Mercurial > hg > truffle
annotate visualizer/Data/src/com/sun/hotspot/igv/data/Event.java @ 13238:b429ec5c46d6
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author | Doug Simon <doug.simon@oracle.com> |
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date | Tue, 03 Dec 2013 18:19:56 +0100 |
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1 /* |
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2 * Copyright (c) 2008, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. |
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8 * |
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9 * This code is distributed in the hope that it will be useful, but WITHOUT |
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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12 * version 2 for more details (a copy is included in the LICENSE file that |
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13 * accompanied this code). |
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14 * |
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15 * You should have received a copy of the GNU General Public License version |
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16 * 2 along with this work; if not, write to the Free Software Foundation, |
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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18 * |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
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22 * |
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23 */ |
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24 package com.sun.hotspot.igv.data; |
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25 |
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26 import java.util.ArrayList; |
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27 import java.util.List; |
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28 |
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29 /** |
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30 * |
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31 * @author Thomas Wuerthinger |
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32 */ |
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33 public abstract class Event<L> { |
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34 |
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35 private List<L> listener; |
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36 private boolean fireEvents; |
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37 private boolean eventWasFired; |
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38 |
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39 public Event() { |
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40 listener = new ArrayList<>(); |
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41 fireEvents = true; |
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42 } |
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43 |
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44 public void addListener(L l) { |
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45 listener.add(l); |
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46 } |
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47 |
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48 public void addListenerAndFire(L l) { |
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49 addListener(l); |
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50 fire(l); |
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51 } |
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52 |
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53 /** |
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54 * Remove listener |
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55 * @param l |
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56 */ |
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57 public void removeListener(final L l) { |
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58 listener.remove(l); |
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59 } |
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60 |
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61 public void fire() { |
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62 if(fireEvents) { |
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63 List<L> tmpList = new ArrayList<>(listener); |
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64 for (L l : tmpList) { |
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65 fire(l); |
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66 } |
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67 } else { |
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68 eventWasFired = true; |
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69 } |
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70 } |
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71 |
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72 public void beginAtomic() { |
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73 assert fireEvents : "endAtomic has to be called before another beginAtomic may be called"; |
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74 this.fireEvents = false; |
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75 this.eventWasFired = false; |
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76 } |
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77 |
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78 public void endAtomic() { |
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79 assert !fireEvents : "beginAtomic has to be called first"; |
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80 this.fireEvents = true; |
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81 if(eventWasFired) { |
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82 fire(); |
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83 } |
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84 } |
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85 |
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86 protected abstract void fire(L l); |
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87 } |