked by a
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* a SecurityManager check in a valid Java implementation. Applets may
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* therefore safely invoke any of its methods without worry of being
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* blocked.
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*
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* Note: If a SecurityManager is installed which derives from
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* sun.awt.AWTSecurityManager, it may override the
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* AWTSecurityManager.getAppContext() method to return the proper
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* AppContext based on the execution context, in the case where
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* the default ThreadGroup-based AppContext indexing would return
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* the main "system" AppContext. For example, in an applet situation,
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* if a system thread calls into an applet, rather than returning the
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* main "system" AppContext (the one corresponding to the system thread),
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* an installed AWTSecurityManager may return the applet's AppContext
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* based on the execution context.
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*
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* @author Thomas Ball
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* @author Fred Ecks
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*/
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public final class AppContext {
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private static final PlatformLogger log = PlatformLogger.getLogger("sun.awt.AppContext");
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/* Since the contents of an AppContext are unique to each Java
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* session, this class should never be serialized. */
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/*
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* The key to put()/get() the Java EventQueue into/from the AppContext.
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*/
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public static final Object EVENT_QUEUE_KEY = new StringBuffer("EventQueue");
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/*
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* The keys to store EventQueue push/pop lock and condition.
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*/
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public final static Object EVENT_QUEUE_LOCK_KEY = new StringBuilder("EventQueue.Lock");
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public final static Object EVENT_QUEUE_COND_KEY = new StringBuilder("EventQueue.Condition");
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/* A map of AppContexts, referenced by ThreadGroup.
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*/
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private static final Map<ThreadGroup, AppContext> threadGroup2appContext =
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Collections.synchronizedMap(new IdentityHashMap<ThreadGroup, AppContext>());
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/**
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* Returns a set containing all <code>AppContext</code>s.
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*/
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public static Set<AppContext> getAppContexts() {
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synchronized (threadGroup2appContext) {
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return new HashSet<AppContext>(threadGroup2appContext.values());
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}
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}
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/* The main "system" AppContext, used by everything not otherwise
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contained in another AppContext. It is implicitly created for
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standalone apps only (i.e. not applets)
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*/
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private static volatile AppContext mainAppContext = null;
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/*
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* The hash map associated with this AppContext. A private delegate
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* is used instead of subclassing HashMap so as to avoid all of
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* HashMap's potentially risky methods, such as clear(), elements(),
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* putAll(), etc.
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*/
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private final HashMap table = new HashMap();
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private final ThreadGroup threadGroup;
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/**
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* If any <code>PropertyChangeListeners</code> have been registered,
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* the <code>changeSupport</code> field describes them.
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*
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* @see #addPropertyChangeListener
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* @see #removePropertyChangeListener
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* @see #firePropertyChange
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*/
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private PropertyChangeSupport changeSupport = null;
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public static final String DISPOSED_PROPERTY_NAME = "disposed";
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public static final String GUI_DISPOSED = "guidisposed";
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private enum State {
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VALID,
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BEING_DISPOSED,
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DISPOSED
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};
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private volatile State state = State.VALID;
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public boolean isDisposed() {
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return state == State.DISPOSED;
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}
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/*
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* The total number of AppContexts, system-wide. This number is
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* incremented at the beginning of the constructor, and decremented
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* at the end of dispose(). getAppContext() checks to see if this
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* number is 1. If so, it returns the sole AppContext without
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* checking Thread.currentThread().
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*/
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private static final AtomicInteger numAppContexts = new AtomicInteger(0);
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/*
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* The context ClassLoader that was used to create this AppContext.
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*/
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private final ClassLoader contextClassLoader;
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/**
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* Constructor for AppContext. This method is <i>not</i> public,
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* nor should it ever be used as such. The proper way to construct
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* an AppContext is through the use of SunToolkit.createNewAppContext.
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* A ThreadGroup is created for the new AppContext, a Thread is
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* created within that ThreadGroup, and that Thread calls
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* SunToolkit.createNewAppContext before calling anything else.
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* That creates both the new AppContext and its EventQueue.
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*
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* @param threadGroup The ThreadGroup for the new AppContext
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* @see sun.awt.SunToolkit
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* @since 1.2
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*/
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AppContext(ThreadGroup threadGroup) {
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numAppContexts.incrementAndGet();
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this.threadGroup = threadGroup;
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threadGroup2appContext.put(threadGroup, this);
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this.contextClassLoader =
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AccessController.doPrivileged(new PrivilegedAction<ClassLoader>() {
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public ClassLoader run() {
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return Thread.currentThread().getContextClassLoader();
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}
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});
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// Initialize push/pop lock and its condition to be used by all the
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// EventQueues within this AppContext
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Lock eventQueuePushPopLock = new ReentrantLock();
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put(EVENT_QUEUE_LOCK_KEY, eventQueuePushPopLock);
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Condition eventQueuePushPopCond = eventQueuePushPopLock.newCondition();
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put(EVENT_QUEUE_COND_KEY, eventQueuePushPopCond);
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}
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private static final ThreadLocal<AppContext> threadAppContext =
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new ThreadLocal<AppContext>();
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private final static void initMainAppContext() {
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// On the main Thread, we get the ThreadGroup, make a corresponding
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// AppContext, and instantiate the Java EventQueue. This way, legacy
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// code is unaffected by the move to multiple AppContext ability.
