1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
|
/*******************************************************************************
* Copyright (c) 2000, 2008 IBM Corporation and others.
*
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.team.internal.ccvs.ui.model;
import java.util.HashMap;
import org.eclipse.jface.viewers.AbstractTreeViewer;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.team.internal.ccvs.core.*;
import org.eclipse.team.internal.ccvs.core.resources.RemoteFolderTree;
import org.eclipse.team.internal.ccvs.core.resources.RemoteResource;
import org.eclipse.team.internal.ccvs.ui.repo.RepositoryRoot;
import org.eclipse.ui.IWorkingSet;
import org.eclipse.ui.model.WorkbenchContentProvider;
import org.eclipse.ui.progress.DeferredTreeContentManager;
/**
* Extension to the generic workbench content provider mechanism
* to lazily determine whether an element has children. That is,
* children for an element aren't fetched until the user clicks
* on the tree expansion box.
*/
public class RemoteContentProvider extends WorkbenchContentProvider {
IWorkingSet workingSet;
DeferredTreeContentManager manager;
HashMap<ICVSRemoteFolder, RemoteFolderTree> cachedTrees;
public RemoteContentProvider(){
cachedTrees = new HashMap<>();
}
/* (non-Javadoc)
* @see org.eclipse.jface.viewers.IContentProvider#inputChanged(org.eclipse.jface.viewers.Viewer, java.lang.Object, java.lang.Object)
*/
@Override
public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
if (viewer instanceof AbstractTreeViewer) {
manager = new DeferredTreeContentManager((AbstractTreeViewer) viewer);
}
super.inputChanged(viewer, oldInput, newInput);
}
@Override
public boolean hasChildren(Object element) {
// the + box will always appear, but then disappear
// if not needed after you first click on it.
if (element instanceof ICVSRemoteResource) {
if (element instanceof ICVSRemoteFolder) {
return ((ICVSRemoteFolder) element).isExpandable();
}
return ((ICVSRemoteResource) element).isContainer();
} else if (element instanceof CVSResourceElement) {
ICVSResource r = ((CVSResourceElement) element).getCVSResource();
if (r instanceof RemoteResource) {
return r.isFolder();
}
} else if (element instanceof VersionCategory) {
return true;
} else if (element instanceof BranchCategory) {
return true;
} else if (element instanceof CVSTagElement) {
return true;
} else if (element instanceof RemoteModule) {
return true;
}
if (manager != null) {
if (manager.isDeferredAdapter(element))
return manager.mayHaveChildren(element);
}
return super.hasChildren(element);
}
/**
* Sets the workingSet.
* @param workingSet The workingSet to set
*/
public void setWorkingSet(IWorkingSet workingSet) {
this.workingSet = workingSet;
}
/**
* Returns the workingSet.
* @return IWorkingSet
*/
public IWorkingSet getWorkingSet() {
return workingSet;
}
/* (non-Javadoc)
* @see org.eclipse.ui.model.WorkbenchContentProvider#getChildren(java.lang.Object)
*/
@Override
public Object[] getChildren(Object element) {
//check to see if we already have the children cached in the tree map
Object tree = cachedTrees.get(element);
if (tree != null) {
return ((RemoteFolderTree) tree).getChildren();
}
if (manager != null) {
Object[] children = manager.getChildren(element);
if (children != null) {
// This will be a placeholder to indicate
// that the real children are being fetched
return children;
}
}
Object[] children = super.getChildren(element);
for (int i = 0; i < children.length; i++) {
Object object = children[i];
if (object instanceof CVSModelElement)
((CVSModelElement)object).setWorkingSet(getWorkingSet());
}
return children;
}
public void cancelJobs(RepositoryRoot[] roots) {
if (manager != null) {
for (int i = 0; i < roots.length; i++) {
RepositoryRoot root = roots[i];
cancelJobs(root.getRoot());
}
}
}
/**
* Cancel any jobs that are fetching content from the given location.
* @param location
*/
public void cancelJobs(ICVSRepositoryLocation location) {
if (manager != null) {
manager.cancel(location);
}
}
/**
* Adds a remote folder tree to the cache
* @param project
*
*/
public void addCachedTree(ICVSRemoteFolder project, RemoteFolderTree tree){
cachedTrees.put(project, tree);
}
public void purgeCache(){
cachedTrees.clear();
}
}
|
