--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/java.desktop/share/classes/java/awt/AWTEventMulticaster.java Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,1121 @@
+/*
+ * Copyright (c) 1996, 2015, Oracle and/or its affiliates. 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. Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+package java.awt;
+
+import java.awt.event.*;
+import java.lang.reflect.Array;
+import java.util.EventListener;
+import java.io.Serializable;
+import java.io.ObjectOutputStream;
+import java.io.IOException;
+import java.util.EventListener;
+
+
+/**
+ * {@code AWTEventMulticaster} implements efficient and thread-safe multi-cast
+ * event dispatching for the AWT events defined in the {@code java.awt.event}
+ * package.
+ * <p>
+ * The following example illustrates how to use this class:
+ *
+ * <pre><code>
+ * public myComponent extends Component {
+ * ActionListener actionListener = null;
+ *
+ * public synchronized void addActionListener(ActionListener l) {
+ * actionListener = AWTEventMulticaster.add(actionListener, l);
+ * }
+ * public synchronized void removeActionListener(ActionListener l) {
+ * actionListener = AWTEventMulticaster.remove(actionListener, l);
+ * }
+ * public void processEvent(AWTEvent e) {
+ * // when event occurs which causes "action" semantic
+ * ActionListener listener = actionListener;
+ * if (listener != null) {
+ * listener.actionPerformed(new ActionEvent());
+ * }
+ * }
+ * }
+ * </code></pre>
+ * The important point to note is the first argument to the {@code
+ * add} and {@code remove} methods is the field maintaining the
+ * listeners. In addition you must assign the result of the {@code add}
+ * and {@code remove} methods to the field maintaining the listeners.
+ * <p>
+ * {@code AWTEventMulticaster} is implemented as a pair of {@code
+ * EventListeners} that are set at construction time. {@code
+ * AWTEventMulticaster} is immutable. The {@code add} and {@code
+ * remove} methods do not alter {@code AWTEventMulticaster} in
+ * anyway. If necessary, a new {@code AWTEventMulticaster} is
+ * created. In this way it is safe to add and remove listeners during
+ * the process of an event dispatching. However, event listeners
+ * added during the process of an event dispatch operation are not
+ * notified of the event currently being dispatched.
+ * <p>
+ * All of the {@code add} methods allow {@code null} arguments. If the
+ * first argument is {@code null}, the second argument is returned. If
+ * the first argument is not {@code null} and the second argument is
+ * {@code null}, the first argument is returned. If both arguments are
+ * {@code non-null}, a new {@code AWTEventMulticaster} is created using
+ * the two arguments and returned.
+ * <p>
+ * For the {@code remove} methods that take two arguments, the following is
+ * returned:
+ * <ul>
+ * <li>{@code null}, if the first argument is {@code null}, or
+ * the arguments are equal, by way of {@code ==}.
+ * <li>the first argument, if the first argument is not an instance of
+ * {@code AWTEventMulticaster}.
+ * <li>result of invoking {@code remove(EventListener)} on the
+ * first argument, supplying the second argument to the
+ * {@code remove(EventListener)} method.
+ * </ul>
+ * <p>Swing makes use of
+ * {@link javax.swing.event.EventListenerList EventListenerList} for
+ * similar logic. Refer to it for details.
+ *
+ * @see javax.swing.event.EventListenerList
+ *
+ * @author John Rose
+ * @author Amy Fowler
+ * @since 1.1
+ */
+
+public class AWTEventMulticaster implements
+ ComponentListener, ContainerListener, FocusListener, KeyListener,
+ MouseListener, MouseMotionListener, WindowListener, WindowFocusListener,
+ WindowStateListener, ActionListener, ItemListener, AdjustmentListener,
+ TextListener, InputMethodListener, HierarchyListener,
+ HierarchyBoundsListener, MouseWheelListener {
+
+ /**
+ * A variable in the event chain (listener-a)
+ */
+ protected final EventListener a;
+
+ /**
+ * A variable in the event chain (listener-b)
+ */
+ protected final EventListener b;
+
+ /**
+ * Creates an event multicaster instance which chains listener-a
+ * with listener-b. Input parameters {@code a} and {@code b}
+ * should not be {@code null}, though implementations may vary in
+ * choosing whether or not to throw {@code NullPointerException}
+ * in that case.
+ * @param a listener-a
+ * @param b listener-b
+ */
+ protected AWTEventMulticaster(EventListener a, EventListener b) {
+ this.a = a; this.b = b;
+ }
+
+ /**
+ * Removes a listener from this multicaster.
+ * <p>
+ * The returned multicaster contains all the listeners in this
+ * multicaster with the exception of all occurrences of {@code oldl}.
+ * If the resulting multicaster contains only one regular listener
+ * the regular listener may be returned. If the resulting multicaster
+ * is empty, then {@code null} may be returned instead.
+ * <p>
+ * No exception is thrown if {@code oldl} is {@code null}.
