|
78
|
1 /*******************************************************************************
|
|
|
2 * Copyright (c) 2007 Matthew Hall 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 * Matthew Hall - initial API and implementation (bug 208858)
|
|
|
10 ******************************************************************************/
|
|
|
11
|
|
|
12 module org.eclipse.core.databinding.observable.list.ListDiffVisitor;
|
|
|
13
|
|
|
14 import java.lang.all;
|
|
|
15
|
|
|
16 import java.util.List;
|
|
|
17
|
|
|
18 /**
|
|
|
19 * A visitor for processing differences in a ListDiff.
|
|
|
20 *
|
|
|
21 * @see ListDiff#acceptcast(ListDiffVisitor)
|
|
|
22 * @since 1.1
|
|
|
23 */
|
|
|
24 public abstract class ListDiffVisitor {
|
|
|
25 /**
|
|
|
26 * Notifies the visitor that <code>element</code> was added to the list at
|
|
|
27 * position <code>index</code>.
|
|
|
28 *
|
|
|
29 * @param index
|
|
|
30 * the index where the element was added
|
|
|
31 * @param element
|
|
|
32 * the element that was added
|
|
|
33 */
|
|
|
34 public abstract void handleAdd(int index, Object element);
|
|
|
35
|
|
|
36 /**
|
|
|
37 * Notifies the visitor that <code>element</code> was removed from the
|
|
|
38 * list at position <code>index</code>.
|
|
|
39 *
|
|
|
40 * @param index
|
|
|
41 * the index where the element was removed
|
|
|
42 * @param element
|
|
|
43 * the element that was removed
|
|
|
44 */
|
|
|
45 public abstract void handleRemove(int index, Object element);
|
|
|
46
|
|
|
47 /**
|
|
|
48 * Notifies the visitor that <code>element</code> was moved in the list
|
|
|
49 * from position <code>oldIndex</code> to position <code>newIndex</code>.
|
|
|
50 * <p>
|
|
|
51 * The default implementation of this method calls
|
|
|
52 * {@link #handleRemove(int, Object)} with the old position, then
|
|
|
53 * {@link #handleAdd(int, Object)} with the new position. Clients which are
|
|
|
54 * interested in recognizing "moves" in a list (i.e. calls to
|
|
|
55 * {@link IObservableList#move(int, int)}) should override this method.
|
|
|
56 *
|
|
|
57 * @param oldIndex
|
|
|
58 * the index that the element was moved from.
|
|
|
59 * @param newIndex
|
|
|
60 * the index that the element was moved to.
|
|
|
61 * @param element
|
|
|
62 * the element that was moved
|
|
|
63 * @see IObservableList#move(int, int)
|
|
|
64 */
|
|
|
65 public void handleMove(int oldIndex, int newIndex, Object element) {
|
|
|
66 handleRemove(oldIndex, element);
|
|
|
67 handleAdd(newIndex, element);
|
|
|
68 }
|
|
|
69
|
|
|
70 /**
|
|
|
71 * Notifies the visitor that <code>oldElement</code>, located at position
|
|
|
72 * <code>index</code> in the list, was replaced by <code>newElement</code>.
|
|
|
73 * <p>
|
|
|
74 * The default implementation of this method calls
|
|
|
75 * {@link #handleRemove(int, Object)} with the old element, then
|
|
|
76 * {@link #handleAdd(int, Object)} with the new element. Clients which are
|
|
|
77 * interested in recognizing "replaces" in a list (i.e. calls to
|
|
|
78 * {@link List#set(int, Object)}) should override this method.
|
|
|
79 *
|
|
|
80 * @param index
|
|
|
81 * the index where the element was replaced.
|
|
|
82 * @param oldElement
|
|
|
83 * the element being replaced.
|
|
|
84 * @param newElement
|
|
|
85 * the element that replaced oldElement.
|
|
|
86 * @see List#set(int, Object)
|
|
|
87 */
|
|
|
88 public void handleReplace(int index, Object oldElement, Object newElement) {
|
|
|
89 handleRemove(index, oldElement);
|
|
|
90 handleAdd(index, newElement);
|
|
|
91 }
|
|
|
92 }
|
