1 /*

     2  * Copyright (c) 2005, 2015, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.  Oracle designates this

     8  * particular file as subject to the "Classpath" exception as provided

     9  * by Oracle in the LICENSE file that accompanied this code.

    10  *

    11  * This code is distributed in the hope that it will be useful, but WITHOUT

    12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    14  * version 2 for more details (a copy is included in the LICENSE file that

    15  * accompanied this code).

    16  *

    17  * You should have received a copy of the GNU General Public License version

    18  * 2 along with this work; if not, write to the Free Software Foundation,

    19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    20  *

    21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    22  * or visit www.oracle.com if you need additional information or have any

    23  * questions.

    24  */

    25 

    26 package com.sun.java.accessibility.util;

    27 

    28 import java.awt.*;

    29 import java.util.EventListener;

    30 import javax.accessibility.*;

    31 

    32 

    33 /**

    34  * The TopLevelWindowMulticaster class is used to maintain a list of

    35  * TopLevelWindowListener classes.  It is intended to be used primarily

    36  * for internal support in the EventQueueMonitor class, and is not intended

    37  * to be used by classes outside the Java Accessibility Utility package.

    38  *

    39  * @see EventQueueMonitor

    40  * @see EventQueueMonitor#addTopLevelWindowListener

    41  * @see EventQueueMonitor#removeTopLevelWindowListener

    42  *

    43  */

    44 class TopLevelWindowMulticaster

    45     extends AWTEventMulticaster implements TopLevelWindowListener

    46 {

    47     protected TopLevelWindowMulticaster(EventListener a, EventListener b) {

    48         super(a, b);

    49     }

    50 

    51     public void topLevelWindowCreated(Window w) {

    52         ((TopLevelWindowListener)a).topLevelWindowCreated(w);

    53         ((TopLevelWindowListener)b).topLevelWindowCreated(w);

    54     }

    55 

    56     public void topLevelWindowDestroyed(Window w) {

    57         ((TopLevelWindowListener)a).topLevelWindowDestroyed(w);

    58         ((TopLevelWindowListener)b).topLevelWindowDestroyed(w);

    59     }

    60 

    61     public static TopLevelWindowListener add(TopLevelWindowListener a, TopLevelWindowListener b) {

    62         return (TopLevelWindowListener)addInternal(a, b);

    63     }

    64 

    65     public static TopLevelWindowListener remove(TopLevelWindowListener l, TopLevelWindowListener oldl) {

    66         return (TopLevelWindowListener)removeInternal(l, oldl);

    67     }

    68 

    69     protected static EventListener addInternal(EventListener a, EventListener b) {

    70         if (a == null)  return b;

    71         if (b == null)  return a;

    72         return new TopLevelWindowMulticaster(a, b);

    73     }

    74 

    75     protected static EventListener removeInternal(EventListener l, EventListener oldl) {

    76         if (l == oldl || l == null) {

    77             return null;

    78         } else if (l instanceof TopLevelWindowMulticaster) {

    79             return ((TopLevelWindowMulticaster)l).remove(oldl);

    80         } else {

    81             return l;           // it's not here

    82         }

    83     }

    84 

    85 }