+ *
+ * @param oldl the listener to be removed
+ * @return resulting listener
+ */
+ protected EventListener remove(EventListener oldl) {
+ if (oldl == a) return b;
+ if (oldl == b) return a;
+ EventListener a2 = removeInternal(a, oldl);
+ EventListener b2 = removeInternal(b, oldl);
+ if (a2 == a && b2 == b) {
+ return this; // it's not here
+ }
+ return addInternal(a2, b2);
+ }
+
+ /**
+ * Handles the componentResized event by invoking the
+ * componentResized methods on listener-a and listener-b.
+ * @param e the component event
+ */
+ public void componentResized(ComponentEvent e) {
+ ((ComponentListener)a).componentResized(e);
+ ((ComponentListener)b).componentResized(e);
+ }
+
+ /**
+ * Handles the componentMoved event by invoking the
+ * componentMoved methods on listener-a and listener-b.
+ * @param e the component event
+ */
+ public void componentMoved(ComponentEvent e) {
+ ((ComponentListener)a).componentMoved(e);
+ ((ComponentListener)b).componentMoved(e);
+ }
+
+ /**
+ * Handles the componentShown event by invoking the
+ * componentShown methods on listener-a and listener-b.
+ * @param e the component event
+ */
+ public void componentShown(ComponentEvent e) {
+ ((ComponentListener)a).componentShown(e);
+ ((ComponentListener)b).componentShown(e);
+ }
+
+ /**
+ * Handles the componentHidden event by invoking the
+ * componentHidden methods on listener-a and listener-b.
+ * @param e the component event
+ */
+ public void componentHidden(ComponentEvent e) {
+ ((ComponentListener)a).componentHidden(e);
+ ((ComponentListener)b).componentHidden(e);
+ }
+
+ /**
+ * Handles the componentAdded container event by invoking the
+ * componentAdded methods on listener-a and listener-b.
+ * @param e the component event
+ */
+ public void componentAdded(ContainerEvent e) {
+ ((ContainerListener)a).componentAdded(e);
+ ((ContainerListener)b).componentAdded(e);
+ }
+
+ /**
+ * Handles the componentRemoved container event by invoking the
+ * componentRemoved methods on listener-a and listener-b.
+ * @param e the component event
+ */
+ public void componentRemoved(ContainerEvent e) {
+ ((ContainerListener)a).componentRemoved(e);
+ ((ContainerListener)b).componentRemoved(e);
+ }
+
+ /**
+ * Handles the focusGained event by invoking the
+ * focusGained methods on listener-a and listener-b.
+ * @param e the focus event
+ */
+ public void focusGained(FocusEvent e) {
+ ((FocusListener)a).focusGained(e);
+ ((FocusListener)b).focusGained(e);
+ }
+
+ /**
+ * Handles the focusLost event by invoking the
+ * focusLost methods on listener-a and listener-b.
+ * @param e the focus event
+ */
+ public void focusLost(FocusEvent e) {
+ ((FocusListener)a).focusLost(e);
+ ((FocusListener)b).focusLost(e);
+ }
+
+ /**
+ * Handles the keyTyped event by invoking the
+ * keyTyped methods on listener-a and listener-b.
+ * @param e the key event
+ */
+ public void keyTyped(KeyEvent e) {
+ ((KeyListener)a).keyTyped(e);
+ ((KeyListener)b).keyTyped(e);
+ }
+
+ /**
+ * Handles the keyPressed event by invoking the
+ * keyPressed methods on listener-a and listener-b.
+ * @param e the key event
+ */
+ public void keyPressed(KeyEvent e) {
+ ((KeyListener)a).keyPressed(e);
+ ((KeyListener)b).keyPressed(e);
+ }
+
+ /**
+ * Handles the keyReleased event by invoking the
+ * keyReleased methods on listener-a and listener-b.
+ * @param e the key event
+ */
+ public void keyReleased(KeyEvent e) {
+ ((KeyListener)a).keyReleased(e);
+ ((KeyListener)b).keyReleased(e);
+ }
+
+ /**
+ * Handles the mouseClicked event by invoking the
+ * mouseClicked methods on listener-a and listener-b.
+ * @param e the mouse event
+ */
+ public void mouseClicked(MouseEvent e) {
+ ((MouseListener)a).mouseClicked(e);
+ ((MouseListener)b).mouseClicked(e);
+ }
+
+ /**
+ * Handles the mousePressed event by invoking the
+ * mousePressed methods on listener-a and listener-b.
+ * @param e the mouse event
+ */
+ public void mousePressed(MouseEvent e) {
+ ((MouseListener)a).mousePressed(e);
+ ((MouseListener)b).mousePressed(e);
+ }
+
+ /**
+ * Handles the mouseReleased event by invoking the
+ * mouseReleased methods on listener-a and listener-b.
