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+/* Timer.java --
+ Copyright (C) 2002, 2004, 2005, 2006, Free Software Foundation, Inc.
+
+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., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 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 javax.swing;
+
+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;
+import java.io.Serializable;
+import java.util.EventListener;
+
+import javax.swing.event.EventListenerList;
+
+/**
+ * Fires one or more action events after the specified delay. This is
+ * a specialised version of <code>java.util.Timer</code> just for
+ * firing <code>ActionEvent</code>s. All Timers share one (daemon)
+ * Thread (or java.util.Timer). All events are fired from the event
+ * queue.
+ *
+ * @author Ronald Veldema
+ * @author Audrius Meskauskas (audriusa@Bionformatics.org) - bug fixes
+ * and documentation comments
+ */
+public class Timer
+ implements Serializable
+{
+ /**
+ * Given to the shared java.util.Timer to (possibly repeatedly) call
+ * queueEvent().
+ */
+ private class Task extends java.util.TimerTask
+ {
+ public void run()
+ {
+ if (logTimers)
+ System.out.println("javax.swing.Timer -> queueEvent()");
+ queueEvent();
+
+ if (!repeats)
+ task = null;
+ }
+ }
+
+ /**
+ * Use serialVersionUID for interoperability.
+ */
+ private static final long serialVersionUID = -1116180831621385484L;
+
+ /**
+ * The encloding class, used with {@link SwingUtilities#invokeLater}
+ * to invoke the {@link #drainEvents()}.
+ */
+ private Runnable drainer = new Runnable()
+ {
+ public void run()
+ {
+ drainEvents();
+ }
+ };
+
+ /**
+ * The static java.util.Timer daemon which will be used to schedule
+ * all javax.swing.Timer.Task objects. The daemon will always be
+ * running, even if there's no task scheduled in it.
+ */
+ private static java.util.Timer timer = new java.util.Timer("swing.Timer",
+ true);
+
+ /**
+ * If <code>true</code>, the timer prints a message to
+ * {@link System#out} when firing each event.
+ */
+ static boolean logTimers;
+
+ /**
+ * A field to store all listeners who are listening to this timer.
+ */
+ protected EventListenerList listenerList = new EventListenerList();
+
+ /**
+ * <code>true</code> if the timer coalesces events.
+ */
+ boolean coalesce = true;
+
+ /**
+ * <code>true</code> if the timer is firing repetetive events.
+ */
+ boolean repeats = true;
+
+ /**
+ * The delay between subsequent repetetive events.
+ */
+ int delay;
+
+ /**
+ * The initial delay before the first event.
+ */
+ int initialDelay;
+
+ /**
+ * The number of events that have been already fired by this timer.
+ * This is used as a numeric identifier for the next event that would
+ * be fired.
+ */
+ int ticks;
+
+ /**
+ * The task that calls queueEvent(). When null this Timer is stopped.
+ * This is package private to avoid synthetic accessor method.
+ */
+ Task task;
+
+ /**
+ * This object manages a "queue" of virtual actionEvents, maintained as a
+ * simple long counter. When the timer expires, a new event is queued,
+ * and a dispatcher object is pushed into the system event queue. When
+ * the system thread runs the dispatcher, it will fire as many
+ * ActionEvents as have been queued, unless the timer is set to
+ * coalescing mode, in which case it will fire only one ActionEvent.
+ */
+ private long queue;
+
+ /**
+ * <code>synchronized(queueLock)</code> replaces
+ * <code>synchronized(queue)</code> that is not supported by this language.
+ */
+ private Object queueLock = new Object();
+
+ /**
+ * Creates a new Timer object.
+ *
+ * @param d the default value for both initial and between event delay, in
+ * milliseconds.
+ * @param listener the first action listener, can be <code>null</code>.
+ */
+ public Timer(int d, ActionListener listener)
+ {
+ delay = d;
+ initialDelay = d;
+
+ if (listener != null)
+ addActionListener(listener);
+ }
+
+ /**
+ * Get the array of action listeners.
+ *
+ * @return the array of action listeners that are listening for the events,
+ * fired by this timer
+ *
+ * @since 1.4
+ */
+ public ActionListener[] getActionListeners()
+ {
+ return (ActionListener[]) listenerList.getListeners(ActionListener.class);
+ }
+
+ /**
+ * Sets whether the Timer coalesces multiple pending event firings.
+ * If the coalescing is enabled, the multiple events that have not been
+ * fired on time are replaced by the single event. The events may not
+ * be fired on time if the application is busy.
+ *
+ * @param c <code>true</code> (default) to enable the event coalescing,
+ * <code>false</code> otherwise
+ */
+ public void setCoalesce(boolean c)
+ {
+ coalesce = c;
+ }
+
+ /**
+ * Checks if the Timer coalesces multiple pending event firings.
+ * If the coalescing is enabled, the multiple events that have not been
+ * fired on time are replaced by the single event. The events may not
+ * be fired on time if the application is busy.
+ *
+ * @return <code>true</code> if the coalescing is enabled,
+ * <code>false</code> otherwise
+ */
+ public boolean isCoalesce()
+ {
+ return coalesce;
+ }
+
+ /**
+ * Get the event listeners of the given type that are listening for the
+ * events, fired by this timer.
+ *
+ * @param listenerType the listener type (for example, ActionListener.class)
+ *
+ * @return the array of event listeners that are listening for the events,
+ * fired by this timer
+ * @since 1.3
+ */
+ public <T extends EventListener> T[] getListeners(Class<T> listenerType)
+ {
+ return listenerList.getListeners(listenerType);
+ }
+
+ /**
+ * Set the timer logging state. If it is set to <code>true</code>, the
+ * timer prints a message to {@link System#out} when firing each
+ * action event.
