+++ /dev/null
-/* Copyright (C) 1999, 2000, 2001, 2002 Free Software Foundation
-
-This file is part of GNU Classpath.
-
-GNU Classpath is free software; you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation; either version 2, or (at your option)
-any later version.
-
-GNU Classpath 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 for more details.
-
-You should have received a copy of the GNU General Public License
-along with GNU Classpath; see the file COPYING. If not, write to the
-Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
-02111-1307 USA.
-
-Linking this library statically or dynamically with other modules is
-making a combined work based on this library. Thus, the terms and
-conditions of the GNU General Public License cover the whole
-combination.
-
-As a special exception, the copyright holders of this library give you
-permission to link this library with independent modules to produce an
-executable, regardless of the license terms of these independent
-modules, and to copy and distribute the resulting executable under
-terms of your choice, provided that you also meet, for each linked
-independent module, the terms and conditions of the license of that
-module. An independent module is a module which is not derived from
-or based on this library. If you modify this library, you may extend
-this exception to your version of the library, but you are not
-obligated to do so. If you do not wish to do so, delete this
-exception statement from your version. */
-
-
-package java.awt;
-
-import java.awt.event.*;
-import java.util.EmptyStackException;
-import java.lang.reflect.InvocationTargetException;
-
-/* Written using on-line Java 2 Platform Standard Edition v1.3 API
- * Specification, as well as "The Java Class Libraries", 2nd edition
- * (Addison-Wesley, 1998).
- * Status: Believed complete, but untested. Check FIXME's.
- */
-
-/**
- * This class manages a queue of <code>AWTEvent</code> objects that
- * are posted to it. The AWT system uses only one event queue for all
- * events.
- *
- * @author Bryce McKinlay
- * @author Aaron M. Renn (arenn@urbanophile.com)
- */
-public class EventQueue
-{
- private static final int INITIAL_QUEUE_DEPTH = 8;
- private AWTEvent[] queue = new AWTEvent[INITIAL_QUEUE_DEPTH];
-
- private int next_in = 0; // Index where next event will be added to queue
- private int next_out = 0; // Index of next event to be removed from queue
-
- private EventQueue next;
- private EventQueue prev;
-
- private EventDispatchThread dispatchThread = new EventDispatchThread(this);
-
- /**
- * Initializes a new instance of <code>EventQueue</code>.
- */
- public EventQueue()
- {
- }
-
- /**
- * Returns the next event in the queue. This method will block until
- * an event is available or until the thread is interrupted.
- *
- * @return The next event in the queue.
- *
- * @exception InterruptedException If this thread is interrupted while
- * waiting for an event to be posted to the queue.
- */
- public synchronized AWTEvent getNextEvent()
- throws InterruptedException
- {
- if (next != null)
- return next.getNextEvent();
-
- while (next_in == next_out)
- wait();
-
- AWTEvent res = queue[next_out];
-
- if (++next_out == queue.length)
- next_out = 0;
- return res;
- }
-
- /**
- * Returns the next event in the queue without removing it from the queue.
- * This method will block until an event is available or until the thread
- * is interrupted.
- *
- * @return The next event in the queue.
- * @specnote Does not block. Returns null if there are no events on the
- * queue.
- */
- public synchronized AWTEvent peekEvent()
- {
- if (next != null)
- return next.peekEvent();
-
- if (next_in != next_out)
- return queue[next_out];
- else return null;
- }
-
- /**
- * Returns the next event in the queue that has the specified id
- * without removing it from the queue.
- * This method will block until an event is available or until the thread
- * is interrupted.
- *
- * @param id The event id to return.
- *
- * @return The next event in the queue.
- *
- * @specnote Does not block. Returns null if there are no matching events
- * on the queue.
- */
- public synchronized AWTEvent peekEvent(int id)
- {
- if (next != null)
- return next.peekEvent(id);
-
- int i = next_out;
- while (i != next_in)
- {
- AWTEvent qevt = queue[i];
- if (qevt.id == id)
- return qevt;
- }
- return null;
- }
-
- /**
- * Posts a new event to the queue.
- *
- * @param event The event to post to the queue.
- */
- public synchronized void postEvent(AWTEvent evt)
- {
- if (next != null)
- {
- next.postEvent(evt);
- return;
- }
- // FIXME: Security checks?
