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
|
/*
* Copyright 2000-2009 JetBrains s.r.o.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.intellij.usages.impl;
import com.intellij.openapi.util.Comparing;
import com.intellij.usages.UsageView;
import org.intellij.lang.annotations.MagicConstant;
import org.jetbrains.annotations.NotNull;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeModel;
/**
* @author max
*/
public abstract class Node extends DefaultMutableTreeNode {
protected final DefaultTreeModel myTreeModel;
private String myCachedText;
private byte myCachedFlags; // bit packed flags below:
private static final int INVALID_FLAG = 0;
private static final int READ_ONLY_FLAG = 1;
private static final int READ_ONLY_COMPUTED_FLAG = 2;
private static final int EXCLUDED_FLAG = 3;
private static final int UPDATED_FLAG = 4;
@MagicConstant(intValues = {INVALID_FLAG, READ_ONLY_FLAG, READ_ONLY_COMPUTED_FLAG, EXCLUDED_FLAG, UPDATED_FLAG})
@interface FlagConstant {}
private boolean isFlagSet(@FlagConstant int flag) {
int state = myCachedFlags >> flag;
return (state & 1) != 0;
}
private void setFlag(@FlagConstant int flag, boolean value) {
int state = value ? 1 : 0;
myCachedFlags = (byte)(myCachedFlags & ~(1 << flag) | state << flag);
}
protected Node(@NotNull DefaultTreeModel model) {
myTreeModel = model;
}
/**
* debug method for producing string tree presentation
*/
public abstract String tree2string(int indent, String lineSeparator);
/**
* isDataXXX methods perform actual (expensive) data computation.
* Called from {@link #update(com.intellij.usages.UsageView)})
* to be compared later with cached data stored in {@link #myCachedFlags} and {@link #myCachedText}
*/
protected abstract boolean isDataValid();
protected abstract boolean isDataReadOnly();
protected abstract boolean isDataExcluded();
protected abstract String getText(@NotNull UsageView view);
public final boolean isValid() {
return !isFlagSet(INVALID_FLAG);
}
public final boolean isReadOnly() {
boolean result;
boolean computed = isFlagSet(READ_ONLY_COMPUTED_FLAG);
if (computed) {
result = isFlagSet(READ_ONLY_FLAG);
}
else {
result = isDataReadOnly();
setFlag(READ_ONLY_COMPUTED_FLAG, true);
setFlag(READ_ONLY_FLAG, result);
}
return result;
}
public final boolean isExcluded() {
return isFlagSet(EXCLUDED_FLAG);
}
public final void update(@NotNull UsageView view) {
boolean isDataValid = isDataValid();
boolean isReadOnly = isDataReadOnly();
boolean isExcluded = isDataExcluded();
String text = getText(view);
boolean cachedValid = isValid();
boolean cachedReadOnly = isFlagSet(READ_ONLY_FLAG);
boolean cachedExcluded = isFlagSet(EXCLUDED_FLAG);
if (isDataValid != cachedValid || isReadOnly != cachedReadOnly || isExcluded != cachedExcluded || !Comparing.equal(myCachedText, text)) {
setFlag(INVALID_FLAG, !isDataValid);
setFlag(READ_ONLY_FLAG, isReadOnly);
setFlag(EXCLUDED_FLAG, isExcluded);
myCachedText = text;
updateNotify();
myTreeModel.nodeChanged(this);
}
setFlag(UPDATED_FLAG, true);
}
public void markNeedUpdate() {
setFlag(UPDATED_FLAG, false);
}
public boolean needsUpdate() {
return !isFlagSet(UPDATED_FLAG);
}
/**
* Override to perform node-specific updates
*/
protected void updateNotify() {
}
}
|
