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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
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 */

package com.sun.javafx.event;

import java.util.Arrays;
import java.util.Collections;
import java.util.HashSet;
import java.util.Set;
import javafx.event.EventDispatchChain;
import javafx.event.EventTarget;

public class CompositeEventTargetImpl implements CompositeEventTarget {
    private final Set eventTargets;

    public CompositeEventTargetImpl(final EventTarget... eventTargets) {
        final Set mutableSet =
                new HashSet(eventTargets.length);
        mutableSet.addAll(Arrays.asList(eventTargets));

        this.eventTargets = Collections.unmodifiableSet(mutableSet);
    }

    @Override
    public Set getTargets() {
        return eventTargets;
    }

    @Override
    public boolean containsTarget(EventTarget target) {
        return eventTargets.contains(target);
    }

    @Override
    public EventDispatchChain buildEventDispatchChain(
            final EventDispatchChain tail) {
        EventDispatchTree eventDispatchTree = (EventDispatchTree) tail;

        for (final EventTarget eventTarget: eventTargets) {
            final EventDispatchTree targetDispatchTree =
                    eventDispatchTree.createTree();
            eventDispatchTree = eventDispatchTree.mergeTree(
                    (EventDispatchTree) eventTarget.buildEventDispatchChain(
                                                        targetDispatchTree));
        }

        return eventDispatchTree;
    }
}