1 /* 2 * Copyright (c) 2010, 2013, 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.javafx.event; 27 28 import java.util.LinkedList; 29 import java.util.List; 30 31 import javafx.event.Event; 32 import javafx.event.EventDispatchChain; 33 import javafx.event.EventDispatcher; 34 35 public final class StubEventDispatchChain implements EventDispatchChain { 36 private final LinkedList<EventDispatcher> eventDispatchers; 37 38 public static final EventDispatchChain EMPTY_CHAIN = 39 new StubEventDispatchChain(); 40 41 private StubEventDispatchChain() { 42 this(new LinkedList<EventDispatcher>()); 43 } 44 45 private StubEventDispatchChain( 46 final LinkedList<EventDispatcher> eventDispatchers) { 47 this.eventDispatchers = eventDispatchers; 48 } 49 50 @Override 51 public EventDispatchChain append(final EventDispatcher eventDispatcher) { 52 final LinkedList<EventDispatcher> newDispatchers = 53 copyDispatchers(eventDispatchers); 54 newDispatchers.addLast(eventDispatcher); 55 return new StubEventDispatchChain(newDispatchers); 56 } 57 58 @Override 59 public EventDispatchChain prepend(final EventDispatcher eventDispatcher) { 60 final LinkedList<EventDispatcher> newDispatchers = 61 copyDispatchers(eventDispatchers); 62 newDispatchers.addFirst(eventDispatcher); 63 return new StubEventDispatchChain(newDispatchers); 64 } 65 66 @Override 67 public Event dispatchEvent(final Event event) { 68 if (eventDispatchers.isEmpty()) { 69 return event; 70 } 71 72 final LinkedList<EventDispatcher> tailDispatchers = 73 copyDispatchers(eventDispatchers.subList( 74 1, eventDispatchers.size())); 75 return eventDispatchers.element().dispatchEvent( 76 event, new StubEventDispatchChain(tailDispatchers)); 77 } 78 79 private static LinkedList<EventDispatcher> copyDispatchers( 80 final List<EventDispatcher> dispatchers) { 81 return new LinkedList<EventDispatcher>(dispatchers); 82 } 83 }