/*
 * Copyright (c) 2005, 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
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 */

package com.sun.java.accessibility.util;

import java.awt.*;
import java.util.EventListener;
import javax.accessibility.*;


The GUIInitializedMulticaster class is used to maintain a list of
GUIInitializedListener classes.  It is intended to be used primarily
for internal support in the EventQueueMonitor class, and is not intended
to be used by classes outside the Java Accessibility Utility package.
See Also:
EventQueueMonitor
EventQueueMonitor.addGUIInitializedListener
EventQueueMonitor.removeGUIInitializedListener/**
 * The GUIInitializedMulticaster class is used to maintain a list of
 * GUIInitializedListener classes.  It is intended to be used primarily
 * for internal support in the EventQueueMonitor class, and is not intended
 * to be used by classes outside the Java Accessibility Utility package.
 *
 * @see EventQueueMonitor
 * @see EventQueueMonitor#addGUIInitializedListener
 * @see EventQueueMonitor#removeGUIInitializedListener
 *
 */
class GUIInitializedMulticaster
    extends AWTEventMulticaster implements GUIInitializedListener
{
    protected GUIInitializedMulticaster(EventListener a, EventListener b) {
        super(a, b);
    }

    public void guiInitialized() {
        ((GUIInitializedListener)a).guiInitialized();
        ((GUIInitializedListener)b).guiInitialized();
    }

    public static GUIInitializedListener add(GUIInitializedListener a, GUIInitializedListener b) {
        return (GUIInitializedListener)addInternal(a, b);
    }

    public static GUIInitializedListener remove(GUIInitializedListener l, GUIInitializedListener oldl) {
        return (GUIInitializedListener)removeInternal(l, oldl);
    }

    protected static EventListener addInternal(EventListener a, EventListener b) {
        if (a == null)  return b;
        if (b == null)  return a;
        return new GUIInitializedMulticaster(a, b);
    }

    protected static EventListener removeInternal(EventListener l, EventListener oldl) {
        if (l == oldl || l == null) {
            return null;
        } else if (l instanceof GUIInitializedMulticaster) {
            return ((GUIInitializedMulticaster)l).remove(oldl);
        } else {
            return l;           // it's not here
        }
    }

}