Mercurial > projects > dwt2
annotate org.eclipse.core.databinding.observable/src/org/eclipse/core/databinding/observable/list/ListDiff.d @ 97:c86eb8b3098e
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author | Frank Benoit <benoit@tionex.de> |
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date | Tue, 21 Apr 2009 11:18:25 +0200 |
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1 /******************************************************************************* |
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2 * Copyright (c) 2006, 2008 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 * Matthew Hall - bug 208858 |
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11 *******************************************************************************/ |
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12 |
96
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13 module org.eclipse.core.databinding.observable.list.ListDiff; |
97 | 14 import org.eclipse.core.databinding.observable.list.ListDiffEntry; |
15 import org.eclipse.core.databinding.observable.list.ListDiffVisitor; | |
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16 |
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17 import java.lang.all; |
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18 |
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19 import org.eclipse.core.internal.databinding.Util; |
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20 |
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21 /** |
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22 * Object describing a diff between two lists. |
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23 * |
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24 * @since 1.0 |
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25 */ |
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26 public abstract class ListDiff { |
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27 |
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28 /** |
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29 * Returns a ListDiffEntry array representing the differences in the list, |
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30 * in the order they are to be processed. |
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31 * |
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32 * @return a ListDiffEntry array representing the differences in the list, |
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33 * in the order they are to be processed. |
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34 */ |
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35 public abstract ListDiffEntry[] getDifferences(); |
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36 |
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37 /** |
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38 * Traverses the {@link #getDifferences()} array, calling the appropriate |
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39 * method in <code>visitor</code> for each difference. |
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40 * <ol> |
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41 * <li>{@link ListDiffVisitor#handleReplace(int, Object, Object)} is called |
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42 * whenever a remove entry is immediately followed by an add entry which |
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43 * shares the same list index. |
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44 * <li>{@link ListDiffVisitor#handleMove(int, int, Object)} is called |
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45 * whenever a remove entry is immediately followed by an add entry with an |
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46 * equivalent element. |
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47 * <li>{@link ListDiffVisitor#handleRemove(int, Object)} is called whenever |
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48 * a remove entry does not match conditions 1 or 2. |
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49 * <li>{@link ListDiffVisitor#handleAdd(int, Object)} is called whenever an |
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50 * add entry does not match conditions in 1 or 2. |
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51 * </ol> |
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52 * |
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53 * @param visitor |
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54 * the visitor to receive callbacks. |
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55 * @see ListDiffVisitor |
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56 * @since 1.1 |
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57 */ |
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58 public void accept(ListDiffVisitor visitor) { |
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59 ListDiffEntry[] differences = getDifferences(); |
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60 for (int i = 0; i < differences.length; i++) { |
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61 ListDiffEntry entry = differences[i]; |
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62 int position = entry.getPosition(); |
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63 Object element = entry.getElement(); |
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64 bool addition = entry.isAddition(); |
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65 |
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66 if (!addition && i + 1 < differences.length) { |
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67 ListDiffEntry entry2 = differences[i + 1]; |
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68 if (entry2.isAddition()) { |
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69 int position2 = entry2.getPosition(); |
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70 Object element2 = entry2.getElement(); |
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71 if (position is position2) { |
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72 visitor.handleReplace(position, element, element2); |
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73 i++; |
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74 continue; |
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75 } |
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76 if (Util.equals(element, element2)) { |
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77 visitor.handleMove(position, position2, element); |
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78 i++; |
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79 continue; |
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80 } |
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81 } |
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82 } |
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83 if (addition) |
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84 visitor.handleAdd(position, element); |
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85 else |
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86 visitor.handleRemove(position, element); |
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87 } |
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88 } |
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89 |
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90 /** |
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91 * @see java.lang.Object#toString() |
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92 */ |
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93 public String toString() { |
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94 ListDiffEntry[] differences = getDifferences(); |
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95 StringBuffer buffer = new StringBuffer(); |
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96 buffer.append(getClass().getName()); |
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97 |
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98 if (differences is null || differences.length is 0) { |
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99 buffer |
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100 .append("{}"); //$NON-NLS-1$ |
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101 } else { |
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102 buffer |
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103 .append("{"); //$NON-NLS-1$ |
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104 |
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105 for (int i = 0; i < differences.length; i++) { |
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106 if (i > 0) |
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107 buffer.append(", "); //$NON-NLS-1$ |
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108 |
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109 buffer |
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110 .append("difference[") //$NON-NLS-1$ |
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111 .append(i) |
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112 .append("] [") //$NON-NLS-1$ |
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113 .append(differences[i] !is null ? differences[i].toString() : "null") //$NON-NLS-1$ |
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114 .append("]"); //$NON-NLS-1$ |
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115 } |
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116 buffer.append("}"); //$NON-NLS-1$ |
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117 } |
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118 |
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119 return buffer.toString(); |
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120 } |
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121 } |