+ * @param e the mouse event
+ */
+ public void mouseReleased(MouseEvent e) {
+ ((MouseListener)a).mouseReleased(e);
+ ((MouseListener)b).mouseReleased(e);
+ }
+
+ /**
+ * Handles the mouseEntered event by invoking the
+ * mouseEntered methods on listener-a and listener-b.
+ * @param e the mouse event
+ */
+ public void mouseEntered(MouseEvent e) {
+ ((MouseListener)a).mouseEntered(e);
+ ((MouseListener)b).mouseEntered(e);
+ }
+
+ /**
+ * Handles the mouseExited event by invoking the
+ * mouseExited methods on listener-a and listener-b.
+ * @param e the mouse event
+ */
+ public void mouseExited(MouseEvent e) {
+ ((MouseListener)a).mouseExited(e);
+ ((MouseListener)b).mouseExited(e);
+ }
+
+ /**
+ * Handles the mouseDragged event by invoking the
+ * mouseDragged methods on listener-a and listener-b.
+ * @param e the mouse event
+ */
+ public void mouseDragged(MouseEvent e) {
+ ((MouseMotionListener)a).mouseDragged(e);
+ ((MouseMotionListener)b).mouseDragged(e);
+ }
+
+ /**
+ * Handles the mouseMoved event by invoking the
+ * mouseMoved methods on listener-a and listener-b.
+ * @param e the mouse event
+ */
+ public void mouseMoved(MouseEvent e) {
+ ((MouseMotionListener)a).mouseMoved(e);
+ ((MouseMotionListener)b).mouseMoved(e);
+ }
+
+ /**
+ * Handles the windowOpened event by invoking the
+ * windowOpened methods on listener-a and listener-b.
+ * @param e the window event
+ */
+ public void windowOpened(WindowEvent e) {
+ ((WindowListener)a).windowOpened(e);
+ ((WindowListener)b).windowOpened(e);
+ }
+
+ /**
+ * Handles the windowClosing event by invoking the
+ * windowClosing methods on listener-a and listener-b.
+ * @param e the window event
+ */
+ public void windowClosing(WindowEvent e) {
+ ((WindowListener)a).windowClosing(e);
+ ((WindowListener)b).windowClosing(e);
+ }
+
+ /**
+ * Handles the windowClosed event by invoking the
+ * windowClosed methods on listener-a and listener-b.
+ * @param e the window event
+ */
+ public void windowClosed(WindowEvent e) {
+ ((WindowListener)a).windowClosed(e);
+ ((WindowListener)b).windowClosed(e);
+ }
+
+ /**
+ * Handles the windowIconified event by invoking the
+ * windowIconified methods on listener-a and listener-b.
+ * @param e the window event
+ */
+ public void windowIconified(WindowEvent e) {
+ ((WindowListener)a).windowIconified(e);
+ ((WindowListener)b).windowIconified(e);
+ }
+
+ /**
+ * Handles the windowDeiconified event by invoking the
+ * windowDeiconified methods on listener-a and listener-b.
+ * @param e the window event
+ */
+ public void windowDeiconified(WindowEvent e) {
+ ((WindowListener)a).windowDeiconified(e);
+ ((WindowListener)b).windowDeiconified(e);
+ }
+
+ /**
+ * Handles the windowActivated event by invoking the
+ * windowActivated methods on listener-a and listener-b.
+ * @param e the window event
+ */
+ public void windowActivated(WindowEvent e) {
+ ((WindowListener)a).windowActivated(e);
+ ((WindowListener)b).windowActivated(e);
+ }
+
+ /**
+ * Handles the windowDeactivated event by invoking the
+ * windowDeactivated methods on listener-a and listener-b.
+ * @param e the window event
+ */
+ public void windowDeactivated(WindowEvent e) {
+ ((WindowListener)a).windowDeactivated(e);
+ ((WindowListener)b).windowDeactivated(e);
+ }
+
+ /**
+ * Handles the windowStateChanged event by invoking the
+ * windowStateChanged methods on listener-a and listener-b.
+ * @param e the window event
+ * @since 1.4
+ */
+ public void windowStateChanged(WindowEvent e) {
+ ((WindowStateListener)a).windowStateChanged(e);
+ ((WindowStateListener)b).windowStateChanged(e);
+ }
+
+
+ /**
+ * Handles the windowGainedFocus event by invoking the windowGainedFocus
+ * methods on listener-a and listener-b.
+ * @param e the window event
+ * @since 1.4
+ */
+ public void windowGainedFocus(WindowEvent e) {
+ ((WindowFocusListener)a).windowGainedFocus(e);
+ ((WindowFocusListener)b).windowGainedFocus(e);
+ }
+
+ /**
+ * Handles the windowLostFocus event by invoking the windowLostFocus
+ * methods on listener-a and listener-b.