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AccessController.doPrivileged(new PrivilegedAction<Void>() {
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public Void run() {
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ThreadGroup currentThreadGroup =
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Thread.currentThread().getThreadGroup();
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ThreadGroup parentThreadGroup = currentThreadGroup.getParent();
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while (parentThreadGroup != null) {
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// Find the root ThreadGroup to construct our main AppContext
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currentThreadGroup = parentThreadGroup;
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parentThreadGroup = currentThreadGroup.getParent();
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}
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mainAppContext = SunToolkit.createNewAppContext(currentThreadGroup);
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return null;
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}
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});
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}
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/**
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* Returns the appropriate AppContext for the caller,
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* as determined by its ThreadGroup. If the main "system" AppContext
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* would be returned and there's an AWTSecurityManager installed, it
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* is called to get the proper AppContext based on the execution
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* context.
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*
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* @return the AppContext for the caller.
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* @see java.lang.ThreadGroup
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* @since 1.2
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*/
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public final static AppContext getAppContext() {
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// we are standalone app, return the main app context
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if (numAppContexts.get() == 1 && mainAppContext != null) {
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return mainAppContext;
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}
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AppContext appContext = threadAppContext.get();
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if (null == appContext) {
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appContext = AccessController.doPrivileged(new PrivilegedAction<AppContext>()
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{
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public AppContext run() {
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// Get the current ThreadGroup, and look for it and its
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// parents in the hash from ThreadGroup to AppContext --
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// it should be found, because we use createNewContext()
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// when new AppContext objects are created.
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ThreadGroup currentThreadGroup = Thread.currentThread().getThreadGroup();
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ThreadGroup threadGroup = currentThreadGroup;
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// Special case: we implicitly create the main app context
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// if no contexts have been created yet. This covers standalone apps
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// and excludes applets because by the time applet starts
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// a number of contexts have already been created by the plugin.
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if (numAppContexts.get() == 0) {
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// This check is not necessary, its purpose is to help
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// Plugin devs to catch all the cases of main AC creation.
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if (System.getProperty("javaplugin.version") == null &&
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System.getProperty("javawebstart.version") == null) {
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initMainAppContext();
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}
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}
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AppContext context = threadGroup2appContext.get(threadGroup);
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while (context == null) {
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threadGroup = threadGroup.getParent();
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if (threadGroup == null) {
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return null;
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}
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context = threadGroup2appContext.get(threadGroup);
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}
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// In case we did anything in the above while loop, we add
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// all the intermediate ThreadGroups to threadGroup2appContext
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// so we won't spin again.
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for (ThreadGroup tg = currentThreadGroup; tg != threadGroup; tg = tg.getParent()) {
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threadGroup2appContext.put(tg, context);
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}
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// Now we're done, so we cache the latest key/value pair.
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threadAppContext.set(context);
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return context;
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}
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});
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}
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return appContext;
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}
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/**
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* Returns true if the specified AppContext is the main AppContext.
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*
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* @param ctx the context to compare with the main context
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* @return true if the specified AppContext is the main AppContext.
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* @since 1.8
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*/
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public final static boolean isMainContext(AppContext ctx) {
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return (ctx != null && ctx == mainAppContext);
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}
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private final static AppContext getExecutionAppContext() {
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SecurityManager securityManager = System.getSecurityManager();
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if ((securityManager != null) &&
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(securityManager instanceof AWTSecurityManager))
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{
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AWTSecurityManager awtSecMgr = (AWTSecurityManager) securityManager;
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AppContext secAppContext = awtSecMgr.getAppContext();
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return secAppContext; // Return what we're told
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}
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return null;
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}
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private long DISPOSAL_TIMEOUT = 5000; // Default to 5-second timeout
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// for disposal of all Frames
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// (we wait for this time twice,
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// once for dispose(), and once
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// to clear the EventQueue).
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private long THREAD_INTERRUPT_TIMEOUT = 1000;
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// Default to 1-second timeout for all
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// interrupted Threads to exit, and another
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// 1 second for all stopped Threads to die.
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/**
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* Disposes of this AppContext, all of its top-level Frames, and
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* all Threads and ThreadGroups contained within it.
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*
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* This method must be called from a Thread which is not contained
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* within this AppContext.
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*
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* @exception IllegalThreadStateException if the current thread is
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* contained within this AppContext
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* @since 1.2
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*/
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public void dispose() throws IllegalThreadStateException {
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// Check to be sure that the current Thread isn't in this AppContext
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if (this.threadGroup.parentOf(Thread.currentThread().getThreadGroup())) {
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throw new IllegalThreadStateException(
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"Current Thread is contained within AppContext to be disposed."
