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This is a backport of OpenJFX 8 to run on Java 7.
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/*
 * Copyright (c) 2011, 2013, 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 com.sun.javafx.event;

import javafx.event.Event;

/**
 * An {@code EventDispatcher} which represents a chain of event dispatchers, but
 * can still be set or replaced as a single entity.
 */
public abstract class CompositeEventDispatcher extends BasicEventDispatcher {
    public abstract BasicEventDispatcher getFirstDispatcher();

    public abstract BasicEventDispatcher getLastDispatcher();

    @Override
    public final Event dispatchCapturingEvent(Event event) {
        BasicEventDispatcher childDispatcher = getFirstDispatcher();
        while (childDispatcher != null) {
            event = childDispatcher.dispatchCapturingEvent(event);
            if (event.isConsumed()) {
                break;
            }

            childDispatcher = childDispatcher.getNextDispatcher();
        }

        return event;
    }

    @Override
    public final Event dispatchBubblingEvent(Event event) {
        // need to dispatch in reversed direction
        BasicEventDispatcher childDispatcher = getLastDispatcher();
        while (childDispatcher != null) {
            event = childDispatcher.dispatchBubblingEvent(event);
            if (event.isConsumed()) {
                break;
            }

            childDispatcher = childDispatcher.getPreviousDispatcher();
        }

        return event;
    }
}