+ * @param e the window event
+ * @since 1.4
+ */
+ public void windowLostFocus(WindowEvent e) {
+ ((WindowFocusListener)a).windowLostFocus(e);
+ ((WindowFocusListener)b).windowLostFocus(e);
+ }
+
+ /**
+ * Handles the actionPerformed event by invoking the
+ * actionPerformed methods on listener-a and listener-b.
+ * @param e the action event
+ */
+ public void actionPerformed(ActionEvent e) {
+ ((ActionListener)a).actionPerformed(e);
+ ((ActionListener)b).actionPerformed(e);
+ }
+
+ /**
+ * Handles the itemStateChanged event by invoking the
+ * itemStateChanged methods on listener-a and listener-b.
+ * @param e the item event
+ */
+ public void itemStateChanged(ItemEvent e) {
+ ((ItemListener)a).itemStateChanged(e);
+ ((ItemListener)b).itemStateChanged(e);
+ }
+
+ /**
+ * Handles the adjustmentValueChanged event by invoking the
+ * adjustmentValueChanged methods on listener-a and listener-b.
+ * @param e the adjustment event
+ */
+ public void adjustmentValueChanged(AdjustmentEvent e) {
+ ((AdjustmentListener)a).adjustmentValueChanged(e);
+ ((AdjustmentListener)b).adjustmentValueChanged(e);
+ }
+ public void textValueChanged(TextEvent e) {
+ ((TextListener)a).textValueChanged(e);
+ ((TextListener)b).textValueChanged(e);
+ }
+
+ /**
+ * Handles the inputMethodTextChanged event by invoking the
+ * inputMethodTextChanged methods on listener-a and listener-b.
+ * @param e the item event
+ */
+ public void inputMethodTextChanged(InputMethodEvent e) {
+ ((InputMethodListener)a).inputMethodTextChanged(e);
+ ((InputMethodListener)b).inputMethodTextChanged(e);
+ }
+
+ /**
+ * Handles the caretPositionChanged event by invoking the
+ * caretPositionChanged methods on listener-a and listener-b.
+ * @param e the item event
+ */
+ public void caretPositionChanged(InputMethodEvent e) {
+ ((InputMethodListener)a).caretPositionChanged(e);
+ ((InputMethodListener)b).caretPositionChanged(e);
+ }
+
+ /**
+ * Handles the hierarchyChanged event by invoking the
+ * hierarchyChanged methods on listener-a and listener-b.
+ * @param e the item event
+ * @since 1.3
+ */
+ public void hierarchyChanged(HierarchyEvent e) {
+ ((HierarchyListener)a).hierarchyChanged(e);
+ ((HierarchyListener)b).hierarchyChanged(e);
+ }
+
+ /**
+ * Handles the ancestorMoved event by invoking the
+ * ancestorMoved methods on listener-a and listener-b.
+ * @param e the item event
+ * @since 1.3
+ */
+ public void ancestorMoved(HierarchyEvent e) {
+ ((HierarchyBoundsListener)a).ancestorMoved(e);
+ ((HierarchyBoundsListener)b).ancestorMoved(e);
+ }
+
+ /**
+ * Handles the ancestorResized event by invoking the
+ * ancestorResized methods on listener-a and listener-b.
+ * @param e the item event
+ * @since 1.3
+ */
+ public void ancestorResized(HierarchyEvent e) {
+ ((HierarchyBoundsListener)a).ancestorResized(e);
+ ((HierarchyBoundsListener)b).ancestorResized(e);
+ }
+
+ /**
+ * Handles the mouseWheelMoved event by invoking the
+ * mouseWheelMoved methods on listener-a and listener-b.
+ * @param e the mouse event
+ * @since 1.4
+ */
+ public void mouseWheelMoved(MouseWheelEvent e) {
+ ((MouseWheelListener)a).mouseWheelMoved(e);
+ ((MouseWheelListener)b).mouseWheelMoved(e);
+ }
+
+ /**
+ * Adds component-listener-a with component-listener-b and
+ * returns the resulting multicast listener.
+ * @param a component-listener-a
+ * @param b component-listener-b
+ * @return the resulting listener
+ */
+ public static ComponentListener add(ComponentListener a, ComponentListener b) {
+ return (ComponentListener)addInternal(a, b);
+ }
+
+ /**
+ * Adds container-listener-a with container-listener-b and
+ * returns the resulting multicast listener.
+ * @param a container-listener-a
+ * @param b container-listener-b
+ * @return the resulting listener
+ */
+ public static ContainerListener add(ContainerListener a, ContainerListener b) {
+ return (ContainerListener)addInternal(a, b);
+ }
+
+ /**
+ * Adds focus-listener-a with focus-listener-b and
+ * returns the resulting multicast listener.
+ * @param a focus-listener-a
+ * @param b focus-listener-b
+ * @return the resulting listener
+ */
+ public static FocusListener add(FocusListener a, FocusListener b) {
+ return (FocusListener)addInternal(a, b);
+ }
+
+ /**
+ * Adds key-listener-a with key-listener-b and
+ * returns the resulting multicast listener.