+ *
+ * @param lt <code>true</code> if logging is enabled, <code>false</code>
+ * (default value) otherwise
+ */
+ public static void setLogTimers(boolean lt)
+ {
+ logTimers = lt;
+ }
+
+ /**
+ * Return the logging state.
+ *
+ * @return <code>true</code> if the timer is printing a message to
+ * {@link System#out}
+ * when firing each action event
+ */
+ public static boolean getLogTimers()
+ {
+ return logTimers;
+ }
+
+ /**
+ * Set the delay between firing the subsequent events.
+ * This parameter does not change the value of the initial delay before
+ * firing the first event.
+ *
+ * @param d The time gap between the subsequent events, in milliseconds
+ *
+ * @throws IllegalArgumentException if <code>d</code> is less than zero.
+ */
+ public void setDelay(int d)
+ {
+ if (d < 0)
+ throw new IllegalArgumentException("Invalid delay: " + d);
+ delay = d;
+ }
+
+ /**
+ * Get the delay between firing the subsequent events.
+ *
+ * @return The delay between subsequent events, in milliseconds
+ */
+ public int getDelay()
+ {
+ return delay;
+ }
+
+ /**
+ * Set the intial delay before firing the first event since calling
+ * the {@link #start()} method. If the initial delay has not been
+ * set, it is assumed having the same value as the delay between the
+ * subsequent events.
+ *
+ * @param i the initial delay, in milliseconds
+ *
+ * @throws IllegalArgumentException if <code>i</code> is less than zero.
+ */
+ public void setInitialDelay(int i)
+ {
+ if (i < 0)
+ throw new IllegalArgumentException("Invalid initial delay: " + i);
+ initialDelay = i;
+ }
+
+ /**
+ * Get the intial delay before firing the first event since calling
+ * the {@link #start()} method. If the initial delay has not been
+ * set, returns the same value as {@link #getDelay()}.
+ *
+ * @return the initial delay before firing the first action event.
+ */
+ public int getInitialDelay()
+ {
+ return initialDelay;
+ }
+
+ /**
+ * Enable firing the repetetive events.
+ *
+ * @param r <code>true</code> (default value) to fire repetetive events.
+ * <code>false</code> to fire
+ * only one event after the initial delay
+ */
+ public void setRepeats(boolean r)
+ {
+ repeats = r;
+ }
+
+ /**
+ * Check is this timer fires repetetive events.
+ *
+ * @return <code>true</code> if the timer fires repetetive events,
+ * <code>false</code> if it fires
+ * only one event after the initial delay
+ */
+ public boolean isRepeats()
+ {
+ return repeats;
+ }
+
+ /**
+ * Get the timer state.
+ *
+ * @return <code>true</code> if the timer has been started and is firing
+ * the action events as scheduled. <code>false</code>
+ * if the timer is inactive.
+ */
+ public boolean isRunning()
+ {
+ return task != null;
+ }
+
+ /**
+ * Add the action listener
+ *
+ * @param listener the action listener to add
+ */
+ public void addActionListener(ActionListener listener)
+ {
+ listenerList.add(ActionListener.class, listener);
+ }
+
+ /**
+ * Remove the action listener.
+ *
+ * @param listener the action listener to remove
+ */
+ public void removeActionListener(ActionListener listener)
+ {
+ listenerList.remove(ActionListener.class, listener);
+ }
+
+ /**
+ * Cancel all pending tasks and fire the first event after the initial
+ * delay.
+ */
+ public void restart()
+ {
+ stop();
+ start();
+ }
+
+ /**
+ * Start firing the action events.
+ */
+ public void start()
+ {
+ Task t = task;
+ if (t == null)
+ {
+ t = new Task();
+ if (isRepeats())
+ timer.schedule(t, getInitialDelay(), getDelay());
+ else
+ timer.schedule(t, getInitialDelay());
+ task = t;
+ }
+ }
+
+ /**
+ * Stop firing the action events.
+ */
+ public void stop()
+ {
+ Task t = task;
+ if (t != null)
+ {
+ t.cancel();
+ task = null;
+ }
+ }
+
+ /**
+ * Fire the given action event to the action listeners.
+ *
+ * @param event the event to fire
+ */
+ protected void fireActionPerformed(ActionEvent event)
+ {
+ ActionListener[] listeners = getActionListeners();
+
+ for (int i = 0; i < listeners.length; i++)
+ listeners [ i ].actionPerformed(event);
+ }
+
+ /**
+ * Fire the action event, named "Timer" and having the numeric
+ * identifier, equal to the numer of events that have been
+ * already fired before.
+ */
+ void fireActionPerformed()
+ {
+ fireActionPerformed(new ActionEvent(this, ticks++, "Timer"));
+ }
+
+ /**
+ * Fire the queued action events.
+ * In the coalescing mode, a single event is fired as a replacement
+ * for all queued events. In non coalescing mode, a series of
+ * all queued events is fired.
+ * This is package-private to avoid an accessor method.
+ */
+ void drainEvents()
+ {
+ synchronized (queueLock)
+ {
+ if (isCoalesce())
+ {
+ if (queue > 0)
+ fireActionPerformed();
+ }
+ else
+ {
+ while (queue > 0)
+ {
+ fireActionPerformed();
+ queue--;
+ }
+ }
+ queue = 0;
+ }
+ }
+
+ /**
+ * Post a scheduled event to the event queue.
+ * Package-private to avoid an accessor method.
+ */
+ void queueEvent()
+ {
+ synchronized(queueLock)
+ {
+ queue++;
+ if (queue == 1)
+ SwingUtilities.invokeLater(drainer);
+ }
+ }
+}