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annotate org.eclipse.draw2d/src/org/eclipse/draw2d/EventListenerList.d @ 16:dbfb303e8fb0

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first complete successful compile (win-only)
author Frank Benoit <benoit@tionex.de>
date Wed, 18 Mar 2009 08:56:47 +0100
parents bc29606a740c
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1 /*******************************************************************************
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2 * Copyright (c) 2000, 2005 IBM Corporation and others.
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3 * All rights reserved. This program and the accompanying materials
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4 * are made available under the terms of the Eclipse Public License v1.0
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5 * which accompanies this distribution, and is available at
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6 * http://www.eclipse.org/legal/epl-v10.html
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7 *
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8 * Contributors:
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9 * IBM Corporation - initial API and implementation
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10 * Port to the D programming language:
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11 * Frank Benoit <benoit@tionex.de>
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12 *******************************************************************************/
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13 module org.eclipse.draw2d.EventListenerList;
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14
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15 import java.lang.all;
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16 import java.util.Iterator;
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19 /**
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20 * This class is intended for internal use only.
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21 * TODO: If this is for internal use only, we should move it to the internal package.
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22 */
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23 public final class EventListenerList {
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25 private /+volatile+/ Object array[];
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27 /**
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28 * Adds a listener of type <i>c</i> to the list.
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29 * @param c the class
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30 * @param listener the listener
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31 */
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32 public synchronized void addListener(ClassInfo c, Object listener) {
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33 if (listener is null || c is null)
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34 throw new IllegalArgumentException("");
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35
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36 int oldSize = (array is null) ? 0 : array.length;
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37 Object[] newArray = new Object[oldSize + 2];
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38 if (oldSize !is 0)
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39 System.arraycopy(array, 0, newArray, 0, oldSize);
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40 newArray[oldSize++] = c;
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41 newArray[oldSize] = listener;
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42 array = newArray;
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43 }
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44
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45 /**
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46 * Returns <code>true</code> if this list of listeners contains a listener of type
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47 * <i>c</i>.
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48 * @param c the type
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49 * @return whether this list contains a listener of type <i>c</i>
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50 */
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51 public synchronized bool containsListener(ClassInfo c) {
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52 if (array is null)
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53 return false;
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54 for (int i = 0; i < array.length; i += 2)
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55 if (array[i] is c)
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56 return true;
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57 return false;
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58 }
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59
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60 static class TypeIterator : Iterator {
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61 private final Object[] items;
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62 private final ClassInfo type;
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63 private int index;
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64 this(Object items[], ClassInfo type) {
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65 this.items = items;
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66 this.type = type;
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67 }
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68 public Object next() {
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69 Object result = items[index + 1];
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70 index += 2;
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71 return result;
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72 }
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73
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74 public bool hasNext() {
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75 if (items is null)
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76 return false;
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77 while (index < items.length && items[index] !is type)
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78 index += 2;
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79 return index < items.length;
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80 }
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81
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82 public void remove() {
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83 throw new UnsupportedOperationException("Iterator removal not supported"); //$NON-NLS-1$
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84 }
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85 }
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86
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87 /**
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88 * Returns an Iterator of all the listeners of type <i>c</i>.
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89 * @param listenerType the type
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90 * @return an Iterator of all the listeners of type <i>c</i>
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91 */
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92 public synchronized Iterator getListeners(ClassInfo listenerType) {
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93 return new TypeIterator(array, listenerType);
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94 }
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95
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96 /**
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97 * Removes the first <i>listener</i> of the specified type by identity.
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98 * @param c the type
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99 * @param listener the listener
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100 */
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101 public synchronized void removeListener(ClassInfo c, Object listener) {
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102 if (array is null || array.length is 0)
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103 return;
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104 if (listener is null || c is null)
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105 throw new IllegalArgumentException("");
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106
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107 int index = 0;
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108 while (index < array.length) {
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109 if (array[index] is c && array[index + 1] is listener)
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110 break;
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111 index += 2;
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112 }
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113 if (index is array.length)
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114 return; //listener was not found
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115
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116 Object newArray[] = new Object[array.length - 2];
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117 System.arraycopy(array, 0, newArray, 0, index);
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118 System.arraycopy(array, index + 2, newArray, index, array.length - index - 2);
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119 array = newArray;
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120 }
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121
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122 }