+ * @param a key-listener-a
+ * @param b key-listener-b
+ * @return the resulting listener
+ */
+ public static KeyListener add(KeyListener a, KeyListener b) {
+ return (KeyListener)addInternal(a, b);
+ }
+
+ /**
+ * Adds mouse-listener-a with mouse-listener-b and
+ * returns the resulting multicast listener.
+ * @param a mouse-listener-a
+ * @param b mouse-listener-b
+ * @return the resulting listener
+ */
+ public static MouseListener add(MouseListener a, MouseListener b) {
+ return (MouseListener)addInternal(a, b);
+ }
+
+ /**
+ * Adds mouse-motion-listener-a with mouse-motion-listener-b and
+ * returns the resulting multicast listener.
+ * @param a mouse-motion-listener-a
+ * @param b mouse-motion-listener-b
+ * @return the resulting listener
+ */
+ public static MouseMotionListener add(MouseMotionListener a, MouseMotionListener b) {
+ return (MouseMotionListener)addInternal(a, b);
+ }
+
+ /**
+ * Adds window-listener-a with window-listener-b and
+ * returns the resulting multicast listener.
+ * @param a window-listener-a
+ * @param b window-listener-b
+ * @return the resulting listener
+ */
+ public static WindowListener add(WindowListener a, WindowListener b) {
+ return (WindowListener)addInternal(a, b);
+ }
+
+ /**
+ * Adds window-state-listener-a with window-state-listener-b
+ * and returns the resulting multicast listener.
+ * @param a window-state-listener-a
+ * @param b window-state-listener-b
+ * @return the resulting listener
+ * @since 1.4
+ */
+ @SuppressWarnings("overloads")
+ public static WindowStateListener add(WindowStateListener a,
+ WindowStateListener b) {
+ return (WindowStateListener)addInternal(a, b);
+ }
+
+ /**
+ * Adds window-focus-listener-a with window-focus-listener-b
+ * and returns the resulting multicast listener.
+ * @param a window-focus-listener-a
+ * @param b window-focus-listener-b
+ * @return the resulting listener
+ * @since 1.4
+ */
+ public static WindowFocusListener add(WindowFocusListener a,
+ WindowFocusListener b) {
+ return (WindowFocusListener)addInternal(a, b);
+ }
+
+ /**
+ * Adds action-listener-a with action-listener-b and
+ * returns the resulting multicast listener.
+ * @param a action-listener-a
+ * @param b action-listener-b
+ * @return the resulting listener
+ */
+ @SuppressWarnings("overloads")
+ public static ActionListener add(ActionListener a, ActionListener b) {
+ return (ActionListener)addInternal(a, b);
+ }
+
+ /**
+ * Adds item-listener-a with item-listener-b and
+ * returns the resulting multicast listener.
+ * @param a item-listener-a
+ * @param b item-listener-b
+ * @return the resulting listener
+ */
+ @SuppressWarnings("overloads")
+ public static ItemListener add(ItemListener a, ItemListener b) {
+ return (ItemListener)addInternal(a, b);
+ }
+
+ /**
+ * Adds adjustment-listener-a with adjustment-listener-b and
+ * returns the resulting multicast listener.
+ * @param a adjustment-listener-a
+ * @param b adjustment-listener-b
+ * @return the resulting listener
+ */
+ @SuppressWarnings("overloads")
+ public static AdjustmentListener add(AdjustmentListener a, AdjustmentListener b) {
+ return (AdjustmentListener)addInternal(a, b);
+ }
+
+ /**
+ * Adds text-listener-a with text-listener-b and
+ * returns the resulting multicast listener.
+ *
+ * @param a text-listener-a
+ * @param b text-listener-b
+ * @return the resulting listener
+ */
+ @SuppressWarnings("overloads")
+ public static TextListener add(TextListener a, TextListener b) {
+ return (TextListener)addInternal(a, b);
+ }
+
+ /**
+ * Adds input-method-listener-a with input-method-listener-b and
+ * returns the resulting multicast listener.
+ * @param a input-method-listener-a
+ * @param b input-method-listener-b
+ * @return the resulting listener
+ */
+ public static InputMethodListener add(InputMethodListener a, InputMethodListener b) {
+ return (InputMethodListener)addInternal(a, b);
+ }
+
+ /**
+ * Adds hierarchy-listener-a with hierarchy-listener-b and
+ * returns the resulting multicast listener.
+ * @param a hierarchy-listener-a
+ * @param b hierarchy-listener-b
+ * @return the resulting listener
+ * @since 1.3
+ */
+ @SuppressWarnings("overloads")
+ public static HierarchyListener add(HierarchyListener a, HierarchyListener b) {
+ return (HierarchyListener)addInternal(a, b);
+ }
+
+ /**
+ * Adds hierarchy-bounds-listener-a with hierarchy-bounds-listener-b and
+ * returns the resulting multicast listener.