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);
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}
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synchronized(this) {
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if (this.state != State.VALID) {
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return; // If already disposed or being disposed, bail.
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}
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this.state = State.BEING_DISPOSED;
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}
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final PropertyChangeSupport changeSupport = this.changeSupport;
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if (changeSupport != null) {
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changeSupport.firePropertyChange(DISPOSED_PROPERTY_NAME, false, true);
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}
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// First, we post an InvocationEvent to be run on the
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// EventDispatchThread which disposes of all top-level Frames and TrayIcons
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final Object notificationLock = new Object();
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Runnable runnable = new Runnable() {
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public void run() {
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Window[] windowsToDispose = Window.getOwnerlessWindows();
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for (Window w : windowsToDispose) {
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try {
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w.dispose();
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} catch (Throwable t) {
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log.finer("exception occured while disposing app context", t);
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}
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}
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AccessController.doPrivileged(new PrivilegedAction() {
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public Object run() {
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if (!GraphicsEnvironment.isHeadless() && SystemTray.isSupported())
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{
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SystemTray systemTray = SystemTray.getSystemTray();
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TrayIcon[] trayIconsToDispose = systemTray.getTrayIcons();
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for (TrayIcon ti : trayIconsToDispose) {
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systemTray.remove(ti);
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}
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}
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return null;
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}
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});
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// Alert PropertyChangeListeners that the GUI has been disposed.
|
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if (changeSupport != null) {
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changeSupport.firePropertyChange(GUI_DISPOSED, false, true);
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}
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synchronized(notificationLock) {
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notificationLock.notifyAll(); // Notify caller that we're done
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}
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}
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};
|
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synchronized(notificationLock) {
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SunToolkit.postEvent(this,
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new InvocationEvent(Toolkit.getDefaultToolkit(), runnable));
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try {
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notificationLock.wait(DISPOSAL_TIMEOUT);
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} catch (InterruptedException e) { }
|
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}
|
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// Next, we post another InvocationEvent to the end of the
|
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// EventQueue. When it's executed, we know we've executed all
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// events in the queue.
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runnable = new Runnable() { public void run() {
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synchronized(notificationLock) {
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notificationLock.notifyAll(); // Notify caller that we're done
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}
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} };
|
|
synchronized(notificationLock) {
|
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SunToolkit.postEvent(this,
|
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new InvocationEvent(Toolkit.getDefaultToolkit(), runnable));
|
|
try {
|
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notificationLock.wait(DISPOSAL_TIMEOUT);
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} catch (InterruptedException e) { }
|
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}
|
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|
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// We are done with posting events, so change the state to disposed
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synchronized(this) {
|
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this.state = State.DISPOSED;
|
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}
|
|
|
|
// 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.
|
|
|
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long startTime = System.currentTimeMillis();
|
|
long endTime = startTime + THREAD_INTERRUPT_TIMEOUT;
|
|
while ((this.threadGroup.activeCount() > 0) &&
|
|
(System.currentTimeMillis() < endTime)) {
|
|
try {
|
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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.
|
|
|
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startTime = System.currentTimeMillis();
|
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endTime = startTime + 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);
|
|
|
|
threadAppContext.set(null);
|
|
|
|
// 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.decrementAndGet();
|
|
|
|
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
|
|
*/
|
|
@Override
|
|
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);
|
|
}
|
|
|
|
// Set up JavaAWTAccess in SharedSecrets
|
|
static {
|
|
sun.misc.SharedSecrets.setJavaAWTAccess(new sun.misc.JavaAWTAccess() {
|
|
public Object get(Object key) {
|
|
AppContext ac = getAppContext();
|
|
return (ac == null) ? null : ac.get(key);
|
|
}
|
|
public void put(Object key, Object value) {
|
|
AppContext ac = getAppContext();
|
|
if (ac != null) {
|
|
ac.put(key, value);
|
|
}
|
|
}
|
|
public void remove(Object key) {
|
|
AppContext ac = getAppContext();
|
|
if (ac != null) {
|
|
ac.remove(key);
|
|
}
|
|
}
|
|
public boolean isDisposed() {
|
|
AppContext ac = getAppContext();
|
|
return (ac == null) ? true : ac.isDisposed();
|
|
}
|
|
public boolean isMainAppContext() {
|
|
return (numAppContexts.get() == 1 && mainAppContext != null);
|
|
}
|
|
public Object getContext() {
|
|
return getAppContext();
|
|
}
|
|
public Object getExecutionContext() {
|
|
return getExecutionAppContext();
|
|
}
|
|
public Object get(Object context, Object key) {
|
|
return ((AppContext)context).get(key);
|
|
}
|
|
public void put(Object context, Object key, Object value) {
|
|
((AppContext)context).put(key, value);
|
|
}
|
|
public void remove(Object context, Object key) {
|
|
((AppContext)context).remove(key);
|
|
}
|
|
});
|
|
}
|
|
}
|
|
|
|
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;
|
|
}
|
|
}
|