-
- /* Check for any events already on the queue with the same source
- and ID. */
- int i = next_out;
- while (i != next_in)
- {
- AWTEvent qevt = queue[i];
- Object src;
- if (qevt.id == evt.id
- && (src = qevt.getSource()) == evt.getSource()
- && src instanceof Component)
- {
- /* If there are, call coalesceEvents on the source component
- to see if they can be combined. */
- Component srccmp = (Component) src;
- AWTEvent coalesced_evt = srccmp.coalesceEvents(qevt, evt);
- if (coalesced_evt != null)
- {
- /* Yes. Replace the existing event with the combined event. */
- queue[i] = coalesced_evt;
- return;
- }
- break;
- }
- if (++i == queue.length)
- i = 0;
- }
-
- queue[next_in] = evt;
- if (++next_in == queue.length)
- next_in = 0;
-
- if (next_in == next_out)
- {
- /* Queue is full. Extend it. */
- AWTEvent[] oldQueue = queue;
- queue = new AWTEvent[queue.length * 2];
-
- int len = oldQueue.length - next_out;
- System.arraycopy(oldQueue, next_out, queue, 0, len);
- if (next_out != 0)
- System.arraycopy(oldQueue, 0, queue, len, next_out);
-
- next_out = 0;
- next_in = oldQueue.length;
- }
- notify();
- }
-
- /** @since JDK1.2 */
- public static void invokeAndWait(Runnable runnable)
- throws InterruptedException, InvocationTargetException
- {
- EventQueue eq = Toolkit.getDefaultToolkit().getSystemEventQueue();
- Thread current = Thread.currentThread();
- if (current == eq.dispatchThread)
- throw new Error("Can't call invokeAndWait from event dispatch thread");
-
- InvocationEvent ie =
- new InvocationEvent(eq, runnable, current, true);
-
- synchronized (current)
- {
- eq.postEvent(ie);
- current.wait();
- }
-
- Exception exception;
-
- if ((exception = ie.getException()) != null)
- throw new InvocationTargetException(exception);
- }
-
- /** @since JDK1.2 */
- public static void invokeLater(Runnable runnable)
- {
- EventQueue eq = Toolkit.getDefaultToolkit().getSystemEventQueue();
-
- InvocationEvent ie =
- new InvocationEvent(eq, runnable, null, false);
-
- eq.postEvent(ie);
- }
-
- public static boolean isDispatchThread()
- {
- EventQueue eq = Toolkit.getDefaultToolkit().getSystemEventQueue();
- return (Thread.currentThread() == eq.dispatchThread);
- }
-
- /** Allows a custom EventQueue implementation to replace this one.
- * All pending events are transferred to the new queue. Calls to postEvent,
- * getNextEvent, and peekEvent are forwarded to the pushed queue until it
- * is removed with a pop().
- */
- public synchronized void push(EventQueue newEventQueue)
- {
- int i = next_out;
- while (i != next_in)
- {
- newEventQueue.postEvent(queue[i]);
- next_out = i;
- if (++i == queue.length)
- i = 0;
- }
-
- next = newEventQueue;
- newEventQueue.prev = this;
- }
-
- /** Transfer any pending events from this queue back to the parent queue that
- * was previously push()ed. Event dispatch from this queue is suspended. */
- protected void pop() throws EmptyStackException
- {
- if (prev == null)
- throw new EmptyStackException();
-
- // Don't synchronize both this and prev at the same time, or deadlock could
- // occur.
- synchronized (prev)
- {
- prev.next = null;
- }
-
- synchronized (this)
- {
- int i = next_out;
- while (i != next_in)
- {
- prev.postEvent(queue[i]);
- next_out = i;
- if (++i == queue.length)
- i = 0;
- }
- }
- }
-
- protected void dispatchEvent(AWTEvent evt)
- {
- if (evt instanceof ActiveEvent)
- {
- ActiveEvent active_evt = (ActiveEvent) evt;
- active_evt.dispatch();
- }
- else
- {
- Object source = evt.getSource();
-
- if (source instanceof Component)
- {
- Component srccmp = (Component) source;
- srccmp.dispatchEvent(evt);
- }
- else if (source instanceof MenuComponent)
- {
- MenuComponent srccmp = (MenuComponent) source;
- srccmp.dispatchEvent(evt);
- }
- }
- }
-}
projects / msp430-gcc.git / blobdiff