+ * @param a hierarchy-bounds-listener-a
+ * @param b hierarchy-bounds-listener-b
+ * @return the resulting listener
+ * @since 1.3
+ */
+ public static HierarchyBoundsListener add(HierarchyBoundsListener a, HierarchyBoundsListener b) {
+ return (HierarchyBoundsListener)addInternal(a, b);
+ }
+
+ /**
+ * Adds mouse-wheel-listener-a with mouse-wheel-listener-b and
+ * returns the resulting multicast listener.
+ * @param a mouse-wheel-listener-a
+ * @param b mouse-wheel-listener-b
+ * @return the resulting listener
+ * @since 1.4
+ */
+ @SuppressWarnings("overloads")
+ public static MouseWheelListener add(MouseWheelListener a,
+ MouseWheelListener b) {
+ return (MouseWheelListener)addInternal(a, b);
+ }
+
+ /**
+ * Removes the old component-listener from component-listener-l and
+ * returns the resulting multicast listener.
+ * @param l component-listener-l
+ * @param oldl the component-listener being removed
+ * @return the resulting listener
+ */
+ public static ComponentListener remove(ComponentListener l, ComponentListener oldl) {
+ return (ComponentListener) removeInternal(l, oldl);
+ }
+
+ /**
+ * Removes the old container-listener from container-listener-l and
+ * returns the resulting multicast listener.
+ * @param l container-listener-l
+ * @param oldl the container-listener being removed
+ * @return the resulting listener
+ */
+ public static ContainerListener remove(ContainerListener l, ContainerListener oldl) {
+ return (ContainerListener) removeInternal(l, oldl);
+ }
+
+ /**
+ * Removes the old focus-listener from focus-listener-l and
+ * returns the resulting multicast listener.
+ * @param l focus-listener-l
+ * @param oldl the focus-listener being removed
+ * @return the resulting listener
+ */
+ public static FocusListener remove(FocusListener l, FocusListener oldl) {
+ return (FocusListener) removeInternal(l, oldl);
+ }
+
+ /**
+ * Removes the old key-listener from key-listener-l and
+ * returns the resulting multicast listener.
+ * @param l key-listener-l
+ * @param oldl the key-listener being removed
+ * @return the resulting listener
+ */
+ public static KeyListener remove(KeyListener l, KeyListener oldl) {
+ return (KeyListener) removeInternal(l, oldl);
+ }
+
+ /**
+ * Removes the old mouse-listener from mouse-listener-l and
+ * returns the resulting multicast listener.
+ * @param l mouse-listener-l
+ * @param oldl the mouse-listener being removed
+ * @return the resulting listener
+ */
+ public static MouseListener remove(MouseListener l, MouseListener oldl) {
+ return (MouseListener) removeInternal(l, oldl);
+ }
+
+ /**
+ * Removes the old mouse-motion-listener from mouse-motion-listener-l
+ * and returns the resulting multicast listener.
+ * @param l mouse-motion-listener-l
+ * @param oldl the mouse-motion-listener being removed
+ * @return the resulting listener
+ */
+ public static MouseMotionListener remove(MouseMotionListener l, MouseMotionListener oldl) {
+ return (MouseMotionListener) removeInternal(l, oldl);
+ }
+
+ /**
+ * Removes the old window-listener from window-listener-l and
+ * returns the resulting multicast listener.
+ * @param l window-listener-l
+ * @param oldl the window-listener being removed
+ * @return the resulting listener
+ */
+ public static WindowListener remove(WindowListener l, WindowListener oldl) {
+ return (WindowListener) removeInternal(l, oldl);
+ }
+
+ /**
+ * Removes the old window-state-listener from window-state-listener-l
+ * and returns the resulting multicast listener.
+ * @param l window-state-listener-l
+ * @param oldl the window-state-listener being removed
+ * @return the resulting listener
+ * @since 1.4
+ */
+ @SuppressWarnings("overloads")
+ public static WindowStateListener remove(WindowStateListener l,
+ WindowStateListener oldl) {
+ return (WindowStateListener) removeInternal(l, oldl);
+ }
+
+ /**
+ * Removes the old window-focus-listener from window-focus-listener-l
+ * and returns the resulting multicast listener.
+ * @param l window-focus-listener-l
+ * @param oldl the window-focus-listener being removed
+ * @return the resulting listener
+ * @since 1.4
+ */
+ public static WindowFocusListener remove(WindowFocusListener l,
+ WindowFocusListener oldl) {
+ return (WindowFocusListener) removeInternal(l, oldl);
+ }
+
+ /**
+ * Removes the old action-listener from action-listener-l and
+ * returns the resulting multicast listener.
