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 javafx.event.Event;
  29 import javafx.event.EventDispatchChain;
  30 
  31 import org.junit.Assert;
  32 
  33 public final class EventChangingDispatcher extends LabeledEventDispatcher {
  34     private final Operation capturingPhaseOperation;
  35     private final Operation bubblingPhaseOperation;
  36 
  37     public EventChangingDispatcher(final Operation capturingPhaseOperation,
  38                                    final Operation bubblingPhaseOperation) {
  39         this(null, capturingPhaseOperation, bubblingPhaseOperation);
  40     }
  41 
  42     public EventChangingDispatcher(final String label,
  43                                    final Operation capturingPhaseOperation,
  44                                    final Operation bubblingPhaseOperation) {
  45         super(label);
  46         this.capturingPhaseOperation = capturingPhaseOperation;
  47         this.bubblingPhaseOperation = bubblingPhaseOperation;
  48     }
  49 
  50     @Override
  51     public Event dispatchEvent(final Event event,
  52                                final EventDispatchChain tail) {
  53         Assert.assertTrue(event instanceof ValueEvent);
  54         ValueEvent valueEvent = (ValueEvent) event;
  55 
  56         if (capturingPhaseOperation != null) {
  57             valueEvent.setValue(capturingPhaseOperation.applyTo(
  58                                     valueEvent.getValue()));
  59         }
  60         valueEvent = (ValueEvent) tail.dispatchEvent(valueEvent);
  61         if (bubblingPhaseOperation != null) {
  62             valueEvent.setValue(bubblingPhaseOperation.applyTo(
  63                                     valueEvent.getValue()));
  64         }
  65 
  66         return valueEvent;
  67     }
  68 }