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Java > Open Source Codes > org > eclipse > debug > internal > ui > viewers > TableUpdatePolicy


1 /*******************************************************************************
2  * Copyright (c) 2005, 2006 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  *******************************************************************************/
11 package org.eclipse.debug.internal.ui.viewers;
12
13 import org.eclipse.debug.internal.ui.viewers.model.provisional.IModelChangedListener;
14 import org.eclipse.debug.internal.ui.viewers.model.provisional.IModelDelta;
15 import org.eclipse.debug.internal.ui.viewers.model.provisional.IModelProxy;
16 import org.eclipse.jface.viewers.StructuredSelection;
17
18 /**
19  * Default update policy updates a viewer based on model deltas.
20  *
21  * @since 3.2
22  */
23 public class TableUpdatePolicy extends org.eclipse.debug.internal.ui.viewers.AbstractUpdatePolicy implements IModelChangedListener {
24
25     public void modelChanged(IModelDelta delta, IModelProxy proxy) {
26         updateNodes(new IModelDelta[] {delta});
27     }
28
29     private void handleState(IModelDelta node) {
30         AsynchronousViewer viewer = getViewer();
31         if (viewer != null) {
32             Object JavaDoc element = node.getElement();
33             viewer.update(element);
34             updateSelection(element, node.getFlags());
35         }
36     }
37     private void handleContent(IModelDelta node) {
38         AsynchronousViewer viewer = getViewer();
39         if (viewer != null) {
40             Object JavaDoc element = node.getElement();
41             viewer.refresh(element);
42             updateSelection(element, node.getFlags());
43         }
44     }
45
46     private void updateSelection(Object JavaDoc element, int flags) {
47         AsynchronousViewer viewer = getViewer();
48         if (viewer != null) {
49             if ((flags & IModelDelta.SELECT) != 0) {
50                 getViewer().setSelection(new StructuredSelection(element));
51             }
52         }
53     }
54
55     protected void updateNodes(IModelDelta[] nodes) {
56         for (int i = 0; i < nodes.length; i++) {
57             IModelDelta node = nodes[i];
58             int flags = node.getFlags();
59
60             if ((flags & IModelDelta.STATE) != 0) {
61                 handleState(node);
62             }
63             if ((flags & IModelDelta.CONTENT) != 0) {
64                 handleContent(node);
65             }
66             if ((flags & IModelDelta.ADDED) != 0) {
67                 handleAdd(node);
68             }
69             if ((flags & IModelDelta.REMOVED) != 0) {
70                 handleRemove(node);
71             }
72             if ((flags & IModelDelta.REPLACED) != 0) {
73                 handleReplace(node);
74             }
75             if ((flags & IModelDelta.INSERTED) != 0) {
76                 handleInsert(node);
77             }
78
79             IModelDelta[] childNodes = node.getChildDeltas();
80             updateNodes(childNodes);
81         }
82     }
83
84     private void handleInsert(IModelDelta node) {
85         AsynchronousTableViewer viewer = (AsynchronousTableViewer) getViewer();
86         if (viewer != null) {
87             viewer.insert(node.getElement(), node.getIndex());
88             updateSelection(node.getElement(), node.getFlags());
89         }
90     }
91
92     private void handleReplace(IModelDelta node) {
93         AsynchronousTableViewer viewer = (AsynchronousTableViewer) getViewer();
94         if (viewer != null) {
95             viewer.replace(node.getElement(), node.getReplacementElement());
96             updateSelection(node.getReplacementElement(), node.getFlags());
97         }
98     }
99
100     protected void handleAdd(IModelDelta node) {
101         ((AsynchronousTableViewer) getViewer()).add(node.getElement());
102         updateSelection(node.getElement(), node.getFlags());
103     }
104
105     protected void handleRemove(IModelDelta node) {
106         ((AsynchronousTableViewer) getViewer()).remove(node.getElement());
107     }
108 }
109
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