+ * @param l action-listener-l
+ * @param oldl the action-listener being removed
+ * @return the resulting listener
+ */
+ @SuppressWarnings("overloads")
+ public static ActionListener remove(ActionListener l, ActionListener oldl) {
+ return (ActionListener) removeInternal(l, oldl);
+ }
+
+ /**
+ * Removes the old item-listener from item-listener-l and
+ * returns the resulting multicast listener.
+ * @param l item-listener-l
+ * @param oldl the item-listener being removed
+ * @return the resulting listener
+ */
+ @SuppressWarnings("overloads")
+ public static ItemListener remove(ItemListener l, ItemListener oldl) {
+ return (ItemListener) removeInternal(l, oldl);
+ }
+
+ /**
+ * Removes the old adjustment-listener from adjustment-listener-l and
+ * returns the resulting multicast listener.
+ * @param l adjustment-listener-l
+ * @param oldl the adjustment-listener being removed
+ * @return the resulting listener
+ */
+ @SuppressWarnings("overloads")
+ public static AdjustmentListener remove(AdjustmentListener l, AdjustmentListener oldl) {
+ return (AdjustmentListener) removeInternal(l, oldl);
+ }
+
+ /**
+ * Removes the old text-listener from text-listener-l and
+ * returns the resulting multicast listener.
+ *
+ * @param l text-listener-l
+ * @param oldl the text-listener being removed
+ * @return the resulting listener
+ */
+ @SuppressWarnings("overloads")
+ public static TextListener remove(TextListener l, TextListener oldl) {
+ return (TextListener) removeInternal(l, oldl);
+ }
+
+ /**
+ * Removes the old input-method-listener from input-method-listener-l and
+ * returns the resulting multicast listener.
+ * @param l input-method-listener-l
+ * @param oldl the input-method-listener being removed
+ * @return the resulting listener
+ */
+ public static InputMethodListener remove(InputMethodListener l, InputMethodListener oldl) {
+ return (InputMethodListener) removeInternal(l, oldl);
+ }
+
+ /**
+ * Removes the old hierarchy-listener from hierarchy-listener-l and
+ * returns the resulting multicast listener.
+ * @param l hierarchy-listener-l
+ * @param oldl the hierarchy-listener being removed
+ * @return the resulting listener
+ * @since 1.3
+ */
+ @SuppressWarnings("overloads")
+ public static HierarchyListener remove(HierarchyListener l, HierarchyListener oldl) {
+ return (HierarchyListener) removeInternal(l, oldl);
+ }
+
+ /**
+ * Removes the old hierarchy-bounds-listener from
+ * hierarchy-bounds-listener-l and returns the resulting multicast
+ * listener.
+ * @param l hierarchy-bounds-listener-l
+ * @param oldl the hierarchy-bounds-listener being removed
+ * @return the resulting listener
+ * @since 1.3
+ */
+ public static HierarchyBoundsListener remove(HierarchyBoundsListener l, HierarchyBoundsListener oldl) {
+ return (HierarchyBoundsListener) removeInternal(l, oldl);
+ }
+
+ /**
+ * Removes the old mouse-wheel-listener from mouse-wheel-listener-l
+ * and returns the resulting multicast listener.
+ * @param l mouse-wheel-listener-l
+ * @param oldl the mouse-wheel-listener being removed
+ * @return the resulting listener
+ * @since 1.4
+ */
+ @SuppressWarnings("overloads")
+ public static MouseWheelListener remove(MouseWheelListener l,
+ MouseWheelListener oldl) {
+ return (MouseWheelListener) removeInternal(l, oldl);
+ }
+
+ /**
+ * Returns the resulting multicast listener from adding listener-a
+ * and listener-b together.
+ * If listener-a is null, it returns listener-b;
+ * If listener-b is null, it returns listener-a
+ * If neither are null, then it creates and returns
+ * a new AWTEventMulticaster instance which chains a with b.
+ * @param a event listener-a
+ * @param b event listener-b
+ * @return the resulting listener
+ */
+ protected static EventListener addInternal(EventListener a, EventListener b) {
+ if (a == null) return b;
+ if (b == null) return a;
+ return new AWTEventMulticaster(a, b);
+ }
+
+ /**
+ * Returns the resulting multicast listener after removing the
+ * old listener from listener-l.
+ * If listener-l equals the old listener OR listener-l is null,
+ * returns null.
+ * Else if listener-l is an instance of AWTEventMulticaster,
+ * then it removes the old listener from it.
+ * Else, returns listener l.
+ * @param l the listener being removed from
+ * @param oldl the listener being removed
+ * @return the resulting listener
+ */
+ protected static EventListener removeInternal(EventListener l, EventListener oldl) {
+ if (l == oldl || l == null) {
+ return null;
+ } else if (l instanceof AWTEventMulticaster) {
+ return ((AWTEventMulticaster)l).remove(oldl);
+ } else {
+ return l; // it's not here
+ }
+ }
+
+
+ /**
+ * Serialization support. Saves all Serializable listeners
+ * to a serialization stream.
