Mercurial > projects > dwt2
annotate org.eclipse.core.databinding/src/org/eclipse/core/databinding/observable/list/ListDiff.d @ 88:9e0ab372d5d8
Revert from TypeInfo/ClassInfo to java.lang.Class
author | Frank Benoit <benoit@tionex.de> |
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date | Sun, 19 Apr 2009 11:10:09 +0200 |
parents | 6be48cf9f95c |
children |
rev | line source |
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78 | 1 /******************************************************************************* |
2 * Copyright (c) 2006, 2008 IBM Corporation and others. | |
3 * All rights reserved. This program and the accompanying materials | |
4 * are made available under the terms of the Eclipse Public License v1.0 | |
5 * which accompanies this distribution, and is available at | |
6 * http://www.eclipse.org/legal/epl-v10.html | |
7 * | |
8 * Contributors: | |
9 * IBM Corporation - initial API and implementation | |
10 * Matthew Hall - bug 208858 | |
11 *******************************************************************************/ | |
12 | |
13 module org.eclipse.core.databinding.observable.list.ListDiff; | |
81 | 14 import org.eclipse.core.databinding.observable.list.ListDiffEntry; |
15 import org.eclipse.core.databinding.observable.list.ListDiffVisitor; | |
78 | 16 |
17 import java.lang.all; | |
18 | |
19 import org.eclipse.core.internal.databinding.Util; | |
20 | |
21 /** | |
22 * Object describing a diff between two lists. | |
23 * | |
24 * @since 1.0 | |
25 */ | |
26 public abstract class ListDiff { | |
27 | |
28 /** | |
29 * Returns a ListDiffEntry array representing the differences in the list, | |
30 * in the order they are to be processed. | |
31 * | |
32 * @return a ListDiffEntry array representing the differences in the list, | |
33 * in the order they are to be processed. | |
34 */ | |
35 public abstract ListDiffEntry[] getDifferences(); | |
36 | |
37 /** | |
38 * Traverses the {@link #getDifferences()} array, calling the appropriate | |
39 * method in <code>visitor</code> for each difference. | |
40 * <ol> | |
41 * <li>{@link ListDiffVisitor#handleReplace(int, Object, Object)} is called | |
42 * whenever a remove entry is immediately followed by an add entry which | |
43 * shares the same list index. | |
44 * <li>{@link ListDiffVisitor#handleMove(int, int, Object)} is called | |
45 * whenever a remove entry is immediately followed by an add entry with an | |
46 * equivalent element. | |
47 * <li>{@link ListDiffVisitor#handleRemove(int, Object)} is called whenever | |
48 * a remove entry does not match conditions 1 or 2. | |
49 * <li>{@link ListDiffVisitor#handleAdd(int, Object)} is called whenever an | |
50 * add entry does not match conditions in 1 or 2. | |
51 * </ol> | |
52 * | |
53 * @param visitor | |
54 * the visitor to receive callbacks. | |
55 * @see ListDiffVisitor | |
56 * @since 1.1 | |
57 */ | |
58 public void accept(ListDiffVisitor visitor) { | |
59 ListDiffEntry[] differences = getDifferences(); | |
60 for (int i = 0; i < differences.length; i++) { | |
61 ListDiffEntry entry = differences[i]; | |
62 int position = entry.getPosition(); | |
63 Object element = entry.getElement(); | |
64 bool addition = entry.isAddition(); | |
65 | |
66 if (!addition && i + 1 < differences.length) { | |
67 ListDiffEntry entry2 = differences[i + 1]; | |
68 if (entry2.isAddition()) { | |
69 int position2 = entry2.getPosition(); | |
70 Object element2 = entry2.getElement(); | |
71 if (position is position2) { | |
72 visitor.handleReplace(position, element, element2); | |
73 i++; | |
74 continue; | |
75 } | |
76 if (Util.equals(element, element2)) { | |
77 visitor.handleMove(position, position2, element); | |
78 i++; | |
79 continue; | |
80 } | |
81 } | |
82 } | |
83 if (addition) | |
84 visitor.handleAdd(position, element); | |
85 else | |
86 visitor.handleRemove(position, element); | |
87 } | |
88 } | |
89 | |
90 /** | |
91 * @see java.lang.Object#toString() | |
92 */ | |
93 public String toString() { | |
94 ListDiffEntry[] differences = getDifferences(); | |
95 StringBuffer buffer = new StringBuffer(); | |
88
9e0ab372d5d8
Revert from TypeInfo/ClassInfo to java.lang.Class
Frank Benoit <benoit@tionex.de>
parents:
85
diff
changeset
|
96 buffer.append(Class.fromObject(this).getName()); |
78 | 97 |
98 if (differences is null || differences.length is 0) { | |
99 buffer | |
100 .append("{}"); //$NON-NLS-1$ | |
101 } else { | |
102 buffer | |
103 .append("{"); //$NON-NLS-1$ | |
104 | |
105 for (int i = 0; i < differences.length; i++) { | |
106 if (i > 0) | |
107 buffer.append(", "); //$NON-NLS-1$ | |
108 | |
109 buffer | |
110 .append("difference[") //$NON-NLS-1$ | |
111 .append(i) | |
112 .append("] [") //$NON-NLS-1$ | |
113 .append(differences[i] !is null ? differences[i].toString() : "null") //$NON-NLS-1$ | |
114 .append("]"); //$NON-NLS-1$ | |
115 } | |
116 buffer.append("}"); //$NON-NLS-1$ | |
117 } | |
118 | |
119 return buffer.toString(); | |
120 } | |
121 } |