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1
11 package org.eclipse.debug.internal.ui.viewers.model;
12
13 import org.eclipse.debug.internal.ui.viewers.model.provisional.IChildrenUpdate;
14 import org.eclipse.debug.internal.ui.viewers.model.provisional.IElementContentProvider;
15 import org.eclipse.debug.internal.ui.viewers.model.provisional.IPresentationContext;
16 import org.eclipse.jface.viewers.TreePath;
17
18
23 public class ChildrenUpdate extends ViewerUpdateMonitor implements IChildrenUpdate {
24
25 private Object  [] fElements;
26 private int fIndex;
27 private int fLength;
28
29
35 public ChildrenUpdate(ModelContentProvider provider, TreePath elementPath, Object element, int index, IElementContentProvider elementContentProvider, IPresentationContext context) {
36 super(provider, elementPath, element, elementContentProvider, context);
37 fIndex = index;
38 fLength = 1;
39 }
40
41
46 protected void performUpdate() {
47 TreeModelContentProvider provider = (TreeModelContentProvider) getContentProvider();
48 TreePath elementPath = getElementPath();
49 if (fElements != null) {
50 InternalTreeModelViewer viewer = (InternalTreeModelViewer) provider.getViewer();
51 for (int i = 0; i < fElements.length; i++) {
52 int modelIndex = fIndex + i;
53 Object element = fElements[i];
54 if (element != null) {
55 int viewIndex = provider.modelToViewIndex(elementPath, modelIndex);
56 if (provider.shouldFilter(elementPath, element)) {
57 if (provider.addFilteredIndex(elementPath, modelIndex, element)) {
58 if (ModelContentProvider.DEBUG_CONTENT_PROVIDER) {
59 System.out.println("REMOVE(" + getElement() + ", modelIndex: " + modelIndex + " viewIndex: " + viewIndex + ", " + element + ")"); }
61 viewer.remove(elementPath, viewIndex);
62 }
63 } else {
64 if (provider.isFiltered(elementPath, modelIndex)) {
65 provider.clearFilteredChild(elementPath, modelIndex);
66 int insertIndex = provider.modelToViewIndex(elementPath, modelIndex);
67 if (ModelContentProvider.DEBUG_CONTENT_PROVIDER) {
68 System.out.println("insert(" + getElement() + ", modelIndex: " + modelIndex + " insertIndex: " + insertIndex + ", " + element + ")"); }
70 viewer.insert(elementPath, element, insertIndex);
71 } else {
72 if (ModelContentProvider.DEBUG_CONTENT_PROVIDER) {
73 System.out.println("replace(" + getElement() + ", modelIndex: " + modelIndex + " viewIndex: " + viewIndex + ", " + element + ")"); }
75 viewer.replace(elementPath, viewIndex, element);
76 }
77 TreePath childPath = elementPath.createChildPath(element);
78 provider.updateHasChildren(childPath);
79 }
80 }
81 }
82 } else {
83 provider.updateHasChildren(elementPath);
84 }
85 }
86
87
90 public void setChild(Object child, int index) {
91 if (fElements == null) {
92 fElements = new Object [fLength];
93 }
94 fElements[index - fIndex] = child;
95 }
96
97
103 public synchronized boolean coalesce(ViewerUpdateMonitor request) {
104 if (request instanceof ChildrenUpdate) {
105 ChildrenUpdate cu = (ChildrenUpdate) request;
106 if (getElement().equals(cu.getElement()) && getElementPath().equals(cu.getElementPath())) {
107 int end = fIndex + fLength;
108 int otherStart = cu.getOffset();
109 int otherEnd = otherStart + cu.getLength();
110 if ((otherStart >= fIndex && otherStart <= end) || (otherEnd >= fIndex && otherEnd <= end)) {
111 fIndex = Math.min(fIndex, otherStart);
113 end = Math.max(end, otherEnd);
114 fLength = end - fIndex;
115 if (ModelContentProvider.DEBUG_CONTENT_PROVIDER) {
116 System.out.println("coalesced: " + this.toString()); }
118 return true;
119 }
120 }
121 }
122 return false;
123 }
124
125
128 public int getLength() {
129 return fLength;
130 }
131
132
135 public int getOffset() {
136 return fIndex;
137 }
138
139
142 void startRequest() {
143 getElementContentProvider().update(new IChildrenUpdate[]{this});
144 }
145
146 public String toString() {
147 StringBuffer buf = new StringBuffer ();
148 buf.append("IChildrenUpdate: "); buf.append(getElement());
150 buf.append(" {"); buf.append(getOffset());
152 buf.append(',');
153 buf.append(getLength());
154 buf.append("}"); return buf.toString();
156 }
157
158
161 int getPriority() {
162 return 3;
163 }
164
165
168 TreePath getSchedulingPath() {
169 return getElementPath();
170 }
171
172
178 void setOffset(int offset) {
179 fIndex = offset;
180 }
181 }
182
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