+ *
+ * @param s the stream to save to
+ * @param k a prefix stream to put before each serializable listener
+ * @throws IOException if serialization fails
+ */
+ protected void saveInternal(ObjectOutputStream s, String k) throws IOException {
+ if (a instanceof AWTEventMulticaster) {
+ ((AWTEventMulticaster)a).saveInternal(s, k);
+ }
+ else if (a instanceof Serializable) {
+ s.writeObject(k);
+ s.writeObject(a);
+ }
+
+ if (b instanceof AWTEventMulticaster) {
+ ((AWTEventMulticaster)b).saveInternal(s, k);
+ }
+ else if (b instanceof Serializable) {
+ s.writeObject(k);
+ s.writeObject(b);
+ }
+ }
+
+ /**
+ * Saves a Serializable listener chain to a serialization stream.
+ *
+ * @param s the stream to save to
+ * @param k a prefix stream to put before each serializable listener
+ * @param l the listener chain to save
+ * @throws IOException if serialization fails
+ */
+ protected static void save(ObjectOutputStream s, String k, EventListener l) throws IOException {
+ if (l == null) {
+ return;
+ }
+ else if (l instanceof AWTEventMulticaster) {
+ ((AWTEventMulticaster)l).saveInternal(s, k);
+ }
+ else if (l instanceof Serializable) {
+ s.writeObject(k);
+ s.writeObject(l);
+ }
+ }
+
+ /*
+ * Recursive method which returns a count of the number of listeners in
+ * EventListener, handling the (common) case of l actually being an
+ * AWTEventMulticaster. Additionally, only listeners of type listenerType
+ * are counted. Method modified to fix bug 4513402. -bchristi
+ */
+ private static int getListenerCount(EventListener l, Class<?> listenerType) {
+ if (l instanceof AWTEventMulticaster) {
+ AWTEventMulticaster mc = (AWTEventMulticaster)l;
+ return getListenerCount(mc.a, listenerType) +
+ getListenerCount(mc.b, listenerType);
+ }
+ else {
+ // Only count listeners of correct type
+ return listenerType.isInstance(l) ? 1 : 0;
+ }
+ }
+
+ /*
+ * Recursive method which populates EventListener array a with EventListeners
+ * from l. l is usually an AWTEventMulticaster. Bug 4513402 revealed that
+ * if l differed in type from the element type of a, an ArrayStoreException
+ * would occur. Now l is only inserted into a if it's of the appropriate
+ * type. -bchristi
+ */
+ private static int populateListenerArray(EventListener[] a, EventListener l, int index) {
+ if (l instanceof AWTEventMulticaster) {
+ AWTEventMulticaster mc = (AWTEventMulticaster)l;
+ int lhs = populateListenerArray(a, mc.a, index);
+ return populateListenerArray(a, mc.b, lhs);
+ }
+ else if (a.getClass().getComponentType().isInstance(l)) {
+ a[index] = l;
+ return index + 1;
+ }
+ // Skip nulls, instances of wrong class
+ else {
+ return index;
+ }
+ }
+
+ /**
+ * Returns an array of all the objects chained as
+ * <code><em>Foo</em>Listener</code>s by the specified
+ * {@code java.util.EventListener}.
+ * <code><em>Foo</em>Listener</code>s are chained by the
+ * {@code AWTEventMulticaster} using the
+ * <code>add<em>Foo</em>Listener</code> method.
+ * If a {@code null} listener is specified, this method returns an
+ * empty array. If the specified listener is not an instance of
+ * {@code AWTEventMulticaster}, this method returns an array which
+ * contains only the specified listener. If no such listeners are chained,
+ * this method returns an empty array.
+ *
+ * @param <T> the listener type
+ * @param l the specified {@code java.util.EventListener}
+ * @param listenerType the type of listeners requested; this parameter
+ * should specify an interface that descends from
+ * {@code java.util.EventListener}
+ * @return an array of all objects chained as
+ * <code><em>Foo</em>Listener</code>s by the specified multicast
+ * listener, or an empty array if no such listeners have been
+ * chained by the specified multicast listener
+ * @exception NullPointerException if the specified
+ * {@code listenertype} parameter is {@code null}
+ * @exception ClassCastException if {@code listenerType}
+ * doesn't specify a class or interface that implements
+ * {@code java.util.EventListener}
+ *
+ * @since 1.4
+ */
+ @SuppressWarnings("unchecked")
+ public static <T extends EventListener> T[]
+ getListeners(EventListener l, Class<T> listenerType)
+ {
+ if (listenerType == null) {
+ throw new NullPointerException ("Listener type should not be null");
+ }
+
+ int n = getListenerCount(l, listenerType);
+ T[] result = (T[])Array.newInstance(listenerType, n);
+ populateListenerArray(result, l, 0);
+ return result;
+ }
+}