/*
 * Copyright (c) 2010, 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
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 */

package com.sun.javafx.event;

import javafx.event.Event;
import javafx.event.EventDispatchChain;
import javafx.event.EventDispatcher;

public final class PathChangingDispatcher implements EventDispatcher {
    private final EventDispatcher prependDispatcher;
    private final EventDispatcher appendDispatcher;
    private final int dispatchCount;

    public PathChangingDispatcher(final EventDispatcher prependDispatcher,
                                  final EventDispatcher appendDispatcher,
                                  final int dispatchCount) {
        this.prependDispatcher = prependDispatcher;
        this.appendDispatcher = appendDispatcher;
        this.dispatchCount = dispatchCount;
    }

    @Override
    public Event dispatchEvent(Event event, EventDispatchChain tail) {
        if (prependDispatcher != null) {
            tail = tail.prepend(prependDispatcher);
        }
        if (appendDispatcher != null) {
            tail = tail.append(appendDispatcher);
        }

        for (int i = 0; i < dispatchCount; ++i) {
            event = tail.dispatchEvent(event);
        }

        return event;
    }
}
